Re: [syzbot] [dri?] WARNING in drm_mm_takedown

[syzbot <syzbot+d93b9064fe5f74af3aa3@syzkaller.appspotmail.com>]

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.