syzbot


WARNING in pci_scan_single_device (2)

Status: upstream: reported on 2026/01/21 00:08
Subsystems: pci
[Documentation on labels]
Reported-by: syzbot+87bb32e345aa80c0554b@syzkaller.appspotmail.com
First crash: 79d, last: 13d
Discussions (1)
Title Replies (including bot) Last reply
[syzbot] [pci?] WARNING in pci_scan_single_device (2) 0 (1) 2026/01/21 00:08
Similar bugs (1)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream WARNING in pci_scan_single_device pci -1 1 312d 307d 0/29 auto-obsoleted due to no activity on 2025/09/06 17:08

Sample crash report:
 </TASK>
------------[ cut here ]------------
ret < 0
WARNING: drivers/pci/probe.c:2769 at pci_device_add+0x133b/0x1810 drivers/pci/probe.c:2769, CPU#0: syz.1.4209/23707
Modules linked in:
CPU: 0 UID: 0 PID: 23707 Comm: syz.1.4209 Tainted: G     U       L      syzkaller #0 PREEMPT(full) 
Tainted: [U]=USER, [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
RIP: 0010:pci_device_add+0x133b/0x1810 drivers/pci/probe.c:2769
Code: e5 04 83 e0 8f 09 e8 88 83 c8 00 00 00 e9 28 f4 ff ff e8 a8 0f d7 fc 90 0f 0b 90 90 0f 0b 90 e9 0e f7 ff ff e8 96 0f d7 fc 90 <0f> 0b 90 e9 7e fa ff ff e8 88 0f d7 fc 90 0f 0b 90 e9 11 fa ff ff
RSP: 0018:ffffc90004db7910 EFLAGS: 00010283
RAX: 0000000000027073 RBX: 00000000fffffff4 RCX: ffffc900064f9000
RDX: 0000000000080000 RSI: ffffffff85311d8a RDI: ffff888036fddb80
RBP: ffff88801ba90400 R08: 0000000000000005 R09: 0000000000000000
R10: 00000000fffffff4 R11: 00000000000028f0 R12: ffff888022e87028
R13: ffff888022e87000 R14: 0000000000000001 R15: ffff888022efa000
FS:  00007f31e1aea6c0(0000) GS:ffff888124346000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffb2715f040 CR3: 000000009dfba000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 pci_scan_single_device drivers/pci/probe.c:2793 [inline]
 pci_scan_single_device+0x1d0/0x240 drivers/pci/probe.c:2779
 pci_scan_slot+0x1c9/0x7c0 drivers/pci/probe.c:2876
 pci_scan_child_bus_extend+0x6b/0x7b0 drivers/pci/probe.c:3095
 pci_scan_child_bus drivers/pci/probe.c:3208 [inline]
 pci_rescan_bus+0x18/0x40 drivers/pci/probe.c:3499
 bus_rescan_store+0x15f/0x1d0 drivers/pci/pci-sysfs.c:543
 dev_attr_store+0x58/0x80 drivers/base/core.c:2437
 sysfs_kf_write+0xf2/0x150 fs/sysfs/file.c:142
 kernfs_fop_write_iter+0x3e0/0x5f0 fs/kernfs/file.c:352
 new_sync_write fs/read_write.c:595 [inline]
 vfs_write+0x6ac/0x1070 fs/read_write.c:688
 ksys_write+0x12a/0x250 fs/read_write.c:740
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x106/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f31e0b9c799
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:00007f31e1aea028 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f31e0e15fa0 RCX: 00007f31e0b9c799
RDX: 0000000000000006 RSI: 0000000000000000 RDI: 0000000000000004
RBP: 00007f31e0c32c99 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f31e0e16038 R14: 00007f31e0e15fa0 R15: 00007ffe652f3e68
 </TASK>

Crashes (2):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/03/24 04:02 upstream c369299895a5 baf8bf12 .config console log report info [disk image] [vmlinux] [kernel image] ci-qemu-gce-upstream-auto WARNING in pci_scan_single_device
2026/01/17 00:04 upstream 983d014aafb1 d1b870e1 .config console log report info [disk image] [vmlinux] [kernel image] ci-qemu-gce-upstream-auto WARNING in pci_scan_single_device
* Struck through repros no longer work on HEAD.