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WARNING in __ieee80211_beacon_get

Status: upstream: reported C repro on 2025/06/17 09:14
Bug presence: origin:lts-only
[Documentation on labels]
Reported-by: syzbot+feb2f6f6d7672169abb7@syzkaller.appspotmail.com
First crash: 261d, last: 6h04m
▶ ▼ Bug presence (2)
Date Name Commit Repro Result
2025/06/24 linux-6.6.y (ToT) 6282921b6825 C [report] WARNING in __ieee80211_beacon_get
2025/06/24 upstream (ToT) 78f4e737a53e C Didn't crash
▶ ▼ Similar bugs (7)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-4.19 WARNING in __ieee80211_beacon_get (3) -1 C 224 1094d 1600d 0/1 upstream: reported C repro on 2021/10/16 16:09
upstream WARNING in __ieee80211_beacon_get wireless -1 C done 143787 247d 1977d 29/29 fixed on 2025/08/06 17:37
linux-5.15 WARNING in __ieee80211_beacon_get origin:upstream -1 C 14799 2h38m 1092d 0/3 upstream: reported C repro on 2023/03/08 22:50
linux-4.19 WARNING in __ieee80211_beacon_get -1 2 1887d 1891d 0/1 auto-closed as invalid on 2021/05/02 15:33
linux-4.14 WARNING in __ieee80211_beacon_get -1 1 1959d 1959d 0/1 auto-closed as invalid on 2021/02/20 01:09
linux-6.1 WARNING in __ieee80211_beacon_get origin:upstream missing-backport -1 C inconclusive 14765 6h20m 1088d 0/3 upstream: reported C repro on 2023/03/13 04:41
linux-4.19 WARNING in __ieee80211_beacon_get (2) -1 4 1735d 1761d 0/1 auto-closed as invalid on 2021/10/02 04:19
▶ ▼ Fix bisection attempts (1)
Created Duration User Patch Repo Result
2025/09/10 10:35 2h15m fix candidate upstream OK (0) job log

Sample crash report:
------------[ cut here ]------------
WARNING: CPU: 0 PID: 5945 at net/mac80211/tx.c:5019 __ieee80211_beacon_update_cntdwn net/mac80211/tx.c:5019 [inline]
WARNING: CPU: 0 PID: 5945 at net/mac80211/tx.c:5019 __ieee80211_beacon_get+0x1233/0x1600 net/mac80211/tx.c:5430
Modules linked in:
CPU: 0 PID: 5945 Comm: syz-executor405 Not tainted 6.6.94-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
RIP: 0010:__ieee80211_beacon_update_cntdwn net/mac80211/tx.c:5019 [inline]
RIP: 0010:__ieee80211_beacon_get+0x1233/0x1600 net/mac80211/tx.c:5430
Code: 24 4c 89 e7 e8 3e b0 dd f7 45 31 f6 4c 8b bc 24 a0 00 00 00 e9 7a fe ff ff e8 59 27 9f f7 0f 0b e9 f6 f7 ff ff e8 4d 27 9f f7 <0f> 0b e9 48 fb ff ff e8 41 27 9f f7 48 c7 c7 60 2c 23 8e 4c 89 e6
RSP: 0018:ffffc90000007a18 EFLAGS: 00010246
RAX: ffffffff89e66e83 RBX: ffffffff89e65c86 RCX: ffff8880241f0000
RDX: 0000000000000100 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: ffff8880241f0000 R09: 0000000000000003
R10: 0000000000000007 R11: 0000000000000100 R12: ffff88806ec823c0
R13: dffffc0000000000 R14: ffff88806ec828b0 R15: ffff888020b12024
FS:  0000555575277380(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000020000002d000 CR3: 000000002da87000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 ieee80211_beacon_get_tim+0xb8/0x560 net/mac80211/tx.c:5557
 ieee80211_beacon_get include/net/mac80211.h:5438 [inline]
 mac80211_hwsim_beacon_tx+0x3c7/0x780 drivers/net/wireless/virtual/mac80211_hwsim.c:2260
 __iterate_interfaces+0x243/0x500 net/mac80211/util.c:766
 ieee80211_iterate_active_interfaces_atomic+0xdb/0x180 net/mac80211/util.c:802
 mac80211_hwsim_beacon+0xbb/0x1b0 drivers/net/wireless/virtual/mac80211_hwsim.c:2290
 __run_hrtimer kernel/time/hrtimer.c:1755 [inline]
 __hrtimer_run_queues+0x51e/0xc40 kernel/time/hrtimer.c:1819
 hrtimer_run_softirq+0x187/0x2b0 kernel/time/hrtimer.c:1836
 handle_softirqs+0x280/0x820 kernel/softirq.c:578
 __do_softirq kernel/softirq.c:612 [inline]
 invoke_softirq kernel/softirq.c:452 [inline]
 __irq_exit_rcu+0xc7/0x190 kernel/softirq.c:661
 irq_exit_rcu+0x9/0x20 kernel/softirq.c:673
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1088 [inline]
 sysvec_apic_timer_interrupt+0xa4/0xc0 arch/x86/kernel/apic/apic.c:1088
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:687
RIP: 0010:generic_exec_single+0x476/0x4f0 kernel/smp.c:418
Code: 75 11 e8 7d f6 0a 00 48 85 db 75 16 e8 73 f6 0a 00 eb 15 e8 6c f6 0a 00 e8 e7 97 eb 08 48 85 db 74 ea e8 5d f6 0a 00 fb 31 c0 <48> c7 44 24 20 0e 36 e0 45 4b c7 04 2c 00 00 00 00 66 43 c7 44 2c
RSP: 0018:ffffc90004b37980 EFLAGS: 00000246
RAX: 0000000000000000 RBX: 0000000000000200 RCX: ffff8880241f0000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc90004b37a58 R08: ffffffff8e49ab2f R09: 1ffffffff1c93565
R10: dffffc0000000000 R11: fffffbfff1c93566 R12: 1ffff92000966f34
R13: dffffc0000000000 R14: 0000000000000000 R15: 1ffff92000966f5d
 smp_call_function_single_async+0x75/0x100 kernel/smp.c:695
 rdmsr_safe_on_cpu+0x128/0x220 arch/x86/lib/msr-smp.c:181
 msr_read+0x151/0x250 arch/x86/kernel/msr.c:66
 vfs_read+0x27e/0x920 fs/read_write.c:468
 ksys_read+0x147/0x250 fs/read_write.c:613
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f61ed0b79e9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 01 1a 00 00 90 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 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffd83defc08 EFLAGS: 00000246 ORIG_RAX: 0000000000000000
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00007f61ed0b79e9
RDX: 0000000000018ff8 RSI: 0000200000019680 RDI: 0000000000000004
RBP: 0000000000000000 R08: 0072736d2f232f75 R09: 00007f61ed102202
R10: 000000000000000f R11: 0000000000000246 R12: 00007ffd83defc2c
R13: 00007ffd83defc60 R14: 00007ffd83defc40 R15: 000000000000001a
 </TASK>
----------------
Code disassembly (best guess):
   0:	75 11                	jne    0x13
   2:	e8 7d f6 0a 00       	call   0xaf684
   7:	48 85 db             	test   %rbx,%rbx
   a:	75 16                	jne    0x22
   c:	e8 73 f6 0a 00       	call   0xaf684
  11:	eb 15                	jmp    0x28
  13:	e8 6c f6 0a 00       	call   0xaf684
  18:	e8 e7 97 eb 08       	call   0x8eb9804
  1d:	48 85 db             	test   %rbx,%rbx
  20:	74 ea                	je     0xc
  22:	e8 5d f6 0a 00       	call   0xaf684
  27:	fb                   	sti
  28:	31 c0                	xor    %eax,%eax
* 2a:	48 c7 44 24 20 0e 36 	movq   $0x45e0360e,0x20(%rsp) <-- trapping instruction
  31:	e0 45
  33:	4b c7 04 2c 00 00 00 	movq   $0x0,(%r12,%r13,1)
  3a:	00
  3b:	66                   	data16
  3c:	43                   	rex.XB
  3d:	c7                   	.byte 0xc7
  3e:	44                   	rex.R
  3f:	2c                   	.byte 0x2c

Crashes (3018):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2025/06/26 04:56 linux-6.6.y 6282921b6825 26d77996 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in __ieee80211_beacon_get
2025/06/22 23:49 linux-6.6.y 6282921b6825 d6cdfb8a .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in __ieee80211_beacon_get
2026/03/05 04:48 linux-6.6.y 682d8e2f892b a9fe5c9e .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in __ieee80211_beacon_get
2026/03/03 08:36 linux-6.6.y 7a137e9bfa0e 28b83e23 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in __ieee80211_beacon_get
2026/03/01 11:01 linux-6.6.y 7a137e9bfa0e 43249bac .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in __ieee80211_beacon_get
2026/03/01 06:24 linux-6.6.y 7a137e9bfa0e 43249bac .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in __ieee80211_beacon_get
2026/03/01 04:43 linux-6.6.y 7a137e9bfa0e 43249bac .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in __ieee80211_beacon_get
2026/02/28 18:49 linux-6.6.y 7a137e9bfa0e 43249bac .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in __ieee80211_beacon_get
2026/02/28 14:22 linux-6.6.y 7a137e9bfa0e 43249bac .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in __ieee80211_beacon_get
2026/02/28 10:47 linux-6.6.y 7a137e9bfa0e 43249bac .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in __ieee80211_beacon_get
2026/02/28 01:53 linux-6.6.y 7a137e9bfa0e 2cf092b8 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in __ieee80211_beacon_get
2026/02/25 17:09 linux-6.6.y 7a137e9bfa0e 94a9671e .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in __ieee80211_beacon_get
2026/02/24 20:05 linux-6.6.y 7a137e9bfa0e 96b1aa46 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in __ieee80211_beacon_get
2026/02/24 17:43 linux-6.6.y 7a137e9bfa0e 96b1aa46 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in __ieee80211_beacon_get
2026/02/24 06:07 linux-6.6.y 7a137e9bfa0e 41d2fa6a .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in __ieee80211_beacon_get
2026/02/23 19:10 linux-6.6.y 7a137e9bfa0e 6beca497 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in __ieee80211_beacon_get
2026/02/22 07:48 linux-6.6.y 7a137e9bfa0e 6e7b5511 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in __ieee80211_beacon_get
2026/02/21 16:49 linux-6.6.y 7a137e9bfa0e 6e7b5511 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in __ieee80211_beacon_get
2026/02/21 10:56 linux-6.6.y 7a137e9bfa0e 6e7b5511 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in __ieee80211_beacon_get
2026/02/21 02:23 linux-6.6.y 7a137e9bfa0e 6e7b5511 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in __ieee80211_beacon_get
2026/02/20 15:36 linux-6.6.y 7a137e9bfa0e 17d780d6 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in __ieee80211_beacon_get
2026/02/20 03:18 linux-6.6.y 7a137e9bfa0e c8d8c52d .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in __ieee80211_beacon_get
2026/02/20 01:18 linux-6.6.y 7a137e9bfa0e c8d8c52d .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in __ieee80211_beacon_get
2026/02/19 23:56 linux-6.6.y 7a137e9bfa0e c8d8c52d .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in __ieee80211_beacon_get
2026/02/19 15:38 linux-6.6.y 56865d9b7074 746545b8 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in __ieee80211_beacon_get
2026/02/19 15:06 linux-6.6.y 56865d9b7074 746545b8 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in __ieee80211_beacon_get
2026/02/19 01:25 linux-6.6.y 56865d9b7074 77d4d919 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in __ieee80211_beacon_get
2026/02/19 01:12 linux-6.6.y 56865d9b7074 77d4d919 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in __ieee80211_beacon_get
2026/02/18 12:49 linux-6.6.y 56865d9b7074 39751c21 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in __ieee80211_beacon_get
2026/02/17 10:36 linux-6.6.y 56865d9b7074 e439b951 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in __ieee80211_beacon_get
2026/02/15 18:13 linux-6.6.y 1b4ef5214f17 1e62d198 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in __ieee80211_beacon_get
2026/02/15 12:53 linux-6.6.y 1b4ef5214f17 1e62d198 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in __ieee80211_beacon_get
2026/02/15 06:13 linux-6.6.y 1b4ef5214f17 1e62d198 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in __ieee80211_beacon_get
2026/02/14 20:20 linux-6.6.y 1b4ef5214f17 1e62d198 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in __ieee80211_beacon_get
2026/02/14 19:46 linux-6.6.y 1b4ef5214f17 1e62d198 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in __ieee80211_beacon_get
2026/02/14 18:32 linux-6.6.y 1b4ef5214f17 1e62d198 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in __ieee80211_beacon_get
2026/02/14 03:08 linux-6.6.y 1b4ef5214f17 1e62d198 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in __ieee80211_beacon_get
2026/02/14 02:45 linux-6.6.y 1b4ef5214f17 1e62d198 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in __ieee80211_beacon_get
2026/02/13 13:24 linux-6.6.y 1b4ef5214f17 6a673c50 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in __ieee80211_beacon_get
2026/02/11 06:52 linux-6.6.y c56aaf1a85ae 441e25b7 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in __ieee80211_beacon_get
2026/02/11 05:46 linux-6.6.y c56aaf1a85ae 441e25b7 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in __ieee80211_beacon_get
2026/02/10 20:18 linux-6.6.y c56aaf1a85ae 91d776d3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in __ieee80211_beacon_get
2026/02/10 20:12 linux-6.6.y c56aaf1a85ae 91d776d3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in __ieee80211_beacon_get
2026/02/10 15:48 linux-6.6.y c56aaf1a85ae 91d776d3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in __ieee80211_beacon_get
2026/02/10 09:17 linux-6.6.y c56aaf1a85ae 4ab09a02 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in __ieee80211_beacon_get
2026/02/10 07:22 linux-6.6.y c56aaf1a85ae 4ab09a02 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in __ieee80211_beacon_get
2026/02/09 22:17 linux-6.6.y c56aaf1a85ae df949cd9 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in __ieee80211_beacon_get
2026/02/09 16:58 linux-6.6.y c56aaf1a85ae df949cd9 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in __ieee80211_beacon_get
2026/02/09 15:19 linux-6.6.y c56aaf1a85ae df949cd9 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in __ieee80211_beacon_get
2025/06/17 09:14 linux-6.6.y c2603c511feb cfebc887 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in __ieee80211_beacon_get
* Struck through repros no longer work on HEAD.