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INFO: rcu detected stall in x64_sys_call

Status: upstream: reported syz repro on 2024/09/09 20:48
Subsystems: mm
[Documentation on labels]
Reported-by: syzbot+65203730e781d98f23a0@syzkaller.appspotmail.com
First crash: 409d, last: 1d22h
Cause bisection: failed (error log, bisect log)
  
▶ ▼ Discussions (5)
Title Replies (including bot) Last reply
[syzbot] Monthly input report (Feb 2025) 0 (1) 2025/02/05 12:43
[syzbot] Monthly input report (Jan 2025) 0 (1) 2025/01/06 10:01
[syzbot] Monthly input report (Dec 2024) 0 (1) 2024/12/05 09:04
[syzbot] Monthly input report (Nov 2024) 0 (1) 2024/11/04 08:58
[syzbot] [mm?] INFO: rcu detected stall in x64_sys_call 0 (2) 2024/10/02 04:18
▶ ▼ Similar bugs (5)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-5.15 INFO: rcu detected stall in x64_sys_call 1 1 383d 383d 0/3 auto-obsoleted due to no activity on 2024/10/06 02:18
android-6-12 BUG: soft lockup in x64_sys_call 1 3 4d08h 22d 0/1 premoderation: reported on 2025/06/23 18:09
linux-6.1 INFO: rcu detected stall in x64_sys_call 1 1 74d 74d 0/3 upstream: reported on 2025/05/03 06:03
android-5-15 BUG: soft lockup in x64_sys_call origin:upstream 1 C 26 4d15h 325d 0/2 upstream: reported C repro on 2024/08/25 04:51
android-6-1 BUG: soft lockup in x64_sys_call origin:upstream 1 syz 2 24d 155d 0/2 premoderation: reported syz repro on 2025/02/10 08:39
▶ ▼ Last patch testing requests (5)
Created Duration User Patch Repo Result
2025/02/28 00:09 1h29m retest repro https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git usb-testing log
2025/02/28 00:09 1h28m retest repro https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git usb-testing OK log
2025/02/28 00:09 13m retest repro https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git usb-testing OK log
2025/02/28 00:09 14m retest repro https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git usb-testing OK log
2025/02/27 22:50 19m retest repro upstream report log

Sample crash report:
rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	1-...!: (1 ticks this GP) idle=1b1c/1/0x4000000000000000 softirq=17934/17934 fqs=0
rcu: 	(detected by 0, t=10502 jiffies, g=8529, q=936 ncpus=2)
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 6110 Comm: syz.2.21 Not tainted 6.16.0-rc5-syzkaller-00121-gbc9ff192a6c9 #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
RIP: 0010:lock_release+0x19a/0x2f0 kernel/locking/lockdep.c:5896
Code: 08 01 00 00 41 f7 c5 00 02 00 00 74 01 fb 48 8b 44 24 10 65 48 2b 05 8d 26 38 12 0f 85 58 01 00 00 48 83 c4 18 5b 41 5c 41 5d <41> 5e 41 5f e9 cd 99 f2 09 65 8b 05 9a 26 38 12 83 f8 07 0f 87 12
RSP: 0018:ffffc90000a08d68 EFLAGS: 00000096
RAX: 0000000000000000 RBX: ffff8880788682e8 RCX: ffffc90000a08d44
RDX: 0000000000000002 RSI: ffffffff8de0d4e5 RDI: ffffffff8c158f60
RBP: ffff88805b302c00 R08: 0000000000000004 R09: 0000000000000002
R10: 0000000000000002 R11: 0000000000000001 R12: 1a3b94a1e8000000
R13: 1a3b94a1e8000000 R14: ffff88802610c880 R15: 0000000000000003
FS:  0000000000000000(0000) GS:ffff888124815000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffd82c38510 CR3: 00000000768a6000 CR4: 00000000003526f0
Call Trace:
 <IRQ>
 __raw_spin_unlock include/linux/spinlock_api_smp.h:141 [inline]
 _raw_spin_unlock+0x16/0x50 kernel/locking/spinlock.c:186
 spin_unlock include/linux/spinlock.h:391 [inline]
 advance_sched+0x62b/0xc80 net/sched/sch_taprio.c:981
 __run_hrtimer kernel/time/hrtimer.c:1761 [inline]
 __hrtimer_run_queues+0x202/0xad0 kernel/time/hrtimer.c:1825
 hrtimer_interrupt+0x397/0x8e0 kernel/time/hrtimer.c:1887
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1039 [inline]
 __sysvec_apic_timer_interrupt+0x10b/0x3f0 arch/x86/kernel/apic/apic.c:1056
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1050 [inline]
 sysvec_apic_timer_interrupt+0x9f/0xc0 arch/x86/kernel/apic/apic.c:1050
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:unwind_next_frame+0xe66/0x20a0 arch/x86/kernel/unwind_orc.c:664
Code: 85 0f 0d 00 00 49 89 6d 40 48 b8 00 00 00 00 00 fc ff df 4c 89 ea 48 c1 ea 03 0f b6 04 02 84 c0 74 08 3c 03 0f 8e c6 0c 00 00 <41> 39 5d 00 0f 84 91 07 00 00 bd 01 00 00 00 e9 5f f5 ff ff ba 28
RSP: 0018:ffffc900033c75e8 EFLAGS: 00000246
RAX: 0000000000000000 RBX: 0000000000000001 RCX: ffffc900033c8000
RDX: 1ffff92000678ecb RSI: ffffc900033c7a80 RDI: ffffc900033c7698
RBP: ffff88806e6fa780 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: 000000000001103e R12: ffffc900033c76a8
R13: ffffc900033c7658 R14: ffffc900033c7ab0 R15: ffffc900033c768c
 arch_stack_walk+0x94/0x100 arch/x86/kernel/stacktrace.c:25
 stack_trace_save+0x8e/0xc0 kernel/stacktrace.c:122
 kasan_save_stack+0x33/0x60 mm/kasan/common.c:47
 kasan_record_aux_stack+0xa7/0xc0 mm/kasan/generic.c:548
 slab_free_hook mm/slub.c:2342 [inline]
 slab_free mm/slub.c:4643 [inline]
 kmem_cache_free+0x15a/0x4d0 mm/slub.c:4745
 anon_vma_free mm/rmap.c:137 [inline]
 __put_anon_vma+0x114/0x3a0 mm/rmap.c:2756
 put_anon_vma include/linux/rmap.h:117 [inline]
 unlink_anon_vmas+0x58a/0x820 mm/rmap.c:444
 free_pgtables+0x373/0xcb0 mm/memory.c:402
 exit_mmap+0x3fb/0xb90 mm/mmap.c:1295
 __mmput+0x12a/0x410 kernel/fork.c:1121
 mmput+0x62/0x70 kernel/fork.c:1144
 exit_mm kernel/exit.c:581 [inline]
 do_exit+0x7c4/0x2bd0 kernel/exit.c:952
 do_group_exit+0xd3/0x2a0 kernel/exit.c:1105
 __do_sys_exit_group kernel/exit.c:1116 [inline]
 __se_sys_exit_group kernel/exit.c:1114 [inline]
 __x64_sys_exit_group+0x3e/0x50 kernel/exit.c:1114
 x64_sys_call+0x1530/0x1730 arch/x86/include/generated/asm/syscalls_64.h:232
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xcd/0x4c0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f31dff8e929
Code: Unable to access opcode bytes at 0x7f31dff8e8ff.
RSP: 002b:00007ffc3dd612b8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f31dff8e929
RDX: 0000000000000064 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007ffc3dd6131c R08: 000000053dd613af R09: 00000000000927c0
R10: 0000000000000001 R11: 0000000000000246 R12: 0000000000000001
R13: 00000000000927c0 R14: 0000000000015b0f R15: 00007ffc3dd61370
 </TASK>
rcu: rcu_preempt kthread timer wakeup didn't happen for 10501 jiffies! g8529 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: 	Possible timer handling issue on cpu=1 timer-softirq=2960
rcu: rcu_preempt kthread starved for 10502 jiffies! g8529 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->cpu=1
rcu: 	Unless rcu_preempt kthread gets sufficient CPU time, OOM is now expected behavior.
rcu: RCU grace-period kthread stack dump:
task:rcu_preempt     state:I stack:27784 pid:16    tgid:16    ppid:2      task_flags:0x208040 flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5401 [inline]
 __schedule+0x116a/0x5de0 kernel/sched/core.c:6790
 __schedule_loop kernel/sched/core.c:6868 [inline]
 schedule+0xe7/0x3a0 kernel/sched/core.c:6883
 schedule_timeout+0x123/0x290 kernel/time/sleep_timeout.c:99
 rcu_gp_fqs_loop+0x1ea/0xb00 kernel/rcu/tree.c:2054
 rcu_gp_kthread+0x270/0x380 kernel/rcu/tree.c:2256
 kthread+0x3c5/0x780 kernel/kthread.c:464
 ret_from_fork+0x5d7/0x6f0 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>

Crashes (321):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2025/07/11 04:56 upstream bc9ff192a6c9 3cda49cf .config console log report syz / log [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root INFO: rcu detected stall in x64_sys_call
2025/07/01 08:47 upstream 66701750d556 6e83b42d .config console log report syz / log [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce INFO: rcu detected stall in x64_sys_call
2025/03/22 14:52 upstream 88d324e69ea9 c6512ef7 .config console log report syz / log [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce INFO: rcu detected stall in x64_sys_call
2025/03/13 04:33 upstream 0fed89a961ea 1a5d9317 .config console log report syz / log [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root INFO: rcu detected stall in x64_sys_call
2025/02/02 15:19 upstream 69e858e0b8b2 568559e4 .config console log report syz / log [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root INFO: rcu detected stall in x64_sys_call
2024/10/19 11:09 https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git usb-testing 07b887f8236e cd6fc0a3 .config console log report syz / log [disk image] [vmlinux] [kernel image] ci2-upstream-usb INFO: rcu detected stall in x64_sys_call
2025/07/14 09:16 upstream 5d5d62298b8b 3cda49cf .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root INFO: rcu detected stall in x64_sys_call
2025/07/10 08:21 upstream 8c2e52ebbe88 956bd956 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root INFO: rcu detected stall in x64_sys_call
2025/07/09 20:38 upstream 733923397fd9 f4e5e155 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root INFO: rcu detected stall in x64_sys_call
2025/07/08 12:33 upstream d7b8f8e20813 4f67c4ae .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root INFO: rcu detected stall in x64_sys_call
2025/07/07 15:37 upstream d7b8f8e20813 4f67c4ae .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root INFO: rcu detected stall in x64_sys_call
2025/07/03 20:26 upstream 17bbde2e1716 115ceea7 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root INFO: rcu detected stall in x64_sys_call
2025/07/03 08:30 upstream b4911fb0b060 115ceea7 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root INFO: rcu detected stall in x64_sys_call
2025/06/27 09:21 upstream e34a79b96ab9 803ce19b .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root INFO: rcu detected stall in x64_sys_call
2025/06/27 05:47 upstream e34a79b96ab9 803ce19b .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root INFO: rcu detected stall in x64_sys_call
2025/06/24 17:39 upstream 78f4e737a53e 26d77996 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root INFO: rcu detected stall in x64_sys_call
2025/06/17 17:51 upstream 9afe652958c3 417d98fa .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce INFO: rcu detected stall in x64_sys_call
2025/06/17 10:32 upstream 9afe652958c3 417d98fa .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root INFO: rcu detected stall in x64_sys_call
2025/06/16 14:02 upstream e04c78d86a96 d1716036 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root INFO: rcu detected stall in x64_sys_call
2025/06/16 11:01 upstream e04c78d86a96 5f4b362d .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root INFO: rcu detected stall in x64_sys_call
2025/06/15 19:51 upstream 08215f5486ec 5f4b362d .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce INFO: rcu detected stall in x64_sys_call
2025/06/15 17:55 upstream 08215f5486ec 5f4b362d .config console log report info [disk image] [vmlinux] [kernel image] ci-qemu-gce-upstream-auto INFO: rcu detected stall in x64_sys_call
2025/06/14 15:46 upstream 4774cfe3543a 5f4b362d .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root INFO: rcu detected stall in x64_sys_call
2025/06/13 22:30 upstream 02adc1490e6d 0e8da31f .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root INFO: rcu detected stall in x64_sys_call
2025/06/13 02:55 upstream 27605c8c0f69 98683f8f .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root INFO: rcu detected stall in x64_sys_call
2025/06/12 23:43 upstream 27605c8c0f69 98683f8f .config console log report info [disk image] [vmlinux] [kernel image] ci-qemu-gce-upstream-auto INFO: rcu detected stall in x64_sys_call
2025/06/12 07:30 upstream 488ef3560196 98683f8f .config console log report info [disk image] [vmlinux] [kernel image] ci-qemu-gce-upstream-auto INFO: rcu detected stall in x64_sys_call
2025/06/11 02:54 upstream aef17cb3d3c4 5d7e17ca .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root INFO: rcu detected stall in x64_sys_call
2025/06/10 13:10 upstream f09079bd04a9 5d7e17ca .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root INFO: rcu detected stall in x64_sys_call
2025/06/09 22:31 upstream 19272b37aa4f 4826c28e .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root INFO: rcu detected stall in x64_sys_call
2025/06/08 02:07 upstream 5b032cac6225 4826c28e .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root INFO: rcu detected stall in x64_sys_call
2025/06/07 22:27 upstream 5b032cac6225 4826c28e .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root INFO: rcu detected stall in x64_sys_call
2025/06/07 19:57 upstream 5b032cac6225 4826c28e .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root INFO: rcu detected stall in x64_sys_call
2025/06/07 12:56 upstream 7a912d04415b 4826c28e .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root INFO: rcu detected stall in x64_sys_call
2025/06/07 03:31 upstream 7a912d04415b f61267d4 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root INFO: rcu detected stall in x64_sys_call
2025/06/06 05:28 upstream cfc4ca8986bb 6b6b5f21 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root INFO: rcu detected stall in x64_sys_call
2025/06/05 07:04 upstream 64980441d269 6b6b5f21 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root INFO: rcu detected stall in x64_sys_call
2025/06/04 17:02 upstream 5abc7438f1e9 fd5e6e61 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root INFO: rcu detected stall in x64_sys_call
2025/06/04 04:44 upstream 5abc7438f1e9 a30356b7 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root INFO: rcu detected stall in x64_sys_call
2025/06/03 20:01 upstream 546b1c9e93c2 a30356b7 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root INFO: rcu detected stall in x64_sys_call
2025/06/01 16:20 upstream 7d4e49a77d99 3d2f584d .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root INFO: rcu detected stall in x64_sys_call
2025/05/31 08:13 upstream 8477ab143069 3d2f584d .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root INFO: rcu detected stall in x64_sys_call
2025/05/30 23:45 upstream 8477ab143069 3d2f584d .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root INFO: rcu detected stall in x64_sys_call
2025/05/26 20:41 upstream 0ff41df1cb26 874a1386 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root INFO: rcu detected stall in x64_sys_call
2025/05/26 07:42 upstream 0f8c0258bf04 2d4582d0 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root INFO: rcu detected stall in x64_sys_call
2025/05/25 21:47 upstream 0f8c0258bf04 ed351ea7 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root INFO: rcu detected stall in x64_sys_call
2025/05/25 15:24 upstream d0c22de9995b ed351ea7 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root INFO: rcu detected stall in x64_sys_call
2025/05/24 23:43 upstream b1427432d3b6 ed351ea7 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root INFO: rcu detected stall in x64_sys_call
2024/09/09 08:12 upstream 89f5e14d05b4 9750182a .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root INFO: rcu detected stall in x64_sys_call
2024/09/05 20:42 upstream c763c4339688 464ac2ed .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root INFO: rcu detected stall in x64_sys_call
2024/08/22 13:31 upstream 872cf28b8df9 295a4b50 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root INFO: rcu detected stall in x64_sys_call
2025/07/11 17:41 upstream bc9ff192a6c9 3cda49cf .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-386 INFO: rcu detected stall in x64_sys_call
2025/07/07 02:14 net b9fd9888a565 4f67c4ae .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce INFO: rcu detected stall in x64_sys_call
2025/03/23 19:12 net-next bfc17c165835 4e8d3850 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce INFO: rcu detected stall in x64_sys_call
2025/06/19 09:31 linux-next 6e5ab6fee68d ed3e87f7 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root INFO: rcu detected stall in x64_sys_call
2025/06/15 21:32 linux-next bc6e0ba6c9ba 5f4b362d .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root INFO: rcu detected stall in x64_sys_call
2025/06/03 13:48 linux-next a0bea9e39035 a30356b7 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root INFO: rcu detected stall in x64_sys_call
2024/10/31 18:41 https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git usb-testing c67e9601e29a 96eb609f .config console log report syz / log [disk image] [vmlinux] [kernel image] ci2-upstream-usb INFO: rcu detected stall in x64_sys_call
2024/10/25 10:46 https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git usb-testing c6d9e43954bf c79b8ca5 .config console log report syz / log [disk image] [vmlinux] [kernel image] ci2-upstream-usb INFO: rcu detected stall in x64_sys_call
2024/10/02 04:17 https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git usb-testing 9852d85ec9d4 ea2b66a6 .config console log report syz / log [disk image] [vmlinux] [kernel image] ci2-upstream-usb INFO: rcu detected stall in x64_sys_call
* Struck through repros no longer work on HEAD.