syzbot


WARNING in __cfg80211_bss_update (2)

Status: upstream: reported C repro on 2024/07/09 00:36
Subsystems: wireless
[Documentation on labels]
Reported-by: syzbot+1a797e1c81be78a2ace7@syzkaller.appspotmail.com
First crash: 539d, last: 1d03h
Cause bisection: the issue happens on the oldest tested release (bisect log)
Crash: WARNING in cfg80211_bss_update (log)
Repro: C syz .config
  
Discussions (1)
Title Replies (including bot) Last reply
[syzbot] [wireless?] WARNING in __cfg80211_bss_update (2) 0 (2) 2024/07/17 08:55
Similar bugs (1)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream WARNING in __cfg80211_bss_update wireless -1 1 764d 760d 0/29 auto-obsoleted due to no activity on 2024/03/02 19:52
Last patch testing requests (10)
Created Duration User Patch Repo Result
2025/12/25 22:30 29m retest repro net report log
2025/12/11 21:56 18m retest repro net-next report log
2025/11/27 20:17 18m retest repro upstream report log
2025/11/13 08:26 12m retest repro upstream report log
2025/10/21 08:29 21m retest repro git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci report log
2025/10/06 14:42 17m retest repro net report log
2025/09/22 14:03 16m retest repro net-next report log
2025/09/08 13:00 45m retest repro upstream report log
2025/08/25 08:36 13m retest repro upstream report log
2025/08/11 08:07 19m retest repro git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci report log
Fix bisection attempts (1)
Created Duration User Patch Repo Result
2025/02/10 13:36 2h55m bisect fix upstream OK (0) job log log

Sample crash report:
------------[ cut here ]------------
WARNING: net/wireless/scan.c:1788 at cfg80211_combine_bsses net/wireless/scan.c:1788 [inline], CPU#0: ksoftirqd/0/15
WARNING: net/wireless/scan.c:1788 at __cfg80211_bss_update+0x1ca9/0x2380 net/wireless/scan.c:2035, CPU#0: ksoftirqd/0/15
Modules linked in:
CPU: 0 UID: 0 PID: 15 Comm: ksoftirqd/0 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:cfg80211_combine_bsses net/wireless/scan.c:1788 [inline]
RIP: 0010:__cfg80211_bss_update+0x1ca9/0x2380 net/wireless/scan.c:2035
Code: 00 00 00 48 85 db 0f 85 0c fe ff ff e9 4a fe ff ff e8 0b b5 f6 f6 48 8d 7b 98 e8 d2 64 ff ff e9 a8 fe ff ff e8 f8 b4 f6 f6 90 <0f> 0b 90 48 8b 7c 24 40 e8 8a b2 ec f9 31 ff 89 c6 88 44 24 60 e8
RSP: 0018:ffffc900001471d8 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 0000000000000002 RCX: ffffffff8ac828be
RDX: ffff88801d6e4980 RSI: ffffffff8ac83178 RDI: 0000000000000005
RBP: ffff88807bae4468 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000030000 R12: ffff888031470190
R13: ffff88807bae4400 R14: ffff888025f8fc00 R15: dffffc0000000000
FS:  0000000000000000(0000) GS:ffff8881248f5000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000c00774a000 CR3: 000000007abee000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 cfg80211_inform_single_bss_data+0x7b9/0x1d30 net/wireless/scan.c:2369
 cfg80211_inform_bss_data+0x22b/0x3be0 net/wireless/scan.c:3228
 cfg80211_inform_bss_frame_data+0x26f/0x720 net/wireless/scan.c:3319
 ieee80211_bss_info_update+0x310/0xab0 net/mac80211/scan.c:230
 ieee80211_scan_rx+0x4cf/0xb30 net/mac80211/scan.c:359
 __ieee80211_rx_handle_packet net/mac80211/rx.c:5282 [inline]
 ieee80211_rx_list+0x1c40/0x2ed0 net/mac80211/rx.c:5539
 ieee80211_rx_napi+0xdc/0x410 net/mac80211/rx.c:5562
 ieee80211_rx include/net/mac80211.h:5216 [inline]
 ieee80211_handle_queued_frames+0xcf/0x130 net/mac80211/main.c:452
 tasklet_action_common+0x254/0x3f0 kernel/softirq.c:925
 handle_softirqs+0x219/0x950 kernel/softirq.c:622
 run_ksoftirqd kernel/softirq.c:1063 [inline]
 run_ksoftirqd+0x3a/0x60 kernel/softirq.c:1055
 smpboot_thread_fn+0x3f7/0xae0 kernel/smpboot.c:160
 kthread+0x3c5/0x780 kernel/kthread.c:463
 ret_from_fork+0x983/0xb10 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246
 </TASK>

Crashes (17):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2025/12/26 08:03 upstream ccd1cdca5cd4 d6526ea3 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root WARNING in __cfg80211_bss_update
2024/12/24 23:36 upstream 9b2ffa6148b1 444551c4 .config strace log report syz / log C [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce WARNING in __cfg80211_bss_update
2025/03/22 22:33 upstream 88d324e69ea9 c6512ef7 .config console log report syz / log C [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream WARNING in __cfg80211_bss_update
2024/12/16 11:06 net 922b4b955a03 7cbfbb3a .config strace log report syz / log C [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce WARNING in __cfg80211_bss_update
2024/07/17 08:54 net-next 58f9416d413a 215bec2d .config strace log report syz / log C [disk image] [vmlinux] [kernel image] ci2-upstream-net-next-test-gce WARNING in __cfg80211_bss_update
2025/02/28 21:22 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 017f704fbfb1 1e7a43e1 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 WARNING in __cfg80211_bss_update
2025/10/30 08:16 upstream e53642b87a4f fd2207e7 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root WARNING in __cfg80211_bss_update
2024/12/12 09:56 upstream 231825b2e1ff ff949d25 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root WARNING in __cfg80211_bss_update
2024/12/04 10:17 upstream ceb8bf2ceaa7 b50eb251 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-badwrites-root WARNING in __cfg80211_bss_update
2024/08/30 18:58 upstream 20371ba12063 f885a8ff .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce WARNING in __cfg80211_bss_update
2024/07/14 21:00 upstream 4d145e3f830b eaeb5c15 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root WARNING in __cfg80211_bss_update
2024/07/06 01:54 upstream d270dd21bee0 2a40360c .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce WARNING in __cfg80211_bss_update
2024/07/27 00:22 upstream 2f8c4f506285 46eb10b7 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 WARNING in __cfg80211_bss_update
2025/05/16 09:33 net ef935650e044 cfde8269 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce WARNING in __cfg80211_bss_update
2024/07/22 17:14 net-next 58f9416d413a df655b64 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-net-next-test-gce WARNING in __cfg80211_bss_update
2024/07/17 07:37 net-next 58f9416d413a 215bec2d .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-net-next-test-gce WARNING in __cfg80211_bss_update
2025/06/01 20:50 linux-next 3a83b350b5be 3d2f584d .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root WARNING in __cfg80211_bss_update
* Struck through repros no longer work on HEAD.