INFO: rcu detected stall in sys_creat (8)

Status: auto-obsoleted due to no activity on 2026/10/23 15:35
Subsystems: selinux
Labels: prio:low
[Documentation on labels]
First crash: 91d, last: 91d
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ID Workflow Result Correct Bug Created Started Finished Revision
e4caddd2 assessment-security DenialOfService: ✅ Exploitable: ❌ FilesystemTrigger: ❌ NetworkTrigger: ❌ PeripheralTrigger: ❌ RemoteTrigger: ❌ Unprivileged: ❌ UserNamespace: ❌ VMGuestTrigger: ❌ VMHostTrigger: ❌ ❓ INFO: rcu detected stall in sys_creat (8) 2026/07/27 02:10 2026/07/27 02:10 2026/07/27 02:15 492bab15
▶ ▼ Similar bugs (10)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream INFO: rcu detected stall in sys_creat exfat 1 98 2834d 2925d 0/29 closed as dup on 2019/01/20 01:52
upstream INFO: rcu detected stall in sys_creat (7) fs 1 1 534d 534d 0/29 auto-obsoleted due to no activity on 2025/08/06 22:34
upstream INFO: rcu detected stall in sys_creat (6) cgroups mm 1 1 628d 628d 0/29 auto-obsoleted due to no activity on 2025/05/04 14:13
upstream INFO: rcu detected stall in sys_creat (5) cgroups mm fs 1 2 854d 900d 0/29 auto-obsoleted due to no activity on 2024/08/22 00:53
upstream INFO: rcu detected stall in sys_creat (4) mm cgroups 1 1 1847d 1847d 0/29 auto-closed as invalid on 2021/12/03 06:38
upstream INFO: rcu detected stall in sys_creat (2) mm 1 1 2518d 2518d 0/29 closed as invalid on 2019/12/04 14:04
upstream INFO: rcu detected stall in sys_creat (3) fs 1 1 2289d 2289d 0/29 auto-closed as invalid on 2020/10/17 06:02
linux-6.1 INFO: rcu detected stall in sys_creat 1 1 1159d 1159d 0/3 auto-obsoleted due to no activity on 2023/11/30 18:44
linux-5.15 INFO: rcu detected stall in sys_creat 1 1 762d 762d 0/3 auto-obsoleted due to no activity on 2024/12/31 15:05
android-5-15 BUG: soft lockup in sys_creat 1 4 881d 911d 0/2 auto-obsoleted due to no activity on 2024/08/25 01:26

Sample crash report:
rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P24535/1:b..l
rcu: 	(detected by 1, t=10505 jiffies, g=166629, q=286 ncpus=2)
task:syz.5.4203      state:R  running task     stack:27048 pid:24535 tgid:24530 ppid:22082  task_flags:0x400140 flags:0x00080000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5510 [inline]
 __schedule+0x125c/0x6730 kernel/sched/core.c:7234
 preempt_schedule_irq+0x50/0x90 kernel/sched/core.c:7556
 irqentry_exit_to_kernel_mode_preempt include/linux/irq-entry-common.h:468 [inline]
 irqentry_exit_to_kernel_mode include/linux/irq-entry-common.h:539 [inline]
 irqentry_exit+0x205/0xa00 kernel/entry/common.c:167
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:674
RIP: 0010:avtab_search_node+0x0/0x490 security/selinux/ss/avtab.c:146
Code: e8 05 26 a3 fd 8b 04 24 e9 b5 fc ff ff e8 98 25 a3 fd e9 00 ff ff ff 0f 1f 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 <0f> 1f 40 d6 41 57 41 56 41 55 41 54 55 48 89 f5 53 48 89 fb 48 83
RSP: 0018:ffffc900056372d0 EFLAGS: 00000283
RAX: 000000000000c631 RBX: ffff8880353b8988 RCX: ffffc90010789000
RDX: 0000000000080000 RSI: ffffc90005637420 RDI: ffff8880353b8988
RBP: ffff88802a078de0 R08: 0000000000000002 R09: 00000000000004d5
R10: 00000000000000bf R11: 0000000000000000 R12: ffffc900056376e0
R13: 0000000000000600 R14: ffffc900056376e0 R15: ffffc90005637420
 cond_compute_av+0x5f/0x350 security/selinux/ss/conditional.c:591
 context_struct_compute_av+0x81f/0x1250 security/selinux/ss/services.c:677
 security_compute_av+0x5ea/0x11e0 security/selinux/ss/services.c:1178
 avc_compute_av+0x84/0x820 security/selinux/avc.c:992
 avc_perm_nonode+0xb1/0x180 security/selinux/avc.c:1117
 avc_has_perm_noaudit+0x2d4/0x3b0 security/selinux/avc.c:1160
 cred_has_capability.isra.0+0x171/0x300 security/selinux/hooks.c:1666
 security_capable+0x10d/0x260 security/security.c:660
 ns_capable_common kernel/capability.c:342 [inline]
 ns_capable kernel/capability.c:363 [inline]
 capable_wrt_inode_uidgid+0xca/0x170 kernel/capability.c:478
 generic_permission fs/namei.c:536 [inline]
 generic_permission+0x496/0x800 fs/namei.c:521
 do_inode_permission fs/namei.c:590 [inline]
 inode_permission+0x2df/0x620 fs/namei.c:653
 lookup_one_common fs/namei.c:3121 [inline]
 lookup_one_common fs/namei.c:3114 [inline]
 start_creating+0x84/0x120 fs/namei.c:3402
 ovl_start_creating_upper fs/overlayfs/overlayfs.h:428 [inline]
 ovl_create_upper+0x1f3/0x610 fs/overlayfs/dir.c:371
 ovl_create_handle_whiteouts fs/overlayfs/dir.c:644 [inline]
 ovl_create_or_link+0x321/0x390 fs/overlayfs/dir.c:686
 ovl_create_object+0x2bf/0x3b0 fs/overlayfs/dir.c:723
 lookup_open fs/namei.c:4508 [inline]
 open_last_lookups fs/namei.c:4608 [inline]
 path_openat+0x341f/0x4280 fs/namei.c:4860
 do_file_open+0x20e/0x430 fs/namei.c:4892
 do_sys_openat2+0x10f/0x1e0 fs/open.c:1368
 do_sys_open fs/open.c:1374 [inline]
 __do_sys_creat fs/open.c:1452 [inline]
 __se_sys_creat fs/open.c:1446 [inline]
 __x64_sys_creat+0xcc/0x120 fs/open.c:1446
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x115/0x870 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f932299de99
RSP: 002b:00007f932391c028 EFLAGS: 00000246 ORIG_RAX: 0000000000000055
RAX: ffffffffffffffda RBX: 00007f9322c26090 RCX: 00007f932299de99
RDX: 0000000000000000 RSI: 0000000000000062 RDI: 0000200000000000
RBP: 00007f9322a33eaf R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f9322c26128 R14: 00007f9322c26090 R15: 00007ffcf53cd5e8
 </TASK>
rcu: rcu_preempt kthread timer wakeup didn't happen for 10500 jiffies! g166629 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: 	Possible timer handling issue on cpu=0 timer-softirq=110479
rcu: rcu_preempt kthread starved for 10501 jiffies! g166629 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->cpu=0
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:I stack:27432 pid:16    tgid:16    ppid:2      task_flags:0x208040 flags:0x00080000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5510 [inline]
 __schedule+0x125c/0x6730 kernel/sched/core.c:7234
 __schedule_loop kernel/sched/core.c:7311 [inline]
 schedule+0xdd/0x2c0 kernel/sched/core.c:7326
 schedule_timeout+0x127/0x280 kernel/time/sleep_timeout.c:99
 rcu_gp_fqs_loop+0x1a9/0x900 kernel/rcu/tree.c:2123
 rcu_gp_kthread+0x179/0x230 kernel/rcu/tree.c:2325
 kthread+0x370/0x450 kernel/kthread.c:436
 ret_from_fork+0x72b/0xd50 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>
rcu: Stack dump where RCU GP kthread last ran:
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 24533 Comm: syz.0.4204 Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/16/2026
RIP: 0010:__lock_acquire+0x4be/0x1a40 kernel/locking/lockdep.c:5207
Code: 48 89 de 48 89 ef e8 f1 ee ff ff 85 c0 0f 84 e9 fe ff ff 44 8b 1d a2 b9 8d 19 45 85 db 75 11 4d 63 e4 4c 0f a3 25 72 0d 85 14 <0f> 83 69 0b 00 00 48 8b b5 90 0b 00 00 45 85 ed 0f 84 93 01 00 00
RSP: 0018:ffffc90000007c58 EFLAGS: 00000047
RAX: 0000000000000001 RBX: ffff88804e300bc8 RCX: 0000000000000100
RDX: 0000000000000000 RSI: ffff88804e300bc8 RDI: ffff88804e300000
RBP: ffff88804e300000 R08: 0000000000000001 R09: 0000000000000002
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000001 R14: 0000000000000000 R15: 0000000000000001
FS:  00007f218e54e6c0(0000) GS:ffff888123dde000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b30c22ff8 CR3: 0000000055e5a000 CR4: 00000000003526f0
Call Trace:
 <IRQ>
 lock_acquire kernel/locking/lockdep.c:5868 [inline]
 lock_acquire+0x1b9/0x370 kernel/locking/lockdep.c:5825
 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:132 [inline]
 _raw_spin_lock_irqsave+0x3a/0x60 kernel/locking/spinlock.c:166
 debug_object_deactivate+0x135/0x3b0 lib/debugobjects.c:936
 debug_hrtimer_deactivate kernel/time/hrtimer.c:490 [inline]
 __run_hrtimer kernel/time/hrtimer.c:2000 [inline]
 __hrtimer_run_queues+0x2e9/0x9c0 kernel/time/hrtimer.c:2096
 hrtimer_interrupt+0x3e5/0x940 kernel/time/hrtimer.c:2215
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1051 [inline]
 __sysvec_apic_timer_interrupt+0x109/0x470 arch/x86/kernel/apic/apic.c:1068
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1062 [inline]
 sysvec_apic_timer_interrupt+0x9e/0xc0 arch/x86/kernel/apic/apic.c:1062
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:674
RIP: 0010:in_irqentry_text kernel/stacktrace.c:380 [inline]
RIP: 0010:filter_irq_stacks+0x48/0x90 kernel/stacktrace.c:397
Code: ea 03 80 3c 1a 00 75 4a 48 8b 17 48 81 fa 30 02 00 81 72 16 48 81 fa 90 16 00 81 73 0d 83 c0 01 48 83 c4 10 5b c3 cc cc cc cc <48> 81 fa 00 15 be 8b 72 09 48 81 fa 1b 15 be 8b 72 e1 83 c0 01 48
RSP: 0018:ffffc90005667400 EFLAGS: 00000206
RAX: 0000000000000007 RBX: dffffc0000000000 RCX: 0000000000000001
RDX: ffffffff84dc1762 RSI: 0000000000000012 RDI: ffffc900056674b0
RBP: 0000000000082820 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000000 R12: ffffc90005667478
R13: 0000000000000800 R14: ffff88807f351000 R15: 0000000000000800
 stack_depot_save_flags+0x27/0x9d0 lib/stackdepot.c:667
 kasan_save_stack+0x3f/0x50 mm/kasan/common.c:58
 kasan_save_track+0x14/0x30 mm/kasan/common.c:78
 poison_kmalloc_redzone mm/kasan/common.c:398 [inline]
 __kasan_kmalloc+0xaa/0xb0 mm/kasan/common.c:415
 kasan_kmalloc include/linux/kasan.h:263 [inline]
 __do_kmalloc_node mm/slub.c:5334 [inline]
 __kmalloc_node_track_caller_noprof+0x331/0x830 mm/slub.c:5471
 kmalloc_reserve+0xe8/0x350 net/core/skbuff.c:637
 __alloc_skb+0x185/0x710 net/core/skbuff.c:715
 alloc_skb include/linux/skbuff.h:1384 [inline]
 nlmsg_new include/net/netlink.h:1055 [inline]
 audit_buffer_alloc kernel/audit.c:1846 [inline]
 audit_log_start+0x350/0x930 kernel/audit.c:1965
 common_lsm_audit+0xb2/0x2b0 security/lsm_audit.c:442
 slow_avc_audit+0x186/0x210 security/selinux/avc.c:779
 avc_audit security/selinux/include/avc.h:131 [inline]
 avc_has_perm+0x1a6/0x1e0 security/selinux/avc.c:1198
 __file_map_prot_check+0x368/0x830 security/selinux/hooks.c:3996
 file_map_prot_check security/selinux/hooks.c:4022 [inline]
 selinux_mmap_file_common security/selinux/hooks.c:4054 [inline]
 selinux_mmap_file+0x14d/0x1c0 security/selinux/hooks.c:4061
 security_mmap_file+0xc3/0x9b0 security/security.c:2581
 vm_mmap_pgoff+0xec/0x470 mm/util.c:575
 ksys_mmap_pgoff+0xe4/0x610 mm/mmap.c:606
 __do_sys_mmap arch/x86/kernel/sys_x86_64.c:89 [inline]
 __se_sys_mmap arch/x86/kernel/sys_x86_64.c:82 [inline]
 __x64_sys_mmap+0x125/0x190 arch/x86/kernel/sys_x86_64.c:82
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x115/0x870 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f218d59de99
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f218e54e028 EFLAGS: 00000246 ORIG_RAX: 0000000000000009
RAX: ffffffffffffffda RBX: 00007f218d825fa0 RCX: 00007f218d59de99
RDX: b635773f06ebbeee RSI: 0000000000b36000 RDI: 0000200000000000
RBP: 00007f218d633eaf R08: ffffffffffffffff R09: 0000000000000000
R10: 0000000000008031 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f218d826038 R14: 00007f218d825fa0 R15: 00007fffcbfdaff8
 </TASK>

Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/07/25 15:28 upstream 0ce37745d4bf 492bab15 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root INFO: rcu detected stall in sys_creat
* Struck through repros no longer work on HEAD.