INFO: rcu detected stall in pipe

Kernel	Title	Rank 🛈	Count	Last	Reported	Patched	Status
linux-5.15	INFO: rcu detected stall in pipe_write	1	1	14d	14d	0/3	upstream: reported on 2026/02/16 17:39
upstream	INFO: rcu detected stall in pipe_write (2) cgroups mm	1	1	2246d	2246d	0/29	closed as invalid on 2020/01/09 08:13
linux-6.1	INFO: rcu detected stall in pipe_write	1	1	625d	625d	0/3	auto-obsoleted due to no activity on 2024/09/24 01:17
upstream	INFO: rcu detected stall in pipe_write (3) mm	1	2	627d	658d	0/29	auto-obsoleted due to no activity on 2024/09/11 11:25

rcu: INFO: rcu_preempt self-detected stall on CPU rcu: 1-...!: (10499 ticks this GP) idle=942/1/0x4000000000000002 softirq=11519/11519 fqs=39 (t=10501 jiffies g=6533 q=163) rcu: rcu_preempt kthread starved for 10424 jiffies! g6533 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=0 rcu: RCU grace-period kthread stack dump: rcu_preempt R running task 29032 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: 8279 Comm: syz-executor.0 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+0x186/0x590 kernel/fork.c:284 Code: 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 c1 e8 03 <42> 80 3c 28 00 74 08 48 89 df e8 eb a3 69 00 48 8b 1b e9 82 ff ff RSP: 0018:ffffc90002097a28 EFLAGS: 00000a06 ORIG_RAX: ffffffffffffff13 RAX: 1ffff1100d81a481 RBX: ffff88806c0d2408 RCX: ffff888096a74140 RDX: 0000000000000000 RSI: 00000000fffffffc RDI: ffffea00024a5540 RBP: ffffc90002097a60 R08: 000000000003a768 R09: ffffed101270970f R10: ffffed101270970f R11: 0000000000000000 R12: ffff88806c0d24a0 R13: dffffc0000000000 R14: 1ffff1100d81a494 R15: ffff88809384b868 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_common kernel/sched/core.c:4236 [inline] preempt_schedule+0xdb/0x120 kernel/sched/core.c:4261 ___preempt_schedule+0x16/0x18 arch/x86/entry/thunk_64.S:50 __raw_spin_unlock_irq include/linux/spinlock_api_smp.h:169 [inline] _raw_spin_unlock_irq+0x77/0x80 kernel/locking/spinlock.c:199 spin_unlock_irq include/linux/spinlock.h:388 [inline] pipe_write+0x507/0x1130 fs/pipe.c:483 call_write_iter include/linux/fs.h:1902 [inline] new_sync_write fs/read_write.c:483 [inline] __vfs_write+0x5a1/0x740 fs/read_write.c:496 vfs_write+0x275/0x590 fs/read_write.c:558 ksys_write+0x117/0x220 fs/read_write.c:611 __do_sys_write fs/read_write.c:623 [inline] __se_sys_write fs/read_write.c:620 [inline] __x64_sys_write+0x7b/0x90 fs/read_write.c:620 do_syscall_64+0xf7/0x1c0 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x414130 Code: b0 89 c8 f7 d8 eb ed b8 6e 00 00 00 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 83 3d 3d 43 66 00 00 75 14 b8 01 00 00 00 0f 05 <48> 3d 01 f0 ff ff 0f 83 c4 1b 00 00 c3 48 83 ec 08 e8 ca fc ff ff RSP: 002b:00007ffd3a099dd8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000414130 RDX: 0000000000000004 RSI: 00007ffd3a099e10 RDI: 00000000000000f8 RBP: 0000000000715460 R08: 0000000000000000 R09: 0000000000000000 R10: 000000524f525245 R11: 0000000000000246 R12: 0000000000714de8 R13: 00007ffd3a099e10 R14: 0000000000000003 R15: 00007ffd3a099e20