rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P4987/1:b..l P15211/1:b..l
rcu: (detected by 1, t=10505 jiffies, g=115953, q=278 ncpus=2)
task:syz-executor state:R running task stack:23944 pid:15211 tgid:15211 ppid:15208 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:lock_acquire+0x5e/0x370 kernel/locking/lockdep.c:5872
Code: 05 3b 45 25 12 83 f8 07 0f 87 d9 02 00 00 48 0f a3 05 46 84 f2 0e 0f 82 a4 02 00 00 8b 35 ce b7 f2 0e 85 f6 0f 85 bf 00 00 00 <48> 8b 44 24 30 65 48 2b 05 dd 44 25 12 0f 85 ed 02 00 00 48 83 c4
RSP: 0018:ffffc9001c7a6d58 EFLAGS: 00000206
RAX: 0000000000000046 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff8dee9f9e RDI: ffffffff8c1c4480
RBP: ffffffff8e7e5560 R08: 0000000086db7919 R09: 0000000000000007
R10: 0000000000000200 R11: 0000000000000000 R12: 0000000000000002
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
rcu_lock_acquire include/linux/rcupdate.h:300 [inline]
rcu_read_lock include/linux/rcupdate.h:838 [inline]
class_rcu_constructor include/linux/rcupdate.h:1181 [inline]
unwind_next_frame+0xd1/0x2090 arch/x86/kernel/unwind_orc.c:495
arch_stack_walk+0x94/0xf0 arch/x86/kernel/stacktrace.c:25
stack_trace_save+0x8e/0xc0 kernel/stacktrace.c:122
save_stack+0x162/0x1e0 mm/page_owner.c:165
__set_page_owner+0x8c/0x540 mm/page_owner.c:341
set_page_owner include/linux/page_owner.h:32 [inline]
post_alloc_hook+0xfd/0x120 mm/page_alloc.c:1853
prep_new_page mm/page_alloc.c:1861 [inline]
get_page_from_freelist+0x11a6/0x3410 mm/page_alloc.c:3941
__alloc_frozen_pages_noprof+0x27c/0x2bc0 mm/page_alloc.c:5221
__alloc_pages_noprof mm/page_alloc.c:5255 [inline]
alloc_pages_bulk_noprof+0x649/0x1360 mm/page_alloc.c:5175
___alloc_pages_bulk mm/kasan/shadow.c:345 [inline]
__kasan_populate_vmalloc_do mm/kasan/shadow.c:370 [inline]
__kasan_populate_vmalloc+0xf0/0x210 mm/kasan/shadow.c:424
kasan_populate_vmalloc include/linux/kasan.h:580 [inline]
alloc_vmap_area+0x95d/0x2b70 mm/vmalloc.c:2123
__get_vm_area_node+0x1ca/0x330 mm/vmalloc.c:3226
__vmalloc_node_range_noprof+0x228/0x1630 mm/vmalloc.c:4024
__vmalloc_node_noprof+0xad/0xf0 mm/vmalloc.c:4124
xt_counters_alloc+0x4c/0x70 net/netfilter/x_tables.c:1474
__do_replace+0x97/0x990 net/ipv4/netfilter/arp_tables.c:906
do_replace net/ipv6/netfilter/ip6_tables.c:1158 [inline]
do_ip6t_set_ctl+0x91e/0xba0 net/ipv6/netfilter/ip6_tables.c:1644
nf_setsockopt+0x8d/0xf0 net/netfilter/nf_sockopt.c:101
ipv6_setsockopt+0x135/0x170 net/ipv6/ipv6_sockglue.c:970
tcp_setsockopt+0xa7/0x100 net/ipv4/tcp.c:4182
do_sock_setsockopt+0xf3/0x1d0 net/socket.c:2381
__sys_setsockopt+0x195/0x220 net/socket.c:2406
__do_sys_setsockopt net/socket.c:2412 [inline]
__se_sys_setsockopt net/socket.c:2409 [inline]
__x64_sys_setsockopt+0xbd/0x160 net/socket.c:2409
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: 0033:0x7f420d79e69a
RSP: 002b:00007ffc6f804408 EFLAGS: 00000206 ORIG_RAX: 0000000000000036
RAX: ffffffffffffffda RBX: 00007ffc6f804490 RCX: 00007f420d79e69a
RDX: 0000000000000040 RSI: 0000000000000029 RDI: 0000000000000003
RBP: 0000000000000003 R08: 00000000000003b8 R09: 0000000000000000
R10: 00007f420d9e8e60 R11: 0000000000000206 R12: 00007f420d9e8e00
R13: 00007ffc6f80442c R14: 0000000000000000 R15: 00007f420d9eafc0
task:udevd state:R running task stack:24136 pid:4987 tgid:4987 ppid:1 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_reschedule_ipi+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:lock_acquire+0x5e/0x370 kernel/locking/lockdep.c:5872
Code: 05 3b 45 25 12 83 f8 07 0f 87 d9 02 00 00 48 0f a3 05 46 84 f2 0e 0f 82 a4 02 00 00 8b 35 ce b7 f2 0e 85 f6 0f 85 bf 00 00 00 <48> 8b 44 24 30 65 48 2b 05 dd 44 25 12 0f 85 ed 02 00 00 48 83 c4
RSP: 0018:ffffc9000336f060 EFLAGS: 00000206
RAX: 0000000000000046 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff8dee9f9e RDI: ffffffff8c1c4480
RBP: ffffffff8e7e5560 R08: 0000000086db7919 R09: 0000000000000007
R10: 0000000000000200 R11: 0000000000000000 R12: 0000000000000002
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
rcu_lock_acquire include/linux/rcupdate.h:300 [inline]
rcu_read_lock include/linux/rcupdate.h:838 [inline]
class_rcu_constructor include/linux/rcupdate.h:1181 [inline]
unwind_next_frame+0xd1/0x2090 arch/x86/kernel/unwind_orc.c:495
arch_stack_walk+0x94/0xf0 arch/x86/kernel/stacktrace.c:25
stack_trace_save+0x8e/0xc0 kernel/stacktrace.c:122
kasan_save_stack+0x30/0x50 mm/kasan/common.c:57
kasan_record_aux_stack+0xa7/0xc0 mm/kasan/generic.c:556
__call_rcu_common.constprop.0+0xa5/0x9b0 kernel/rcu/tree.c:3131
security_inode_free+0xa4/0x170 security/security.c:1253
__destroy_inode+0x1ea/0x710 fs/inode.c:369
destroy_inode+0x91/0x1c0 fs/inode.c:392
evict+0x599/0xad0 fs/inode.c:865
iput_final fs/inode.c:1960 [inline]
iput.part.0+0x605/0xf50 fs/inode.c:2009
iput+0x35/0x40 fs/inode.c:1975
dentry_unlink_inode+0x2c0/0x4c0 fs/dcache.c:476
__dentry_kill+0x1d0/0x690 fs/dcache.c:718
shrink_kill fs/dcache.c:1195 [inline]
shrink_dentry_list+0x180/0x5e0 fs/dcache.c:1222
shrink_dcache_tree+0x3b1/0x7e0 fs/dcache.c:1653
shrink_dcache_parent fs/dcache.c:1693 [inline]
d_invalidate fs/dcache.c:1775 [inline]
d_invalidate+0x13a/0x290 fs/dcache.c:1760
lookup_fast+0x3f4/0x600 fs/namei.c:1880
walk_component fs/namei.c:2274 [inline]
link_path_walk+0x7d4/0x1cc0 fs/namei.c:2652
path_openat+0x1be/0x31a0 fs/namei.c:4854
do_file_open+0x20e/0x430 fs/namei.c:4887
do_sys_openat2+0x10d/0x1e0 fs/open.c:1364
do_sys_open fs/open.c:1370 [inline]
__do_sys_openat fs/open.c:1386 [inline]
__se_sys_openat fs/open.c:1381 [inline]
__x64_sys_openat+0x12d/0x210 fs/open.c:1381
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: 0033:0x7f64ee6a7407
RSP: 002b:00007ffde58e9e20 EFLAGS: 00000202 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007f64eee19880 RCX: 00007f64ee6a7407
RDX: 0000000000080000 RSI: 00007ffde58e9fa0 RDI: ffffffffffffff9c
RBP: 0000000000000008 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000202 R12: 000055b2196387f5
R13: 000055b2196387f5 R14: 0000000000000001 R15: 0000000000000000
rcu: rcu_preempt kthread timer wakeup didn't happen for 10504 jiffies! g115953 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: Possible timer handling issue on cpu=0 timer-softirq=61254
rcu: rcu_preempt kthread starved for 10505 jiffies! g115953 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:28216 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:
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 16540 Comm: syz.4.2949 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:__lock_release kernel/locking/lockdep.c:5536 [inline]
RIP: 0010:lock_release kernel/locking/lockdep.c:5889 [inline]
RIP: 0010:lock_release+0xdb/0x310 kernel/locking/lockdep.c:5875
Code: 0f 84 ad 00 00 00 45 8b bc 24 88 0b 00 00 45 85 ff 0f 84 9c 01 00 00 48 8d 4c 24 0c 44 89 fa 48 89 de 4c 89 e7 e8 75 88 ff ff <48> 85 c0 0f 84 80 01 00 00 8b 50 24 85 d2 0f 85 df 01 00 00 66 83
RSP: 0018:ffffc90000007e28 EFLAGS: 00000002
RAX: ffff88802fd98b90 RBX: ffff8880b84284d8 RCX: ffffc90000007e34
RDX: 0000000000000001 RSI: ffff8880b84284d8 RDI: ffff88802fd98b90
RBP: ffffffff81f47f93 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000001 R12: ffff88802fd98000
R13: 0000000000000001 R14: 0000000000000087 R15: 0000000000000001
FS: 00007f74f8f0e6c0(0000) GS:ffff888124383000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 0000000035118000 CR4: 00000000003526f0
Call Trace:
__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:176 [inline]
_raw_spin_unlock_irqrestore+0x1a/0x80 kernel/locking/spinlock.c:198
__run_hrtimer kernel/time/hrtimer.c:1926 [inline]
__hrtimer_run_queues+0x383/0xa00 kernel/time/hrtimer.c:1994
hrtimer_interrupt+0x3e5/0x940 kernel/time/hrtimer.c:2113
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1050 [inline]
__sysvec_apic_timer_interrupt+0x10b/0x460 arch/x86/kernel/apic/apic.c:1067
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1061 [inline]
sysvec_apic_timer_interrupt+0x9e/0xc0 arch/x86/kernel/apic/apic.c:1061
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:ktime_mono_to_any+0x40/0x90 kernel/time/timekeeping.c:1057
Code: 02 77 4d 4a 8d 3c e5 00 e7 b2 8b 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 75 49 4a 8b 1c e5 00 e7 b2 8b <48> b8 00 00 00 00 00 fc ff df 48 89 da 48 c1 ea 03 80 3c 02 00 75
RSP: 0018:ffffc90003b0fc48 EFLAGS: 00000246
RAX: dffffc0000000000 RBX: ffffffff9b197f10 RCX: ffffc900060da000
RDX: 1ffffffff1765ce0 RSI: ffffffff81f4efd3 RDI: ffffffff8bb2e700
RBP: 0000000000000000 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000080000000 R11: 0000000000000000 R12: 0000000000000000
R13: 1ffff92000761f9f R14: 0000000000000000 R15: 0000000000000000
ktime_mono_to_real include/linux/timekeeping.h:165 [inline]
timerfd_clock_was_set+0x1c/0x310 fs/timerfd.c:97
clock_was_set+0x661/0x870 kernel/time/hrtimer.c:1004
do_settimeofday64+0x330/0x4d0 kernel/time/timekeeping.c:1603
do_sys_settimeofday64+0x1dc/0x260 kernel/time/time.c:195
__do_sys_clock_settime kernel/time/posix-timers.c:1124 [inline]
__se_sys_clock_settime kernel/time/posix-timers.c:1108 [inline]
__x64_sys_clock_settime+0x1c1/0x2a0 kernel/time/posix-timers.c:1108
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: 0033:0x7f74f7f9ce59
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:00007f74f8f0e028 EFLAGS: 00000246 ORIG_RAX: 00000000000000e3
RAX: ffffffffffffffda RBX: 00007f74f8215fa0 RCX: 00007f74f7f9ce59
RDX: 0000000000000000 RSI: 0000200000000240 RDI: 0000000000000000
RBP: 00007f74f8032d6f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f74f8216038 R14: 00007f74f8215fa0 R15: 00007ffc99b9bad8