INFO: rcu detected stall in sys_clone3 (2)

Status: auto-obsoleted due to no activity on 2024/08/25 02:20
Subsystems: mm
[Documentation on labels]
First crash: 900d, last: 797d
▶ ▼ Similar bugs (14)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-6.6 INFO: rcu detected stall in clone3 origin:lts-only 1 syz, C inconclusive 2 239d 303d 0/2 upstream: reported C repro on 2025/10/02 07:48
upstream INFO: rcu detected stall in sys_clone3 (3) mm 1 26 503d 698d 0/29 auto-obsoleted due to no activity on 2025/06/14 09:25
linux-6.1 INFO: rcu detected stall in sys_clone3 (3) 1 3 617d 676d 0/3 auto-obsoleted due to no activity on 2025/03/02 13:35
upstream INFO: rcu detected stall in sys_clone3 kernfs 1 1 1532d 1532d 0/29 auto-closed as invalid on 2022/08/20 13:01
linux-5.15 INFO: rcu detected stall in sys_clone3 1 1 666d 666d 0/3 auto-obsoleted due to no activity on 2025/01/12 11:21
linux-5.15 INFO: rcu detected stall in clone3 (2) 1 1 154d 154d 0/3 auto-obsoleted due to no activity on 2026/06/09 00:21
linux-6.1 INFO: rcu detected stall in sys_clone3 1 1 938d 935d 0/3 auto-obsoleted due to no activity on 2024/04/15 06:45
linux-5.15 INFO: rcu detected stall in clone3 1 2 361d 395d 0/3 auto-obsoleted due to no activity on 2025/11/14 02:35
linux-6.1 INFO: rcu detected stall in sys_clone3 (4) 1 1 479d 479d 0/3 auto-obsoleted due to no activity on 2025/07/18 19:29
linux-5.15 INFO: rcu detected stall in sys_clone3 (2) 1 1 533d 533d 0/3 auto-obsoleted due to no activity on 2025/05/25 09:12
linux-6.1 INFO: rcu detected stall in sys_clone3 (2) 1 1 799d 799d 0/3 auto-obsoleted due to no activity on 2024/09/01 21:33
linux-5.15 INFO: rcu detected stall in clone3 (3) 1 1 23d 23d 0/3 upstream: reported on 2026/07/10 04:09
upstream INFO: rcu detected stall in clone3 (6) prio:high mm 1 41 3d08h 66d 0/29 upstream: reported on 2026/05/28 01:12
android-5-10 BUG: soft lockup in sys_clone3 1 1 206d 206d 0/2 auto-obsoleted due to no activity on 2026/04/07 17:52

Sample crash report:
rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1):
 P6406/1:b..l
 P6154/1:b..l

rcu: 	(detected by 1, t=10502 jiffies, g=16069, q=748 ncpus=2)
task:kworker/u8:11   state:R
  running task     stack:24016 pid:6154  tgid:6154  ppid:2      flags:0x00004000
Workqueue: bat_events batadv_nc_worker

Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5408 [inline]
 __schedule+0x17e8/0x4a20 kernel/sched/core.c:6745
 preempt_schedule_notrace+0x100/0x140 kernel/sched/core.c:7017
 preempt_schedule_notrace_thunk+0x1a/0x30 arch/x86/entry/thunk.S:13
 rcu_is_watching+0x7e/0xb0 kernel/rcu/tree.c:725
 rcu_read_lock include/linux/rcupdate.h:782 [inline]
 batadv_nc_purge_orig_hash net/batman-adv/network-coding.c:408 [inline]
 batadv_nc_worker+0x10b/0x610 net/batman-adv/network-coding.c:719
 process_one_work kernel/workqueue.c:3231 [inline]
 process_scheduled_works+0xa2e/0x1830 kernel/workqueue.c:3312
 worker_thread+0x86d/0xd70 kernel/workqueue.c:3393
 kthread+0x2f2/0x390 kernel/kthread.c:389
 ret_from_fork+0x4d/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>
task:syz-executor.0  state:R
  running task     stack:24672 pid:6406  tgid:6406  ppid:5110   flags:0x00000002
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5408 [inline]
 __schedule+0x17e8/0x4a20 kernel/sched/core.c:6745
 preempt_schedule_irq+0xfb/0x1c0 kernel/sched/core.c:7067
 irqentry_exit+0x5e/0x90 kernel/entry/common.c:354
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:__kasan_check_read+0xa/0x20 mm/kasan/shadow.c:31
Code: db eb d0 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 89 f6 48 8b 0c 24 <31> d2 e9 6f e6 ff ff 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00
RSP: 0018:ffffc900096e7758 EFLAGS: 00000256

RAX: 0000000000000000 RBX: 0000000000000001 RCX: ffffffff81725554
RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffffffff8fad43a8
RBP: ffffc900096e78c0 R08: 0000000000000000 R09: 0000000000000000
R10: dffffc0000000000 R11: fffffbfff1f5a876 R12: 1ffff920012dcef4
R13: dffffc0000000000 R14: 0000000000000000 R15: 0000000000000cc0
 instrument_atomic_read include/linux/instrumented.h:68 [inline]
 _test_bit include/asm-generic/bitops/instrumented-non-atomic.h:141 [inline]
 cpumask_test_cpu include/linux/cpumask.h:571 [inline]
 cpu_online include/linux/cpumask.h:1181 [inline]
 trace_lock_acquire include/trace/events/lock.h:24 [inline]
 lock_acquire+0xd4/0x550 kernel/locking/lockdep.c:5725
 rcu_lock_acquire include/linux/rcupdate.h:329 [inline]
 rcu_read_lock include/linux/rcupdate.h:781 [inline]
 get_mem_cgroup_from_objcg+0x36/0x150 include/linux/memcontrol.h:533
 obj_cgroup_charge_pages mm/memcontrol.c:3416 [inline]
 __memcg_kmem_charge_page+0xd1/0x250 mm/memcontrol.c:3444
 memcg_kmem_charge_page include/linux/memcontrol.h:1811 [inline]
 memcg_charge_kernel_stack+0x196/0x550 kernel/fork.c:260
 alloc_thread_stack_node kernel/fork.c:318 [inline]
 dup_task_struct+0x467/0x8c0 kernel/fork.c:1115
 copy_process+0x5d1/0x3dc0 kernel/fork.c:2220
 kernel_clone+0x226/0x8f0 kernel/fork.c:2797
 __do_sys_clone3 kernel/fork.c:3098 [inline]
 __se_sys_clone3+0x2cb/0x350 kernel/fork.c:3082
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7efe8e0a8cd9
RSP: 002b:00007fffb0684128 EFLAGS: 00000202
 ORIG_RAX: 00000000000001b3
RAX: ffffffffffffffda RBX: 00007efe8e0513b0 RCX: 00007efe8e0a8cd9
RDX: 00007efe8e0513b0 RSI: 0000000000000058 RDI: 00007fffb0684170
RBP: 00007efe8ed306c0 R08: 00007efe8ed306c0 R09: 00007fffb0684257
R10: 0000000000000008 R11: 0000000000000202 R12: ffffffffffffffb0
R13: 000000000000006e R14: 00007fffb0684170 R15: 00007fffb0684258
 </TASK>
rcu: rcu_preempt kthread starved for 10631 jiffies! g16069 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->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:R
  running task     stack:26960 pid:17    tgid:17    ppid:2      flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5408 [inline]
 __schedule+0x17e8/0x4a20 kernel/sched/core.c:6745
 __schedule_loop kernel/sched/core.c:6822 [inline]
 schedule+0x14b/0x320 kernel/sched/core.c:6837
 schedule_timeout+0x1be/0x310 kernel/time/timer.c:2581
 rcu_gp_fqs_loop+0x2df/0x1330 kernel/rcu/tree.c:2000
 rcu_gp_kthread+0xa7/0x3b0 kernel/rcu/tree.c:2202
 kthread+0x2f2/0x390 kernel/kthread.c:389
 ret_from_fork+0x4d/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>
rcu: Stack dump where RCU GP kthread last ran:
CPU: 1 PID: 0 Comm: swapper/1 Not tainted 6.9.0-syzkaller-12400-g6fbf71854e2d #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/02/2024
RIP: 0010:native_irq_disable arch/x86/include/asm/irqflags.h:37 [inline]
RIP: 0010:arch_local_irq_disable arch/x86/include/asm/irqflags.h:72 [inline]
RIP: 0010:acpi_safe_halt+0x21/0x30 drivers/acpi/processor_idle.c:113
Code: 90 90 90 90 90 90 90 90 90 65 48 8b 04 25 00 d5 03 00 48 f7 00 08 00 00 00 75 10 eb 07 0f 00 2d b5 23 a3 00 f3 0f 1e fa fb f4 <fa> e9 54 e3 29 00 66 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90
RSP: 0018:ffffc900001a7d08 EFLAGS: 00000246

RAX: ffff8880176e0000 RBX: ffff8880182eb864 RCX: 000000000008f499
RDX: 0000000000000001 RSI: ffff8880182eb800 RDI: ffff8880182eb864
RBP: 000000000003a5b8 R08: ffff8880b9537d0b R09: 1ffff110172a6fa1
R10: dffffc0000000000 R11: ffffffff8b865960 R12: ffff88801bf90800
R13: 0000000000000000 R14: 0000000000000001 R15: ffffffff8eace200
FS:  0000000000000000(0000) GS:ffff8880b9500000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f769b4a1897 CR3: 0000000011d22000 CR4: 0000000000350ef0
Call Trace:
 <IRQ>
 </IRQ>
 <TASK>
 acpi_idle_enter+0xe4/0x140 drivers/acpi/processor_idle.c:707
 cpuidle_enter_state+0x114/0x480 drivers/cpuidle/cpuidle.c:267
 cpuidle_enter+0x5d/0xa0 drivers/cpuidle/cpuidle.c:388
 call_cpuidle kernel/sched/idle.c:155 [inline]
 cpuidle_idle_call kernel/sched/idle.c:236 [inline]
 do_idle+0x375/0x5d0 kernel/sched/idle.c:332
 cpu_startup_entry+0x42/0x60 kernel/sched/idle.c:430
 start_secondary+0x100/0x100 arch/x86/kernel/smpboot.c:313
 common_startup_64+0x13e/0x147
 </TASK>

Crashes (3):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2024/05/27 02:10 upstream 6fbf71854e2d a10a183e .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root INFO: rcu detected stall in sys_clone3
2024/04/25 15:44 upstream e88c4cfcb7b8 8bdc0f22 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root INFO: rcu detected stall in sys_clone3
2024/02/13 13:52 upstream c664e16bb1ba e66542d7 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce INFO: rcu detected stall in sys_clone3
* Struck through repros no longer work on HEAD.