syzbot


WARNING in __mod_timer

Status: fixed on 2024/04/29 07:11
Reported-by: syzbot+12d910b559660fec2af0@syzkaller.appspotmail.com
Fix commit: a44770fed865 bpf, sockmap: Prevent lock inversion deadlock in map delete elem
First crash: 110d, last: 110d
Fix bisection: fixed by (bisect log) :
commit a44770fed86515eedb5a7c00b787f847ebb134a5
Author: Jakub Sitnicki <jakub@cloudflare.com>
Date: Tue Apr 2 10:46:21 2024 +0000

  bpf, sockmap: Prevent lock inversion deadlock in map delete elem

  
Bug presence (1)
Date Name Commit Repro Result
2024/04/27 upstream (ToT) 5eb4573ea63d C Didn't crash
Similar bugs (2)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream WARNING in __mod_timer keyrings lsm 2 472d 506d 22/27 fixed on 2023/06/08 14:41
upstream WARNING in __mod_timer (2) usb 2 96d 98d 0/27 upstream: reported on 2024/04/10 19:08

Sample crash report:
------------[ cut here ]------------
raw_local_irq_restore() called with IRQs enabled
WARNING: CPU: 0 PID: 15 at kernel/locking/irqflag-debug.c:10 warn_bogus_irq_restore+0x1d/0x20 kernel/locking/irqflag-debug.c:10
Modules linked in:

CPU: 0 PID: 15 Comm: ksoftirqd/0 Not tainted 6.1.83-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024
RIP: 0010:warn_bogus_irq_restore+0x1d/0x20 kernel/locking/irqflag-debug.c:10
Code: 24 48 c7 c7 80 bb ea 8a e8 6c f5 fd ff 80 3d af 86 d5 03 00 74 01 c3 c6 05 a5 86 d5 03 01 48 c7 c7 e0 e5 eb 8a e8 23 94 c8 f6 <0f> 0b c3 41 56 53 48 83 ec 10 65 48 8b 04 25 28 00 00 00 48 89 44
RSP: 0018:ffffc900001475f8 EFLAGS: 00010246

RAX: 9946aff1f597ec00 RBX: 1ffff92000028ec4 RCX: ffff88813feabb80
RDX: 0000000080000102 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc90000147690 R08: ffffffff81527eae R09: ffffed1017304f1c
R10: 0000000000000000 R11: dffffc0000000001 R12: dffffc0000000000
R13: 1ffff92000028ec0 R14: ffffc90000147620 R15: 0000000000000046
FS:  0000000000000000(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fb398666110 CR3: 000000002245c000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:151 [inline]
 _raw_spin_unlock_irqrestore+0x118/0x130 kernel/locking/spinlock.c:194
 __mod_timer+0x956/0xee0 kernel/time/timer.c:1118
 queue_delayed_work_on+0x156/0x250 kernel/workqueue.c:1704
 queue_delayed_work include/linux/workqueue.h:527 [inline]
 srcu_funnel_gp_start kernel/rcu/srcutree.c:951 [inline]
 srcu_gp_start_if_needed+0xce5/0x1080 kernel/rcu/srcutree.c:1151
 rcu_do_batch kernel/rcu/tree.c:2296 [inline]
 rcu_core+0xad4/0x17e0 kernel/rcu/tree.c:2556
 __do_softirq+0x2e9/0xa4c kernel/softirq.c:571
 run_ksoftirqd+0xc1/0x120 kernel/softirq.c:934
 smpboot_thread_fn+0x52c/0xa30 kernel/smpboot.c:164
 kthread+0x28d/0x320 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:307
 </TASK>

Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2024/03/29 08:08 linux-6.1.y e5cd595e23c1 c52bcb23 .config console log report syz C [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-perf WARNING in __mod_timer
* Struck through repros no longer work on HEAD.