WARNING in virtio_dev_remove

Status: upstream: reported on 2026/08/03 08:22
Reported-by: syzbot+3d4ccbae115fec137424@syzkaller.appspotmail.com
First crash: 20h33m, last: 19h29m
Similar bugs (4)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-6.1 WARNING in virtio_dev_remove origin:upstream -1 syz, C 6 22h53m 3d22h 0/3 upstream: reported C repro on 2026/07/31 06:23
upstream WARNING in virtio_dev_remove virt prio:low -1 syz, C error 17 1d04h 3d04h 0/29 upstream: reported C repro on 2026/08/01 00:00
linux-5.15 WARNING in virtio_dev_remove -1 syz, C 3 1d05h 1d06h 0/3 upstream: reported C repro on 2026/08/02 22:27
android-6-12 WARNING in virtio_dev_remove -1 syz, C 4 4d17h 4d18h 0/1 premoderation: reported C repro on 2026/07/30 10:31

Sample crash report:
------------[ cut here ]------------
WARNING: CPU: 1 PID: 5860 at drivers/virtio/virtio.c:335 virtio_dev_remove+0x173/0x1a0 drivers/virtio/virtio.c:335
Modules linked in:
CPU: 1 PID: 5860 Comm: syz.3.6 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
RIP: 0010:virtio_dev_remove+0x173/0x1a0 drivers/virtio/virtio.c:335
Code: 08 48 89 df e8 1e 02 44 fd 4c 89 f7 ff 13 0c 01 0f b6 f0 4c 89 f7 4c 89 e0 5b 41 5c 41 5d 41 5e 41 5f 5d ff e0 e8 ad 84 eb fc <0f> 0b e9 78 ff ff ff 44 89 e9 80 e1 07 38 c1 0f 8c d8 fe ff ff 4c
RSP: 0018:ffffc90004a7f858 EFLAGS: 00010246
RAX: ffffffff849bea73 RBX: ffff88801b373548 RCX: 0000000000080000
RDX: ffffc9000d74c000 RSI: 000000000007ffff RDI: 0000000000080000
RBP: 00000000000000ff R08: ffffffff911eb537 R09: 1ffffffff223d6a6
R10: dffffc0000000000 R11: fffffbfff223d6a7 R12: 1ffff1100366e6a9
R13: dffffc0000000000 R14: ffff88801b373000 R15: ffffffff8b28b378
FS:  00007f9f92e866c0(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fca1ffeb700 CR3: 000000001e78a000 CR4: 00000000003506e0
Call Trace:
 <TASK>
 device_remove drivers/base/dd.c:626 [inline]
 __device_release_driver drivers/base/dd.c:1351 [inline]
 device_release_driver_internal+0x408/0x6f0 drivers/base/dd.c:1374
 bus_remove_device+0x43b/0x520 drivers/base/bus.c:624
 device_del+0x51f/0x910 drivers/base/core.c:3889
 device_unregister+0x20/0xc0 drivers/base/core.c:3930
 unregister_virtio_device+0x37/0x60 drivers/virtio/virtio.c:483
 virtio_pci_remove+0x7f/0xf0 drivers/virtio/virtio_pci_common.c:598
 pci_device_remove+0x97/0x230 drivers/pci/pci-driver.c:483
 device_remove drivers/base/dd.c:626 [inline]
 __device_release_driver drivers/base/dd.c:1351 [inline]
 device_release_driver_internal+0x408/0x6f0 drivers/base/dd.c:1374
 pci_stop_dev drivers/pci/remove.c:22 [inline]
 pci_stop_bus_device+0x108/0x140 drivers/pci/remove.c:84
 pci_stop_and_remove_bus_device drivers/pci/remove.c:118 [inline]
 pci_stop_and_remove_bus_device_locked+0x1a/0x30 drivers/pci/remove.c:126
 remove_store+0xe6/0x150 drivers/pci/pci-sysfs.c:515
 kernfs_fop_write_iter+0x3a4/0x520 fs/kernfs/file.c:352
 call_write_iter include/linux/fs.h:2018 [inline]
 new_sync_write fs/read_write.c:491 [inline]
 vfs_write+0x474/0x9a0 fs/read_write.c:584
 ksys_write+0x151/0x260 fs/read_write.c:637
 do_syscall_x64 arch/x86/entry/common.c:46 [inline]
 do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:76
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f9f91f9e019
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:00007f9f92e86028 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f9f92225fa0 RCX: 00007f9f91f9e019
RDX: 0000000000000001 RSI: 0000200000000200 RDI: 000000000000000a
RBP: 00007f9f9203500c R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f9f92226038 R14: 00007f9f92225fa0 R15: 00007ffef959e6e8
 </TASK>

Crashes (4):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/08/03 09:25 linux-6.6.y a1153c0deb44 e611ffe1 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in virtio_dev_remove
2026/08/03 09:22 linux-6.6.y a1153c0deb44 e611ffe1 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in virtio_dev_remove
2026/08/03 08:24 linux-6.6.y a1153c0deb44 e611ffe1 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in virtio_dev_remove
2026/08/03 08:21 linux-6.6.y a1153c0deb44 e611ffe1 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in virtio_dev_remove
* Struck through repros no longer work on HEAD.