* [syzbot] [dri?] WARNING in drm_mm_takedown
@ 2026-07-29 2:08 syzbot
2026-08-09 20:57 ` syzbot
0 siblings, 1 reply; 10+ messages in thread
From: syzbot @ 2026-07-29 2:08 UTC (permalink / raw)
To: airlied, dri-devel, linux-kernel, maarten.lankhorst, mripard,
simona, syzkaller-bugs, tzimmermann
Hello,
syzbot found the following issue on:
HEAD commit: 62cc90241548 Merge tag 'mm-hotfixes-stable-2026-07-27-14-1..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=121f9632580000
kernel config: https://syzkaller.appspot.com/x/.config?x=145fa60d73086782
dashboard link: https://syzkaller.appspot.com/bug?extid=d93b9064fe5f74af3aa3
compiler: gcc (Debian 14.2.0-19) 14.2.0, GNU ld (GNU Binutils for Debian) 2.44
Unfortunately, I don't have any reproducer for this issue yet.
Downloadable assets:
disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/d900f083ada3/non_bootable_disk-62cc9024.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/b10a9ae7e3d1/vmlinux-62cc9024.xz
kernel image: https://storage.googleapis.com/syzbot-assets/b89124d39495/bzImage-62cc9024.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+d93b9064fe5f74af3aa3@syzkaller.appspotmail.com
------------[ cut here ]------------
Memory manager not clean during takedown.
WARNING: drivers/gpu/drm/drm_mm.c:965 at drm_mm_takedown+0x62/0x280 drivers/gpu/drm/drm_mm.c:965, CPU#3: syz.1.134/6649
Modules linked in:
CPU: 3 UID: 0 PID: 6649 Comm: syz.1.134 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
RIP: 0010:drm_mm_takedown+0x62/0x280 drivers/gpu/drm/drm_mm.c:965
Code: 8b 43 38 48 39 c5 75 16 e8 2b c6 44 fc 48 83 c4 08 5b 5d 41 5c 41 5d 41 5e c3 cc cc cc cc e8 15 c6 44 fc 48 8d 3d ce 75 68 0b <67> 48 0f b9 3a 48 c7 c0 e0 e3 46 8e 48 ba 00 00 00 00 00 fc ff df
RSP: 0018:ffffc9000383f858 EFLAGS: 00010283
RAX: 0000000000021ab5 RBX: ffff888027c40c68 RCX: ffffc90007884000
RDX: 0000000000080000 RSI: ffffffff85c59a2b RDI: ffffffff912e1000
RBP: ffff888027c40ca0 R08: 0000000000000007 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffff8880277dbd80
R13: ffff8880277dbd98 R14: ffffffff85c47730 R15: 0000000000000000
FS: 00007fd2ebde36c0(0000) GS:ffff8880d60dc000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fa5b75eb580 CR3: 0000000025294000 CR4: 0000000000352ef0
Call Trace:
<TASK>
drm_managed_release+0x1bb/0x540 drivers/gpu/drm/drm_managed.c:75
drm_dev_release drivers/gpu/drm/drm_drv.c:914 [inline]
kref_put include/linux/kref.h:65 [inline]
drm_dev_put.part.0+0xca/0x140 drivers/gpu/drm/drm_drv.c:948
drm_dev_put+0x1f/0x30 drivers/gpu/drm/drm_drv.c:947
virtio_dev_remove+0xb8/0x170 drivers/virtio/virtio.c:375
device_remove+0xcb/0x180 drivers/base/dd.c:616
__device_release_driver drivers/base/dd.c:1349 [inline]
device_release_driver_internal+0x44e/0x620 drivers/base/dd.c:1372
bus_remove_device+0x2bc/0x560 drivers/base/bus.c:664
device_del+0x376/0x9b0 drivers/base/core.c:3961
device_unregister+0x1d/0xe0 drivers/base/core.c:4002
unregister_virtio_device+0x39/0x60 drivers/virtio/virtio.c:594
virtio_pci_remove+0x7c/0x110 drivers/virtio/virtio_pci_common.c:758
pci_device_remove+0xb2/0x1d0 drivers/pci/pci-driver.c:512
device_remove+0xcb/0x180 drivers/base/dd.c:616
__device_release_driver drivers/base/dd.c:1349 [inline]
device_release_driver_internal+0x44e/0x620 drivers/base/dd.c:1372
unbind_store+0xf8/0x110 drivers/base/bus.c:244
drv_attr_store+0x74/0xb0 drivers/base/bus.c:125
sysfs_kf_write+0xf2/0x150 fs/sysfs/file.c:145
kernfs_fop_write_iter+0x3e0/0x5f0 fs/kernfs/file.c:345
new_sync_write fs/read_write.c:595 [inline]
vfs_write+0x6ac/0x1050 fs/read_write.c:687
ksys_write+0x12a/0x250 fs/read_write.c:739
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x115/0x870 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fd2eaf9de99
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fd2ebde3028 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007fd2eb225fa0 RCX: 00007fd2eaf9de99
RDX: 000000000000000d RSI: 0000200000000280 RDI: 0000000000000008
RBP: 00007fd2eb033eaf R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fd2eb226038 R14: 00007fd2eb225fa0 R15: 00007ffd8ff0ecc8
</TASK>
----------------
Code disassembly (best guess):
0: 8b 43 38 mov 0x38(%rbx),%eax
3: 48 39 c5 cmp %rax,%rbp
6: 75 16 jne 0x1e
8: e8 2b c6 44 fc call 0xfc44c638
d: 48 83 c4 08 add $0x8,%rsp
11: 5b pop %rbx
12: 5d pop %rbp
13: 41 5c pop %r12
15: 41 5d pop %r13
17: 41 5e pop %r14
19: c3 ret
1a: cc int3
1b: cc int3
1c: cc int3
1d: cc int3
1e: e8 15 c6 44 fc call 0xfc44c638
23: 48 8d 3d ce 75 68 0b lea 0xb6875ce(%rip),%rdi # 0xb6875f8
* 2a: 67 48 0f b9 3a ud1 (%edx),%rdi <-- trapping instruction
2f: 48 c7 c0 e0 e3 46 8e mov $0xffffffff8e46e3e0,%rax
36: 48 ba 00 00 00 00 00 movabs $0xdffffc0000000000,%rdx
3d: fc ff df
---
This report is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzkaller@googlegroups.com.
syzbot will keep track of this issue. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
If the report is already addressed, let syzbot know by replying with:
#syz fix: exact-commit-title
If you want to overwrite report's subsystems, reply with:
#syz set subsystems: new-subsystem
(See the list of subsystem names on the web dashboard)
If the report is a duplicate of another one, reply with:
#syz dup: exact-subject-of-another-report
If you want to undo deduplication, reply with:
#syz undup
^ permalink raw reply [flat|nested] 10+ messages in thread
* Re: [syzbot] [dri?] WARNING in drm_mm_takedown
2026-07-29 2:08 syzbot
@ 2026-08-09 20:57 ` syzbot
0 siblings, 0 replies; 10+ messages in thread
From: syzbot @ 2026-08-09 20:57 UTC (permalink / raw)
To: airlied, dri-devel, linux-kernel, maarten.lankhorst, mripard,
simona, syzkaller-bugs, tzimmermann
syzbot has found a reproducer for the following issue on:
HEAD commit: b643e495ae92 Merge tag 's390-7.2-7' of git://git.kernel.or..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=1531a2c6580000
kernel config: https://syzkaller.appspot.com/x/.config?x=c44651ea7dd2f307
dashboard link: https://syzkaller.appspot.com/bug?extid=d93b9064fe5f74af3aa3
compiler: gcc (Debian 14.2.0-19) 14.2.0, GNU ld (GNU Binutils for Debian) 2.44
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=138cdfb9580000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1373ffb9580000
Downloadable assets:
disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/d900f083ada3/non_bootable_disk-b643e495.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/9eb4fbda136d/vmlinux-b643e495.xz
kernel image: https://storage.googleapis.com/syzbot-assets/53cbbd75c40a/bzImage-b643e495.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+d93b9064fe5f74af3aa3@syzkaller.appspotmail.com
Console: switching to colour dummy device 80x25
------------[ cut here ]------------
Memory manager not clean during takedown.
WARNING: drivers/gpu/drm/drm_mm.c:965 at drm_mm_takedown+0x62/0x280 drivers/gpu/drm/drm_mm.c:965, CPU#0: syz.0.28/5943
Modules linked in:
CPU: 0 UID: 0 PID: 5943 Comm: syz.0.28 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
RIP: 0010:drm_mm_takedown+0x62/0x280 drivers/gpu/drm/drm_mm.c:965
Code: 8b 43 38 48 39 c5 75 16 e8 3b 0e 45 fc 48 83 c4 08 5b 5d 41 5c 41 5d 41 5e e9 0a 9f f8 05 e8 25 0e 45 fc 48 8d 3d 2e cb 67 0b <67> 48 0f b9 3a 48 c7 c0 e0 13 47 8e 48 ba 00 00 00 00 00 fc ff df
RSP: 0018:ffffc90003aff790 EFLAGS: 00010293
RAX: 0000000000000000 RBX: ffff88802b8a0c68 RCX: ffffffff85c5509b
RDX: ffff888030942540 RSI: ffffffff85c5655b RDI: ffffffff912d3090
RBP: ffff88802b8a0ca0 R08: 0000000000000007 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffff888029bdb900
R13: ffff888029bdb918 R14: ffffffff85c44260 R15: 0000000000000000
FS: 000055557bc5c500(0000) GS:ffff8880d5dec000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00001c245591d000 CR3: 0000000038e44000 CR4: 0000000000352ef0
Call Trace:
<TASK>
drm_managed_release+0x1bb/0x540 drivers/gpu/drm/drm_managed.c:75
drm_dev_release drivers/gpu/drm/drm_drv.c:914 [inline]
kref_put include/linux/kref.h:65 [inline]
drm_dev_put.part.0+0xca/0x140 drivers/gpu/drm/drm_drv.c:948
drm_dev_put+0x1f/0x30 drivers/gpu/drm/drm_drv.c:947
virtio_dev_remove+0xb8/0x170 drivers/virtio/virtio.c:375
device_remove+0xcb/0x180 drivers/base/dd.c:616
__device_release_driver drivers/base/dd.c:1349 [inline]
device_release_driver_internal+0x44e/0x620 drivers/base/dd.c:1372
bus_remove_device+0x2bc/0x560 drivers/base/bus.c:664
device_del+0x376/0x9b0 drivers/base/core.c:3961
device_unregister+0x1d/0xe0 drivers/base/core.c:4002
unregister_virtio_device+0x39/0x60 drivers/virtio/virtio.c:594
virtio_pci_remove+0x7c/0x110 drivers/virtio/virtio_pci_common.c:758
pci_device_remove+0xb2/0x1d0 drivers/pci/pci-driver.c:512
device_remove+0xcb/0x180 drivers/base/dd.c:616
__device_release_driver drivers/base/dd.c:1349 [inline]
device_release_driver_internal+0x44e/0x620 drivers/base/dd.c:1372
pci_stop_dev drivers/pci/remove.c:27 [inline]
pci_stop_bus_device+0x120/0x160 drivers/pci/remove.c:93
pci_stop_and_remove_bus_device+0x58/0xa0 drivers/pci/remove.c:128
pci_stop_and_remove_bus_device_locked+0x1a/0x20 drivers/pci/remove.c:136
remove_store+0x123/0x140 drivers/pci/pci-sysfs.c:523
dev_attr_store+0x58/0x80 drivers/base/core.c:2505
sysfs_kf_write+0xf2/0x150 fs/sysfs/file.c:145
kernfs_fop_write_iter+0x3e0/0x5f0 fs/kernfs/file.c:345
new_sync_write fs/read_write.c:595 [inline]
vfs_write+0x6ac/0x1050 fs/read_write.c:687
ksys_write+0x12a/0x250 fs/read_write.c:739
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x115/0x870 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fa232f9e0d9
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffd4f8ff7c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007fa233225fa0 RCX: 00007fa232f9e0d9
RDX: 0000000000000001 RSI: 00002000000000c0 RDI: 0000000000000003
RBP: 00007fa233035024 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fa233225fac R14: 00007fa233225fa0 R15: 00007fa233225fa0
</TASK>
----------------
Code disassembly (best guess):
0: 8b 43 38 mov 0x38(%rbx),%eax
3: 48 39 c5 cmp %rax,%rbp
6: 75 16 jne 0x1e
8: e8 3b 0e 45 fc call 0xfc450e48
d: 48 83 c4 08 add $0x8,%rsp
11: 5b pop %rbx
12: 5d pop %rbp
13: 41 5c pop %r12
15: 41 5d pop %r13
17: 41 5e pop %r14
19: e9 0a 9f f8 05 jmp 0x5f89f28
1e: e8 25 0e 45 fc call 0xfc450e48
23: 48 8d 3d 2e cb 67 0b lea 0xb67cb2e(%rip),%rdi # 0xb67cb58
* 2a: 67 48 0f b9 3a ud1 (%edx),%rdi <-- trapping instruction
2f: 48 c7 c0 e0 13 47 8e mov $0xffffffff8e4713e0,%rax
36: 48 ba 00 00 00 00 00 movabs $0xdffffc0000000000,%rdx
3d: fc ff df
---
If you want syzbot to run the reproducer, reply with:
#syz test: git://repo/address.git branch-or-commit-hash
If you attach or paste a git patch, syzbot will apply it before testing.
^ permalink raw reply [flat|nested] 10+ messages in thread
* Re: [syzbot] [dri?] WARNING in drm_mm_takedown
[not found] <0c1bf590-3b29-4bd9-a0a9-b133bd234cf3n@googlegroups.com>
@ 2026-08-24 6:36 ` syzbot
0 siblings, 0 replies; 10+ messages in thread
From: syzbot @ 2026-08-24 6:36 UTC (permalink / raw)
To: linux-kernel, syzkaller-bugs, tao1.yu
Hello,
syzbot tried to test the proposed patch but the build/boot failed:
32 Joules, 0 fixed counters, 10737418240 ms ovfl timer
[ 5.352811][ T1] kvm_amd: CPU 1 isn't AMD or Hygon
[ 5.356426][ T1] clocksource: tsc: mask: 0xffffffffffffffff max_cycles: 0x257a472b559, max_idle_ns: 440795210424 ns
[ 5.364035][ T1] clocksource: Switched to clocksource tsc
[ 5.406183][ T1] Initialise system trusted keyrings
[ 5.413095][ T1] workingset: timestamp_bits=40 (anon: 35) max_order=20 bucket_order=0 (anon: 0)
[ 5.427320][ T1] DLM installed
[ 5.435485][ T1] squashfs: version 4.0 (2009/01/31) Phillip Lougher
[ 5.447542][ T1] NFS: Registering the id_resolver key type
[ 5.451696][ T1] Key type id_resolver registered
[ 5.455064][ T1] Key type id_legacy registered
[ 5.458354][ T1] nfs4filelayout_init: NFSv4 File Layout Driver Registering...
[ 5.462998][ T1] nfs4flexfilelayout_init: NFSv4 Flexfile Layout Driver Registering...
[ 5.473083][ T1] smbdirect: subsystem loading...
[ 5.481054][ T1] smbdirect: subsystem loaded
[ 5.495040][ T1] Key type cifs.spnego registered
[ 5.498591][ T1] Key type cifs.idmap registered
[ 5.505968][ T1] ntfs3: Enabled Linux POSIX ACLs support
[ 5.509792][ T1] ntfs3: Read-only LZX/Xpress compression included
[ 5.514576][ T1] jffs2: version 2.2. (NAND) (SUMMARY) © 2001-2006 Red Hat, Inc.
[ 5.521918][ T1] romfs: ROMFS MTD (C) 2007 Red Hat, Inc.
[ 5.525791][ T1] QNX4 filesystem 0.2.3 registered.
[ 5.529298][ T1] qnx6: QNX6 filesystem 1.0.0 registered.
[ 5.534419][ T1] fuse: init (API version 7.45)
[ 5.540952][ T1] orangefs_debugfs_init: called with debug mask: :none: :0:
[ 5.547313][ T1] orangefs_init: module version upstream loaded
[ 5.553004][ T1] JFS: nTxBlock = 8192, nTxLock = 65536
[ 5.569758][ T1] SGI XFS with ACLs, security attributes, realtime, scrub, repair, quota, no debug enabled
[ 5.583202][ T1] 9p: Installing v9fs 9p2000 file system support
[ 5.588731][ T1] NILFS version 2 loaded
[ 5.591665][ T1] befs: version: 0.9.3
[ 5.595573][ T1] ocfs2: Registered cluster interface o2cb
[ 5.600570][ T1] ocfs2: Registered cluster interface user
[ 5.605426][ T1] OCFS2 User DLM kernel interface loaded
[ 5.627190][ T1] gfs2: GFS2 installed
[ 5.642316][ T1] ceph: loaded (mds proto 32)
[ 5.652310][ T1] NET: Registered PF_ALG protocol family
[ 5.656177][ T1] async_tx: api initialized (async)
[ 5.659751][ T1] Key type asymmetric registered
[ 5.662362][ T1] Asymmetric key parser 'x509' registered
[ 5.665396][ T1] Asymmetric key parser 'pkcs8' registered
[ 5.668828][ T1] Key type pkcs7_test registered
[ 5.671968][ T1] Block layer SCSI generic (bsg) driver version 0.4 loaded (major 239)
[ 5.678840][ T1] io scheduler mq-deadline registered
[ 5.682493][ T1] io scheduler kyber registered
[ 5.686082][ T1] io scheduler bfq registered
[ 5.689267][ T1] raid6: skipped pq benchmark and selected avx512x4
[ 5.698936][ T169] kworker/u33:5 (169) used greatest stack depth: 27160 bytes left
[ 5.719774][ T1] ACPI: \_SB_.GSIE: Enabled at IRQ 20
[ 5.731254][ T1] pcieport 0000:00:04.0: PME: Signaling with IRQ 25
[ 5.737966][ T1] pcieport 0000:00:04.0: AER: enabled with IRQ 26
[ 5.751359][ T1] input: Power Button as /devices/platform/LNXPWRBN:00/input/input0
[ 5.758527][ T1] ACPI: button: Power Button [PWRF]
[ 6.135929][ T1] ioatdma: Intel(R) QuickData Technology Driver 5.00
[ 6.184670][ T1] ACPI: \_SB_.GSIF: Enabled at IRQ 21
[ 6.224243][ T1] ACPI: \_SB_.GSIH: Enabled at IRQ 23
[ 6.376535][ T422] kworker/u33:6 (422) used greatest stack depth: 26904 bytes left
[ 6.582563][ T1] N_HDLC line discipline registered with maxframe=4096
[ 6.589499][ T1] Serial: 8250/16550 driver, 4 ports, IRQ sharing enabled
[ 6.596966][ T1] 00:04: ttyS0 at I/O 0x3f8 (irq = 4, base_baud = 115200) is a 16550A
[ 6.644100][ T1] Non-volatile memory driver v1.3
[ 6.661350][ T1] usbcore: registered new interface driver xillyusb
[ 6.669978][ T1] ACPI: bus type drm_connector registered
[ 6.689938][ T1] [drm] Initialized vgem 1.0.0 for vgem on minor 0
[ 6.693748][ T1] usbcore: registered new interface driver udl
[ 6.697950][ T1] [drm] pci: virtio-vga detected at 0000:00:01.0
[ 6.701716][ T1] virtio-pci 0000:00:01.0: vgaarb: deactivate vga console
[ 6.727071][ T1] Console: switching to colour dummy device 80x25
[ 6.732332][ T1] [drm] features: -virgl +edid -resource_blob -host_visible
[ 6.732344][ T1] [drm] features: -context_init -blob_alignment
[ 6.744000][ T1] [drm] number of scanouts: 1
[ 6.748020][ T1] [drm] number of cap sets: 0
[ 6.752914][ T1] ------------[ cut here ]------------
[ 6.755910][ T1] [PLANE:36:plane-1] pixel format with alpha exposed but blend mode not setup
[ 6.755920][ T1] WARNING: drivers/gpu/drm/drm_mode_config.c:872 at drm_mode_config_validate+0xfb4/0x1be0, CPU#2: swapper/0/1
[ 6.767418][ T1] Modules linked in:
[ 6.769701][ T1] CPU: 2 UID: 0 PID: 1 Comm: swapper/0 Not tainted syzkaller #0 PREEMPT(full)
[ 6.774395][ T1] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
[ 6.779609][ T1] RIP: 0010:drm_mode_config_validate+0xfbb/0x1be0
[ 6.783271][ T1] Code: 00 49 8b 57 18 48 89 f8 48 c1 e8 03 0f b6 04 28 84 c0 74 08 3c 03 0f 8e 00 0b 00 00 48 8d 3d bc 1c 7f 0b 41 8b b7 c8 00 00 00 <67> 48 0f b9 3a e9 fa fd ff ff 48 8b 5c 24 20 e8 11 c5 3a fc 48 8d
[ 6.795026][ T1] RSP: 0000:ffffc90000047908 EFLAGS: 00010246
[ 6.799169][ T1] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[ 6.803260][ T1] RDX: ffff888027dca9a0 RSI: 0000000000000024 RDI: ffffffff914f7d80
[ 6.807344][ T1] RBP: dffffc0000000000 R08: 0000000000000001 R09: 0000000000000000
[ 6.811371][ T1] R10: 0000000000000001 R11: 0000000000000000 R12: ffffed1004ff9e23
[ 6.815416][ T1] R13: ffffed1004ff9e24 R14: 0000000000000001 R15: ffff888027fcf028
[ 6.820211][ T1] FS: 0000000000000000(0000) GS:ffff8880d5d86000(0000) knlGS:0000000000000000
[ 6.825284][ T1] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 6.829406][ T1] CR2: 0000000000000000 CR3: 000000000eb94000 CR4: 0000000000352ef0
[ 6.833808][ T1] Call Trace:
[ 6.835812][ T1] <TASK>
[ 6.837245][ T1] ? queue_work_on+0x137/0x1e0
[ 6.839718][ T1] drm_dev_register+0x56e/0x7b0
[ 6.842181][ T1] ? aperture_remove_conflicting_pci_devices+0x138/0x1e0
[ 6.845665][ T1] virtio_gpu_probe+0x271/0x360
[ 6.848197][ T1] virtio_dev_probe+0x6a2/0xbe0
[ 6.850766][ T1] ? __pfx_virtio_dev_probe+0x10/0x10
[ 6.853811][ T1] ? kernfs_create_link+0x1bd/0x240
[ 6.856510][ T1] ? kernfs_put+0x3f/0x60
[ 6.859112][ T1] ? sysfs_do_create_link_sd+0xbb/0x140
[ 6.862571][ T1] ? sysfs_create_link+0x68/0xc0
[ 6.865746][ T1] ? __pfx_virtio_dev_probe+0x10/0x10
[ 6.869008][ T1] really_probe+0x241/0xa60
[ 6.871581][ T1] __driver_probe_device+0x210/0x460
[ 6.874260][ T1] ? _raw_spin_unlock_irqrestore+0x52/0x80
[ 6.877556][ T1] driver_probe_device+0x4a/0x140
[ 6.880231][ T1] __driver_attach+0x21f/0x5b0
[ 6.882616][ T1] ? __pfx___driver_attach+0x10/0x10
[ 6.885401][ T1] bus_for_each_dev+0x13e/0x1d0
[ 6.888683][ T1] ? __pfx_bus_for_each_dev+0x10/0x10
[ 6.892385][ T1] ? bus_add_driver+0x2b5/0x5b0
[ 6.895374][ T1] bus_add_driver+0x305/0x5b0
[ 6.897777][ T1] driver_register+0x1e2/0x360
[ 6.900188][ T1] ? __pfx_virtio_gpu_driver_init+0x10/0x10
[ 6.903143][ T1] virtio_gpu_driver_init+0xc9/0x170
[ 6.906247][ T1] do_one_initcall+0x11c/0x6f0
[ 6.908791][ T1] ? __pfx_do_one_initcall+0x10/0x10
[ 6.911643][ T1] ? kernel_init_freeable+0x4ca/0x7b0
[ 6.915241][ T1] kernel_init_freeable+0x6ea/0x7b0
[ 6.918167][ T1] ? __pfx_kernel_init+0x10/0x10
[ 6.921181][ T1] kernel_init+0x21/0x1e0
[ 6.923889][ T1] ? __pfx_kernel_init+0x10/0x10
[ 6.926426][ T1] ret_from_fork+0x730/0xd60
[ 6.929327][ T1] ? __pfx_ret_from_fork+0x10/0x10
[ 6.932314][ T1] ? __switch_to+0x800/0x10f0
[ 6.935329][ T1] ? __pfx_kernel_init+0x10/0x10
[ 6.938325][ T1] ret_from_fork_asm+0x1a/0x30
[ 6.940872][ T1] </TASK>
[ 6.942652][ T1] Kernel panic - not syncing: kernel: panic_on_warn set ...
[ 6.945295][ T1] CPU: 2 UID: 0 PID: 1 Comm: swapper/0 Not tainted syzkaller #0 PREEMPT(full)
[ 6.945295][ T1] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
[ 6.945295][ T1] Call Trace:
[ 6.945295][ T1] <TASK>
[ 6.945295][ T1] dump_stack_lvl+0x100/0x190
[ 6.945295][ T1] vpanic+0x553/0x970
[ 6.945295][ T1] ? __pfx_vpanic+0x10/0x10
[ 6.945295][ T1] panic+0xd1/0xe0
[ 6.945295][ T1] ? __pfx_panic+0x10/0x10
[ 6.945295][ T1] check_panic_on_warn.cold+0x19/0x34
[ 6.945295][ T1] ? drm_mode_config_validate+0xfb4/0x1be0
[ 6.945295][ T1] __warn.cold+0x191/0x318
[ 6.945295][ T1] __report_bug+0x30f/0x440
[ 6.945295][ T1] ? drm_mode_config_validate+0xfb4/0x1be0
[ 6.945295][ T1] ? __pfx___report_bug+0x10/0x10
[ 6.995341][ T1] ? __pfx___might_resched+0x10/0x10
[ 6.995341][ T1] ? schedule_timeout+0x161/0x280
[ 6.995341][ T1] report_bug_entry+0xe2/0x290
[ 6.995341][ T1] ? drm_mode_config_validate+0xfbb/0x1be0
[ 6.995341][ T1] handle_bug+0x1cd/0x2a0
[ 6.995341][ T1] exc_invalid_op+0x17/0x50
[ 6.995341][ T1] asm_exc_invalid_op+0x1a/0x20
[ 6.995341][ T1] RIP: 0010:drm_mode_config_validate+0xfbb/0x1be0
[ 6.995341][ T1] Code: 00 49 8b 57 18 48 89 f8 48 c1 e8 03 0f b6 04 28 84 c0 74 08 3c 03 0f 8e 00 0b 00 00 48 8d 3d bc 1c 7f 0b 41 8b b7 c8 00 00 00 <67> 48 0f b9 3a e9 fa fd ff ff 48 8b 5c 24 20 e8 11 c5 3a fc 48 8d
[ 6.995341][ T1] RSP: 0000:ffffc90000047908 EFLAGS: 00010246
[ 6.995341][ T1] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[ 6.995341][ T1] RDX: ffff888027dca9a0 RSI: 0000000000000024 RDI: ffffffff914f7d80
[ 7.045509][ T1] RBP: dffffc0000000000 R08: 0000000000000001 R09: 0000000000000000
[ 7.045509][ T1] R10: 0000000000000001 R11: 0000000000000000 R12: ffffed1004ff9e23
[ 7.045509][ T1] R13: ffffed1004ff9e24 R14: 0000000000000001 R15: ffff888027fcf028
[ 7.045509][ T1] ? drm_mode_config_validate+0xf76/0x1be0
[ 7.045509][ T1] ? queue_work_on+0x137/0x1e0
[ 7.045509][ T1] drm_dev_register+0x56e/0x7b0
[ 7.045509][ T1] ? aperture_remove_conflicting_pci_devices+0x138/0x1e0
[ 7.045509][ T1] virtio_gpu_probe+0x271/0x360
[ 7.045509][ T1] virtio_dev_probe+0x6a2/0xbe0
[ 7.045509][ T1] ? __pfx_virtio_dev_probe+0x10/0x10
[ 7.045509][ T1] ? kernfs_create_link+0x1bd/0x240
[ 7.045509][ T1] ? kernfs_put+0x3f/0x60
[ 7.045509][ T1] ? sysfs_do_create_link_sd+0xbb/0x140
[ 7.045509][ T1] ? sysfs_create_link+0x68/0xc0
[ 7.095424][ T1] ? __pfx_virtio_dev_probe+0x10/0x10
[ 7.095424][ T1] really_probe+0x241/0xa60
[ 7.095424][ T1] __driver_probe_device+0x210/0x460
[ 7.095424][ T1] ? _raw_spin_unlock_irqrestore+0x52/0x80
[ 7.095424][ T1] driver_probe_device+0x4a/0x140
[ 7.095424][ T1] __driver_attach+0x21f/0x5b0
[ 7.095424][ T1] ? __pfx___driver_attach+0x10/0x10
[ 7.095424][ T1] bus_for_each_dev+0x13e/0x1d0
[ 7.095424][ T1] ? __pfx_bus_for_each_dev+0x10/0x10
[ 7.095424][ T1] ? bus_add_driver+0x2b5/0x5b0
[ 7.095424][ T1] bus_add_driver+0x305/0x5b0
[ 7.095424][ T1] driver_register+0x1e2/0x360
[ 7.095424][ T1] ? __pfx_virtio_gpu_driver_init+0x10/0x10
[ 7.095424][ T1] virtio_gpu_driver_init+0xc9/0x170
[ 7.095424][ T1] do_one_initcall+0x11c/0x6f0
[ 7.095424][ T1] ? __pfx_do_one_initcall+0x10/0x10
[ 7.145266][ T1] ? kernel_init_freeable+0x4ca/0x7b0
[ 7.145266][ T1] kernel_init_freeable+0x6ea/0x7b0
[ 7.145266][ T1] ? __pfx_kernel_init+0x10/0x10
[ 7.145266][ T1] kernel_init+0x21/0x1e0
[ 7.145266][ T1] ? __pfx_kernel_init+0x10/0x10
[ 7.145266][ T1] ret_from_fork+0x730/0xd60
[ 7.145266][ T1] ? __pfx_ret_from_fork+0x10/0x10
[ 7.145266][ T1] ? __switch_to+0x800/0x10f0
[ 7.145266][ T1] ? __pfx_kernel_init+0x10/0x10
[ 7.145266][ T1] ret_from_fork_asm+0x1a/0x30
[ 7.145266][ T1] </TASK>
[ 7.145266][ T1] Kernel Offset: disabled
[ 7.145266][ T1] Rebooting in 86400 seconds..
syzkaller build log:
go env (err=<nil>)
AR='ar'
CC='gcc'
CGO_CFLAGS='-O2 -g'
CGO_CPPFLAGS=''
CGO_CXXFLAGS='-O2 -g'
CGO_ENABLED='1'
CGO_FFLAGS='-O2 -g'
CGO_LDFLAGS='-O2 -g'
CXX='g++'
GCCGO='gccgo'
GO111MODULE='auto'
GOAMD64='v1'
GOARCH='amd64'
GOAUTH='netrc'
GOBIN=''
GOCACHE='/syzkaller/.cache/go-build'
GOCACHEPROG=''
GODEBUG=''
GOENV='/syzkaller/.config/go/env'
GOEXE=''
GOEXPERIMENT=''
GOFIPS140='off'
GOFLAGS=''
GOGCCFLAGS='-fPIC -m64 -pthread -Wl,--no-gc-sections -fmessage-length=0 -ffile-prefix-map=/tmp/go-build395131052=/tmp/go-build -gno-record-gcc-switches'
GOHOSTARCH='amd64'
GOHOSTOS='linux'
GOINSECURE=''
GOMOD='/syzkaller/jobs/linux/gopath/src/github.com/google/syzkaller/go.mod'
GOMODCACHE='/syzkaller/jobs/linux/gopath/pkg/mod'
GONOPROXY=''
GONOSUMDB=''
GOOS='linux'
GOPATH='/syzkaller/jobs/linux/gopath'
GOPRIVATE=''
GOPROXY='https://proxy.golang.org,direct'
GOROOT='/usr/local/go'
GOSUMDB='sum.golang.org'
GOTELEMETRY='local'
GOTELEMETRYDIR='/syzkaller/.config/go/telemetry'
GOTMPDIR=''
GOTOOLCHAIN='auto'
GOTOOLDIR='/usr/local/go/pkg/tool/linux_amd64'
GOVCS=''
GOVERSION='go1.26.0'
GOWORK=''
PKG_CONFIG='pkg-config'
git status (err=<nil>)
HEAD detached at 5d63f80b763
nothing to commit, working tree clean
tput: No value for $TERM and no -T specified
tput: No value for $TERM and no -T specified
Makefile:31: run command via tools/syz-env for best compatibility, see:
Makefile:32: https://github.com/google/syzkaller/blob/master/docs/contributing.md#using-syz-env
go list -f '{{.Stale}}' -ldflags="-s -w -X github.com/google/syzkaller/prog.GitRevision=5d63f80b763910b40ae04a96c13dc75d621bea67 -X github.com/google/syzkaller/prog.gitRevisionDate=20260807-150932" ./sys/syz-sysgen | grep -q false || go install -ldflags="-s -w -X github.com/google/syzkaller/prog.GitRevision=5d63f80b763910b40ae04a96c13dc75d621bea67 -X github.com/google/syzkaller/prog.gitRevisionDate=20260807-150932" ./sys/syz-sysgen
make .descriptions
tput: No value for $TERM and no -T specified
tput: No value for $TERM and no -T specified
Makefile:31: run command via tools/syz-env for best compatibility, see:
Makefile:32: https://github.com/google/syzkaller/blob/master/docs/contributing.md#using-syz-env
bin/syz-sysgen
touch .descriptions
GOOS=linux GOARCH=amd64 go build -ldflags="-s -w -X github.com/google/syzkaller/prog.GitRevision=5d63f80b763910b40ae04a96c13dc75d621bea67 -X github.com/google/syzkaller/prog.gitRevisionDate=20260807-150932" -o ./bin/linux_amd64/syz-execprog github.com/google/syzkaller/tools/syz-execprog
mkdir -p ./bin/linux_amd64
g++ -o ./bin/linux_amd64/syz-executor executor/executor.cc \
-m64 -O2 -pthread -Wall -Werror -Wparentheses -Wunused-const-variable -Wframe-larger-than=16384 -Wno-stringop-overflow -Wno-array-bounds -Wno-format-overflow -Wno-unused-but-set-variable -Wno-unused-command-line-argument -static-pie -std=c++17 -I. -Iexecutor/_include -DGOOS_linux=1 -DGOARCH_amd64=1 \
-DHOSTGOOS_linux=1 -DGIT_REVISION=\"5d63f80b763910b40ae04a96c13dc75d621bea67\"
/usr/bin/ld: /tmp/ccMrnHjB.o: in function `Connection::Connect(char const*, char const*)':
executor.cc:(.text._ZN10Connection7ConnectEPKcS1_[_ZN10Connection7ConnectEPKcS1_]+0x386): warning: Using 'gethostbyname' in statically linked applications requires at runtime the shared libraries from the glibc version used for linking
./tools/check-syzos.sh 2>/dev/null
Error text is too large and was truncated, full error text is at:
https://syzkaller.appspot.com/x/error.txt?x=173f8979580000
Tested on:
commit: 910bf66b drm/virtio: defer host visible cleanup to man..
git tree: https://github.com/yutao-intel/linux.git fix-dri-virtio
kernel config: https://syzkaller.appspot.com/x/.config?x=28d806ce16ed1cb2
dashboard link: https://syzkaller.appspot.com/bug?extid=d93b9064fe5f74af3aa3
compiler: gcc (Debian 14.2.0-19) 14.2.0, GNU ld (GNU Binutils for Debian) 2.44
Note: no patches were applied.
^ permalink raw reply [flat|nested] 10+ messages in thread
* Re: [syzbot] [dri?] WARNING in drm_mm_takedown
[not found] <968ad555-6f0b-41f7-b84b-66f07e600262n@googlegroups.com>
@ 2026-08-24 7:44 ` syzbot
0 siblings, 0 replies; 10+ messages in thread
From: syzbot @ 2026-08-24 7:44 UTC (permalink / raw)
To: linux-kernel, syzkaller-bugs, tao1.yu
Hello,
syzbot has tested the proposed patch but the reproducer is still triggering an issue:
WARNING in drm_mm_takedown
Console: switching to colour dummy device 80x25
------------[ cut here ]------------
Memory manager not clean during takedown.
WARNING: drivers/gpu/drm/drm_mm.c:965 at drm_mm_takedown+0x62/0x280 drivers/gpu/drm/drm_mm.c:965, CPU#2: syz.0.26/6291
Modules linked in:
CPU: 2 UID: 0 PID: 6291 Comm: syz.0.26 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
RIP: 0010:drm_mm_takedown+0x62/0x280 drivers/gpu/drm/drm_mm.c:965
Code: 8b 43 38 48 39 c5 75 16 e8 eb 42 45 fc 48 83 c4 08 5b 5d 41 5c 41 5d 41 5e c3 cc cc cc cc e8 d5 42 45 fc 48 8d 3d 0e 72 68 0b <67> 48 0f b9 3a 48 c7 c0 e0 c3 46 8e 48 ba 00 00 00 00 00 fc ff df
RSP: 0018:ffffc900033ff790 EFLAGS: 00010293
RAX: 0000000000000000 RBX: ffff888034d4f468 RCX: ffffffff85c4f8ab
RDX: ffff888029f08000 RSI: ffffffff85c50d6b RDI: ffffffff912d7f80
RBP: ffff888034d4f4a0 R08: 0000000000000007 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffff88802f211800
R13: ffff88802f211818 R14: ffffffff85c3ea70 R15: 0000000000000000
FS: 00007fb8cf0616c0(0000) GS:ffff8880d5ff1000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fb8cf03fff8 CR3: 0000000027310000 CR4: 0000000000352ef0
Call Trace:
<TASK>
drm_managed_release+0x1bb/0x540 drivers/gpu/drm/drm_managed.c:75
drm_dev_release drivers/gpu/drm/drm_drv.c:914 [inline]
kref_put include/linux/kref.h:65 [inline]
drm_dev_put.part.0+0xca/0x140 drivers/gpu/drm/drm_drv.c:948
drm_dev_put+0x1f/0x30 drivers/gpu/drm/drm_drv.c:947
virtio_dev_remove+0xb8/0x170 drivers/virtio/virtio.c:375
device_remove+0xcb/0x180 drivers/base/dd.c:616
__device_release_driver drivers/base/dd.c:1349 [inline]
device_release_driver_internal+0x44e/0x620 drivers/base/dd.c:1372
bus_remove_device+0x2bc/0x560 drivers/base/bus.c:664
device_del+0x376/0x9b0 drivers/base/core.c:3961
device_unregister+0x1d/0xe0 drivers/base/core.c:4002
unregister_virtio_device+0x39/0x60 drivers/virtio/virtio.c:594
virtio_pci_remove+0x7c/0x110 drivers/virtio/virtio_pci_common.c:758
pci_device_remove+0xb2/0x1d0 drivers/pci/pci-driver.c:512
device_remove+0xcb/0x180 drivers/base/dd.c:616
__device_release_driver drivers/base/dd.c:1349 [inline]
device_release_driver_internal+0x44e/0x620 drivers/base/dd.c:1372
pci_stop_dev drivers/pci/remove.c:27 [inline]
pci_stop_bus_device+0x120/0x160 drivers/pci/remove.c:93
pci_stop_and_remove_bus_device+0x58/0xa0 drivers/pci/remove.c:128
pci_stop_and_remove_bus_device_locked+0x1a/0x20 drivers/pci/remove.c:136
remove_store+0x123/0x140 drivers/pci/pci-sysfs.c:523
dev_attr_store+0x58/0x80 drivers/base/core.c:2505
sysfs_kf_write+0xf2/0x150 fs/sysfs/file.c:145
kernfs_fop_write_iter+0x3e0/0x5f0 fs/kernfs/file.c:345
new_sync_write fs/read_write.c:595 [inline]
vfs_write+0x6ac/0x1050 fs/read_write.c:687
ksys_write+0x12a/0x250 fs/read_write.c:739
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x115/0x870 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fb8ce19e0d9
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fb8cf061028 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007fb8ce425fa0 RCX: 00007fb8ce19e0d9
RDX: 0000000000000001 RSI: 00002000000000c0 RDI: 0000000000000003
RBP: 00007fb8ce235024 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fb8ce426038 R14: 00007fb8ce425fa0 R15: 00007ffd47a213f8
</TASK>
----------------
Code disassembly (best guess):
0: 8b 43 38 mov 0x38(%rbx),%eax
3: 48 39 c5 cmp %rax,%rbp
6: 75 16 jne 0x1e
8: e8 eb 42 45 fc call 0xfc4542f8
d: 48 83 c4 08 add $0x8,%rsp
11: 5b pop %rbx
12: 5d pop %rbp
13: 41 5c pop %r12
15: 41 5d pop %r13
17: 41 5e pop %r14
19: c3 ret
1a: cc int3
1b: cc int3
1c: cc int3
1d: cc int3
1e: e8 d5 42 45 fc call 0xfc4542f8
23: 48 8d 3d 0e 72 68 0b lea 0xb68720e(%rip),%rdi # 0xb687238
* 2a: 67 48 0f b9 3a ud1 (%edx),%rdi <-- trapping instruction
2f: 48 c7 c0 e0 c3 46 8e mov $0xffffffff8e46c3e0,%rax
36: 48 ba 00 00 00 00 00 movabs $0xdffffc0000000000,%rdx
3d: fc ff df
Tested on:
commit: 3ec54d5f drm/virtio: defer host visible cleanup to man..
git tree: https://github.com/yutao-intel/linux.git fix-dri-virtio-align-HEAD
console output: https://syzkaller.appspot.com/x/log.txt?x=14512625580000
kernel config: https://syzkaller.appspot.com/x/.config?x=acc0a882b963ae23
dashboard link: https://syzkaller.appspot.com/bug?extid=d93b9064fe5f74af3aa3
compiler: gcc (Debian 14.2.0-19) 14.2.0, GNU ld (GNU Binutils for Debian) 2.44
Note: no patches were applied.
^ permalink raw reply [flat|nested] 10+ messages in thread
* Re: [syzbot] [dri?] WARNING in drm_mm_takedown
[not found] <2c1e2693-b113-4c19-931d-04b977c36dbbn@googlegroups.com>
@ 2026-08-25 3:19 ` syzbot
0 siblings, 0 replies; 10+ messages in thread
From: syzbot @ 2026-08-25 3:19 UTC (permalink / raw)
To: linux-kernel, syzkaller-bugs, tao1.yu
Hello,
syzbot has tested the proposed patch but the reproducer is still triggering an issue:
WARNING in drm_mm_takedown
Console: switching to colour dummy device 80x25
------------[ cut here ]------------
Memory manager not clean during takedown.
WARNING: drivers/gpu/drm/drm_mm.c:965 at drm_mm_takedown+0x62/0x280 drivers/gpu/drm/drm_mm.c:965, CPU#3: syz.0.24/6257
Modules linked in:
CPU: 3 UID: 0 PID: 6257 Comm: syz.0.24 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
RIP: 0010:drm_mm_takedown+0x62/0x280 drivers/gpu/drm/drm_mm.c:965
Code: 8b 43 38 48 39 c5 75 16 e8 eb 42 45 fc 48 83 c4 08 5b 5d 41 5c 41 5d 41 5e c3 cc cc cc cc e8 d5 42 45 fc 48 8d 3d 0e 72 68 0b <67> 48 0f b9 3a 48 c7 c0 e0 c3 46 8e 48 ba 00 00 00 00 00 fc ff df
RSP: 0018:ffffc90003087790 EFLAGS: 00010293
RAX: 0000000000000000 RBX: ffff88802d6bdc68 RCX: ffffffff85c4f8ab
RDX: ffff88802a662540 RSI: ffffffff85c50d6b RDI: ffffffff912d7f80
RBP: ffff88802d6bdca0 R08: 0000000000000007 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffff888023321600
R13: ffff888023321618 R14: ffffffff85c3ea70 R15: 0000000000000000
FS: 00007ff16d1b16c0(0000) GS:ffff8880d60f1000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ff16c627dac CR3: 0000000029db0000 CR4: 0000000000352ef0
Call Trace:
<TASK>
drm_managed_release+0x1bb/0x540 drivers/gpu/drm/drm_managed.c:75
drm_dev_release drivers/gpu/drm/drm_drv.c:914 [inline]
kref_put include/linux/kref.h:65 [inline]
drm_dev_put.part.0+0xca/0x140 drivers/gpu/drm/drm_drv.c:948
drm_dev_put+0x1f/0x30 drivers/gpu/drm/drm_drv.c:947
virtio_dev_remove+0xb8/0x170 drivers/virtio/virtio.c:375
device_remove+0xcb/0x180 drivers/base/dd.c:616
__device_release_driver drivers/base/dd.c:1349 [inline]
device_release_driver_internal+0x44e/0x620 drivers/base/dd.c:1372
bus_remove_device+0x2bc/0x560 drivers/base/bus.c:664
device_del+0x376/0x9b0 drivers/base/core.c:3961
device_unregister+0x1d/0xe0 drivers/base/core.c:4002
unregister_virtio_device+0x39/0x60 drivers/virtio/virtio.c:594
virtio_pci_remove+0x7c/0x110 drivers/virtio/virtio_pci_common.c:758
pci_device_remove+0xb2/0x1d0 drivers/pci/pci-driver.c:512
device_remove+0xcb/0x180 drivers/base/dd.c:616
__device_release_driver drivers/base/dd.c:1349 [inline]
device_release_driver_internal+0x44e/0x620 drivers/base/dd.c:1372
pci_stop_dev drivers/pci/remove.c:27 [inline]
pci_stop_bus_device+0x120/0x160 drivers/pci/remove.c:93
pci_stop_and_remove_bus_device+0x58/0xa0 drivers/pci/remove.c:128
pci_stop_and_remove_bus_device_locked+0x1a/0x20 drivers/pci/remove.c:136
remove_store+0x123/0x140 drivers/pci/pci-sysfs.c:523
dev_attr_store+0x58/0x80 drivers/base/core.c:2505
sysfs_kf_write+0xf2/0x150 fs/sysfs/file.c:145
kernfs_fop_write_iter+0x3e0/0x5f0 fs/kernfs/file.c:345
new_sync_write fs/read_write.c:595 [inline]
vfs_write+0x6ac/0x1050 fs/read_write.c:687
ksys_write+0x12a/0x250 fs/read_write.c:739
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x115/0x870 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7ff16c39e0d9
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ff16d1b1028 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007ff16c625fa0 RCX: 00007ff16c39e0d9
RDX: 0000000000000001 RSI: 00002000000000c0 RDI: 0000000000000003
RBP: 00007ff16c435024 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ff16c626038 R14: 00007ff16c625fa0 R15: 00007ffc4bf9de98
</TASK>
----------------
Code disassembly (best guess):
0: 8b 43 38 mov 0x38(%rbx),%eax
3: 48 39 c5 cmp %rax,%rbp
6: 75 16 jne 0x1e
8: e8 eb 42 45 fc call 0xfc4542f8
d: 48 83 c4 08 add $0x8,%rsp
11: 5b pop %rbx
12: 5d pop %rbp
13: 41 5c pop %r12
15: 41 5d pop %r13
17: 41 5e pop %r14
19: c3 ret
1a: cc int3
1b: cc int3
1c: cc int3
1d: cc int3
1e: e8 d5 42 45 fc call 0xfc4542f8
23: 48 8d 3d 0e 72 68 0b lea 0xb68720e(%rip),%rdi # 0xb687238
* 2a: 67 48 0f b9 3a ud1 (%edx),%rdi <-- trapping instruction
2f: 48 c7 c0 e0 c3 46 8e mov $0xffffffff8e46c3e0,%rax
36: 48 ba 00 00 00 00 00 movabs $0xdffffc0000000000,%rdx
3d: fc ff df
Tested on:
commit: 3a4435f6 drm/virtio: tear down host visible drm_mm wit..
git tree: https://github.com/yutao-intel/linux.git fix-dri-virtio-align-HEAD
console output: https://syzkaller.appspot.com/x/log.txt?x=10efe415580000
kernel config: https://syzkaller.appspot.com/x/.config?x=acc0a882b963ae23
dashboard link: https://syzkaller.appspot.com/bug?extid=d93b9064fe5f74af3aa3
compiler: gcc (Debian 14.2.0-19) 14.2.0, GNU ld (GNU Binutils for Debian) 2.44
Note: no patches were applied.
^ permalink raw reply [flat|nested] 10+ messages in thread
* Re: [syzbot] [dri?] WARNING in drm_mm_takedown
[not found] <3be6397f-9566-488f-a1c2-05988c0f28c7n@googlegroups.com>
@ 2026-08-25 3:44 ` syzbot
0 siblings, 0 replies; 10+ messages in thread
From: syzbot @ 2026-08-25 3:44 UTC (permalink / raw)
To: linux-kernel, syzkaller-bugs, tao1.yu
Hello,
syzbot has tested the proposed patch but the reproducer is still triggering an issue:
WARNING in drm_mm_takedown
Console: switching to colour dummy device 80x25
------------[ cut here ]------------
Memory manager not clean during takedown.
WARNING: drivers/gpu/drm/drm_mm.c:965 at drm_mm_takedown+0x62/0x280 drivers/gpu/drm/drm_mm.c:965, CPU#3: syz.0.23/6278
Modules linked in:
CPU: 3 UID: 0 PID: 6278 Comm: syz.0.23 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
RIP: 0010:drm_mm_takedown+0x62/0x280 drivers/gpu/drm/drm_mm.c:965
Code: 8b 43 38 48 39 c5 75 16 e8 eb 42 45 fc 48 83 c4 08 5b 5d 41 5c 41 5d 41 5e c3 cc cc cc cc e8 d5 42 45 fc 48 8d 3d 0e 72 68 0b <67> 48 0f b9 3a 48 c7 c0 e0 c3 46 8e 48 ba 00 00 00 00 00 fc ff df
RSP: 0018:ffffc90003c2f790 EFLAGS: 00010293
RAX: 0000000000000000 RBX: ffff88803b7d1868 RCX: ffffffff85c4f8ab
RDX: ffff88802b49a540 RSI: ffffffff85c50d6b RDI: ffffffff912d7f80
RBP: ffff88803b7d18a0 R08: 0000000000000007 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffff88802bc8ed00
R13: ffff88802bc8ed18 R14: ffffffff85c3ea70 R15: 0000000000000000
FS: 00007f7ae5c196c0(0000) GS:ffff8880d60f1000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffc84fbc0b8 CR3: 0000000038100000 CR4: 0000000000352ef0
Call Trace:
<TASK>
drm_managed_release+0x1bb/0x540 drivers/gpu/drm/drm_managed.c:75
drm_dev_release drivers/gpu/drm/drm_drv.c:914 [inline]
kref_put include/linux/kref.h:65 [inline]
drm_dev_put.part.0+0xca/0x140 drivers/gpu/drm/drm_drv.c:948
drm_dev_put+0x1f/0x30 drivers/gpu/drm/drm_drv.c:947
virtio_dev_remove+0xb8/0x170 drivers/virtio/virtio.c:375
device_remove+0xcb/0x180 drivers/base/dd.c:616
__device_release_driver drivers/base/dd.c:1349 [inline]
device_release_driver_internal+0x44e/0x620 drivers/base/dd.c:1372
bus_remove_device+0x2bc/0x560 drivers/base/bus.c:664
device_del+0x376/0x9b0 drivers/base/core.c:3961
device_unregister+0x1d/0xe0 drivers/base/core.c:4002
unregister_virtio_device+0x39/0x60 drivers/virtio/virtio.c:594
virtio_pci_remove+0x7c/0x110 drivers/virtio/virtio_pci_common.c:758
pci_device_remove+0xb2/0x1d0 drivers/pci/pci-driver.c:512
device_remove+0xcb/0x180 drivers/base/dd.c:616
__device_release_driver drivers/base/dd.c:1349 [inline]
device_release_driver_internal+0x44e/0x620 drivers/base/dd.c:1372
pci_stop_dev drivers/pci/remove.c:27 [inline]
pci_stop_bus_device+0x120/0x160 drivers/pci/remove.c:93
pci_stop_and_remove_bus_device+0x58/0xa0 drivers/pci/remove.c:128
pci_stop_and_remove_bus_device_locked+0x1a/0x20 drivers/pci/remove.c:136
remove_store+0x123/0x140 drivers/pci/pci-sysfs.c:523
dev_attr_store+0x58/0x80 drivers/base/core.c:2505
sysfs_kf_write+0xf2/0x150 fs/sysfs/file.c:145
kernfs_fop_write_iter+0x3e0/0x5f0 fs/kernfs/file.c:345
new_sync_write fs/read_write.c:595 [inline]
vfs_write+0x6ac/0x1050 fs/read_write.c:687
ksys_write+0x12a/0x250 fs/read_write.c:739
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x115/0x870 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f7ae4d9e0d9
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f7ae5c19028 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f7ae5025fa0 RCX: 00007f7ae4d9e0d9
RDX: 0000000000000001 RSI: 00002000000000c0 RDI: 0000000000000003
RBP: 00007f7ae4e35024 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f7ae5026038 R14: 00007f7ae5025fa0 R15: 00007ffc84fbbd58
</TASK>
----------------
Code disassembly (best guess):
0: 8b 43 38 mov 0x38(%rbx),%eax
3: 48 39 c5 cmp %rax,%rbp
6: 75 16 jne 0x1e
8: e8 eb 42 45 fc call 0xfc4542f8
d: 48 83 c4 08 add $0x8,%rsp
11: 5b pop %rbx
12: 5d pop %rbp
13: 41 5c pop %r12
15: 41 5d pop %r13
17: 41 5e pop %r14
19: c3 ret
1a: cc int3
1b: cc int3
1c: cc int3
1d: cc int3
1e: e8 d5 42 45 fc call 0xfc4542f8
23: 48 8d 3d 0e 72 68 0b lea 0xb68720e(%rip),%rdi # 0xb687238
* 2a: 67 48 0f b9 3a ud1 (%edx),%rdi <-- trapping instruction
2f: 48 c7 c0 e0 c3 46 8e mov $0xffffffff8e46c3e0,%rax
36: 48 ba 00 00 00 00 00 movabs $0xdffffc0000000000,%rdx
3d: fc ff df
Tested on:
commit: 633a40fd drm/virtio: reclaim pending vbufs before host..
git tree: https://github.com/yutao-intel/linux.git fix-dri-virtio-align-HEAD
console output: https://syzkaller.appspot.com/x/log.txt?x=12801415580000
kernel config: https://syzkaller.appspot.com/x/.config?x=acc0a882b963ae23
dashboard link: https://syzkaller.appspot.com/bug?extid=d93b9064fe5f74af3aa3
compiler: gcc (Debian 14.2.0-19) 14.2.0, GNU ld (GNU Binutils for Debian) 2.44
Note: no patches were applied.
^ permalink raw reply [flat|nested] 10+ messages in thread
* Re: [syzbot] [dri?] WARNING in drm_mm_takedown
[not found] <df3a1b07-755a-403e-8229-2b11ee55cc01n@googlegroups.com>
@ 2026-08-25 4:30 ` syzbot
0 siblings, 0 replies; 10+ messages in thread
From: syzbot @ 2026-08-25 4:30 UTC (permalink / raw)
To: linux-kernel, syzkaller-bugs, tao1.yu
Hello,
syzbot has tested the proposed patch but the reproducer is still triggering an issue:
WARNING in drm_mm_takedown
Console: switching to colour dummy device 80x25
------------[ cut here ]------------
Memory manager not clean during takedown.
WARNING: drivers/gpu/drm/drm_mm.c:965 at drm_mm_takedown+0x62/0x280 drivers/gpu/drm/drm_mm.c:965, CPU#1: syz.0.22/6271
Modules linked in:
CPU: 1 UID: 0 PID: 6271 Comm: syz.0.22 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
RIP: 0010:drm_mm_takedown+0x62/0x280 drivers/gpu/drm/drm_mm.c:965
Code: 8b 43 38 48 39 c5 75 16 e8 eb 42 45 fc 48 83 c4 08 5b 5d 41 5c 41 5d 41 5e c3 cc cc cc cc e8 d5 42 45 fc 48 8d 3d 0e 72 68 0b <67> 48 0f b9 3a 48 c7 c0 e0 c3 46 8e 48 ba 00 00 00 00 00 fc ff df
RSP: 0018:ffffc9000607f790 EFLAGS: 00010293
RAX: 0000000000000000 RBX: ffff88804754e868 RCX: ffffffff85c4f8ab
RDX: ffff888025482540 RSI: ffffffff85c50d6b RDI: ffffffff912d7f80
RBP: ffff88804754e8a0 R08: 0000000000000007 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffff88803d419400
R13: ffff88803d419418 R14: ffffffff85c3ea70 R15: 0000000000000000
FS: 00007f803fef06c0(0000) GS:ffff8880d5ef1000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f803feceff8 CR3: 000000003e66d000 CR4: 0000000000352ef0
Call Trace:
<TASK>
drm_managed_release+0x1bb/0x540 drivers/gpu/drm/drm_managed.c:75
drm_dev_release drivers/gpu/drm/drm_drv.c:914 [inline]
kref_put include/linux/kref.h:65 [inline]
drm_dev_put.part.0+0xca/0x140 drivers/gpu/drm/drm_drv.c:948
drm_dev_put+0x1f/0x30 drivers/gpu/drm/drm_drv.c:947
virtio_dev_remove+0xb8/0x170 drivers/virtio/virtio.c:375
device_remove+0xcb/0x180 drivers/base/dd.c:616
__device_release_driver drivers/base/dd.c:1349 [inline]
device_release_driver_internal+0x44e/0x620 drivers/base/dd.c:1372
bus_remove_device+0x2bc/0x560 drivers/base/bus.c:664
device_del+0x376/0x9b0 drivers/base/core.c:3961
device_unregister+0x1d/0xe0 drivers/base/core.c:4002
unregister_virtio_device+0x39/0x60 drivers/virtio/virtio.c:594
virtio_pci_remove+0x7c/0x110 drivers/virtio/virtio_pci_common.c:758
pci_device_remove+0xb2/0x1d0 drivers/pci/pci-driver.c:512
device_remove+0xcb/0x180 drivers/base/dd.c:616
__device_release_driver drivers/base/dd.c:1349 [inline]
device_release_driver_internal+0x44e/0x620 drivers/base/dd.c:1372
pci_stop_dev drivers/pci/remove.c:27 [inline]
pci_stop_bus_device+0x120/0x160 drivers/pci/remove.c:93
pci_stop_and_remove_bus_device+0x58/0xa0 drivers/pci/remove.c:128
pci_stop_and_remove_bus_device_locked+0x1a/0x20 drivers/pci/remove.c:136
remove_store+0x123/0x140 drivers/pci/pci-sysfs.c:523
dev_attr_store+0x58/0x80 drivers/base/core.c:2505
sysfs_kf_write+0xf2/0x150 fs/sysfs/file.c:145
kernfs_fop_write_iter+0x3e0/0x5f0 fs/kernfs/file.c:345
new_sync_write fs/read_write.c:595 [inline]
vfs_write+0x6ac/0x1050 fs/read_write.c:687
ksys_write+0x12a/0x250 fs/read_write.c:739
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x115/0x870 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f803ef9e0d9
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f803fef0028 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f803f225fa0 RCX: 00007f803ef9e0d9
RDX: 0000000000000001 RSI: 00002000000000c0 RDI: 0000000000000003
RBP: 00007f803f035024 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f803f226038 R14: 00007f803f225fa0 R15: 00007fffd7f01f68
</TASK>
----------------
Code disassembly (best guess):
0: 8b 43 38 mov 0x38(%rbx),%eax
3: 48 39 c5 cmp %rax,%rbp
6: 75 16 jne 0x1e
8: e8 eb 42 45 fc call 0xfc4542f8
d: 48 83 c4 08 add $0x8,%rsp
11: 5b pop %rbx
12: 5d pop %rbp
13: 41 5c pop %r12
15: 41 5d pop %r13
17: 41 5e pop %r14
19: c3 ret
1a: cc int3
1b: cc int3
1c: cc int3
1d: cc int3
1e: e8 d5 42 45 fc call 0xfc4542f8
23: 48 8d 3d 0e 72 68 0b lea 0xb68720e(%rip),%rdi # 0xb687238
* 2a: 67 48 0f b9 3a ud1 (%edx),%rdi <-- trapping instruction
2f: 48 c7 c0 e0 c3 46 8e mov $0xffffffff8e46c3e0,%rax
36: 48 ba 00 00 00 00 00 movabs $0xdffffc0000000000,%rdx
3d: fc ff df
Tested on:
commit: 93427272 drm/virtio: fix host-visible blob cleanup on ..
git tree: https://github.com/yutao-intel/linux.git fix-dri-virtio-align-HEAD
console output: https://syzkaller.appspot.com/x/log.txt?x=12ffc979580000
kernel config: https://syzkaller.appspot.com/x/.config?x=acc0a882b963ae23
dashboard link: https://syzkaller.appspot.com/bug?extid=d93b9064fe5f74af3aa3
compiler: gcc (Debian 14.2.0-19) 14.2.0, GNU ld (GNU Binutils for Debian) 2.44
Note: no patches were applied.
^ permalink raw reply [flat|nested] 10+ messages in thread
* Re: [syzbot] [dri?] WARNING in drm_mm_takedown
[not found] <4be92c36-cfd3-4f20-baf0-04baac37ad1an@googlegroups.com>
@ 2026-08-25 4:51 ` syzbot
0 siblings, 0 replies; 10+ messages in thread
From: syzbot @ 2026-08-25 4:51 UTC (permalink / raw)
To: linux-kernel, syzkaller-bugs, tao1.yu
Hello,
syzbot has tested the proposed patch but the reproducer is still triggering an issue:
WARNING in drm_mm_takedown
Console: switching to colour dummy device 80x25
------------[ cut here ]------------
Memory manager not clean during takedown.
WARNING: drivers/gpu/drm/drm_mm.c:965 at drm_mm_takedown+0x62/0x280 drivers/gpu/drm/drm_mm.c:965, CPU#3: syz.0.19/6260
Modules linked in:
CPU: 3 UID: 0 PID: 6260 Comm: syz.0.19 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
RIP: 0010:drm_mm_takedown+0x62/0x280 drivers/gpu/drm/drm_mm.c:965
Code: 8b 43 38 48 39 c5 75 16 e8 eb 42 45 fc 48 83 c4 08 5b 5d 41 5c 41 5d 41 5e c3 cc cc cc cc e8 d5 42 45 fc 48 8d 3d 0e 72 68 0b <67> 48 0f b9 3a 48 c7 c0 e0 c3 46 8e 48 ba 00 00 00 00 00 fc ff df
RSP: 0018:ffffc90004c37790 EFLAGS: 00010293
RAX: 0000000000000000 RBX: ffff888035627068 RCX: ffffffff85c4f8ab
RDX: ffff8880306d8000 RSI: ffffffff85c50d6b RDI: ffffffff912d7f80
RBP: ffff8880356270a0 R08: 0000000000000007 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffff88802ddce100
R13: ffff88802ddce118 R14: ffffffff85c3ea70 R15: 0000000000000000
FS: 00007ff439fc06c0(0000) GS:ffff8880d60f1000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ff4391eb7c0 CR3: 000000003d740000 CR4: 0000000000352ef0
Call Trace:
<TASK>
drm_managed_release+0x1bb/0x540 drivers/gpu/drm/drm_managed.c:75
drm_dev_release drivers/gpu/drm/drm_drv.c:914 [inline]
kref_put include/linux/kref.h:65 [inline]
drm_dev_put.part.0+0xca/0x140 drivers/gpu/drm/drm_drv.c:948
drm_dev_put+0x1f/0x30 drivers/gpu/drm/drm_drv.c:947
virtio_dev_remove+0xb8/0x170 drivers/virtio/virtio.c:375
device_remove+0xcb/0x180 drivers/base/dd.c:616
__device_release_driver drivers/base/dd.c:1349 [inline]
device_release_driver_internal+0x44e/0x620 drivers/base/dd.c:1372
bus_remove_device+0x2bc/0x560 drivers/base/bus.c:664
device_del+0x376/0x9b0 drivers/base/core.c:3961
device_unregister+0x1d/0xe0 drivers/base/core.c:4002
unregister_virtio_device+0x39/0x60 drivers/virtio/virtio.c:594
virtio_pci_remove+0x7c/0x110 drivers/virtio/virtio_pci_common.c:758
pci_device_remove+0xb2/0x1d0 drivers/pci/pci-driver.c:512
device_remove+0xcb/0x180 drivers/base/dd.c:616
__device_release_driver drivers/base/dd.c:1349 [inline]
device_release_driver_internal+0x44e/0x620 drivers/base/dd.c:1372
pci_stop_dev drivers/pci/remove.c:27 [inline]
pci_stop_bus_device+0x120/0x160 drivers/pci/remove.c:93
pci_stop_and_remove_bus_device+0x58/0xa0 drivers/pci/remove.c:128
pci_stop_and_remove_bus_device_locked+0x1a/0x20 drivers/pci/remove.c:136
remove_store+0x123/0x140 drivers/pci/pci-sysfs.c:523
dev_attr_store+0x58/0x80 drivers/base/core.c:2505
sysfs_kf_write+0xf2/0x150 fs/sysfs/file.c:145
kernfs_fop_write_iter+0x3e0/0x5f0 fs/kernfs/file.c:345
new_sync_write fs/read_write.c:595 [inline]
vfs_write+0x6ac/0x1050 fs/read_write.c:687
ksys_write+0x12a/0x250 fs/read_write.c:739
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x115/0x870 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7ff43919e0d9
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ff439fc0028 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007ff439425fa0 RCX: 00007ff43919e0d9
RDX: 0000000000000001 RSI: 00002000000000c0 RDI: 0000000000000003
RBP: 00007ff439235024 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ff439426038 R14: 00007ff439425fa0 R15: 00007ffd37125a48
</TASK>
----------------
Code disassembly (best guess):
0: 8b 43 38 mov 0x38(%rbx),%eax
3: 48 39 c5 cmp %rax,%rbp
6: 75 16 jne 0x1e
8: e8 eb 42 45 fc call 0xfc4542f8
d: 48 83 c4 08 add $0x8,%rsp
11: 5b pop %rbx
12: 5d pop %rbp
13: 41 5c pop %r12
15: 41 5d pop %r13
17: 41 5e pop %r14
19: c3 ret
1a: cc int3
1b: cc int3
1c: cc int3
1d: cc int3
1e: e8 d5 42 45 fc call 0xfc4542f8
23: 48 8d 3d 0e 72 68 0b lea 0xb68720e(%rip),%rdi # 0xb687238
* 2a: 67 48 0f b9 3a ud1 (%edx),%rdi <-- trapping instruction
2f: 48 c7 c0 e0 c3 46 8e mov $0xffffffff8e46c3e0,%rax
36: 48 ba 00 00 00 00 00 movabs $0xdffffc0000000000,%rdx
3d: fc ff df
Tested on:
commit: 9517d0ab drm/virtio: clean up GEM objects locally afte..
git tree: https://github.com/yutao-intel/linux.git fix-dri-virtio-align-HEAD
console output: https://syzkaller.appspot.com/x/log.txt?x=17951979580000
kernel config: https://syzkaller.appspot.com/x/.config?x=acc0a882b963ae23
dashboard link: https://syzkaller.appspot.com/bug?extid=d93b9064fe5f74af3aa3
compiler: gcc (Debian 14.2.0-19) 14.2.0, GNU ld (GNU Binutils for Debian) 2.44
Note: no patches were applied.
^ permalink raw reply [flat|nested] 10+ messages in thread
* Re: [syzbot] [dri?] WARNING in drm_mm_takedown
[not found] <97cf567b-b9a9-4256-8cc8-854c0a0dc4c5n@googlegroups.com>
@ 2026-08-25 5:26 ` syzbot
0 siblings, 0 replies; 10+ messages in thread
From: syzbot @ 2026-08-25 5:26 UTC (permalink / raw)
To: linux-kernel, syzkaller-bugs, tao1.yu
Hello,
syzbot has tested the proposed patch but the reproducer is still triggering an issue:
WARNING in drm_mm_takedown
Console: switching to colour dummy device 80x25
------------[ cut here ]------------
Memory manager not clean during takedown.
WARNING: drivers/gpu/drm/drm_mm.c:965 at drm_mm_takedown+0x62/0x280 drivers/gpu/drm/drm_mm.c:965, CPU#1: syz.0.21/6266
Modules linked in:
CPU: 1 UID: 0 PID: 6266 Comm: syz.0.21 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
RIP: 0010:drm_mm_takedown+0x62/0x280 drivers/gpu/drm/drm_mm.c:965
Code: 8b 43 38 48 39 c5 75 16 e8 eb 42 45 fc 48 83 c4 08 5b 5d 41 5c 41 5d 41 5e c3 cc cc cc cc e8 d5 42 45 fc 48 8d 3d 0e 72 68 0b <67> 48 0f b9 3a 48 c7 c0 e0 c3 46 8e 48 ba 00 00 00 00 00 fc ff df
RSP: 0018:ffffc90003787790 EFLAGS: 00010293
RAX: 0000000000000000 RBX: ffff888031d8c468 RCX: ffffffff85c4f8ab
RDX: ffff888034680000 RSI: ffffffff85c50d6b RDI: ffffffff912d7f80
RBP: ffff888031d8c4a0 R08: 0000000000000007 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffff888032410600
R13: ffff888032410618 R14: ffffffff85c3ea70 R15: 0000000000000000
FS: 00007fa69b2526c0(0000) GS:ffff8880d5ef1000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fa69a3eb7c0 CR3: 000000003a633000 CR4: 0000000000352ef0
Call Trace:
<TASK>
drm_managed_release+0x1bb/0x540 drivers/gpu/drm/drm_managed.c:75
drm_dev_release drivers/gpu/drm/drm_drv.c:914 [inline]
kref_put include/linux/kref.h:65 [inline]
drm_dev_put.part.0+0xca/0x140 drivers/gpu/drm/drm_drv.c:948
drm_dev_put+0x1f/0x30 drivers/gpu/drm/drm_drv.c:947
virtio_dev_remove+0xb8/0x170 drivers/virtio/virtio.c:375
device_remove+0xcb/0x180 drivers/base/dd.c:616
__device_release_driver drivers/base/dd.c:1349 [inline]
device_release_driver_internal+0x44e/0x620 drivers/base/dd.c:1372
bus_remove_device+0x2bc/0x560 drivers/base/bus.c:664
device_del+0x376/0x9b0 drivers/base/core.c:3961
device_unregister+0x1d/0xe0 drivers/base/core.c:4002
unregister_virtio_device+0x39/0x60 drivers/virtio/virtio.c:594
virtio_pci_remove+0x7c/0x110 drivers/virtio/virtio_pci_common.c:758
pci_device_remove+0xb2/0x1d0 drivers/pci/pci-driver.c:512
device_remove+0xcb/0x180 drivers/base/dd.c:616
__device_release_driver drivers/base/dd.c:1349 [inline]
device_release_driver_internal+0x44e/0x620 drivers/base/dd.c:1372
pci_stop_dev drivers/pci/remove.c:27 [inline]
pci_stop_bus_device+0x120/0x160 drivers/pci/remove.c:93
pci_stop_and_remove_bus_device+0x58/0xa0 drivers/pci/remove.c:128
pci_stop_and_remove_bus_device_locked+0x1a/0x20 drivers/pci/remove.c:136
remove_store+0x123/0x140 drivers/pci/pci-sysfs.c:523
dev_attr_store+0x58/0x80 drivers/base/core.c:2505
sysfs_kf_write+0xf2/0x150 fs/sysfs/file.c:145
kernfs_fop_write_iter+0x3e0/0x5f0 fs/kernfs/file.c:345
new_sync_write fs/read_write.c:595 [inline]
vfs_write+0x6ac/0x1050 fs/read_write.c:687
ksys_write+0x12a/0x250 fs/read_write.c:739
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x115/0x870 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fa69a39e0d9
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fa69b252028 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007fa69a625fa0 RCX: 00007fa69a39e0d9
RDX: 0000000000000001 RSI: 00002000000000c0 RDI: 0000000000000003
RBP: 00007fa69a435024 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fa69a626038 R14: 00007fa69a625fa0 R15: 00007ffdd9e894b8
</TASK>
----------------
Code disassembly (best guess):
0: 8b 43 38 mov 0x38(%rbx),%eax
3: 48 39 c5 cmp %rax,%rbp
6: 75 16 jne 0x1e
8: e8 eb 42 45 fc call 0xfc4542f8
d: 48 83 c4 08 add $0x8,%rsp
11: 5b pop %rbx
12: 5d pop %rbp
13: 41 5c pop %r12
15: 41 5d pop %r13
17: 41 5e pop %r14
19: c3 ret
1a: cc int3
1b: cc int3
1c: cc int3
1d: cc int3
1e: e8 d5 42 45 fc call 0xfc4542f8
23: 48 8d 3d 0e 72 68 0b lea 0xb68720e(%rip),%rdi # 0xb687238
* 2a: 67 48 0f b9 3a ud1 (%edx),%rdi <-- trapping instruction
2f: 48 c7 c0 e0 c3 46 8e mov $0xffffffff8e46c3e0,%rax
36: 48 ba 00 00 00 00 00 movabs $0xdffffc0000000000,%rdx
3d: fc ff df
Tested on:
commit: b51b5de4 drm/virtio: fix host-visible blob cleanup dur..
git tree: https://github.com/yutao-intel/linux.git fix-dri-virtio-align-HEAD
console output: https://syzkaller.appspot.com/x/log.txt?x=12926625580000
kernel config: https://syzkaller.appspot.com/x/.config?x=acc0a882b963ae23
dashboard link: https://syzkaller.appspot.com/bug?extid=d93b9064fe5f74af3aa3
compiler: gcc (Debian 14.2.0-19) 14.2.0, GNU ld (GNU Binutils for Debian) 2.44
Note: no patches were applied.
^ permalink raw reply [flat|nested] 10+ messages in thread
* Re: [syzbot] [dri?] WARNING in drm_mm_takedown
[not found] <30a3accb-d060-4a00-86da-d4e4c9ea7dcfn@googlegroups.com>
@ 2026-08-25 6:23 ` syzbot
0 siblings, 0 replies; 10+ messages in thread
From: syzbot @ 2026-08-25 6:23 UTC (permalink / raw)
To: linux-kernel, syzkaller-bugs, tao1.yu
Hello,
syzbot has tested the proposed patch but the reproducer is still triggering an issue:
WARNING in drm_mm_takedown
Console: switching to colour dummy device 80x25
------------[ cut here ]------------
Memory manager not clean during takedown.
WARNING: drivers/gpu/drm/drm_mm.c:965 at drm_mm_takedown+0x62/0x280 drivers/gpu/drm/drm_mm.c:965, CPU#0: syz.0.20/6274
Modules linked in:
CPU: 0 UID: 0 PID: 6274 Comm: syz.0.20 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
RIP: 0010:drm_mm_takedown+0x62/0x280 drivers/gpu/drm/drm_mm.c:965
Code: 8b 43 38 48 39 c5 75 16 e8 eb 42 45 fc 48 83 c4 08 5b 5d 41 5c 41 5d 41 5e c3 cc cc cc cc e8 d5 42 45 fc 48 8d 3d 0e 72 68 0b <67> 48 0f b9 3a 48 c7 c0 e0 c3 46 8e 48 ba 00 00 00 00 00 fc ff df
RSP: 0018:ffffc900039a7790 EFLAGS: 00010293
RAX: 0000000000000000 RBX: ffff888054192868 RCX: ffffffff85c4f8ab
RDX: ffff888027242540 RSI: ffffffff85c50d6b RDI: ffffffff912d7f80
RBP: ffff8880541928a0 R08: 0000000000000007 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffff88803cab1800
R13: ffff88803cab1818 R14: ffffffff85c3ea70 R15: 0000000000000000
FS: 00007fc41db8e6c0(0000) GS:ffff8880d5df1000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00005555587e99e8 CR3: 0000000038517000 CR4: 0000000000352ef0
Call Trace:
<TASK>
drm_managed_release+0x1bb/0x540 drivers/gpu/drm/drm_managed.c:75
drm_dev_release drivers/gpu/drm/drm_drv.c:914 [inline]
kref_put include/linux/kref.h:65 [inline]
drm_dev_put.part.0+0xca/0x140 drivers/gpu/drm/drm_drv.c:948
drm_dev_put+0x1f/0x30 drivers/gpu/drm/drm_drv.c:947
virtio_dev_remove+0xb8/0x170 drivers/virtio/virtio.c:375
device_remove+0xcb/0x180 drivers/base/dd.c:616
__device_release_driver drivers/base/dd.c:1349 [inline]
device_release_driver_internal+0x44e/0x620 drivers/base/dd.c:1372
bus_remove_device+0x2bc/0x560 drivers/base/bus.c:664
device_del+0x376/0x9b0 drivers/base/core.c:3961
device_unregister+0x1d/0xe0 drivers/base/core.c:4002
unregister_virtio_device+0x39/0x60 drivers/virtio/virtio.c:594
virtio_pci_remove+0x7c/0x110 drivers/virtio/virtio_pci_common.c:758
pci_device_remove+0xb2/0x1d0 drivers/pci/pci-driver.c:512
device_remove+0xcb/0x180 drivers/base/dd.c:616
__device_release_driver drivers/base/dd.c:1349 [inline]
device_release_driver_internal+0x44e/0x620 drivers/base/dd.c:1372
pci_stop_dev drivers/pci/remove.c:27 [inline]
pci_stop_bus_device+0x120/0x160 drivers/pci/remove.c:93
pci_stop_and_remove_bus_device+0x58/0xa0 drivers/pci/remove.c:128
pci_stop_and_remove_bus_device_locked+0x1a/0x20 drivers/pci/remove.c:136
remove_store+0x123/0x140 drivers/pci/pci-sysfs.c:523
dev_attr_store+0x58/0x80 drivers/base/core.c:2505
sysfs_kf_write+0xf2/0x150 fs/sysfs/file.c:145
kernfs_fop_write_iter+0x3e0/0x5f0 fs/kernfs/file.c:345
new_sync_write fs/read_write.c:595 [inline]
vfs_write+0x6ac/0x1050 fs/read_write.c:687
ksys_write+0x12a/0x250 fs/read_write.c:739
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x115/0x870 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fc41cd9e0d9
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fc41db8e028 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007fc41d025fa0 RCX: 00007fc41cd9e0d9
RDX: 0000000000000001 RSI: 00002000000000c0 RDI: 0000000000000003
RBP: 00007fc41ce35024 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fc41d026038 R14: 00007fc41d025fa0 R15: 00007ffc43904ea8
</TASK>
----------------
Code disassembly (best guess):
0: 8b 43 38 mov 0x38(%rbx),%eax
3: 48 39 c5 cmp %rax,%rbp
6: 75 16 jne 0x1e
8: e8 eb 42 45 fc call 0xfc4542f8
d: 48 83 c4 08 add $0x8,%rsp
11: 5b pop %rbx
12: 5d pop %rbp
13: 41 5c pop %r12
15: 41 5d pop %r13
17: 41 5e pop %r14
19: c3 ret
1a: cc int3
1b: cc int3
1c: cc int3
1d: cc int3
1e: e8 d5 42 45 fc call 0xfc4542f8
23: 48 8d 3d 0e 72 68 0b lea 0xb68720e(%rip),%rdi # 0xb687238
* 2a: 67 48 0f b9 3a ud1 (%edx),%rdi <-- trapping instruction
2f: 48 c7 c0 e0 c3 46 8e mov $0xffffffff8e46c3e0,%rax
36: 48 ba 00 00 00 00 00 movabs $0xdffffc0000000000,%rdx
3d: fc ff df
Tested on:
commit: f04461ee drm/virtio: clear host-visible mappings befor..
git tree: https://github.com/yutao-intel/linux.git fix-dri-virtio-align-HEAD
console output: https://syzkaller.appspot.com/x/log.txt?x=101a7549580000
kernel config: https://syzkaller.appspot.com/x/.config?x=acc0a882b963ae23
dashboard link: https://syzkaller.appspot.com/bug?extid=d93b9064fe5f74af3aa3
compiler: gcc (Debian 14.2.0-19) 14.2.0, GNU ld (GNU Binutils for Debian) 2.44
Note: no patches were applied.
^ permalink raw reply [flat|nested] 10+ messages in thread
end of thread, other threads:[~2026-08-25 6:23 UTC | newest]
Thread overview: 10+ messages (download: mbox.gz follow: Atom feed
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2026-08-24 6:36 ` [syzbot] [dri?] WARNING in drm_mm_takedown syzbot
[not found] <30a3accb-d060-4a00-86da-d4e4c9ea7dcfn@googlegroups.com>
2026-08-25 6:23 ` syzbot
[not found] <97cf567b-b9a9-4256-8cc8-854c0a0dc4c5n@googlegroups.com>
2026-08-25 5:26 ` syzbot
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2026-08-25 4:51 ` syzbot
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2026-08-25 3:44 ` syzbot
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2026-08-25 3:19 ` syzbot
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2026-08-24 7:44 ` syzbot
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2026-08-09 20:57 ` syzbot
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