syzbot


BUG: soft lockup in sys_syslog

Status: upstream: reported C repro on 2024/04/07 08:50
Bug presence: origin:lts
[Documentation on labels]
Reported-by: syzbot+5d20ba9387ac19a00546@syzkaller.appspotmail.com
First crash: 107d, last: 5d00h
Bug presence (2)
Date Name Commit Repro Result
2024/04/07 lts (merge base) 6139f2a02fe0 C [report] BUG: soft lockup in kauditd_thread
2024/04/07 upstream (ToT) f2f80ac80987 C Didn't crash
Similar bugs (4)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream INFO: rcu detected stall in sys_syslog kernel 1 315d 315d 0/27 auto-obsoleted due to no activity on 2023/12/11 00:13
upstream INFO: rcu detected stall in sys_syslog (2) input usb syz 8 27d 153d 0/27 upstream: reported syz repro on 2024/02/20 16:45
linux-5.15 INFO: rcu detected stall in sys_syslog 2 56d 58d 0/3 upstream: reported on 2024/05/26 09:39
linux-6.1 INFO: rcu detected stall in sys_syslog 1 47d 47d 0/3 upstream: reported on 2024/06/06 06:03
Last patch testing requests (8)
Created Duration User Patch Repo Result
2024/06/09 11:16 10m retest repro android13-5.15-lts report log
2024/06/09 09:53 15m retest repro android13-5.15-lts report log
2024/06/09 09:53 16m retest repro android13-5.15-lts report log
2024/06/09 09:53 40m retest repro android13-5.15-lts report log
2024/05/16 06:55 14m retest repro android13-5.15-lts report log
2024/05/16 06:55 10m retest repro android13-5.15-lts report log
2024/05/16 06:55 9m retest repro android13-5.15-lts report log
2024/05/16 05:42 12m retest repro android13-5.15-lts report log

Sample crash report:
watchdog: BUG: soft lockup - CPU#1 stuck for 245s! [klogd:89]
Modules linked in:
CPU: 1 PID: 89 Comm: klogd Not tainted 5.15.151-syzkaller-00415-gdb06c48ab67e #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/07/2024
RIP: 0010:native_safe_halt arch/x86/include/asm/irqflags.h:51 [inline]
RIP: 0010:arch_safe_halt arch/x86/include/asm/irqflags.h:89 [inline]
RIP: 0010:kvm_wait+0x147/0x180 arch/x86/kernel/kvm.c:918
Code: 4c 89 e8 48 c1 e8 03 42 0f b6 04 20 84 c0 44 8b 74 24 1c 75 34 41 0f b6 45 00 44 38 f0 75 10 66 90 0f 00 2d 2b 02 f3 03 fb f4 <e9> 24 ff ff ff fb e9 1e ff ff ff 44 89 e9 80 e1 07 38 c1 7c a3 4c
RSP: 0018:ffffc90000a076c0 EFLAGS: 00000246

RAX: 0000000000000001 RBX: 1ffff92000140edc RCX: 1ffffffff0d1aa9c
RDX: 0000000000000001 RSI: 0000000000000001 RDI: ffff8881f7138ad4
RBP: ffffc90000a07770 R08: dffffc0000000000 R09: ffffed103ee2715b
R10: 0000000000000000 R11: dffffc0000000001 R12: dffffc0000000000
R13: ffff8881f7138ad4 R14: 0000000000000001 R15: 1ffff92000140ee0
FS:  00007f6579826380(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000056124cae3a68 CR3: 000000010c3ca000 CR4: 00000000003506a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 </IRQ>
 <TASK>
 pv_wait arch/x86/include/asm/paravirt.h:597 [inline]
 pv_wait_node kernel/locking/qspinlock_paravirt.h:325 [inline]
 __pv_queued_spin_lock_slowpath+0x41b/0xc40 kernel/locking/qspinlock.c:473
 pv_queued_spin_lock_slowpath arch/x86/include/asm/paravirt.h:585 [inline]
 queued_spin_lock_slowpath arch/x86/include/asm/qspinlock.h:51 [inline]
 queued_spin_lock include/asm-generic/qspinlock.h:85 [inline]
 do_raw_spin_lock include/linux/spinlock.h:187 [inline]
 __raw_spin_lock_bh include/linux/spinlock_api_smp.h:136 [inline]
 _raw_spin_lock_bh+0x139/0x1b0 kernel/locking/spinlock.c:178
 __sock_map_delete net/core/sock_map.c:416 [inline]
 sock_map_delete_elem+0x99/0x130 net/core/sock_map.c:448
 bpf_prog_2c29ac5cdc6b1842+0x3a/0x494
 bpf_dispatcher_nop_func include/linux/bpf.h:785 [inline]
 __bpf_prog_run include/linux/filter.h:625 [inline]
 bpf_prog_run include/linux/filter.h:632 [inline]
 __bpf_trace_run kernel/trace/bpf_trace.c:1880 [inline]
 bpf_trace_run2+0xec/0x210 kernel/trace/bpf_trace.c:1917
 __bpf_trace_kfree+0x6f/0x90 include/trace/events/kmem.h:118
 trace_kfree include/trace/events/kmem.h:118 [inline]
 kfree+0x1f3/0x220 mm/slub.c:4569
 syslog_print+0x8fe/0x990 kernel/printk/printk.c:1604
 do_syslog+0x340/0x830 kernel/printk/printk.c:1691
 __do_sys_syslog kernel/printk/printk.c:1783 [inline]
 __se_sys_syslog kernel/printk/printk.c:1781 [inline]
 __x64_sys_syslog+0x7c/0x90 kernel/printk/printk.c:1781
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x61/0xcb
RIP: 0033:0x7f6579987fa7
Code: 73 01 c3 48 8b 0d 81 ce 0c 00 f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 b8 67 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d 51 ce 0c 00 f7 d8 64 89 01 48
RSP: 002b:00007ffd743c8378 EFLAGS: 00000206
 ORIG_RAX: 0000000000000067
RAX: ffffffffffffffda RBX: 00007f6579b264a0 RCX: 00007f6579987fa7
RDX: 00000000000003ff RSI: 00007f6579b264a0 RDI: 0000000000000002
RBP: 0000000000000000 R08: 0000000000000005 R09: 777784ce2d00ac6d
R10: 0000000000004000 R11: 0000000000000206 R12: 00007f6579b264a0
R13: 00007f6579b16212 R14: 00007f6579b26592 R15: 00007f6579b26592
 </TASK>

Crashes (12):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2024/07/18 11:04 android13-5.15-lts db06c48ab67e 0f902625 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-android-5-15 BUG: soft lockup in sys_syslog
2024/05/26 09:22 android13-5.15-lts 424f92bcbe8f a10a183e .config console log report syz C [disk image] [vmlinux] [kernel image] ci2-android-5-15 BUG: soft lockup in sys_syslog
2024/05/19 03:20 android13-5.15-lts 5d96939590c0 c0f1611a .config strace log report syz C [disk image] [vmlinux] [kernel image] ci2-android-5-15-perf BUG: soft lockup in sys_syslog
2024/05/18 18:59 android13-5.15-lts 5d96939590c0 c0f1611a .config console log report syz C [disk image] [vmlinux] [kernel image] ci2-android-5-15-perf BUG: soft lockup in sys_syslog
2024/05/17 08:49 android13-5.15-lts 5d96939590c0 c2e07261 .config strace log report syz C [disk image] [vmlinux] [kernel image] ci2-android-5-15-perf BUG: soft lockup in sys_syslog
2024/05/02 05:23 android13-5.15-lts 5d96939590c0 3ba885bc .config strace log report syz C [disk image] [vmlinux] [kernel image] ci2-android-5-15-perf BUG: soft lockup in sys_syslog
2024/04/10 05:51 android13-5.15-lts 993bed180178 171ec371 .config console log report syz C [disk image] [vmlinux] [kernel image] ci2-android-5-15-perf BUG: soft lockup in sys_syslog
2024/04/09 08:11 android13-5.15-lts 993bed180178 f3234354 .config strace log report syz C [disk image] [vmlinux] [kernel image] ci2-android-5-15-perf BUG: soft lockup in sys_syslog
2024/04/07 08:49 android13-5.15-lts 993bed180178 ca620dd8 .config console log report syz C [disk image] [vmlinux] [kernel image] ci2-android-5-15 BUG: soft lockup in sys_syslog
2024/06/26 15:39 android13-5.15-lts 9044d25b8ff5 c6d33a01 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 BUG: soft lockup in sys_syslog
2024/05/19 20:49 android13-5.15-lts 5d96939590c0 c0f1611a .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 BUG: soft lockup in sys_syslog
2024/04/23 03:15 android13-5.15-lts ad06eaf051cd 36c961ad .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 BUG: soft lockup in sys_syslog
* Struck through repros no longer work on HEAD.