syzbot


WARNING in dev_watchdog

Status: upstream: reported C repro on 2023/03/10 20:16
Bug presence: origin:lts-only
Labels: missing-backport
[Documentation on labels]
Reported-by: syzbot+2c8f0024310bcf69a3af@syzkaller.appspotmail.com
First crash: 638d, last: 33d
Bug presence (2)
Date Name Commit Repro Result
2024/01/25 linux-5.15.y (ToT) ddcaf4999061 C [report] WARNING in dev_watchdog
2024/01/25 upstream (ToT) 6098d87eaf31 C Didn't crash
Similar bugs (4)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream WARNING in dev_watchdog (3) net 1 127d 127d 0/28 closed as invalid on 2024/09/04 18:18
upstream WARNING in dev_watchdog (2) net C inconclusive 6791 315d 1714d 25/28 fixed on 2024/01/30 15:47
linux-6.1 WARNING in dev_watchdog origin:upstream missing-backport C inconclusive 149 101d 637d 0/3 upstream: reported C repro on 2023/03/11 19:14
upstream WARNING in dev_watchdog 25 2639d 2664d 0/28 closed as invalid on 2017/10/22 12:45
Last patch testing requests (8)
Created Duration User Patch Repo Result
2024/11/04 20:30 11m retest repro linux-5.15.y report log
2024/11/04 20:30 11m retest repro linux-5.15.y report log
2024/11/04 20:30 9m retest repro linux-5.15.y report log
2024/10/20 15:50 16m retest repro linux-5.15.y report log
2024/10/20 15:50 17m retest repro linux-5.15.y report log
2024/10/20 15:50 15m retest repro linux-5.15.y report log
2024/10/20 15:50 18m retest repro linux-5.15.y report log
2024/10/20 15:50 12m retest repro linux-5.15.y report log
Fix bisection attempts (2)
Created Duration User Patch Repo Result
2024/03/22 16:56 2h47m fix candidate upstream OK (0) job log
2024/01/23 20:36 0m fix candidate upstream error job log

Sample crash report:
------------[ cut here ]------------
NETDEV WATCHDOG: sl0 (): transmit queue 0 timed out
WARNING: CPU: 1 PID: 0 at net/sched/sch_generic.c:478 dev_watchdog+0x93c/0xb10 net/sched/sch_generic.c:477
Modules linked in:
CPU: 1 PID: 0 Comm: swapper/1 Not tainted 5.15.147-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/17/2023
RIP: 0010:dev_watchdog+0x93c/0xb10 net/sched/sch_generic.c:477
Code: 05 a8 19 7d 05 01 48 8b 5c 24 28 48 89 df e8 8b cc e2 ff 48 c7 c7 40 0f 7c 8b 48 89 de 48 89 c2 48 8b 4c 24 10 e8 d4 a6 f8 f8 <0f> 0b e9 fe fc ff ff e8 58 f4 2c f9 0f 0b e9 83 fc ff ff 44 89 e1
RSP: 0018:ffffc90000dd0b10 EFLAGS: 00010246
RAX: c81e7bda9ea2ed00 RBX: ffff8880796b8000 RCX: ffff888012968000
RDX: 0000000000000102 RSI: 0000000000000102 RDI: 0000000000000000
RBP: 00000000ffffb301 R08: ffffffff81665dbc R09: fffff520001ba0a5
R10: 0000000000000000 R11: dffffc0000000001 R12: ffff8880796b8448
R13: ffff8880796b8440 R14: ffff8880796b8540 R15: ffff8880796b8460
FS:  0000000000000000(0000) GS:ffff8880b9b00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fff5a384118 CR3: 000000000c68e000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 call_timer_fn+0x16d/0x560 kernel/time/timer.c:1421
 expire_timers kernel/time/timer.c:1466 [inline]
 __run_timers+0x67c/0x890 kernel/time/timer.c:1737
 run_timer_softirq+0x63/0xf0 kernel/time/timer.c:1750
 __do_softirq+0x3b3/0x93a kernel/softirq.c:558
 invoke_softirq kernel/softirq.c:432 [inline]
 __irq_exit_rcu+0x155/0x240 kernel/softirq.c:637
 irq_exit_rcu+0x5/0x20 kernel/softirq.c:649
 sysvec_apic_timer_interrupt+0x91/0xb0 arch/x86/kernel/apic/apic.c:1096
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:638
RIP: 0010:native_save_fl arch/x86/include/asm/irqflags.h:22 [inline]
RIP: 0010:arch_local_save_flags arch/x86/include/asm/irqflags.h:70 [inline]
RIP: 0010:arch_irqs_disabled arch/x86/include/asm/irqflags.h:132 [inline]
RIP: 0010:acpi_safe_halt drivers/acpi/processor_idle.c:110 [inline]
RIP: 0010:acpi_idle_do_entry+0x10f/0x340 drivers/acpi/processor_idle.c:570
Code: 41 5a f7 48 83 e3 08 0f 85 0a 01 00 00 4c 8d 74 24 20 e8 44 b8 60 f7 0f 1f 44 00 00 e8 2a 3d 5a f7 0f 00 2d a3 95 bc 00 fb f4 <4c> 89 f3 48 c1 eb 03 42 80 3c 3b 00 74 08 4c 89 f7 e8 3b f0 a3 f7
RSP: 0018:ffffc90000d67b00 EFLAGS: 000002d3
RAX: ffffffff8a25f016 RBX: 0000000000000000 RCX: ffff888012968000
RDX: 0000000000000000 RSI: ffffffff8a8b0f80 RDI: ffffffff8ad87e00
RBP: ffffc90000d67b90 R08: ffffffff8186a880 R09: ffffed100252d001
R10: 0000000000000000 R11: dffffc0000000001 R12: 1ffff920001acf60
R13: ffff8881413a6004 R14: ffffc90000d67b20 R15: dffffc0000000000
 acpi_idle_enter+0x352/0x4f0 drivers/acpi/processor_idle.c:705
 cpuidle_enter_state+0x521/0xef0 drivers/cpuidle/cpuidle.c:237
 cpuidle_enter+0x59/0x90 drivers/cpuidle/cpuidle.c:351
 call_cpuidle kernel/sched/idle.c:158 [inline]
 cpuidle_idle_call kernel/sched/idle.c:239 [inline]
 do_idle+0x3e4/0x670 kernel/sched/idle.c:306
 cpu_startup_entry+0x14/0x20 kernel/sched/idle.c:403
 start_secondary+0x371/0x500 arch/x86/kernel/smpboot.c:281
 secondary_startup_64_no_verify+0xb1/0xbb
 </TASK>
----------------
Code disassembly (best guess):
   0:	41 5a                	pop    %r10
   2:	f7 48 83 e3 08 0f 85 	testl  $0x850f08e3,-0x7d(%rax)
   9:	0a 01                	or     (%rcx),%al
   b:	00 00                	add    %al,(%rax)
   d:	4c 8d 74 24 20       	lea    0x20(%rsp),%r14
  12:	e8 44 b8 60 f7       	call   0xf760b85b
  17:	0f 1f 44 00 00       	nopl   0x0(%rax,%rax,1)
  1c:	e8 2a 3d 5a f7       	call   0xf75a3d4b
  21:	0f 00 2d a3 95 bc 00 	verw   0xbc95a3(%rip)        # 0xbc95cb
  28:	fb                   	sti
  29:	f4                   	hlt
* 2a:	4c 89 f3             	mov    %r14,%rbx <-- trapping instruction
  2d:	48 c1 eb 03          	shr    $0x3,%rbx
  31:	42 80 3c 3b 00       	cmpb   $0x0,(%rbx,%r15,1)
  36:	74 08                	je     0x40
  38:	4c 89 f7             	mov    %r14,%rdi
  3b:	e8 3b f0 a3 f7       	call   0xf7a3f07b

Crashes (221):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2024/01/25 08:15 linux-5.15.y ddcaf4999061 1e153dc8 .config console log report syz C [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in dev_watchdog
2023/06/23 04:59 linux-5.15.y f67653019430 79782afc .config console log report syz C [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in dev_watchdog
2024/09/22 00:19 linux-5.15.y 3a5928702e71 6f888b75 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 WARNING in dev_watchdog
2024/09/18 14:55 linux-5.15.y 3a5928702e71 c673ca06 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 WARNING in dev_watchdog
2024/05/19 14:26 linux-5.15.y 83655231580b c0f1611a .config console log report syz C [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 WARNING in dev_watchdog
2024/04/22 17:22 linux-5.15.y c52b9710c83d 36c961ad .config console log report syz C [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 WARNING in dev_watchdog
2023/10/13 12:17 linux-5.15.y 02e21884dcf2 6388bc36 .config console log report syz C [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 WARNING in dev_watchdog
2023/05/28 20:55 linux-5.15.y 1fe619a7d252 cf184559 .config console log report syz C [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 WARNING in dev_watchdog
2024/10/06 04:13 linux-5.15.y 3a5928702e71 d7906eff .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in dev_watchdog
2024/10/04 10:14 linux-5.15.y 3a5928702e71 d7906eff .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in dev_watchdog
2024/08/06 00:59 linux-5.15.y 7e89efd3ae1c e35c337f .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in dev_watchdog
2024/06/11 18:16 linux-5.15.y c61bd26ae81a 4d75f4f7 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in dev_watchdog
2024/06/10 17:16 linux-5.15.y c61bd26ae81a 048c640a .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in dev_watchdog
2024/06/04 15:05 linux-5.15.y c61bd26ae81a 11f2afa5 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in dev_watchdog
2024/06/04 00:16 linux-5.15.y c61bd26ae81a a1feae05 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in dev_watchdog
2024/06/03 08:54 linux-5.15.y c61bd26ae81a 0aba2352 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in dev_watchdog
2024/06/01 03:08 linux-5.15.y c61bd26ae81a 3113787f .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in dev_watchdog
2024/05/31 10:41 linux-5.15.y c61bd26ae81a 0c378259 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in dev_watchdog
2024/05/28 00:58 linux-5.15.y c61bd26ae81a f550015e .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in dev_watchdog
2024/05/25 20:10 linux-5.15.y c61bd26ae81a a10a183e .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in dev_watchdog
2024/05/25 00:46 linux-5.15.y 83655231580b a10a183e .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in dev_watchdog
2024/05/24 17:48 linux-5.15.y 83655231580b a10a183e .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in dev_watchdog
2024/05/24 02:41 linux-5.15.y 83655231580b 8f98448e .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in dev_watchdog
2024/05/21 23:57 linux-5.15.y 83655231580b 1014eca7 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in dev_watchdog
2024/05/21 23:57 linux-5.15.y 83655231580b 1014eca7 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in dev_watchdog
2024/05/21 08:44 linux-5.15.y 83655231580b 4c0d3ee3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in dev_watchdog
2024/05/18 03:36 linux-5.15.y 83655231580b c0f1611a .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in dev_watchdog
2024/05/16 01:47 linux-5.15.y 284087d4f7d5 ef5d53ed .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in dev_watchdog
2024/05/13 22:50 linux-5.15.y 284087d4f7d5 9026e142 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in dev_watchdog
2024/05/13 13:08 linux-5.15.y 284087d4f7d5 9026e142 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in dev_watchdog
2024/05/11 10:26 linux-5.15.y 284087d4f7d5 9026e142 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in dev_watchdog
2024/05/10 04:10 linux-5.15.y 284087d4f7d5 de979bc2 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in dev_watchdog
2024/05/09 08:43 linux-5.15.y 284087d4f7d5 05079661 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in dev_watchdog
2024/05/08 19:39 linux-5.15.y 284087d4f7d5 20bf80e1 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in dev_watchdog
2024/05/08 17:27 linux-5.15.y 284087d4f7d5 20bf80e1 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in dev_watchdog
2024/05/08 03:48 linux-5.15.y 284087d4f7d5 4cf3f9b3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in dev_watchdog
2024/05/08 02:59 linux-5.15.y 284087d4f7d5 4cf3f9b3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in dev_watchdog
2024/05/06 20:55 linux-5.15.y 284087d4f7d5 d884b519 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in dev_watchdog
2024/05/06 13:30 linux-5.15.y 284087d4f7d5 d884b519 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in dev_watchdog
2024/05/06 09:45 linux-5.15.y 284087d4f7d5 d884b519 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in dev_watchdog
2024/05/05 01:13 linux-5.15.y 284087d4f7d5 610f2a54 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in dev_watchdog
2024/05/03 10:34 linux-5.15.y 284087d4f7d5 dd26401e .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in dev_watchdog
2024/05/02 23:33 linux-5.15.y 284087d4f7d5 ddfc15a1 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in dev_watchdog
2024/05/01 18:13 linux-5.15.y b925f60c6ee7 3ba885bc .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in dev_watchdog
2024/05/01 03:25 linux-5.15.y b925f60c6ee7 3ba885bc .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in dev_watchdog
2024/04/30 12:43 linux-5.15.y b925f60c6ee7 3ce4924c .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in dev_watchdog
2024/04/29 23:58 linux-5.15.y b925f60c6ee7 f10afd69 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in dev_watchdog
2024/10/04 23:00 linux-5.15.y 3a5928702e71 d7906eff .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 WARNING in dev_watchdog
2024/09/14 17:12 linux-5.15.y 3a5928702e71 c7e35043 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 WARNING in dev_watchdog
2024/08/27 11:29 linux-5.15.y fa93fa65db6e 9aee4e0b .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 WARNING in dev_watchdog
2024/05/13 05:48 linux-5.15.y 284087d4f7d5 9026e142 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 WARNING in dev_watchdog
2023/03/10 20:16 linux-5.15.y abddfcf701a5 5205ef30 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in dev_watchdog
* Struck through repros no longer work on HEAD.