hrtimer: interrupt took 8324755138 ns
rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 1-...!: (1 GPs behind) idle=efb/1/0x4000000000000000 softirq=78157/78158 fqs=1
(t=12476 jiffies g=138125 q=1706)
rcu: rcu_preempt kthread timer wakeup didn't happen for 11693 jiffies! g138125 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: Possible timer handling issue on cpu=0 timer-softirq=50028
rcu: rcu_preempt kthread starved for 11694 jiffies! g138125 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:28008 pid: 14 ppid: 2 flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:4969 [inline]
__schedule+0xa9a/0x4940 kernel/sched/core.c:6250
schedule+0xd2/0x260 kernel/sched/core.c:6323
schedule_timeout+0x14a/0x2a0 kernel/time/timer.c:1881
rcu_gp_fqs_loop+0x186/0x810 kernel/rcu/tree.c:1955
rcu_gp_kthread+0x1de/0x320 kernel/rcu/tree.c:2128
kthread+0x405/0x4f0 kernel/kthread.c:327
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 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 9233 Comm: kworker/0:11 Not tainted 5.15.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: events fqdir_free_fn
RIP: 0010:csd_lock_wait kernel/smp.c:440 [inline]
RIP: 0010:smp_call_function_single+0x1b5/0x4b0 kernel/smp.c:758
Code: 48 8d 74 24 40 48 89 44 24 50 48 8b 44 24 08 48 89 44 24 58 e8 bc fa ff ff 41 89 c5 eb 07 e8 72 6e 0b 00 f3 90 44 8b 64 24 48 <31> ff 41 83 e4 01 44 89 e6 e8 9d 75 0b 00 45 85 e4 75 e1 e8 53 6e
RSP: 0018:ffffc90004e2fbc0 EFLAGS: 00000293
RAX: 0000000000000000 RBX: 1ffff920009c5f7c RCX: 0000000000000000
RDX: ffff8880184a1d00 RSI: ffffffff816c041e RDI: 0000000000000003
RBP: ffffc90004e2fc90 R08: 0000000000000000 R09: ffffffff8fd38a07
R10: ffffffff816c0433 R11: 0000000000000000 R12: 0000000000000011
R13: 0000000000000000 R14: 0000000000000001 R15: ffff8880b9d3a900
FS: 0000000000000000(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000555556234848 CR3: 000000007313d000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
rcu_barrier+0x2a6/0x440 kernel/rcu/tree.c:4024
fqdir_free_fn+0x2e/0x160 net/ipv4/inet_fragment.c:163
process_one_work+0x9b2/0x1690 kernel/workqueue.c:2297
worker_thread+0x658/0x11f0 kernel/workqueue.c:2444
kthread+0x405/0x4f0 kernel/kthread.c:327
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
NMI backtrace for cpu 1
CPU: 1 PID: 2941 Comm: systemd-udevd Not tainted 5.15.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106
nmi_cpu_backtrace.cold+0x47/0x144 lib/nmi_backtrace.c:105
nmi_trigger_cpumask_backtrace+0x1ae/0x220 lib/nmi_backtrace.c:62
trigger_single_cpu_backtrace include/linux/nmi.h:164 [inline]
rcu_dump_cpu_stacks+0x25e/0x3f0 kernel/rcu/tree_stall.h:343
print_cpu_stall kernel/rcu/tree_stall.h:627 [inline]
check_cpu_stall kernel/rcu/tree_stall.h:711 [inline]
rcu_pending kernel/rcu/tree.c:3878 [inline]
rcu_sched_clock_irq.cold+0x9d/0x746 kernel/rcu/tree.c:2597
update_process_times+0x16d/0x200 kernel/time/timer.c:1785
tick_sched_handle+0x9b/0x180 kernel/time/tick-sched.c:226
tick_sched_timer+0x1b0/0x2d0 kernel/time/tick-sched.c:1421
__run_hrtimer kernel/time/hrtimer.c:1685 [inline]
__hrtimer_run_queues+0x1c0/0xe50 kernel/time/hrtimer.c:1749
hrtimer_interrupt+0x31c/0x790 kernel/time/hrtimer.c:1811
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1086 [inline]
__sysvec_apic_timer_interrupt+0x146/0x530 arch/x86/kernel/apic/apic.c:1103
sysvec_apic_timer_interrupt+0x8e/0xc0 arch/x86/kernel/apic/apic.c:1097
asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:638
RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:152 [inline]
RIP: 0010:_raw_spin_unlock_irqrestore+0x38/0x70 kernel/locking/spinlock.c:194
Code: 74 24 10 e8 5a 6d 22 f8 48 89 ef e8 a2 e3 22 f8 81 e3 00 02 00 00 75 25 9c 58 f6 c4 02 75 2d 48 85 db 74 01 fb bf 01 00 00 00 43 ab 15 f8 65 8b 05 1c 42 c8 76 85 c0 74 0a 5b 5d c3 e8 40 7f
RSP: 0018:ffffc90002b8fc30 EFLAGS: 00000206
RAX: 0000000000000002 RBX: 0000000000000200 RCX: 1ffffffff1fae6ce
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000001
RBP: ffffffff8bb56ef8 R08: 0000000000000001 R09: ffffffff8fd38a9f
R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000000246
R13: ffffc90002b8fc68 R14: ffffffff8bb56f38 R15: ffffffff8bb56ef8
rwsem_wake.isra.0+0xbb/0x110 kernel/locking/rwsem.c:1189
__up_read+0x2b5/0x720 kernel/locking/rwsem.c:1311
kernfs_fop_readdir+0x481/0x890 fs/kernfs/dir.c:1723
iterate_dir+0x576/0x700 fs/readdir.c:65
__do_sys_getdents fs/readdir.c:286 [inline]
__se_sys_getdents fs/readdir.c:271 [inline]
__x64_sys_getdents+0x13a/0x2b0 fs/readdir.c:271
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x7f0c44ae8f2b
Code: fc ff 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 41 57 41 56 48 63 ff 41 55 41 54 b8 4e 00 00 00 55 53 48 89 f3 48 83 ec 08 0f 05 <48> 3d 00 f0 ff ff 77 55 48 8d 2c 06 49 89 c4 48 39 ee 73 34 90 44
RSP: 002b:00007ffdb0bd1be0 EFLAGS: 00000202 ORIG_RAX: 000000000000004e
RAX: ffffffffffffffda RBX: 000055f60d82d7f0 RCX: 00007f0c44ae8f2b
RDX: 0000000000008000 RSI: 000055f60d82d7f0 RDI: 000000000000000f
RBP: 000055f60d82d7f0 R08: 00007f0c44dcf308 R09: 0000000000008040
R10: 00007f0c44dceb58 R11: 0000000000000202 R12: fffffffffffffe50
R13: 0000000000000000 R14: 00000000000000ff R15: 000055f60d814400
----------------
Code disassembly (best guess):
0: 48 8d 74 24 40 lea 0x40(%rsp),%rsi
5: 48 89 44 24 50 mov %rax,0x50(%rsp)
a: 48 8b 44 24 08 mov 0x8(%rsp),%rax
f: 48 89 44 24 58 mov %rax,0x58(%rsp)
14: e8 bc fa ff ff callq 0xfffffad5
19: 41 89 c5 mov %eax,%r13d
1c: eb 07 jmp 0x25
1e: e8 72 6e 0b 00 callq 0xb6e95
23: f3 90 pause
25: 44 8b 64 24 48 mov 0x48(%rsp),%r12d
* 2a: 31 ff xor %edi,%edi <-- trapping instruction
2c: 41 83 e4 01 and $0x1,%r12d
30: 44 89 e6 mov %r12d,%esi
33: e8 9d 75 0b 00 callq 0xb75d5
38: 45 85 e4 test %r12d,%r12d
3b: 75 e1 jne 0x1e
3d: e8 .byte 0xe8
3e: 53 push %rbx
3f: 6e outsb %ds:(%rsi),(%dx)