syzbot


WARNING in posixtimer_send_sigqueue (2)

Status: fixed on 2025/05/06 15:33
Subsystems: kernel
[Documentation on labels]
Reported-by: syzbot+3c2e3cc60665d71de2f7@syzkaller.appspotmail.com
Fix commit: 8c4840277b6d signal/posixtimers: Handle ignore/blocked sequences correctly
First crash: 153d, last: 104d
Cause bisection: introduced by (bisect log) :
commit df7a996b4dab03c889fa86d849447b716f07b069
Author: Thomas Gleixner <tglx@linutronix.de>
Date: Tue Nov 5 08:14:54 2024 +0000

  signal: Queue ignored posixtimers on ignore list

Crash: WARNING in posixtimer_send_sigqueue (log)
Repro: syz .config
  
Discussions (2)
Title Replies (including bot) Last reply
[PATCH] signal/posixtimers: Handle ignore/blocked sequences correctly 8 (8) 2025/01/15 17:19
[syzbot] [kernel?] WARNING in posixtimer_send_sigqueue (2) 0 (1) 2024/12/17 17:14
Similar bugs (1)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream WARNING in posixtimer_send_sigqueue kernel C error 196 153d 185d 28/28 fixed on 2024/12/16 09:50

Sample crash report:
------------[ cut here ]------------
WARNING: CPU: 1 PID: 5933 at kernel/signal.c:2050 posixtimer_send_sigqueue+0xba8/0x1020 kernel/signal.c:2050
Modules linked in:
CPU: 1 UID: 0 PID: 5933 Comm: syz-executor261 Not tainted 6.13.0-rc3-syzkaller #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
RIP: 0010:posixtimer_send_sigqueue+0xba8/0x1020 kernel/signal.c:2050
Code: ff ff 4c 89 e7 e8 98 ff 9d 00 e9 7e f8 ff ff 41 bf 02 00 00 00 e9 87 f8 ff ff 48 89 54 24 10 48 89 44 24 08 e8 59 51 3b 00 90 <0f> 0b 90 48 8d 7b 10 48 8b 44 24 08 48 b9 00 00 00 00 00 fc ff df
RSP: 0018:ffffc900006b0d50 EFLAGS: 00010046
RAX: 0000000080010003 RBX: ffff888031d62000 RCX: 1ffff110063ac403
RDX: ffff888022920000 RSI: ffffffff815ec2e7 RDI: 0000000000000001
RBP: ffff888029fb2440 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000003 R12: ffff888031d620a4
R13: 1ffff920000d61af R14: ffff888031d620d8 R15: ffff888031d620c0
FS:  00007fb777ee36c0(0000) GS:ffff88806a700000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020040fe0 CR3: 0000000023c34000 CR4: 0000000000352ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 posix_timer_fn+0x31/0x60 kernel/time/posix-timers.c:323
 __run_hrtimer kernel/time/hrtimer.c:1739 [inline]
 __hrtimer_run_queues+0x20a/0xae0 kernel/time/hrtimer.c:1803
 hrtimer_interrupt+0x392/0x8e0 kernel/time/hrtimer.c:1865
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1038 [inline]
 __sysvec_apic_timer_interrupt+0x10f/0x400 arch/x86/kernel/apic/apic.c:1055
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1049 [inline]
 sysvec_apic_timer_interrupt+0x9f/0xc0 arch/x86/kernel/apic/apic.c:1049
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:152 [inline]
RIP: 0010:_raw_spin_unlock_irqrestore+0x31/0x80 kernel/locking/spinlock.c:194
Code: f5 53 48 8b 74 24 10 48 89 fb 48 83 c7 18 e8 86 04 4b f6 48 89 df e8 ce 83 4b f6 f7 c5 00 02 00 00 75 23 9c 58 f6 c4 02 75 37 <bf> 01 00 00 00 e8 c5 68 3c f6 65 8b 05 96 23 d8 74 85 c0 74 16 5b
RSP: 0018:ffffc900028f7d58 EFLAGS: 00000246
RAX: 0000000000000002 RBX: ffff888031d62030 RCX: 1ffffffff20bdd41
RDX: 0000000000000000 RSI: ffffffff8b6cd840 RDI: ffffffff8bd1e7e0
RBP: 0000000000000293 R08: 0000000000000001 R09: 0000000000000001
R10: ffffffff905f2c57 R11: 0000000000000002 R12: ffffc900028f7e50
R13: 0000000000000000 R14: 1ffff9200051efb1 R15: dffffc0000000000
 spin_unlock_irqrestore include/linux/spinlock.h:406 [inline]
 unlock_timer kernel/time/posix-timers.c:128 [inline]
 do_timer_settime+0x315/0x400 kernel/time/posix-timers.c:908
 __do_sys_timer_settime kernel/time/posix-timers.c:928 [inline]
 __se_sys_timer_settime kernel/time/posix-timers.c:914 [inline]
 __x64_sys_timer_settime+0x26a/0x2c0 kernel/time/posix-timers.c:914
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fb777f283a9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 51 18 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 b0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fb777ee3228 EFLAGS: 00000246 ORIG_RAX: 00000000000000df
RAX: ffffffffffffffda RBX: 000000000000001e RCX: 00007fb777f283a9
RDX: 0000000020040fe0 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007fb777fb2308 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fb777fb2300
R13: 00007fb777fb230c R14: 00007fffae0f2ba0 R15: 00007fffae0f2c88
 </TASK>
----------------
Code disassembly (best guess):
   0:	f5                   	cmc
   1:	53                   	push   %rbx
   2:	48 8b 74 24 10       	mov    0x10(%rsp),%rsi
   7:	48 89 fb             	mov    %rdi,%rbx
   a:	48 83 c7 18          	add    $0x18,%rdi
   e:	e8 86 04 4b f6       	call   0xf64b0499
  13:	48 89 df             	mov    %rbx,%rdi
  16:	e8 ce 83 4b f6       	call   0xf64b83e9
  1b:	f7 c5 00 02 00 00    	test   $0x200,%ebp
  21:	75 23                	jne    0x46
  23:	9c                   	pushf
  24:	58                   	pop    %rax
  25:	f6 c4 02             	test   $0x2,%ah
  28:	75 37                	jne    0x61
* 2a:	bf 01 00 00 00       	mov    $0x1,%edi <-- trapping instruction
  2f:	e8 c5 68 3c f6       	call   0xf63c68f9
  34:	65 8b 05 96 23 d8 74 	mov    %gs:0x74d82396(%rip),%eax        # 0x74d823d1
  3b:	85 c0                	test   %eax,%eax
  3d:	74 16                	je     0x55
  3f:	5b                   	pop    %rbx

Crashes (557):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2024/12/16 20:21 upstream 78d4f34e2115 eec85da6 .config console log report syz / log C [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream WARNING in posixtimer_send_sigqueue
2024/12/16 12:14 upstream dccbe2047a5b 7cbfbb3a .config console log report syz / log [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce WARNING in posixtimer_send_sigqueue
2024/12/16 11:31 upstream dccbe2047a5b 7cbfbb3a .config console log report syz / log [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce WARNING in posixtimer_send_sigqueue
2024/12/16 15:14 upstream 78d4f34e2115 eec85da6 .config console log report syz / log [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream WARNING in posixtimer_send_sigqueue
2025/01/19 15:53 upstream fda5e3f28400 f2cb035c .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root WARNING in posixtimer_send_sigqueue
2025/01/19 14:35 upstream fda5e3f28400 f2cb035c .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce WARNING in posixtimer_send_sigqueue
2025/01/19 04:55 upstream fda5e3f28400 f2cb035c .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-badwrites-root WARNING in posixtimer_send_sigqueue
2025/01/19 02:03 upstream fda5e3f28400 f2cb035c .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root WARNING in posixtimer_send_sigqueue
2025/01/18 23:44 upstream 595523945be0 f2cb035c .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root WARNING in posixtimer_send_sigqueue
2025/01/18 19:17 upstream 595523945be0 f2cb035c .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root WARNING in posixtimer_send_sigqueue
2025/01/18 14:24 upstream 595523945be0 f2cb035c .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root WARNING in posixtimer_send_sigqueue
2025/01/18 10:44 upstream 595523945be0 f2cb035c .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce WARNING in posixtimer_send_sigqueue
2025/01/17 22:34 upstream 9bffa1ad25b8 953d1c45 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root WARNING in posixtimer_send_sigqueue
2025/01/17 18:45 upstream 9bffa1ad25b8 953d1c45 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce WARNING in posixtimer_send_sigqueue
2025/01/17 05:17 upstream ce69b4019001 f9e07a6e .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root WARNING in posixtimer_send_sigqueue
2025/01/16 02:24 upstream 619f0b6fad52 968edaf4 .config console log report info [disk image] [vmlinux] [kernel image] ci-qemu-gce-upstream-auto WARNING in posixtimer_send_sigqueue
2025/01/15 19:55 upstream 619f0b6fad52 7315a7cf .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce WARNING in posixtimer_send_sigqueue
2025/01/15 09:02 upstream c3812b15000c 7315a7cf .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce WARNING in posixtimer_send_sigqueue
2025/01/15 07:20 upstream c3812b15000c 7315a7cf .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root WARNING in posixtimer_send_sigqueue
2025/01/15 05:06 upstream c3812b15000c 7315a7cf .config console log report info [disk image] [vmlinux] [kernel image] ci-qemu-gce-upstream-auto WARNING in posixtimer_send_sigqueue
2025/01/14 09:25 upstream c45323b7560e b1f1cd88 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce WARNING in posixtimer_send_sigqueue
2025/01/13 16:25 upstream 5bc55a333a2f 6dbc6a9b .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce WARNING in posixtimer_send_sigqueue
2025/01/13 04:32 upstream be548645527a 6dbc6a9b .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce WARNING in posixtimer_send_sigqueue
2025/01/19 16:54 upstream fda5e3f28400 f2cb035c .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-386 WARNING in posixtimer_send_sigqueue
2025/01/14 01:58 upstream c45323b7560e b1f1cd88 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-386 WARNING in posixtimer_send_sigqueue
2025/01/13 18:33 upstream 5bc55a333a2f 6dbc6a9b .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-386 WARNING in posixtimer_send_sigqueue
2025/01/19 13:24 upstream fda5e3f28400 f2cb035c .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream WARNING in posixtimer_send_sigqueue
2025/01/19 09:43 upstream fda5e3f28400 f2cb035c .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root WARNING in posixtimer_send_sigqueue
2025/01/19 05:57 upstream fda5e3f28400 f2cb035c .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream WARNING in posixtimer_send_sigqueue
2025/01/18 17:43 upstream 595523945be0 f2cb035c .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream WARNING in posixtimer_send_sigqueue
2025/01/18 08:04 upstream ad26fc09dabf f2cb035c .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream WARNING in posixtimer_send_sigqueue
2025/01/17 21:17 upstream 9bffa1ad25b8 bb91bdd4 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root WARNING in posixtimer_send_sigqueue
2025/01/17 17:04 upstream 9bffa1ad25b8 bb91bdd4 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root WARNING in posixtimer_send_sigqueue
2025/01/17 11:36 upstream 9bffa1ad25b8 bb91bdd4 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream WARNING in posixtimer_send_sigqueue
2025/01/16 23:41 upstream ce69b4019001 f9e07a6e .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream WARNING in posixtimer_send_sigqueue
2025/01/16 20:51 upstream ce69b4019001 f9e07a6e .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream WARNING in posixtimer_send_sigqueue
2025/01/16 16:19 upstream 619f0b6fad52 f9e07a6e .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream WARNING in posixtimer_send_sigqueue
2025/01/16 14:14 upstream 619f0b6fad52 f9e07a6e .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream WARNING in posixtimer_send_sigqueue
2025/01/16 12:19 upstream 619f0b6fad52 968edaf4 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root WARNING in posixtimer_send_sigqueue
2025/01/16 08:18 upstream 619f0b6fad52 968edaf4 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream WARNING in posixtimer_send_sigqueue
2025/01/16 04:14 upstream 619f0b6fad52 968edaf4 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root WARNING in posixtimer_send_sigqueue
2025/01/14 23:27 upstream c3812b15000c 7315a7cf .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream WARNING in posixtimer_send_sigqueue
2025/01/14 13:29 upstream c45323b7560e 0dce2409 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream WARNING in posixtimer_send_sigqueue
2025/01/14 11:16 upstream c45323b7560e 0dce2409 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream WARNING in posixtimer_send_sigqueue
2025/01/14 03:14 upstream c45323b7560e b1f1cd88 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root WARNING in posixtimer_send_sigqueue
2025/01/13 23:23 upstream c45323b7560e b1f1cd88 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream WARNING in posixtimer_send_sigqueue
2025/01/13 04:17 upstream be548645527a 6dbc6a9b .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root WARNING in posixtimer_send_sigqueue
2025/01/16 10:22 upstream 619f0b6fad52 968edaf4 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu2-arm64-mte WARNING in posixtimer_send_sigqueue
2025/01/08 10:41 upstream 09a0fa92e5b4 f3558dbf .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 WARNING in posixtimer_send_sigqueue
2024/12/21 17:58 upstream 499551201b5f d7f584ee .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu2-arm64 WARNING in posixtimer_send_sigqueue
2025/01/12 05:44 linux-next 7b4b9bf203da 6dbc6a9b .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root WARNING in posixtimer_send_sigqueue
2025/02/03 07:16 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 1950a0af2d55 568559e4 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 WARNING in posixtimer_send_sigqueue
2025/02/03 05:42 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 1950a0af2d55 568559e4 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 WARNING in posixtimer_send_sigqueue
2025/02/02 03:48 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 1950a0af2d55 0dff8567 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 WARNING in posixtimer_send_sigqueue
2025/02/01 16:13 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 1950a0af2d55 0dff8567 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 WARNING in posixtimer_send_sigqueue
2025/01/30 19:48 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 1950a0af2d55 9c8ab845 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 WARNING in posixtimer_send_sigqueue
2025/01/27 06:40 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 1950a0af2d55 9fbd772e .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 WARNING in posixtimer_send_sigqueue
2025/01/25 09:46 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 1950a0af2d55 9fbd772e .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 WARNING in posixtimer_send_sigqueue
2025/01/23 14:29 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 1950a0af2d55 9d4f14f8 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 WARNING in posixtimer_send_sigqueue
2025/01/23 12:29 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 1950a0af2d55 9d4f14f8 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 WARNING in posixtimer_send_sigqueue
2025/01/19 21:58 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 1950a0af2d55 f2cb035c .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 WARNING in posixtimer_send_sigqueue
2025/01/18 12:42 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 1950a0af2d55 f2cb035c .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 WARNING in posixtimer_send_sigqueue
2025/01/14 08:02 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 6251d1776bc5 b1f1cd88 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 WARNING in posixtimer_send_sigqueue
* Struck through repros no longer work on HEAD.