syzbot


BUG: soft lockup in call_timer_fn

Status: upstream: reported on 2024/06/17 22:49
Subsystems: mm
[Documentation on labels]
Reported-by: syzbot+7b5fc3357809198870e3@syzkaller.appspotmail.com
First crash: 76d, last: 3h45m
Discussions (1)
Title Replies (including bot) Last reply
[syzbot] [net?] [pm?] BUG: soft lockup in call_timer_fn 0 (1) 2024/06/17 22:49
Similar bugs (10)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-4.14 BUG: soft lockup in call_timer_fn 1 1654d 1654d 0/1 auto-closed as invalid on 2020/05/10 07:38
linux-4.19 BUG: soft lockup in call_timer_fn C error 31 506d 1109d 0/1 upstream: reported C repro on 2021/07/10 02:48
upstream INFO: rcu detected stall in call_timer_fn (2) kernel C done error 47 916d 1772d 0/27 closed as invalid on 2022/02/08 10:46
upstream INFO: rcu detected stall in call_timer_fn (4) mm 1 173d 173d 0/27 auto-obsoleted due to no activity on 2024/03/31 10:44
upstream INFO: rcu detected stall in call_timer_fn (3) kernel 3 655d 670d 0/27 auto-obsoleted due to no activity on 2023/01/12 18:45
linux-4.19 INFO: rcu detected stall in call_timer_fn (2) 16 1356d 1630d 0/1 auto-closed as invalid on 2021/03/04 12:30
linux-4.14 INFO: rcu detected stall in call_timer_fn (2) 1 1419d 1419d 0/1 auto-closed as invalid on 2020/12/31 22:00
upstream INFO: rcu detected stall in call_timer_fn bpf net 2 2109d 2122d 0/27 closed as dup on 2019/01/02 16:26
linux-4.19 INFO: rcu detected stall in call_timer_fn 1 1770d 1770d 0/1 auto-closed as invalid on 2020/01/15 18:43
linux-4.14 INFO: rcu detected stall in call_timer_fn 5 1543d 1663d 0/1 auto-closed as invalid on 2020/08/29 09:07

Sample crash report:
watchdog: BUG: soft lockup - CPU#0 stuck for 246s! [kworker/u8:8:1096]
Modules linked in:
irq event stamp: 18717831
hardirqs last  enabled at (18717830): [<ffffffff8ae04d12>] __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:151 [inline]
hardirqs last  enabled at (18717830): [<ffffffff8ae04d12>] _raw_spin_unlock_irqrestore+0x52/0x80 kernel/locking/spinlock.c:194
hardirqs last disabled at (18717831): [<ffffffff8adc9dee>] sysvec_apic_timer_interrupt+0xe/0xb0 arch/x86/kernel/apic/apic.c:1043
softirqs last  enabled at (18717822): [<ffffffff815361de>] softirq_handle_end kernel/softirq.c:400 [inline]
softirqs last  enabled at (18717822): [<ffffffff815361de>] handle_softirqs+0x5be/0x8f0 kernel/softirq.c:582
softirqs last disabled at (18717825): [<ffffffff81536fab>] __do_softirq kernel/softirq.c:588 [inline]
softirqs last disabled at (18717825): [<ffffffff81536fab>] invoke_softirq kernel/softirq.c:428 [inline]
softirqs last disabled at (18717825): [<ffffffff81536fab>] __irq_exit_rcu kernel/softirq.c:637 [inline]
softirqs last disabled at (18717825): [<ffffffff81536fab>] irq_exit_rcu+0xbb/0x120 kernel/softirq.c:649
CPU: 0 PID: 1096 Comm: kworker/u8:8 Not tainted 6.9.0-rc7-syzkaller-00012-gdccb07f2914c #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024
Workqueue: events_unbound toggle_allocation_gate
RIP: 0010:trace_timer_expire_exit include/trace/events/timer.h:127 [inline]
RIP: 0010:call_timer_fn+0x4b6/0x610 kernel/time/timer.c:1794
Code: ee e8 ae 24 13 00 45 84 ed 0f 84 8b fc ff ff e8 20 2a 13 00 e8 bb b8 84 ff e9 88 fc ff ff e8 11 2a 13 00 e8 cc 9a f9 ff 31 ff <89> c5 89 c6 e8 81 24 13 00 40 84 ed 0f 85 3c fd ff ff e8 f3 29 13
RSP: 0018:ffffc90000007c70 EFLAGS: 00000246
RAX: 0000000000000001 RBX: ffffc90000007cb0 RCX: ffffffff817be08b
RDX: 0000000000000000 RSI: ffffffff8b8f8360 RDI: 0000000000000000
RBP: 0000000000000001 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000001 R11: ffffffff8b2f3800 R12: 1ffff92000000f90
R13: 0000000000000001 R14: 0000000000000101 R15: 000000000003d7cc
FS:  0000000000000000(0000) GS:ffff8880b9400000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2e728000 CR3: 000000000d77a000 CR4: 0000000000350ef0
Call Trace:
 <IRQ>
 expire_timers kernel/time/timer.c:1844 [inline]
 __run_timers+0x74b/0xaf0 kernel/time/timer.c:2418
 __run_timer_base kernel/time/timer.c:2429 [inline]
 __run_timer_base kernel/time/timer.c:2422 [inline]
 run_timer_base+0x111/0x190 kernel/time/timer.c:2438
 run_timer_softirq+0x1a/0x40 kernel/time/timer.c:2448
 handle_softirqs+0x219/0x8f0 kernel/softirq.c:554
 __do_softirq kernel/softirq.c:588 [inline]
 invoke_softirq kernel/softirq.c:428 [inline]
 __irq_exit_rcu kernel/softirq.c:637 [inline]
 irq_exit_rcu+0xbb/0x120 kernel/softirq.c:649
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1043 [inline]
 sysvec_apic_timer_interrupt+0x95/0xb0 arch/x86/kernel/apic/apic.c:1043
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:check_kcov_mode kernel/kcov.c:173 [inline]
RIP: 0010:__sanitizer_cov_trace_pc+0x1c/0x60 kernel/kcov.c:207
Code: 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 65 48 8b 15 64 ca 74 7e 65 8b 05 65 ca 74 7e a9 00 01 ff 00 48 8b 34 24 <74> 0f f6 c4 01 74 35 8b 82 14 16 00 00 85 c0 74 2b 8b 82 f0 15 00
RSP: 0018:ffffc90004407908 EFLAGS: 00000246
RAX: 0000000000000001 RBX: ffff8880b9544740 RCX: ffffffff818305bb
RDX: ffff888022045a00 RSI: ffffffff81830595 RDI: 0000000000000005
RBP: 0000000000000003 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000006 R12: ffffed10172a88e9
R13: 0000000000000001 R14: ffff8880b9544748 R15: ffff8880b943fc40
 rep_nop arch/x86/include/asm/vdso/processor.h:13 [inline]
 cpu_relax arch/x86/include/asm/vdso/processor.h:18 [inline]
 csd_lock_wait kernel/smp.c:311 [inline]
 smp_call_function_many_cond+0x4e5/0x1420 kernel/smp.c:855
 on_each_cpu_cond_mask+0x40/0x90 kernel/smp.c:1023
 on_each_cpu include/linux/smp.h:71 [inline]
 text_poke_sync arch/x86/kernel/alternative.c:2086 [inline]
 text_poke_bp_batch+0x22b/0x760 arch/x86/kernel/alternative.c:2296
 text_poke_flush arch/x86/kernel/alternative.c:2487 [inline]
 text_poke_flush arch/x86/kernel/alternative.c:2484 [inline]
 text_poke_finish+0x30/0x40 arch/x86/kernel/alternative.c:2494
 arch_jump_label_transform_apply+0x1c/0x30 arch/x86/kernel/jump_label.c:146
 jump_label_update+0x1d7/0x400 kernel/jump_label.c:829
 static_key_disable_cpuslocked+0x154/0x1c0 kernel/jump_label.c:235
 static_key_disable+0x1a/0x20 kernel/jump_label.c:243
 toggle_allocation_gate mm/kfence/core.c:831 [inline]
 toggle_allocation_gate+0x143/0x250 mm/kfence/core.c:818
 process_one_work+0x9ac/0x1ac0 kernel/workqueue.c:3267
 process_scheduled_works kernel/workqueue.c:3348 [inline]
 worker_thread+0x6c8/0xf70 kernel/workqueue.c:3429
 kthread+0x2c4/0x3a0 kernel/kthread.c:388
 ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 17281 Comm: syz-executor.1 Not tainted 6.9.0-rc7-syzkaller-00012-gdccb07f2914c #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024
RIP: 0010:advance_sched+0x5ad/0xc60 net/sched/sch_taprio.c:976
Code: 00 00 00 00 74 18 e8 92 86 9f f8 49 8d bf 00 01 00 00 48 c7 c6 c0 e5 ee 88 e8 ff 53 87 f8 e8 7a 86 9f f8 49 8d bd 50 01 00 00 <48> b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 0f
RSP: 0018:ffffc90000a08d80 EFLAGS: 00000046
RAX: 0000000080010002 RBX: 17cd302767294ecf RCX: ffffffff88ef84ff
RDX: ffff888022fdda00 RSI: ffffffff88ef86d6 RDI: ffff88807a839150
RBP: ffff88807a839010 R08: 0000000000000004 R09: 0000000000000002
R10: 0000000000000002 R11: 0000000000000001 R12: 0000000000000002
R13: ffff88807a839000 R14: ffff88802195f340 R15: ffff88807a83a400
FS:  00007fd4376336c0(0000) GS:ffff8880b9500000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f89c21ad988 CR3: 000000002b270000 CR4: 0000000000350ef0
Call Trace:
 <NMI>
 </NMI>
 <IRQ>
 __run_hrtimer kernel/time/hrtimer.c:1692 [inline]
 __hrtimer_run_queues+0x20f/0xcc0 kernel/time/hrtimer.c:1756
 hrtimer_interrupt+0x31b/0x800 kernel/time/hrtimer.c:1818
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1032 [inline]
 __sysvec_apic_timer_interrupt+0x112/0x450 arch/x86/kernel/apic/apic.c:1049
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1043 [inline]
 sysvec_apic_timer_interrupt+0x90/0xb0 arch/x86/kernel/apic/apic.c:1043
 </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 56 db 8c f6 48 89 df e8 ae 57 8d f6 f7 c5 00 02 00 00 75 23 9c 58 f6 c4 02 75 37 <bf> 01 00 00 00 e8 95 92 7e f6 65 8b 05 c6 8a 23 75 85 c0 74 16 5b
RSP: 0018:ffffc9000e39fa28 EFLAGS: 00000246
RAX: 0000000000000002 RBX: ffff88801c286088 RCX: 1ffffffff1f7fcd1
RDX: 0000000000000000 RSI: ffffffff8b2cbf40 RDI: ffffffff8b8f83e0
RBP: 0000000000000283 R08: 0000000000000001 R09: 0000000000000001
R10: ffffffff8fc02917 R11: ffffffff936de7e0 R12: dffffc0000000000
R13: 19aa02f4ae83767b R14: 17cd2ca4ae83767b R15: ffff88801c286088
 spin_unlock_irqrestore include/linux/spinlock.h:406 [inline]
 timerfd_clock_was_set+0x164/0x310 fs/timerfd.c:113
 clock_was_set+0x67c/0x850 kernel/time/hrtimer.c:983
 timekeeping_inject_offset+0x4d1/0x640 kernel/time/timekeeping.c:1396
 do_adjtimex+0x373/0xaa0 kernel/time/timekeeping.c:2445
 do_clock_adjtime kernel/time/posix-timers.c:1159 [inline]
 __do_sys_clock_adjtime+0x176/0x290 kernel/time/posix-timers.c:1171
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcf/0x260 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fd43687dca9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 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:00007fd4376330c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000131
RAX: ffffffffffffffda RBX: 00007fd4369abf80 RCX: 00007fd43687dca9
RDX: 0000000000000000 RSI: 0000000020000040 RDI: 0000000000000000
RBP: 00007fd4368c947e R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000000b R14: 00007fd4369abf80 R15: 00007ffc2cd9c1e8
 </TASK>

Crashes (16):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2024/05/07 10:22 upstream dccb07f2914c c035c6de .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-badwrites-root BUG: soft lockup in call_timer_fn
2024/07/05 13:15 upstream 661e504db04c 2a40360c .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root INFO: rcu detected stall in call_timer_fn
2024/06/28 01:44 upstream 6d6444ba8205 b62c7d46 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root INFO: rcu detected stall in call_timer_fn
2024/06/22 13:38 upstream 35bb670d65fc edc5149a .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root INFO: rcu detected stall in call_timer_fn
2024/05/25 19:21 upstream 56fb6f92854f a10a183e .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root INFO: rcu detected stall in call_timer_fn
2024/06/17 22:48 upstream 2ccbdf43d5e7 1f11cfd7 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-386 INFO: rcu detected stall in call_timer_fn
2024/06/05 02:25 upstream 32f88d65f01b e1e2c66e .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-386 INFO: rcu detected stall in call_timer_fn
2024/05/28 01:00 upstream 2bfcfd584ff5 f550015e .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-386 INFO: rcu detected stall in call_timer_fn
2024/07/23 02:16 linux-next 41c196e567fb f063dfd9 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root INFO: rcu detected stall in call_timer_fn
2024/07/23 00:36 https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git usb-testing 933069701c1b 708c10c4 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-usb INFO: rcu detected stall in call_timer_fn
2024/07/08 03:59 https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git usb-testing 179264157bba 2a40360c .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-usb INFO: rcu detected stall in call_timer_fn
2024/07/07 21:29 https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git usb-testing 179264157bba 2a40360c .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-usb INFO: rcu detected stall in call_timer_fn
2024/07/07 07:35 https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git usb-testing 179264157bba 2a40360c .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-usb INFO: rcu detected stall in call_timer_fn
2024/07/05 21:36 https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git usb-testing 179264157bba 2a40360c .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-usb INFO: rcu detected stall in call_timer_fn
2024/07/01 22:28 https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git usb-testing f7697db8b1b3 b294e901 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-usb INFO: rcu detected stall in call_timer_fn
2024/06/29 20:09 https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git usb-testing 2ea6d07efe53 757f06b1 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-usb INFO: rcu detected stall in call_timer_fn
* Struck through repros no longer work on HEAD.