* [syzbot] [kernel?] WARNING: ODEBUG bug in vub300_disconnect
@ 2026-08-25 1:37 syzbot
2026-09-11 1:36 ` [syzbot] [mmc?] " syzbot
0 siblings, 1 reply; 2+ messages in thread
From: syzbot @ 2026-08-25 1:37 UTC (permalink / raw)
To: linux-kernel, linux-mmc, syzkaller-bugs, ulfh
Hello,
syzbot found the following issue on:
HEAD commit: 0a0d1d55dad5 Merge tag 'scftorture.2026.08.18a' of git://g..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=126be415580000
kernel config: https://syzkaller.appspot.com/x/.config?x=335632b21d0ce540
dashboard link: https://syzkaller.appspot.com/bug?extid=f4a0159ce6802a0a4774
compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8
Unfortunately, I don't have any reproducer for this issue yet.
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/b00b3ccadcaf/disk-0a0d1d55.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/0e672b557a64/vmlinux-0a0d1d55.xz
kernel image: https://storage.googleapis.com/syzbot-assets/b5c1ac823fac/bzImage-0a0d1d55.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+f4a0159ce6802a0a4774@syzkaller.appspotmail.com
------------[ cut here ]------------
ODEBUG: free active (active state 0) object: ffff888077279270 object type: timer_list hint: vub300_inactivity_timer_expired+0x0/0x3f0 include/linux/refcount.h:-1
WARNING: lib/debugobjects.c:632 at debug_print_object+0xec/0x230 lib/debugobjects.c:629, CPU#0: kworker/0:1/10
Modules linked in:
CPU: 0 UID: 0 PID: 10 Comm: kworker/0:1 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/16/2026
Workqueue: usb_hub_wq hub_event
RIP: 0010:debug_print_object+0x18a/0x230 lib/debugobjects.c:629
Code: f8 48 c1 e8 03 80 3c 18 00 74 08 4c 89 ff e8 5d 6f 4f fd 4d 8b 0f 4c 89 ef 48 8b 74 24 08 48 89 ea 44 89 e1 4d 89 f0 ff 34 24 <67> 48 0f b9 3a 48 83 c4 08 ff 05 53 75 92 0b 48 83 c4 10 5b 41 5c
RSP: 0018:ffffc900000f7218 EFLAGS: 00010246
RAX: 1ffffffff181ede4 RBX: dffffc0000000000 RCX: 0000000000000000
RDX: ffffffff8c6d6340 RSI: ffffffff8c6d5dc0 RDI: ffffffff9084da30
RBP: ffffffff8c6d6340 R08: ffff888077279270 R09: ffffffff8c0f8280
R10: dffffc0000000000 R11: ffffffff81b32b80 R12: 0000000000000000
R13: ffffffff9084da30 R14: ffff888077279270 R15: ffffffff8c0f6f20
FS: 0000000000000000(0000) GS:ffff888124cf3000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f5b6cbceff8 CR3: 000000000eb46000 CR4: 0000000000350ef0
Call Trace:
<TASK>
__debug_check_no_obj_freed lib/debugobjects.c:1171 [inline]
debug_check_no_obj_freed+0x2e3/0x450 lib/debugobjects.c:1201
slab_free_hook mm/slub.c:2609 [inline]
slab_free mm/slub.c:6372 [inline]
kfree+0x13e/0x640 mm/slub.c:6687
device_release+0xc4/0x1f0 drivers/base/core.c:-1
kobject_cleanup lib/kobject.c:689 [inline]
kobject_release lib/kobject.c:720 [inline]
kref_put include/linux/kref.h:65 [inline]
kobject_put+0x222/0x550 lib/kobject.c:737
vub300_delete drivers/mmc/host/vub300.c:379 [inline]
kref_put include/linux/kref.h:65 [inline]
vub300_disconnect+0x280/0x2f0 drivers/mmc/host/vub300.c:2388
usb_unbind_interface+0x295/0x9f0 drivers/usb/core/driver.c:458
device_remove drivers/base/dd.c:618 [inline]
__device_release_driver drivers/base/dd.c:1349 [inline]
device_release_driver_internal+0x4f5/0x880 drivers/base/dd.c:1372
bus_remove_device+0x444/0x560 drivers/base/bus.c:664
device_del+0x524/0x8f0 drivers/base/core.c:3965
usb_disable_device+0x3d4/0x8d0 drivers/usb/core/message.c:1478
usb_disconnect+0x346/0x9a0 drivers/usb/core/hub.c:2345
hub_port_connect drivers/usb/core/hub.c:5415 [inline]
hub_port_connect_change drivers/usb/core/hub.c:5715 [inline]
port_event drivers/usb/core/hub.c:5879 [inline]
hub_event+0x1bbb/0x4d30 drivers/usb/core/hub.c:5961
process_one_work kernel/workqueue.c:3387 [inline]
process_scheduled_works+0xc3d/0x1630 kernel/workqueue.c:3470
worker_thread+0xa47/0xfb0 kernel/workqueue.c:3551
kthread+0x38b/0x480 kernel/kthread.c:436
ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
</TASK>
----------------
Code disassembly (best guess):
0: f8 clc
1: 48 c1 e8 03 shr $0x3,%rax
5: 80 3c 18 00 cmpb $0x0,(%rax,%rbx,1)
9: 74 08 je 0x13
b: 4c 89 ff mov %r15,%rdi
e: e8 5d 6f 4f fd call 0xfd4f6f70
13: 4d 8b 0f mov (%r15),%r9
16: 4c 89 ef mov %r13,%rdi
19: 48 8b 74 24 08 mov 0x8(%rsp),%rsi
1e: 48 89 ea mov %rbp,%rdx
21: 44 89 e1 mov %r12d,%ecx
24: 4d 89 f0 mov %r14,%r8
27: ff 34 24 push (%rsp)
* 2a: 67 48 0f b9 3a ud1 (%edx),%rdi <-- trapping instruction
2f: 48 83 c4 08 add $0x8,%rsp
33: ff 05 53 75 92 0b incl 0xb927553(%rip) # 0xb92758c
39: 48 83 c4 10 add $0x10,%rsp
3d: 5b pop %rbx
3e: 41 5c pop %r12
---
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] 2+ messages in thread
* Re: [syzbot] [mmc?] WARNING: ODEBUG bug in vub300_disconnect
2026-08-25 1:37 [syzbot] [kernel?] WARNING: ODEBUG bug in vub300_disconnect syzbot
@ 2026-09-11 1:36 ` syzbot
0 siblings, 0 replies; 2+ messages in thread
From: syzbot @ 2026-09-11 1:36 UTC (permalink / raw)
To: cjb, dakr, driver-core, gregkh, johan, lgs201920130244,
linux-kernel, linux-mmc, rafael, runyu.xiao, syzkaller-bugs,
tony.olech, ulf.hansson, ulfh, yogeshgaur.83
syzbot has found a reproducer for the following issue on:
HEAD commit: 50d05c7c76c9 Merge tag 'landlock-7.3-rc3' of git://git.ker..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=142f5615580000
kernel config: https://syzkaller.appspot.com/x/.config?x=85bc5cc2fc7394d9
dashboard link: https://syzkaller.appspot.com/bug?extid=f4a0159ce6802a0a4774
compiler: gcc (Debian 14.2.0-19) 14.2.0, GNU ld (GNU Binutils for Debian) 2.44
userspace arch: i386
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=122f5615580000
Downloadable assets:
disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/d900f083ada3/non_bootable_disk-50d05c7c.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/303a0ade8f9e/vmlinux-50d05c7c.xz
kernel image: https://storage.googleapis.com/syzbot-assets/70b8ca71442b/bzImage-50d05c7c.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+f4a0159ce6802a0a4774@syzkaller.appspotmail.com
------------[ cut here ]------------
ODEBUG: free active (active state 0) object: ffff888014529270 object type: timer_list hint: vub300_inactivity_timer_expired+0x0/0x550 drivers/mmc/host/vub300.c:1447
WARNING: lib/debugobjects.c:629 at debug_print_object+0x198/0x2b0 lib/debugobjects.c:629, CPU#1: kworker/1:4/6022
Modules linked in:
CPU: 1 UID: 0 PID: 6022 Comm: kworker/1:4 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
Workqueue: usb_hub_wq hub_event
RIP: 0010:debug_print_object+0x1a5/0x2b0 lib/debugobjects.c:629
Code: b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 75 4f 48 8d 3d 88 ce 1d 0c 41 56 48 8b 14 ed 40 3e 62 8c 4c 89 e6 <67> 48 0f b9 3a 58 83 05 e2 00 13 0c 01 48 83 c4 18 5b 5d 41 5c 41
RSP: 0000:ffffc900039d73c8 EFLAGS: 00010246
RAX: dffffc0000000000 RBX: ffffc900039d74b0 RCX: 0000000000000000
RDX: ffffffff8c623d80 RSI: ffffffff8c623920 RDI: ffffffff91505580
RBP: 0000000000000003 R08: ffff888014529270 R09: ffffffff8bf31160
R10: 0000000000000001 R11: 0000000000000000 R12: ffffffff8c623920
R13: ffffffff8bf311a0 R14: ffffffff88c79960 R15: ffffc900039d74c8
FS: 0000000000000000(0000) GS:ffff888096a60000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000000361bf60 CR3: 000000004fa35000 CR4: 0000000000352ef0
Call Trace:
<TASK>
__debug_check_no_obj_freed lib/debugobjects.c:1171 [inline]
debug_check_no_obj_freed+0x4da/0x630 lib/debugobjects.c:1201
slab_free_hook mm/slub.c:2679 [inline]
slab_free mm/slub.c:6499 [inline]
kfree+0x3d6/0x6d0 mm/slub.c:6792
device_release+0xd2/0x270 drivers/base/core.c:2640
kobject_cleanup lib/kobject.c:689 [inline]
kobject_release lib/kobject.c:720 [inline]
kref_put include/linux/kref.h:65 [inline]
kobject_put+0x1f7/0x640 lib/kobject.c:737
put_device+0x1f/0x30 drivers/base/core.c:3884
vub300_delete drivers/mmc/host/vub300.c:379 [inline]
kref_put.constprop.0.isra.0+0x159/0x1d0 include/linux/kref.h:65
vub300_disconnect+0x136/0x170 drivers/mmc/host/vub300.c:2388
usb_unbind_interface+0x1dd/0x9e0 drivers/usb/core/driver.c:461
device_remove drivers/base/dd.c:618 [inline]
device_remove+0x12a/0x180 drivers/base/dd.c:610
__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:3965
usb_disable_device+0x367/0x810 drivers/usb/core/message.c:1478
usb_disconnect+0x2e2/0x9a0 drivers/usb/core/hub.c:2350
hub_port_connect drivers/usb/core/hub.c:5420 [inline]
hub_port_connect_change drivers/usb/core/hub.c:5720 [inline]
port_event drivers/usb/core/hub.c:5884 [inline]
hub_event+0x1bb1/0x4420 drivers/usb/core/hub.c:5966
process_one_work+0xac7/0x1b10 kernel/workqueue.c:3396
process_scheduled_works kernel/workqueue.c:3479 [inline]
worker_thread+0x5ef/0xe50 kernel/workqueue.c:3560
kthread+0x373/0x450 kernel/kthread.c:436
ret_from_fork+0x730/0xd60 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
</TASK>
----------------
Code disassembly (best guess):
0: b8 00 00 00 00 mov $0x0,%eax
5: 00 fc add %bh,%ah
7: ff lcall (bad)
8: df 48 89 fisttps -0x77(%rax)
b: fa cli
c: 48 c1 ea 03 shr $0x3,%rdx
10: 80 3c 02 00 cmpb $0x0,(%rdx,%rax,1)
14: 75 4f jne 0x65
16: 48 8d 3d 88 ce 1d 0c lea 0xc1dce88(%rip),%rdi # 0xc1dcea5
1d: 41 56 push %r14
1f: 48 8b 14 ed 40 3e 62 mov -0x739dc1c0(,%rbp,8),%rdx
26: 8c
27: 4c 89 e6 mov %r12,%rsi
* 2a: 67 48 0f b9 3a ud1 (%edx),%rdi <-- trapping instruction
2f: 58 pop %rax
30: 83 05 e2 00 13 0c 01 addl $0x1,0xc1300e2(%rip) # 0xc130119
37: 48 83 c4 18 add $0x18,%rsp
3b: 5b pop %rbx
3c: 5d pop %rbp
3d: 41 5c pop %r12
3f: 41 rex.B
---
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] 2+ messages in thread
end of thread, other threads:[~2026-09-11 1:36 UTC | newest]
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2026-08-25 1:37 [syzbot] [kernel?] WARNING: ODEBUG bug in vub300_disconnect syzbot
2026-09-11 1:36 ` [syzbot] [mmc?] " syzbot
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