ci2 starts bisection 2026-09-30 11:19:27.22303807 +0000 UTC m=+19669.634520550
bisecting fixing commit since 6e2fd6534337574c1b553646a7e0c9cc641c0494
building syzkaller on e611ffe1caa28a0228c8f3642cc768f0dba3dd0c
ensuring issue is reproducible on original commit 6e2fd6534337574c1b553646a7e0c9cc641c0494

testing commit 6e2fd6534337574c1b553646a7e0c9cc641c0494 gcc
compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.44
kernel signature: 60fee76e281e2c1876165ccad7d1b8f49624800d9bd12684167f10f1bce2bc77
all runs: crashed: WARNING in virtio_dev_remove
representative crash: WARNING in virtio_dev_remove, types: [WARNING]
check whether we can drop unnecessary instrumentation
disabling configs for [hang memleak ubsan kasan locking atomic_sleep], they are not needed
testing commit 6e2fd6534337574c1b553646a7e0c9cc641c0494 gcc
compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.44
kernel signature: e0fd77f9883e6fc95bab1fe06bceb3249920b5e6bbef7548bb48fb00954c7653
all runs: crashed: WARNING in virtio_dev_remove
representative crash: WARNING in virtio_dev_remove, types: [WARNING]
the bug reproduces without the instrumentation
disabling configs for [atomic_sleep hang memleak ubsan kasan locking], they are not needed
kconfig minimization: base=3707 full=7427 leaves diff=2100
split chunks (needed=false): <2100>
split chunk #0 of len 2100 into 5 parts
testing without sub-chunk 1/5
disabling configs for [memleak ubsan kasan locking atomic_sleep hang], they are not needed
testing commit 6e2fd6534337574c1b553646a7e0c9cc641c0494 gcc
compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.44
kernel signature: fddd4c15f56f08ce6af807f4e25c06bf9e50aeaea667e0ca173dfe1d51683ae6
all runs: crashed: WARNING in virtio_dev_remove
representative crash: WARNING in virtio_dev_remove, types: [WARNING]
the chunk can be dropped
testing without sub-chunk 2/5
disabling configs for [kasan locking atomic_sleep hang memleak ubsan], they are not needed
testing commit 6e2fd6534337574c1b553646a7e0c9cc641c0494 gcc
compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.44
kernel signature: e2d2e0df36cfda59e9bf7d618292281c9cb9db9061ed951e8bdc729a4b99e69d
all runs: crashed: WARNING in virtio_dev_remove
representative crash: WARNING in virtio_dev_remove, types: [WARNING]
the chunk can be dropped
testing without sub-chunk 3/5
disabling configs for [kasan locking atomic_sleep hang memleak ubsan], they are not needed
testing commit 6e2fd6534337574c1b553646a7e0c9cc641c0494 gcc
compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.44
kernel signature: 20e2e01cf013a05246109a87492569422b049136f9ebd60cd29897db8c2c7226
all runs: crashed: WARNING in virtio_dev_remove
representative crash: WARNING in virtio_dev_remove, types: [WARNING]
the chunk can be dropped
testing without sub-chunk 4/5
disabling configs for [kasan locking atomic_sleep hang memleak ubsan], they are not needed
testing commit 6e2fd6534337574c1b553646a7e0c9cc641c0494 gcc
compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.44
kernel signature: dca4218b9c2923548a7853d4f8989de2a2a9524610bb6661c7b955e7f8c8eb7f
all runs: crashed: WARNING in virtio_dev_remove
representative crash: WARNING in virtio_dev_remove, types: [WARNING]
the chunk can be dropped
testing without sub-chunk 5/5
disabling configs for [kasan locking atomic_sleep hang memleak ubsan], they are not needed
testing commit 6e2fd6534337574c1b553646a7e0c9cc641c0494 gcc
compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.44
kernel signature: d8e494c13d6e788b02d3e218a89a39a27d3993cf73c0945ce543858dca52b0eb
all runs: crashed: WARNING in virtio_dev_remove
representative crash: WARNING in virtio_dev_remove, types: [WARNING]
the chunk can be dropped
disabling configs for [hang memleak ubsan kasan locking atomic_sleep], they are not needed
testing current HEAD 0248c33e835ecbec3a591f93fdaae53f7b90a4d6
testing commit 0248c33e835ecbec3a591f93fdaae53f7b90a4d6 gcc
compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.44
kernel signature: 5ca7ddbcfdfe4edee6183293924adee2f70ae9ee795e25fa6f8ad33f16a8e4f4
all runs: crashed: WARNING in virtio_dev_remove
representative crash: WARNING in virtio_dev_remove, types: [WARNING]
crash still not fixed/happens on the oldest tested release
revisions tested: 8, total time: 1h35m23.552380281s (build: 33m11.322878419s, test: 53m19.870889915s)
crash still not fixed or there were kernel test errors
commit msg: Linux 5.15.221
crash: WARNING in virtio_dev_remove
------------[ cut here ]------------
WARNING: CPU: 0 PID: 2580 at drivers/virtio/virtio.c:303 virtio_add_status drivers/virtio/virtio.c:165 [inline]
WARNING: CPU: 0 PID: 2580 at drivers/virtio/virtio.c:303 virtio_dev_remove+0x6f/0x80 drivers/virtio/virtio.c:306
Modules linked in:
CPU: 0 PID: 2580 Comm: syz.3.17 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/16/2026
RIP: 0010:virtio_dev_remove+0x6f/0x80 drivers/virtio/virtio.c:303
Code: 18 84 c0 75 25 48 8b 83 a8 04 00 00 48 89 ef 48 8b 58 20 ff 50 18 48 89 ef 83 c8 01 0f b6 f0 48 89 d8 5b 5d 41 5c 41 5d ff e0 <0f> 0b eb d7 66 66 2e 0f 1f 84 00 00 00 00 00 66 90 f6 87 54 05 00
RSP: 0018:ffffc900021ffc40 EFLAGS: 00010286
RAX: 00000000000000ff RBX: ffff888105b9a088 RCX: 0000000082000165
RDX: 000000000000c052 RSI: 0000000000000001 RDI: 000000000001c052
RBP: ffff888105b9a000 R08: 0000000000000000 R09: ffffffff814bc100
R10: ffffea000412ee20 R11: 0000000000000001 R12: ffff888105b9a008
R13: ffffffff828265a0 R14: ffffc900021ffe80 R15: ffff888109997220
FS:  00007f67855ef6c0(0000) GS:ffff888237c00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000558d3a2c4950 CR3: 000000010becc000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 __device_release_driver+0x178/0x250 drivers/base/dd.c:1247
 device_release_driver_internal drivers/base/dd.c:1282 [inline]
 device_release_driver+0x21/0x30 drivers/base/dd.c:1305
 bus_remove_device+0xe7/0x150 drivers/base/bus.c:531
 device_del+0x186/0x400 drivers/base/core.c:3615
 device_unregister+0xe/0x60 drivers/base/core.c:3660
 unregister_virtio_device+0xf/0x20 drivers/virtio/virtio.c:449
 virtio_pci_remove+0x33/0x70 drivers/virtio/virtio_pci_common.c:589
 pci_device_remove+0x34/0x90 drivers/pci/pci-driver.c:471
 __device_release_driver+0x178/0x250 drivers/base/dd.c:1247
 device_release_driver_internal drivers/base/dd.c:1282 [inline]
 device_release_driver+0x21/0x30 drivers/base/dd.c:1305
 pci_stop_dev drivers/pci/remove.c:23 [inline]
 pci_stop_bus_device+0x63/0x80 drivers/pci/remove.c:83
 pci_stop_and_remove_bus_device drivers/pci/remove.c:117 [inline]
 pci_stop_and_remove_bus_device_locked+0x11/0x20 drivers/pci/remove.c:125
 remove_store+0x70/0x80 drivers/pci/pci-sysfs.c:494
 kernfs_fop_write_iter+0x14f/0x200 fs/kernfs/file.c:296
 call_write_iter include/linux/fs.h:2179 [inline]
 new_sync_write+0x114/0x1a0 fs/read_write.c:507
 vfs_write+0x20b/0x2a0 fs/read_write.c:594
 ksys_write+0x63/0xe0 fs/read_write.c:647
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x33/0x90 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7f678578e019
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:00007f67855ef028 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f6785a15fa0 RCX: 00007f678578e019
RDX: 0000000000000001 RSI: 0000200000000200 RDI: 0000000000000004
RBP: 00007f678582500c R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f6785a16038 R14: 00007f6785a15fa0 R15: 00007fffcd5b31c8
 </TASK>