rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P5626/1:b..l
rcu: (detected by 1, t=10505 jiffies, g=46901, q=2376 ncpus=2)
task:syz-executor state:R running task stack:23448 pid:5626 tgid:5626 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_reschedule_ipi+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:lock_acquire+0x5e/0x370 kernel/locking/lockdep.c:5872
Code: 05 fb 03 25 12 83 f8 07 0f 87 d9 02 00 00 48 0f a3 05 06 8d f2 0e 0f 82 a4 02 00 00 8b 35 8e c0 f2 0e 85 f6 0f 85 bf 00 00 00 <48> 8b 44 24 30 65 48 2b 05 9d 03 25 12 0f 85 ed 02 00 00 48 83 c4
RSP: 0018:ffffc900045ef800 EFLAGS: 00000206
RAX: 0000000000000046 RBX: 0000000000000000 RCX: 0000000000000001
RDX: 0000000000000000 RSI: ffffffff8deea8c4 RDI: ffffffff8c1c4780
RBP: ffffffff8e7e5560 R08: 000000001e608474 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]
is_bpf_text_address+0x36/0x1a0 kernel/bpf/core.c:747
kernel_text_address kernel/extable.c:125 [inline]
kernel_text_address+0x8d/0x100 kernel/extable.c:94
__kernel_text_address+0xd/0x30 kernel/extable.c:79
unwind_get_return_address+0x59/0xa0 arch/x86/kernel/unwind_orc.c:385
arch_stack_walk+0xa6/0xf0 arch/x86/kernel/stacktrace.c:26
stack_trace_save+0x8e/0xc0 kernel/stacktrace.c:122
kasan_save_stack+0x30/0x50 mm/kasan/common.c:57
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
kmalloc_noprof include/linux/slab.h:950 [inline]
slab_free_hook mm/slub.c:2641 [inline]
slab_free mm/slub.c:6251 [inline]
kmem_cache_free+0x41e/0x6c0 mm/slub.c:6378
sk_prot_free net/core/sock.c:2289 [inline]
__sk_destruct+0x62a/0xab0 net/core/sock.c:2391
sk_destruct+0xc8/0xf0 net/core/sock.c:2419
__sk_free+0xf4/0x3e0 net/core/sock.c:2430
sk_free+0x61/0x90 net/core/sock.c:2441
sock_put include/net/sock.h:2011 [inline]
tcp_close+0xc6/0x110 net/ipv4/tcp.c:3317
inet_release+0xed/0x200 net/ipv4/af_inet.c:442
__sock_release+0xb3/0x260 net/socket.c:722
sock_close+0x1c/0x30 net/socket.c:1515
__fput+0x3ff/0xb50 fs/file_table.c:510
fput_close_sync+0x118/0x250 fs/file_table.c:615
__do_sys_close fs/open.c:1507 [inline]
__se_sys_close fs/open.c:1492 [inline]
__x64_sys_close+0x8b/0x120 fs/open.c:1492
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: 0033:0x7fedcef5d68e
RSP: 002b:00007ffc2ee009e8 EFLAGS: 00000246 ORIG_RAX: 0000000000000003
RAX: ffffffffffffffda RBX: 0000555593ac2500 RCX: 00007fedcef5d68e
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000003
RBP: 00007ffc2ee00a8c R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000000000ab
R13: 00000000000927c0 R14: 0000000000075fd1 R15: 00007ffc2ee00ae0
rcu: rcu_preempt kthread timer wakeup didn't happen for 10504 jiffies! g46901 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: Possible timer handling issue on cpu=0 timer-softirq=28117
rcu: rcu_preempt kthread starved for 10505 jiffies! g46901 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:27992 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: 4986 Comm: udevd Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
RIP: 0010:__run_hrtimer kernel/time/hrtimer.c:1945 [inline]
RIP: 0010:__hrtimer_run_queues+0x1c9/0xa00 kernel/time/hrtimer.c:1994
Code: 89 ee e8 da 2c 14 00 45 84 ed 0f 85 93 05 00 00 e8 7c 32 14 00 48 8b 3c 24 e8 23 00 98 09 89 de bf 01 00 00 00 e8 17 2d 14 00 <83> fb 01 0f 84 20 05 00 00 e8 59 32 14 00 48 8b 44 24 10 48 c1 e8
RSP: 0018:ffffc90000007e88 EFLAGS: 00000046
RAX: 0000000000010001 RBX: 0000000000000001 RCX: ffffffff81f47f19
RDX: 0000000000000001 RSI: 0000000000000001 RDI: ffff88807e48ca80
RBP: ffff8880b8428700 R08: 0000000000000005 R09: 0000000000000001
R10: 0000000000000001 R11: 0000000000000001 R12: ffff88802ba8d300
R13: 0000000000000001 R14: dffffc0000000000 R15: ffff8880b8428750
FS: 00007f7f551b2880(0000) GS:ffff888124387000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f40403fdff8 CR3: 000000007e4f8000 CR4: 00000000003526f0
Call Trace:
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:arch_stack_walk+0x94/0xf0 arch/x86/kernel/stacktrace.c:24
Code: fe 48 89 df e8 3d 0b 09 00 8b 95 70 ff ff ff 85 d2 75 21 eb 2f 4c 89 ef 2e 2e 2e 41 ff d4 84 c0 74 22 48 89 df e8 7c ea 08 00 <8b> 85 70 ff ff ff 85 c0 74 10 48 89 df e8 da e6 08 00 48 89 c6 48
RSP: 0018:ffffc9000478f2d0 EFLAGS: 00000282
RAX: 0000000000000001 RBX: ffffc9000478f2d0 RCX: ffffc9000478f224
RDX: 0000000000000000 RSI: ffffffff8deea8c4 RDI: ffff88807e48cf44
RBP: ffffc9000478f360 R08: 0000000000000001 R09: 0000000000000007
R10: 0000000000000200 R11: 0000000000000001 R12: ffffffff81f2f5b0
R13: ffffc9000478f390 R14: 0000000000000000 R15: ffff88807e48ca80
stack_trace_save+0x8e/0xc0 kernel/stacktrace.c:122
kasan_save_stack+0x30/0x50 mm/kasan/common.c:57
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:5296 [inline]
__kmalloc_noprof+0x301/0x850 mm/slub.c:5308
kmalloc_noprof include/linux/slab.h:954 [inline]
kzalloc_noprof include/linux/slab.h:1188 [inline]
tomoyo_encode2+0xfb/0x3c0 security/tomoyo/realpath.c:45
tomoyo_encode+0x29/0x50 security/tomoyo/realpath.c:80
tomoyo_realpath_from_path+0x18c/0x690 security/tomoyo/realpath.c:283
tomoyo_get_realpath security/tomoyo/file.c:151 [inline]
tomoyo_check_open_permission+0x2af/0x3c0 security/tomoyo/file.c:776
tomoyo_file_open+0x6b/0x90 security/tomoyo/tomoyo.c:334
security_file_open+0xb5/0x1e0 security/security.c:2739
do_dentry_open+0x588/0x14d0 fs/open.c:924
vfs_open+0x82/0x3f0 fs/open.c:1079
do_open fs/namei.c:4699 [inline]
path_openat+0x208c/0x31a0 fs/namei.c:4858
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: 0033:0x7f7f54b15c3a
Code: 41 89 f2 48 89 54 24 e0 41 83 e2 40 75 2a 89 f0 f7 d0 a9 00 00 41 00 74 1f 89 f2 b8 01 01 00 00 48 89 fe bf 9c ff ff ff 0f 05 <48> 3d 00 f0 ff ff 77 2e c3 0f 1f 44 00 00 48 8d 44 24 08 c7 44 24
RSP: 002b:00007ffd02db0c78 EFLAGS: 00000206 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 000056291e043de0 RCX: 00007f7f54b15c3a
RDX: 0000000000090800 RSI: 000056291e033240 RDI: 00000000ffffff9c
RBP: 000056291e033240 R08: 0000000000000000 R09: 0000000000000001
R10: 0000000000000000 R11: 0000000000000206 R12: 000056291e02f170
R13: 00000000000000ff R14: 00005628e8cc2be0 R15: 00007ffd02db0f00