rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P13025/1:b..l
(detected by 0, t=10502 jiffies, g=71461, q=25 ncpus=2)
task:syz.6.2014 state:R running task stack:27512 pid:13025 ppid:12163 flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:5244 [inline]
__schedule+0x143f/0x4570 kernel/sched/core.c:6561
preempt_schedule_irq+0xf7/0x1c0 kernel/sched/core.c:6873
irqentry_exit+0x53/0x80 kernel/entry/common.c:439
asm_sysvec_reschedule_ipi+0x16/0x20 arch/x86/include/asm/idtentry.h:696
RIP: 0010:lock_acquire+0x26f/0x5a0 kernel/locking/lockdep.c:5666
Code: 2b 00 74 08 4c 89 f7 e8 af 54 77 00 f6 44 24 61 02 0f 85 84 01 00 00 41 f7 c7 00 02 00 00 74 01 fb 48 c7 44 24 40 0e 36 e0 45 <4b> c7 44 25 00 00 00 00 00 43 c7 44 25 09 00 00 00 00 43 c7 44 25
RSP: 0018:ffffc90005f3fa60 EFLAGS: 00000206
RAX: 0000000000000001 RBX: 1ffff92000be7f58 RCX: 1ffff92000be7ef8
RDX: dffffc0000000000 RSI: ffffffff8b0c2f40 RDI: ffffffff8b5f70e0
RBP: ffffc90005f3fbb0 R08: dffffc0000000000 R09: fffffbfff225764d
R10: 0000000000000000 R11: dffffc0000000001 R12: 1ffff92000be7f54
R13: dffffc0000000000 R14: ffffc90005f3fac0 R15: 0000000000000246
rcu_lock_acquire include/linux/rcupdate.h:350 [inline]
rcu_read_lock include/linux/rcupdate.h:791 [inline]
__fget_files+0x45/0x4a0 fs/file.c:883
__fget fs/file.c:892 [inline]
__fget_light fs/file.c:992 [inline]
__fdget+0x175/0x210 fs/file.c:1000
fdget include/linux/file.h:64 [inline]
sockfd_lookup_light net/socket.c:552 [inline]
__sys_sendmsg+0xe3/0x390 net/socket.c:2598
do_syscall_x64 arch/x86/entry/common.c:51 [inline]
do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:81
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7fe33ab8d169
RSP: 002b:00007fe33ba6e038 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007fe33ada6080 RCX: 00007fe33ab8d169
RDX: 0000000020008040 RSI: 0000000000000000 RDI: ffffffffffffffff
RBP: 00007fe33ac0e2a0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007fe33ada6080 R15: 00007ffe4509ce98
rcu: rcu_preempt kthread starved for 10496 jiffies! g71461 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:26712 pid:16 ppid:2 flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:5244 [inline]
__schedule+0x143f/0x4570 kernel/sched/core.c:6561
schedule+0xbf/0x180 kernel/sched/core.c:6637
schedule_timeout+0x1b9/0x300 kernel/time/timer.c:1965
rcu_gp_fqs_loop+0x2d2/0x1150 kernel/rcu/tree.c:1706
rcu_gp_kthread+0xa3/0x3b0 kernel/rcu/tree.c:1905
kthread+0x28d/0x320 kernel/kthread.c:376
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
rcu: Stack dump where RCU GP kthread last ran:
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 13024 Comm: syz.6.2014 Not tainted 6.1.132-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
RIP: 0010:find_held_lock kernel/locking/lockdep.c:-1 [inline]
RIP: 0010:__lock_release kernel/locking/lockdep.c:5337 [inline]
RIP: 0010:lock_release+0x269/0xa20 kernel/locking/lockdep.c:5682
Code: 00 49 63 dd 83 fb 31 0f 83 f5 05 00 00 48 8d 04 9b 4d 8d 24 c6 49 89 c6 4c 89 e7 48 8b 74 24 18 e8 1c bc 46 09 44 89 6c 24 3c <44> 89 ea 85 c0 0f 84 f2 01 00 00 4d 85 e4 0f 84 1c 03 00 00 49 8d
RSP: 0018:ffffc900001e0b20 EFLAGS: 00000046
RAX: 0000000000000001 RBX: 0000000000000000 RCX: ffffc900001e0b03
RDX: ffff8880270ce418 RSI: ffff888020373060 RDI: ffff8880270ce420
RBP: ffffc900001e0c50 R08: dffffc0000000000 R09: fffffbfff1d416c6
R10: 0000000000000000 R11: dffffc0000000001 R12: ffff8880270ce420
R13: 0000000000000000 R14: 0000000000000000 R15: dffffc0000000000
FS: 00007fe33ba8f6c0(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000032000 CR3: 0000000062827000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:149 [inline]
_raw_spin_unlock_irqrestore+0x75/0x130 kernel/locking/spinlock.c:194
spin_unlock_irqrestore include/linux/spinlock.h:406 [inline]
unlock_timer kernel/time/posix-timers.c:171 [inline]
posix_timer_fn+0x2ca/0x390 kernel/time/posix-timers.c:432
__run_hrtimer kernel/time/hrtimer.c:1691 [inline]
__hrtimer_run_queues+0x5e5/0xe50 kernel/time/hrtimer.c:1755
hrtimer_interrupt+0x392/0x980 kernel/time/hrtimer.c:1817
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1107 [inline]
__sysvec_apic_timer_interrupt+0x158/0x5b0 arch/x86/kernel/apic/apic.c:1124
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1118 [inline]
sysvec_apic_timer_interrupt+0x9b/0xc0 arch/x86/kernel/apic/apic.c:1118
asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:691
RIP: 0010:__raw_spin_unlock_irq include/linux/spinlock_api_smp.h:160 [inline]
RIP: 0010:_raw_spin_unlock_irq+0x25/0x40 kernel/locking/spinlock.c:202
Code: f1 84 f5 ff 90 53 48 89 fb 48 83 c7 18 48 8b 74 24 08 e8 7e cb ae f6 48 89 df e8 e6 09 b0 f6 e8 a1 5b d5 f6 fb bf 01 00 00 00 f6 89 a2 f6 65 8b 05 b7 5f 46 75 85 c0 74 02 5b c3 e8 54 83 44
RSP: 0018:ffffc90005dcfb30 EFLAGS: 00000286
RAX: 46bfb8effcb70d00 RBX: ffff8880579d8000 RCX: ffffffff973c2103
RDX: dffffc0000000000 RSI: ffffffff8b0c1dc0 RDI: 0000000000000001
RBP: ffffc90005dcfc70 R08: dffffc0000000000 R09: ffffed100af3b001
R10: 0000000000000000 R11: dffffc0000000001 R12: 1ffff1100af3b093
R13: 000000001c000004 R14: 0000000000000021 R15: ffff8880579d8498
spin_unlock_irq include/linux/spinlock.h:401 [inline]
get_signal+0x151f/0x17a0 kernel/signal.c:2874
arch_do_signal_or_restart+0xb0/0x1a10 arch/x86/kernel/signal.c:871
exit_to_user_mode_loop+0x6a/0x100 kernel/entry/common.c:174
exit_to_user_mode_prepare+0xb1/0x140 kernel/entry/common.c:210
__syscall_exit_to_user_mode_work kernel/entry/common.c:292 [inline]
syscall_exit_to_user_mode+0x60/0x270 kernel/entry/common.c:303
do_syscall_64+0x47/0xb0 arch/x86/entry/common.c:87
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7fe33ab8d169
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fe33ba8f038 EFLAGS: 00000246
RAX: 0000000000018ff8 RBX: 00007fe33ada5fa0 RCX: 00007fe33ab8d169
RDX: 0000000000018ff8 RSI: 0000200000019680 RDI: 0000000000000006
RBP: 00007fe33ac0e2a0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007fe33ada5fa0 R15: 00007ffe4509ce98