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	1	C	error	inconclusive	5	19d	95d	0/29	upstream: reported C repro on 2025/10/27 21:18
linux-5.15	INFO: rcu detected stall in sys_symlink	1				1	41d	41d	0/3	upstream: reported on 2025/12/21 12:04
upstream	INFO: rcu detected stall in sys_symlink (3) mm	1				4	2215d	2215d	0/29	closed as invalid on 2020/01/09 08:13
upstream	INFO: rcu detected stall in sys_symlink (2) cgroups mm	1				2	2215d	2215d	0/29	closed as invalid on 2020/01/08 05:23
linux-6.6	INFO: rcu detected stall in sys_symlink	1				1	216d	216d	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	2250d	2251d	0/29	closed as invalid on 2019/12/04 14:14
upstream	INFO: rcu detected stall in sys_symlink (4) bpf	1				11	1478d	1582d	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	427d	477d	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): P33/1:b..l P14563/1:b..l (detected by 0, t=10502 jiffies, g=116493, q=141 ncpus=2) task:udevd state:R running task stack:24848 pid:14563 ppid:3637 flags:0x00004002 Call Trace: <TASK> context_switch kernel/sched/core.c:5245 [inline] __schedule+0x11d1/0x40e0 kernel/sched/core.c:6562 preempt_schedule_irq+0xbb/0x160 kernel/sched/core.c:6874 irqentry_exit+0x63/0x70 kernel/entry/common.c:439 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:691 RIP: 0010:unwind_get_return_address+0x49/0x80 arch/x86/kernel/unwind_orc.c:323 Code: c0 75 47 83 3b 00 74 3a 48 83 c3 48 49 89 df 49 c1 ef 03 43 80 3c 37 00 74 08 48 89 df e8 5f 45 9a 00 48 8b 3b e8 77 27 1d 00 <85> c0 74 14 43 80 3c 37 00 74 08 48 89 df e8 44 45 9a 00 48 8b 03 RSP: 0018:ffffc90004c5f4e8 EFLAGS: 00000202 RAX: 0000000000000001 RBX: ffffc90004c5f550 RCX: 0000000080000000 RDX: ffffc90004c5f501 RSI: dffffc0000000000 RDI: ffffffff81c7cc1e RBP: ffffc90004c5f590 R08: ffffc90004c5f820 R09: ffffc90004c5f558 R10: dffffc0000000000 R11: fffff5200098bead R12: ffff888018b80000 R13: 1ffff110031700ae R14: dffffc0000000000 R15: 1ffff9200098beaa arch_stack_walk+0xf2/0x140 arch/x86/kernel/stacktrace.c:26 stack_trace_save+0xa6/0xf0 kernel/stacktrace.c:122 save_stack+0x121/0x230 mm/page_owner.c:127 __reset_page_owner+0x51/0x1a0 mm/page_owner.c:148 reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1459 [inline] free_pcp_prepare mm/page_alloc.c:1509 [inline] free_unref_page_prepare+0x8b4/0x9a0 mm/page_alloc.c:3384 free_unref_page+0x2e/0x3f0 mm/page_alloc.c:3479 free_slab mm/slub.c:2036 [inline] discard_slab mm/slub.c:2042 [inline] __unfreeze_partials+0x1a5/0x200 mm/slub.c:2591 put_cpu_partial+0x17c/0x250 mm/slub.c:2667 qlink_free mm/kasan/quarantine.c:168 [inline] qlist_free_all+0x76/0xe0 mm/kasan/quarantine.c:187 kasan_quarantine_reduce+0x144/0x160 mm/kasan/quarantine.c:294 __kasan_slab_alloc+0x1e/0x80 mm/kasan/common.c:306 kasan_slab_alloc include/linux/kasan.h:201 [inline] slab_post_alloc_hook+0x4b/0x480 mm/slab.h:737 slab_alloc_node mm/slub.c:3359 [inline] __kmem_cache_alloc_node+0x140/0x260 mm/slub.c:3398 __do_kmalloc_node mm/slab_common.c:935 [inline] __kmalloc+0xa0/0x240 mm/slab_common.c:949 kmalloc include/linux/slab.h:568 [inline] kzalloc include/linux/slab.h:699 [inline] tomoyo_encode2 security/tomoyo/realpath.c:45 [inline] tomoyo_encode+0x27e/0x540 security/tomoyo/realpath.c:80 tomoyo_path_perm+0x382/0x610 security/tomoyo/file.c:831 tomoyo_path_symlink+0xa8/0xf0 security/tomoyo/tomoyo.c:199 security_path_symlink+0xdc/0x130 security/security.c:1198 do_symlinkat+0x10c/0x400 fs/namei.c:4503 __do_sys_symlink fs/namei.c:4530 [inline] __se_sys_symlink fs/namei.c:4528 [inline] __x64_sys_symlink+0x7a/0x90 fs/namei.c:4528 do_syscall_x64 arch/x86/entry/common.c:46 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7f53e0115527 RSP: 002b:00007ffc03aba0d8 EFLAGS: 00000206 ORIG_RAX: 0000000000000058 RAX: ffffffffffffffda RBX: 0000564c63fbee00 RCX: 00007f53e0115527 RDX: fffffffffffffe68 RSI: 00007ffc03aba0e0 RDI: 0000564c63fb7d00 RBP: 0000000000000b3c R08: 0000000000000064 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000206 R12: 00007ffc03aba0e0 R13: 0000564c63fbe410 R14: 0000000000000008 R15: 0000564c63fbee00 </TASK> task:kworker/u4:2 state:R running task stack:21744 pid:33 ppid:2 flags:0x00004000 Workqueue: bat_events batadv_nc_worker Call Trace: <TASK> context_switch kernel/sched/core.c:5245 [inline] __schedule+0x11d1/0x40e0 kernel/sched/core.c:6562 preempt_schedule_irq+0xbb/0x160 kernel/sched/core.c:6874 irqentry_exit+0x63/0x70 kernel/entry/common.c:439 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:691 RIP: 0010:lock_acquire+0x225/0x4a0 kernel/locking/lockdep.c:5666 Code: f7 84 24 80 00 00 00 00 02 00 00 43 c6 44 3d 04 f8 0f 85 f0 00 00 00 41 f7 c6 00 02 00 00 74 01 fb 48 c7 44 24 60 0e 36 e0 45 <4b> c7 44 3d 00 00 00 00 00 43 c7 44 3d 08 00 00 00 00 65 48 8b 04 RSP: 0018:ffffc90000aa7ac0 EFLAGS: 00000206 RAX: 0000000000000001 RBX: 0000000000000000 RCX: 5bdce5505b491a00 RDX: 0000000000000000 RSI: ffffffff8a8c23a0 RDI: ffffffff8adf0c20 RBP: ffffc90000aa7bc8 R08: dffffc0000000000 R09: 1ffffffff215e648 R10: dffffc0000000000 R11: fffffbfff215e649 R12: 0000000000000000 R13: 1ffff92000154f64 R14: 0000000000000246 R15: dffffc0000000000 rcu_lock_acquire include/linux/rcupdate.h:350 [inline] rcu_read_lock include/linux/rcupdate.h:791 [inline] batadv_nc_purge_orig_hash net/batman-adv/network-coding.c:408 [inline] batadv_nc_worker+0xeb/0x600 net/batman-adv/network-coding.c:719 process_one_work+0x8a2/0x1160 kernel/workqueue.c:2292 worker_thread+0xaa2/0x1270 kernel/workqueue.c:2439 kthread+0x29d/0x330 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 </TASK> rcu: rcu_preempt kthread starved for 10470 jiffies! g116493 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:26864 pid:16 ppid:2 flags:0x00004000 Call Trace: <TASK> context_switch kernel/sched/core.c:5245 [inline] __schedule+0x11d1/0x40e0 kernel/sched/core.c:6562 schedule+0xb9/0x180 kernel/sched/core.c:6638 schedule_timeout+0x184/0x2d0 kernel/time/timer.c:2168 rcu_gp_fqs_loop+0x303/0x1340 kernel/rcu/tree.c:1706 rcu_gp_kthread+0x99/0x3b0 kernel/rcu/tree.c:1905 kthread+0x29d/0x330 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 </TASK> rcu: Stack dump where RCU GP kthread last ran: Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 skipped: idling at native_safe_halt arch/x86/include/asm/irqflags.h:51 [inline] NMI backtrace for cpu 1 skipped: idling at arch_safe_halt arch/x86/include/asm/irqflags.h:89 [inline] NMI backtrace for cpu 1 skipped: idling at default_idle+0xb/0x10 arch/x86/kernel/process.c:741

Crashes (1):
Time	Kernel	Commit	Syzkaller	Config	Log	Report	Syz repro	C repro	VM info	Assets (help?)	Manager	Title
2026/01/24 22:48	linux-6.1.y	cd9b81672742	40acda8a	.config	console log	report			info	[disk image] [vmlinux] [kernel image]	ci2-linux-6-1-kasan	INFO: rcu detected stall in sys_symlink

Crashes (1):

Assets (help?)