INFO: rcu detected stall in call_usermodehelper_exec

Kernel	Title	Rank 🛈	Count	Last	Reported	Patched	Status
linux-6.1	INFO: rcu detected stall in call_usermodehelper_exec_async (2)	1	1	18d	18d	0/3	upstream: reported on 2025/06/23 17:46
linux-6.1	INFO: rcu detected stall in call_usermodehelper_exec_async	1	1	399d	399d	0/3	auto-obsoleted due to no activity on 2024/09/16 03:00
linux-5.15	INFO: rcu detected stall in call_usermodehelper_exec_async	1	1	741d	741d	0/3	auto-obsoleted due to no activity on 2023/10/09 16:55
upstream	INFO: rcu detected stall in call_usermodehelper_exec_async (3) mm	1	23	148d	644d	0/29	auto-obsoleted due to no activity on 2025/05/14 21:52
upstream	INFO: rcu detected stall in call_usermodehelper_exec_async (2) cgroups mm	1	1	1138d	1138d	0/29	auto-closed as invalid on 2022/08/28 20:38

rcu: INFO: rcu_preempt self-detected stall on CPU rcu: 1-...!: (10499 ticks this GP) idle=c96/1/0x4000000000000002 softirq=12095/12095 fqs=5 (t=10500 jiffies g=6397 q=248) rcu: rcu_preempt kthread starved for 10490 jiffies! g6397 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=0 rcu: RCU grace-period kthread stack dump: rcu_preempt R running task 29104 10 2 0x80004000 Call Trace: context_switch kernel/sched/core.c:3385 [inline] __schedule+0x9a0/0xcc0 kernel/sched/core.c:4081 schedule+0x181/0x210 kernel/sched/core.c:4155 schedule_timeout+0x14f/0x240 kernel/time/timer.c:1895 rcu_gp_fqs_loop kernel/rcu/tree.c:1661 [inline] rcu_gp_kthread+0xed8/0x1770 kernel/rcu/tree.c:1821 kthread+0x332/0x350 kernel/kthread.c:255 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352 NMI backtrace for cpu 1 CPU: 1 PID: 8273 Comm: modprobe Not tainted 5.4.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: <IRQ> __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1fb/0x318 lib/dump_stack.c:118 nmi_cpu_backtrace+0xaf/0x1a0 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x174/0x290 lib/nmi_backtrace.c:62 arch_trigger_cpumask_backtrace+0x10/0x20 arch/x86/kernel/apic/hw_nmi.c:38 trigger_single_cpu_backtrace include/linux/nmi.h:164 [inline] rcu_dump_cpu_stacks+0x15a/0x220 kernel/rcu/tree_stall.h:254 print_cpu_stall kernel/rcu/tree_stall.h:455 [inline] check_cpu_stall kernel/rcu/tree_stall.h:529 [inline] rcu_pending kernel/rcu/tree.c:2827 [inline] rcu_sched_clock_irq+0xe25/0x1ad0 kernel/rcu/tree.c:2271 update_process_times+0x12d/0x180 kernel/time/timer.c:1726 tick_sched_handle kernel/time/tick-sched.c:167 [inline] tick_sched_timer+0x263/0x420 kernel/time/tick-sched.c:1310 __run_hrtimer kernel/time/hrtimer.c:1514 [inline] __hrtimer_run_queues+0x403/0x840 kernel/time/hrtimer.c:1576 hrtimer_interrupt+0x38c/0xda0 kernel/time/hrtimer.c:1638 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1110 [inline] smp_apic_timer_interrupt+0x109/0x280 arch/x86/kernel/apic/apic.c:1135 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:829 </IRQ> RIP: 0010:free_thread_stack+0x16d/0x590 kernel/fork.c:284 Code: c3 08 48 89 d8 48 c1 e8 03 42 80 3c 28 00 74 08 48 89 df e8 25 a4 69 00 48 8b 3b be fc ff ff ff e8 28 04 00 00 43 80 3c 2e 00 <74> 08 4c 89 e7 e8 09 a4 69 00 49 8b 1c 24 48 83 c3 08 48 89 d8 48 RSP: 0018:ffffc900021d77a8 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 RAX: ffffffff81487433 RBX: ffff88809721f808 RCX: ffff88809cdd4480 RDX: 0000000000000000 RSI: 00000000fffffffc RDI: ffffea0002614880 RBP: ffffc900021d77e0 R08: 000000000003a768 R09: ffffed10146ffaa7 R10: ffffed10146ffaa7 R11: 0000000000000000 R12: ffff88809721f8a0 R13: dffffc0000000000 R14: 1ffff11012e43f14 R15: ffff8880a37fd528 release_task_stack kernel/fork.c:440 [inline] put_task_stack+0xa3/0x130 kernel/fork.c:451 finish_task_switch+0x3f1/0x550 kernel/sched/core.c:3256 context_switch kernel/sched/core.c:3388 [inline] __schedule+0x9a8/0xcc0 kernel/sched/core.c:4081 preempt_schedule_irq+0xc1/0x140 kernel/sched/core.c:4338 retint_kernel+0x1b/0x2b RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:752 [inline] RIP: 0010:kmem_cache_free+0xc8/0xf0 mm/slab.c:3695 Code: 58 07 00 74 42 4c 89 f7 57 9d 0f 1f 44 00 00 e8 0e 98 ca ff eb 19 e8 a7 95 ca ff 48 83 3d 07 f7 58 07 00 74 24 4c 89 f7 57 9d <0f> 1f 44 00 00 4c 89 e7 4c 89 fe e8 58 01 00 00 5b 41 5c 41 5e 41 RSP: 0018:ffffc900021d79f0 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff13 RAX: ffff88809cdd4d14 RBX: ffff8880aa9eb540 RCX: ffffffff815c0597 RDX: 0000000000000000 RSI: 0000000000000008 RDI: 0000000000000286 RBP: ffffc900021d7a10 R08: ffff88809cdd4cd8 R09: fffffbfff13c852d R10: fffffbfff13c852d R11: 0000000000000000 R12: ffffffff8147b56c R13: 0000000000000000 R14: 0000000000000286 R15: ffff88808d594b58 vm_area_free+0x1c/0x20 kernel/fork.c:370 remove_vma mm/mmap.c:187 [inline] remove_vma_list mm/mmap.c:2582 [inline] __do_munmap+0x10c5/0x14c0 mm/mmap.c:2826 __vm_munmap mm/mmap.c:2846 [inline] vm_munmap+0xda/0x140 mm/mmap.c:2864 elf_map+0x236/0x310 fs/binfmt_elf.c:375 load_elf_binary+0xfed/0x3670 fs/binfmt_elf.c:983 search_binary_handler+0x1a5/0x660 fs/exec.c:1658 exec_binprm fs/exec.c:1701 [inline] __do_execve_file+0x1573/0x1cd0 fs/exec.c:1821 do_execveat_common fs/exec.c:1867 [inline] do_execve+0x33/0x40 fs/exec.c:1884 call_usermodehelper_exec_async+0x318/0x4c0 kernel/umh.c:112 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352