rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P5493/1:b..l
(detected by 1, t=10502 jiffies, g=85917, q=44 ncpus=2)
task:kworker/u4:7 state:R running task stack:23552 pid:5493 ppid:2 flags:0x00004000
Workqueue: netns cleanup_net
Call Trace:
context_switch kernel/sched/core.c:5244 [inline]
__schedule+0xb8a/0x5450 kernel/sched/core.c:6556
preempt_schedule_irq+0x52/0xa0 kernel/sched/core.c:6868
irqentry_exit+0x35/0x80 kernel/entry/common.c:432
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:649
RIP: 0010:lock_acquire+0x227/0x630 kernel/locking/lockdep.c:5636
Code: 18 a0 7e 83 f8 01 0f 85 3a 03 00 00 9c 58 f6 c4 02 0f 85 25 03 00 00 48 83 7c 24 08 00 74 01 fb 48 b8 00 00 00 00 00 fc ff df <48> 01 c3 48 c7 03 00 00 00 00 48 c7 43 08 00 00 00 00 48 8b 84 24
RSP: 0018:ffffc90003477a28 EFLAGS: 00000206
RAX: dffffc0000000000 RBX: 1ffff9200068ef48 RCX: 684f9dc0a5d7a8b0
RDX: 1ffff11006c8b94e RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000000 R09: ffffffff9133aa47
R10: fffffbfff2267548 R11: 0000000000000000 R12: 0000000000000002
R13: 0000000000000000 R14: ffffffff8c78e340 R15: 0000000000000000
rcu_lock_acquire include/linux/rcupdate.h:325 [inline]
rcu_read_lock include/linux/rcupdate.h:764 [inline]
inet_twsk_purge+0x132/0x8a0 net/ipv4/inet_timewait_sock.c:268
ops_exit_list+0x125/0x170 net/core/net_namespace.c:174
cleanup_net+0x4ee/0xb10 net/core/net_namespace.c:606
process_one_work+0x9bf/0x1710 kernel/workqueue.c:2289
worker_thread+0x669/0x1090 kernel/workqueue.c:2436
kthread+0x2e8/0x3a0 kernel/kthread.c:376
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306
rcu: rcu_preempt kthread timer wakeup didn't happen for 10249 jiffies! g85917 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: Possible timer handling issue on cpu=0 timer-softirq=67659
rcu: rcu_preempt kthread starved for 10250 jiffies! g85917 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:28728 pid:15 ppid:2 flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:5244 [inline]
__schedule+0xb8a/0x5450 kernel/sched/core.c:6556
schedule+0xde/0x1b0 kernel/sched/core.c:6632
schedule_timeout+0x14e/0x2a0 kernel/time/timer.c:2167
rcu_gp_fqs_loop+0x190/0x910 kernel/rcu/tree.c:1654
rcu_gp_kthread+0x23a/0x360 kernel/rcu/tree.c:1853
kthread+0x2e8/0x3a0 kernel/kthread.c:376
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306
rcu: Stack dump where RCU GP kthread last ran:
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 16890 Comm: syz-executor.5 Not tainted 6.1.0-syzkaller-10467-g6f1f5caed5bf #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022
RIP: 0010:__lock_acquire+0x171/0x56d0 kernel/locking/lockdep.c:4958
Code: 41 8b b5 30 0a 00 00 48 ba 00 00 00 00 00 fc ff df 48 c1 e9 03 0f b6 0c 11 48 c7 c2 80 a9 c0 91 83 e2 07 83 c2 03 89 74 24 10 <38> ca 7c 08 84 c9 0f 85 c7 13 00 00 83 7c 24 10 2f 8b 0d d8 a3 5e
RSP: 0018:ffffc90000007a88 EFLAGS: 00000006
RAX: ffffffff9133e460 RBX: 1ffff92000000f81 RCX: 0000000000000004
RDX: 0000000000000003 RSI: 0000000000000003 RDI: ffffffff8c7b6710
RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000001
R10: fffffbfff1ce75ca R11: 0000000000000000 R12: 0000000000000000
R13: ffff888079ad8280 R14: ffffffff8c7b6708 R15: 0000000000000002
FS: 00007fa2d11fe700(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2ef2f000 CR3: 0000000039222000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
lock_acquire kernel/locking/lockdep.c:5668 [inline]
lock_acquire+0x1e3/0x630 kernel/locking/lockdep.c:5633
seqcount_lockdep_reader_access include/linux/seqlock.h:102 [inline]
timekeeping_get_delta kernel/time/timekeeping.c:254 [inline]
timekeeping_get_ns kernel/time/timekeeping.c:388 [inline]
ktime_get_with_offset+0x1a6/0x500 kernel/time/timekeeping.c:891
alarm_forward_now+0x86/0x220 kernel/time/alarmtimer.c:477
alarm_handle_timer+0x155/0x230 kernel/time/alarmtimer.c:556
alarmtimer_fired+0x130/0x650 kernel/time/alarmtimer.c:210
__run_hrtimer kernel/time/hrtimer.c:1685 [inline]
__hrtimer_run_queues+0x690/0xfb0 kernel/time/hrtimer.c:1749
hrtimer_interrupt+0x320/0x790 kernel/time/hrtimer.c:1811
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1096 [inline]
__sysvec_apic_timer_interrupt+0x180/0x640 arch/x86/kernel/apic/apic.c:1113
sysvec_apic_timer_interrupt+0x92/0xc0 arch/x86/kernel/apic/apic.c:1107
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:649
RIP: 0010:__sanitizer_cov_trace_pc+0x0/0x70 kernel/kcov.c:200
Code: 66 e1 89 02 66 0f 1f 44 00 00 f3 0f 1e fa 48 8b be a8 01 00 00 e8 b0 ff ff ff 31 c0 c3 66 66 2e 0f 1f 84 00 00 00 00 00 66 90 0f 1e fa 65 8b 05 95 b4 82 7e 89 c1 48 8b 34 24 81 e1 00 01 00
RSP: 0018:ffffc900037e74f0 EFLAGS: 00000246
RAX: 0000000000040000 RBX: 0000000000000200 RCX: ffffc90015ab3000
RDX: 0000000000040000 RSI: ffffffff8170020e RDI: 0000000000000007
RBP: 0000000000000000 R08: 0000000000000007 R09: 0000000000000000
R10: 0000000000000200 R11: 0000000000000000 R12: ffffc900037e7570
R13: fffff520006fceaf R14: fffff520006fceae R15: ffff8880703bb770
__seqprop_raw_spinlock_sequence include/linux/seqlock.h:274 [inline]
ktime_get_coarse_real_ts64+0xd4/0x200 kernel/time/timekeeping.c:2261
current_time+0x79/0x2c0 fs/inode.c:2448
file_modified_flags+0x90/0x320 fs/inode.c:2111
ext4_write_checks fs/ext4/file.c:264 [inline]
ext4_buffered_write_iter+0xf9/0x460 fs/ext4/file.c:280
ext4_file_write_iter+0x8bf/0x1710 fs/ext4/file.c:700
call_write_iter include/linux/fs.h:2186 [inline]
do_iter_readv_writev+0x20b/0x3b0 fs/read_write.c:735
do_iter_write+0x182/0x700 fs/read_write.c:861
vfs_iter_write+0x74/0xa0 fs/read_write.c:902
iter_file_splice_write+0x745/0xc90 fs/splice.c:686
do_splice_from fs/splice.c:764 [inline]
direct_splice_actor+0x114/0x180 fs/splice.c:931
splice_direct_to_actor+0x335/0x8a0 fs/splice.c:886
do_splice_direct+0x1ab/0x280 fs/splice.c:974
do_sendfile+0xb19/0x1270 fs/read_write.c:1255
__do_sys_sendfile64 fs/read_write.c:1317 [inline]
__se_sys_sendfile64 fs/read_write.c:1309 [inline]
__x64_sys_sendfile64+0x14d/0x210 fs/read_write.c:1309
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7fa2d268c0d9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 f1 19 00 00 90 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 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fa2d11fe168 EFLAGS: 00000246 ORIG_RAX: 0000000000000028
RAX: ffffffffffffffda RBX: 00007fa2d27ac050 RCX: 00007fa2d268c0d9
RDX: 00000000200001c0 RSI: 0000000000000006 RDI: 0000000000000006
RBP: 00007fa2d26e7ae9 R08: 0000000000000000 R09: 0000000000000000
R10: 000000000200a198 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffcaae68c8f R14: 00007fa2d11fe300 R15: 0000000000022000