INFO: rcu detected stall in dentry_kill

Status: upstream: reported on 2026/02/01 10:07
Reported-by: syzbot+40ef4113d0cb4e05dc9b@syzkaller.appspotmail.com
First crash: 243d, last: 14d
▶ ▼ Similar bugs (3)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream INFO: rcu detected stall in dentry_kill prio:high mm 1 syz, C error 106 14h58m 105d 0/29 upstream: reported C repro on 2026/06/20 03:58
linux-5.15 INFO: rcu detected stall in dentry_kill origin:lts-only 1 syz, C error 10 1d20h 150d 0/3 upstream: reported C repro on 2026/05/06 04:01
linux-6.1 INFO: rcu detected stall in dentry_kill 1 18 22h01m 255d 0/3 upstream: reported on 2026/01/20 19:30

Sample crash report:
rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P7588/1:b..l
rcu: 	(detected by 0, t=10502 jiffies, g=33933, q=10139 ncpus=2)
task:syz-executor    state:R  running task     stack:21800 pid:7588  ppid:1      flags:0x00004006
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5382 [inline]
 __schedule+0x15ae/0x4660 kernel/sched/core.c:6701
 preempt_schedule_irq+0xbf/0x150 kernel/sched/core.c:7011
 irqentry_exit+0x67/0x70 kernel/entry/common.c:441
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:687
RIP: 0010:lockdep_enabled kernel/locking/lockdep.c:116 [inline]
RIP: 0010:lock_is_held_type+0x2c/0x190 kernel/locking/lockdep.c:5820
Code: 1e fa 55 41 57 41 56 41 55 41 54 53 48 83 ec 10 65 48 8b 04 25 28 00 00 00 48 89 44 24 08 bd ff ff ff ff 83 3d a0 18 fb 03 00 <0f> 84 03 01 00 00 65 8b 05 8f 3c 71 75 85 c0 0f 85 f4 00 00 00 65
RSP: 0018:ffffc90003227620 EFLAGS: 00000202
RAX: 13cdf5cdb876a900 RBX: ffffea0001d726c0 RCX: 0000000000000000
RDX: ffff88802b8b8000 RSI: 00000000ffffffff RDI: ffff8880267e32f8
RBP: 00000000ffffffff R08: ffffea0001d726f7 R09: 1ffffd40003ae4de
R10: dffffc0000000000 R11: fffff940003ae4df R12: ffff8880267e32f8
R13: 1ffff92000644ee4 R14: ffffc90003227720 R15: ffff88802239f440
 lock_is_held include/linux/lockdep.h:288 [inline]
 xa_entry include/linux/xarray.h:1217 [inline]
 xas_reload+0xf9/0x470 include/linux/xarray.h:1601
 find_get_entry mm/filemap.c:2030 [inline]
 find_lock_entries+0x3da/0x1020 mm/filemap.c:2114
 shmem_undo_range+0x294/0x1a80 mm/shmem.c:1008
 shmem_truncate_range mm/shmem.c:1135 [inline]
 shmem_evict_inode+0x285/0xa70 mm/shmem.c:1264
 evict+0x4b7/0x8a0 fs/inode.c:705
 __dentry_kill+0x412/0x630 fs/dcache.c:611
 dentry_kill+0xb8/0x290 fs/dcache.c:-1
 dput+0xfe/0x1e0 fs/dcache.c:918
 __fput+0x5b2/0x940 fs/file_table.c:426
 task_work_run+0x1d4/0x260 kernel/task_work.c:245
 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline]
 exit_to_user_mode_loop+0xe6/0x110 kernel/entry/common.c:180
 exit_to_user_mode_prepare+0xee/0x180 kernel/entry/common.c:213
 __syscall_exit_to_user_mode_work kernel/entry/common.c:294 [inline]
 syscall_exit_to_user_mode+0x1a/0x50 kernel/entry/common.c:305
 do_syscall_64+0x61/0xb0 arch/x86/entry/common.c:82
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f55f4b9f397
RSP: 002b:00007ffeb223cad8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 00007f55f4c344bb RCX: 00007f55f4b9f397
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007ffeb223cb90
RBP: 00007ffeb223cb90 R08: 00007ffeb223db90 R09: 00000000ffffffff
R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffeb223dc20
R13: 00007f55f4c344bb R14: 0000000000033be2 R15: 00007ffeb223dc60
 </TASK>

Crashes (21):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/09/18 12:56 linux-6.6.y 79643295eba1 853b104b .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan INFO: rcu detected stall in dentry_kill
2026/09/14 10:19 linux-6.6.y 8b73de7da85f 70a60e12 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan INFO: rcu detected stall in dentry_kill
2026/09/09 21:11 linux-6.6.y 8b73de7da85f 4e8b1cc6 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan INFO: rcu detected stall in dentry_kill
2026/08/28 12:10 linux-6.6.y a4a971135a2f e2fa417d .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan INFO: rcu detected stall in dentry_kill
2026/08/27 20:21 linux-6.6.y 93e0c9521fa8 69a01293 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan INFO: rcu detected stall in dentry_kill
2026/08/27 00:40 linux-6.6.y dc6160265ffc a2b77b9e .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan INFO: rcu detected stall in dentry_kill
2026/07/29 06:04 linux-6.6.y c5596480c50e 19622d9d .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan INFO: rcu detected stall in dentry_kill
2026/07/25 01:28 linux-6.6.y da47cbc25466 dd737a83 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan INFO: rcu detected stall in dentry_kill
2026/06/25 09:12 linux-6.6.y d1cfde2d5d15 cfa969bf .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan INFO: rcu detected stall in dentry_kill
2026/06/24 04:29 linux-6.6.y d1cfde2d5d15 042555ff .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan INFO: rcu detected stall in dentry_kill
2026/06/07 19:47 linux-6.6.y 924b4a879cbb cc095639 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan INFO: rcu detected stall in dentry_kill
2026/06/05 08:59 linux-6.6.y 924b4a879cbb 197909be .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan INFO: rcu detected stall in dentry_kill
2026/06/02 07:41 linux-6.6.y 924b4a879cbb 1095583b .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan INFO: rcu detected stall in dentry_kill
2026/05/13 05:37 linux-6.6.y 3b9f64db0496 a0949470 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan INFO: rcu detected stall in dentry_kill
2026/05/04 17:51 linux-6.6.y 258cf62a6dfd 85f1bcf2 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan INFO: rcu detected stall in dentry_kill
2026/04/15 09:36 linux-6.6.y 8cee53b8eaeb e2e976a8 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan INFO: rcu detected stall in dentry_kill
2026/04/13 05:14 linux-6.6.y 8cee53b8eaeb 38c8e246 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf INFO: rcu detected stall in dentry_kill
2026/04/12 10:28 linux-6.6.y 8cee53b8eaeb 38c8e246 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf INFO: rcu detected stall in dentry_kill
2026/03/26 05:39 linux-6.6.y c09fbcd31ae6 c6143aac .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan INFO: rcu detected stall in dentry_kill
2026/02/09 16:02 linux-6.6.y c56aaf1a85ae df949cd9 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan INFO: rcu detected stall in dentry_kill
2026/02/01 10:07 linux-6.6.y 2cf6f68313dc 6b8752f2 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan INFO: rcu detected stall in dentry_kill
* Struck through repros no longer work on HEAD.