INFO: rcu detected stall in sys

Kernel	Title	Rank 🛈	Repro	Cause bisect	Fix bisect	Count	Last	Reported	Patched	Status
upstream	INFO: rcu detected stall in sys_symlink (6) mm prio:high	1	C	error	inconclusive	6	6d20h	200d	0/29	upstream: reported C repro on 2025/10/27 21:18
linux-6.1	INFO: rcu detected stall in sys_symlink origin:lts-only	1	C		error	2	97d	111d	0/3	upstream: reported C repro on 2026/01/24 22:49
linux-5.15	INFO: rcu detected stall in sys_symlink	1				1	146d	146d	0/3	auto-obsoleted due to no activity on 2026/03/31 12:04
upstream	INFO: rcu detected stall in sys_symlink (3) mm	1				4	2320d	2320d	0/29	closed as invalid on 2020/01/09 08:13
upstream	INFO: rcu detected stall in sys_symlink (2) cgroups mm	1				2	2320d	2320d	0/29	closed as invalid on 2020/01/08 05:23
linux-6.6	INFO: rcu detected stall in sys_symlink	1				1	321d	321d	0/2	auto-obsoleted due to no activity on 2025/10/07 08:06
upstream	INFO: rcu detected stall in sys_symlink mm	1				17	2355d	2356d	0/29	closed as invalid on 2019/12/04 14:14
upstream	INFO: rcu detected stall in sys_symlink (4) bpf	1				11	1583d	1687d	0/29	closed as invalid on 2022/02/08 09:50
upstream	INFO: rcu detected stall in sys_symlink (5) mm fs	1	syz	inconclusive	done	6	532d	582d	0/29	closed as invalid on 2025/02/03 10:48

rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P4299/1:b..l P4182/1:b..l (detected by 0, t=10502 jiffies, g=8537, q=158) task:udevd state:R running task stack:25552 pid: 4182 ppid: 3560 flags:0x00004002 Call Trace: <TASK> context_switch kernel/sched/core.c:5049 [inline] __schedule+0x11ef/0x43c0 kernel/sched/core.c:6395 preempt_schedule_irq+0xbb/0x160 kernel/sched/core.c:6799 irqentry_exit+0x63/0x70 kernel/entry/common.c:432 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:676 RIP: 0010:lock_acquire+0x4b/0x400 kernel/locking/lockdep.c:5591 Code: 30 48 89 4c 24 28 89 d3 89 74 24 1c 49 89 fc 65 48 8b 04 25 28 00 00 00 48 89 84 24 c0 00 00 00 49 bf 00 00 00 00 00 fc ff df <48> c7 44 24 60 b3 8a b5 41 48 c7 44 24 68 ff 46 bc 8b 48 c7 44 24 RSP: 0018:ffffc90002e6f980 EFLAGS: 00000282 RAX: 4fde07bc09458b00 RBX: 0000000000000000 RCX: 0000000000000002 RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff8c31eb20 RBP: ffffc90002e6fa98 R08: 0000000000000000 R09: 0000000000000000 R10: dffffc0000000000 R11: fffff520005cdf7e R12: ffffffff8c31eb20 R13: 0000000000000040 R14: ffffc90002e6fbe0 R15: dffffc0000000000 rcu_lock_acquire+0x2a/0x30 include/linux/rcupdate.h:313 rcu_read_lock include/linux/rcupdate.h:740 [inline] path_init+0x104/0x1160 fs/namei.c:2344 path_parentat fs/namei.c:2509 [inline] __filename_parentat+0x247/0x690 fs/namei.c:2534 filename_parentat fs/namei.c:2552 [inline] filename_create+0xd5/0x470 fs/namei.c:3824 do_symlinkat+0xbc/0x6b0 fs/namei.c:4456 __do_sys_symlink fs/namei.c:4488 [inline] __se_sys_symlink fs/namei.c:4486 [inline] __x64_sys_symlink+0x7a/0x90 fs/namei.c:4486 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 RIP: 0033:0x7fe11a511527 RSP: 002b:00007ffdbe86a528 EFLAGS: 00000202 ORIG_RAX: 0000000000000058 RAX: ffffffffffffffda RBX: 00005646eb850320 RCX: 00007fe11a511527 RDX: fffffffffffffe68 RSI: 00007ffdbe86a530 RDI: 00005646eb845e80 RBP: 00000000000000c5 R08: 0000000000000064 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000202 R12: 00007ffdbe86a530 R13: 00005646eb84e410 R14: 0000000000000008 R15: 00005646eb850320 </TASK> task:kworker/u4:9 state:R running task stack:26128 pid: 4299 ppid: 2 flags:0x00004000 Workqueue: bat_events batadv_nc_worker Call Trace: <TASK> context_switch kernel/sched/core.c:5049 [inline] __schedule+0x11ef/0x43c0 kernel/sched/core.c:6395 preempt_schedule_irq+0xbb/0x160 kernel/sched/core.c:6799 irqentry_exit+0x63/0x70 kernel/entry/common.c:432 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:676 RIP: 0010:preempt_count arch/x86/include/asm/preempt.h:27 [inline] RIP: 0010:check_kcov_mode kernel/kcov.c:172 [inline] RIP: 0010:write_comp_data kernel/kcov.c:227 [inline] RIP: 0010:__sanitizer_cov_trace_const_cmp4+0xc/0x80 kernel/kcov.c:293 Code: 44 02 08 03 00 00 00 4a 89 7c 02 10 4a 89 74 02 18 4a 89 44 02 20 48 ff c1 48 89 0a c3 90 48 8b 04 24 65 48 8b 0d c4 37 89 7e <65> 8b 15 c5 37 89 7e 81 e2 00 01 ff 00 74 11 81 fa 00 01 00 00 75 RSP: 0018:ffffc9000363fbd8 EFLAGS: 00000246 RAX: ffffffff89915113 RBX: dffffc0000000000 RCX: ffff88802ab13b80 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000 RBP: 0000000000000001 R08: dffffc0000000000 R09: 1ffffffff203aa18 R10: dffffc0000000000 R11: fffffbfff203aa19 R12: 000000000000020e R13: fffffffffffffe38 R14: ffff888029630c80 R15: ffff88805f3484d0 rcu_read_unlock include/linux/rcupdate.h:769 [inline] batadv_nc_purge_orig_hash net/batman-adv/network-coding.c:416 [inline] batadv_nc_worker+0x1d3/0x5c0 net/batman-adv/network-coding.c:723 process_one_work+0x85f/0x1010 kernel/workqueue.c:2310 worker_thread+0xaa6/0x1290 kernel/workqueue.c:2457 kthread+0x436/0x520 kernel/kthread.c:334 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287 </TASK> rcu: rcu_preempt kthread starved for 10553 jiffies! g8537 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:27536 pid: 15 ppid: 2 flags:0x00004000 Call Trace: <TASK> context_switch kernel/sched/core.c:5049 [inline] __schedule+0x11ef/0x43c0 kernel/sched/core.c:6395 schedule+0x11b/0x1e0 kernel/sched/core.c:6478 schedule_timeout+0x184/0x2d0 kernel/time/timer.c:2117 rcu_gp_fqs_loop+0x2be/0x11d0 kernel/rcu/tree.c:1972 rcu_gp_kthread+0x9b/0x370 kernel/rcu/tree.c:2145 kthread+0x436/0x520 kernel/kthread.c:334 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287 </TASK> rcu: Stack dump where RCU GP kthread last ran: Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 4572 Comm: syz.0.73 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026 RIP: 0010:bytes_is_nonzero mm/kasan/generic.c:87 [inline] RIP: 0010:memory_is_nonzero mm/kasan/generic.c:102 [inline] RIP: 0010:memory_is_poisoned_n mm/kasan/generic.c:128 [inline] RIP: 0010:memory_is_poisoned mm/kasan/generic.c:159 [inline] RIP: 0010:check_region_inline mm/kasan/generic.c:180 [inline] RIP: 0010:kasan_check_range+0x8a/0x290 mm/kasan/generic.c:189 Code: 1c 21 49 89 df 4d 29 df 49 83 ff 10 7f 29 4d 85 ff 0f 84 38 01 00 00 4c 89 cb 48 f7 d3 4c 01 f3 41 80 3b 00 0f 85 86 01 00 00 <49> ff c3 48 ff c3 75 ee e9 18 01 00 00 44 89 dd 83 e5 07 0f 84 b5 RSP: 0018:ffffc9000369f770 EFLAGS: 00000046 RAX: 0000000000000001 RBX: ffffffffffffffff RCX: ffffffff815d23b3 RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffffffff901d50d0 RBP: ffffc9000369f9f0 R08: ffffffff901d50d7 R09: 1ffffffff203aa1a R10: dffffc0000000000 R11: fffffbfff203aa1a R12: dffffc0000000001 R13: ffff888022578000 R14: 1ffffffff203aa1a R15: 0000000000000001 FS: 000055557a67e500(0000) GS:ffff8880b9100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f35c85f1ff8 CR3: 000000007d130000 CR4: 00000000003506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600 Call Trace: <TASK> instrument_atomic_read include/linux/instrumented.h:71 [inline] test_bit include/asm-generic/bitops/instrumented-non-atomic.h:134 [inline] __lock_acquire+0xdc3/0x7d10 kernel/locking/lockdep.c:4982 lock_acquire+0x19e/0x400 kernel/locking/lockdep.c:5623 __raw_spin_lock_irq include/linux/spinlock_api_smp.h:128 [inline] _raw_spin_lock_irq+0xab/0xf0 kernel/locking/spinlock.c:170 spin_lock_irq include/linux/spinlock.h:389 [inline] get_signal+0x255/0x12c0 kernel/signal.c:2697 arch_do_signal_or_restart+0xe7/0x12c0 arch/x86/kernel/signal.c:867 handle_signal_work kernel/entry/common.c:154 [inline] exit_to_user_mode_loop+0x9e/0x130 kernel/entry/common.c:178 exit_to_user_mode_prepare+0xee/0x180 kernel/entry/common.c:214 __syscall_exit_to_user_mode_work kernel/entry/common.c:296 [inline] syscall_exit_to_user_mode+0x16/0x40 kernel/entry/common.c:307 do_syscall_64+0x58/0xa0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x66/0xd0 RIP: 0033:0x7f35ca28e6e9 Code: 90 49 8b 4f 40 c6 04 01 00 48 83 c0 01 48 39 f0 72 ef e9 89 fe ff ff 66 2e 0f 1f 84 00 00 00 00 00 48 8b 0d 91 09 3a 00 31 c0 <48> 81 ce ff ff ff 3f 48 3b 34 c1 74 14 48 83 c0 01 48 83 f8 04 0f RSP: 002b:00007ffc95293c50 EFLAGS: 00000246 RAX: 0000000000000000 RBX: ffffffff81a2fbf8 RCX: 000000110c230000 RDX: 0000000000001bf8 RSI: ffffffff81a2fbf8 RDI: 0000000000000008 RBP: 0000000000000000 R08: 00007f35ca61d000 R09: 00007f35ca61f000 R10: 0000000081a2fbfc R11: 0000000000000008 R12: 00007f35ca633128 R13: 0000000000000617 R14: ffffffff81a2fe73 R15: 00007f35cb162720 </TASK> sched: RT throttling activated

Crashes (1):
Time	Kernel	Commit	Syzkaller	Config	Log	Report	Syz repro	C repro	VM info	Assets (help?)	Manager	Title
2026/05/15 06:02	linux-5.15.y	de8dfb3f0278	6ccb967e	.config	console log	report			info	[disk image] [vmlinux] [kernel image]	ci2-linux-5-15-kasan	INFO: rcu detected stall in sys_symlink

Crashes (1):

Assets (help?)