rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P14400/1:b..l P5619/1:b..l
rcu: (detected by 1, t=10502 jiffies, g=103037, q=108 ncpus=2)
task:syz-executor state:R running task stack:23928 pid:5619 tgid:5619 ppid:5614 task_flags:0x400140 flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5388 [inline]
__schedule+0x1295/0x67a0 kernel/sched/core.c:7189
preempt_schedule_irq+0x50/0x90 kernel/sched/core.c:7513
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+0x205/0x970 kernel/entry/common.c:164
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:__update_page_owner_free_handle.isra.0+0x15d/0x4d0 mm/page_owner.c:284
Code: d9 79 9b 18 48 83 c5 01 e8 50 b7 87 ff 48 85 db 0f 84 ca 01 00 00 e8 42 b7 87 ff 0f b7 74 24 0e bf 1f 00 00 00 e8 b3 b1 87 ff 2e b7 87 ff 4c 8b 34 24 48 89 ef 4c 89 f6 e8 3f b1 87 ff 4c 39
RSP: 0018:ffffc90003937560 EFLAGS: 00000293
RAX: 0000000000000000 RBX: ffff88801dc43f30 RCX: ffffffff8280d9ed
RDX: 0000000000000000 RSI: 000000000000001f RDI: ffff888078664a80
RBP: 0000000000000001 R08: 0000000000000003 R09: 000000000000001f
R10: 0000000000000000 R11: 0000000000000000 R12: ffff888078664a80
R13: 00000000023801dc R14: 0000000000000d97 R15: 0000000000048d97
__reset_page_owner+0x93/0x190 mm/page_owner.c:321
reset_page_owner include/linux/page_owner.h:25 [inline]
__free_pages_prepare mm/page_alloc.c:1397 [inline]
free_unref_folios+0xa44/0x1730 mm/page_alloc.c:2999
folios_put_refs+0x571/0xa90 mm/swap.c:1008
folio_batch_release include/linux/folio_batch.h:101 [inline]
shmem_undo_range+0x5e5/0x1570 mm/shmem.c:1149
shmem_truncate_range mm/shmem.c:1277 [inline]
shmem_evict_inode+0x3f3/0xc40 mm/shmem.c:1407
evict+0x3c2/0xad0 fs/inode.c:841
iput_final fs/inode.c:1960 [inline]
iput.part.0+0x605/0xf50 fs/inode.c:2009
iput+0x35/0x40 fs/inode.c:1975
filename_unlinkat+0x466/0x730 fs/namei.c:5572
__do_sys_unlink fs/namei.c:5603 [inline]
__se_sys_unlink fs/namei.c:5600 [inline]
__x64_sys_unlink+0x46/0x70 fs/namei.c:5600
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: 0033:0x7fe50319bf47
RSP: 002b:00007fffd40863b8 EFLAGS: 00000206 ORIG_RAX: 0000000000000057
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fe50319bf47
RDX: 00007fffd40863e0 RSI: 00007fffd4086470 RDI: 00007fffd4086470
RBP: 00007fffd4086470 R08: 00007fffd4087470 R09: 00000000ffffffff
R10: 0000000000000100 R11: 0000000000000206 R12: 00007fffd4087500
R13: 00007fe5032321ca R14: 00000000000d5c98 R15: 00007fffd4087540
task:udevd state:R running task stack:26168 pid:14400 tgid:14400 ppid:4989 task_flags:0x400140 flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5388 [inline]
__schedule+0x1295/0x67a0 kernel/sched/core.c:7189
preempt_schedule_irq+0x50/0x90 kernel/sched/core.c:7513
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+0x205/0x970 kernel/entry/common.c:164
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:its_return_thunk+0x0/0x10 arch/x86/lib/retpoline.S:417
Code: cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc 66 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 e9 db 3d e9 f5 cc
RSP: 0018:ffffc900058afb18 EFLAGS: 00000293
RAX: 0000000000000000 RBX: ffffc900058afc40 RCX: ffffffff828d70e6
RDX: ffff8880320f0000 RSI: ffffffff828d70f4 RDI: ffff8880320f0000
RBP: ffffc900058afbc0 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 000000000000a6d2
R13: ffffffff8e414980 R14: 0000000000000000 R15: ffff8880911e9a18
path_init+0x1f4/0x1ab0 fs/namei.c:2692
path_parentat fs/namei.c:2855 [inline]
__filename_parentat+0x208/0x740 fs/namei.c:2880
filename_parentat fs/namei.c:2898 [inline]
filename_unlinkat+0xf7/0x730 fs/namei.c:5537
__do_sys_unlink fs/namei.c:5603 [inline]
__se_sys_unlink fs/namei.c:5600 [inline]
__x64_sys_unlink+0x46/0x70 fs/namei.c:5600
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: 0033:0x7f0812b15937
RSP: 002b:00007ffd53c0a9f8 EFLAGS: 00000206 ORIG_RAX: 0000000000000057
RAX: ffffffffffffffda RBX: 00007ffd53c0aa00 RCX: 00007f0812b15937
RDX: 0000000000000000 RSI: 00000000000003e9 RDI: 00007ffd53c0aa00
RBP: 000055d7513c9010 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000206 R12: 000000000aba9500
R13: 0000000003938700 R14: 000055d723799100 R15: 000055d723799140
rcu: rcu_preempt kthread starved for 10502 jiffies! g103037 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:27848 pid:16 tgid:16 ppid:2 task_flags:0x208040 flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5388 [inline]
__schedule+0x1295/0x67a0 kernel/sched/core.c:7189
__schedule_loop kernel/sched/core.c:7268 [inline]
schedule+0xdd/0x390 kernel/sched/core.c:7283
schedule_timeout+0x127/0x280 kernel/time/sleep_timeout.c:99
rcu_gp_fqs_loop+0x1a9/0x900 kernel/rcu/tree.c:2095
rcu_gp_kthread+0x179/0x230 kernel/rcu/tree.c:2297
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
rcu: Stack dump where RCU GP kthread last ran:
CPU: 1 UID: 0 PID: 15555 Comm: syz.3.2735 Tainted: G L syzkaller #0 PREEMPT(full)
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
RIP: 0010:csd_lock_wait kernel/smp.c:342 [inline]
RIP: 0010:smp_call_function_many_cond+0x589/0x1700 kernel/smp.c:892
Code: b8 00 00 00 00 00 fc ff df 48 8b 54 24 08 49 89 d5 49 89 d4 49 c1 ed 03 41 83 e4 07 49 01 c5 41 83 c4 03 e8 39 84 0c 00 f3 90 <41> 0f b6 45 00 41 38 c4 7c 08 84 c0 0f 85 63 0f 00 00 8b 45 08 31
RSP: 0018:ffffc90004ebfa00 EFLAGS: 00000246
RAX: 0000000000080000 RBX: 0000000000000000 RCX: ffffc9000f3fc000
RDX: 0000000000080000 RSI: ffffffff81fc0ce7 RDI: ffff888051624a80
RBP: ffff8880b8443360 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000000003
R13: ffffed101708866d R14: 0000000000000001 R15: ffff8880b853c600
FS: 00007ffaa15fb6c0(0000) GS:ffff888124486000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffaa15faff8 CR3: 00000000914d7000 CR4: 00000000003526f0
DR0: 0000000000000001 DR1: 00000000000001f8 DR2: 0000000000000003
DR3: ffffffffefffff15 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Call Trace:
clock_was_set+0x62b/0x870 kernel/time/hrtimer.c:999
do_adjtimex+0x302/0x370 kernel/time/timekeeping.c:2924
do_clock_adjtime kernel/time/posix-timers.c:1154 [inline]
__do_sys_clock_adjtime+0x177/0x290 kernel/time/posix-timers.c:1166
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: 0033:0x7ffaa079ce59
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:00007ffaa15fb028 EFLAGS: 00000246 ORIG_RAX: 0000000000000131
RAX: ffffffffffffffda RBX: 00007ffaa0a16090 RCX: 00007ffaa079ce59
RDX: 0000000000000000 RSI: 0000200000000280 RDI: 0000000000000000
RBP: 00007ffaa0832d6f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffaa0a16128 R14: 00007ffaa0a16090 R15: 00007ffd2d79f9a8