rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 0-...!: (10499 ticks this GP) idle=f87/1/0x4000000000000000 softirq=45478/45478 fqs=13
(t=10500 jiffies g=75809 q=157)
rcu: rcu_preempt kthread starved for 10472 jiffies! g75809 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:28208 pid: 14 ppid: 2 flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:4965 [inline]
__schedule+0xa9a/0x4940 kernel/sched/core.c:6246
schedule+0xd2/0x260 kernel/sched/core.c:6319
schedule_timeout+0x14a/0x2a0 kernel/time/timer.c:1881
rcu_gp_fqs_loop+0x186/0x810 kernel/rcu/tree.c:1966
rcu_gp_kthread+0x1de/0x320 kernel/rcu/tree.c:2139
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 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 17904 Comm: kworker/1:15 Not tainted 5.15.0-rc5-next-20211015-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: events prog_array_map_clear_deferred
RIP: 0010:__lock_acquire+0xb58/0x54a0 kernel/locking/lockdep.c:5022
Code: b8 00 00 00 00 00 fc ff df 48 c1 ea 03 0f b6 14 02 48 c7 c0 a8 06 90 8d 83 e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 90 45 00 00 <8b> 05 9a d6 33 0c 85 c0 0f 85 a3 00 00 00 8b 44 24 18 85 c0 0f 85
RSP: 0000:ffffc9000493f8b0 EFLAGS: 00000046
RAX: 0000000000000003 RBX: 000000001468e735 RCX: ffffffff815c34ca
RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffff888088a7c4d9
RBP: ffff888088a7c4da R08: 0000000000000000 R09: ffffffff8ff44b77
R10: fffffbfff1fe896e R11: 0000000000000000 R12: ffff888088a7c4b8
R13: ffff888088a7ba00 R14: 0000000000000000 R15: 51468e7399dc752c
FS: 0000000000000000(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000c8e818 CR3: 000000007f49b000 CR4: 00000000003526e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
lock_acquire kernel/locking/lockdep.c:5637 [inline]
lock_acquire+0x1ab/0x510 kernel/locking/lockdep.c:5602
__mutex_lock_common kernel/locking/mutex.c:599 [inline]
__mutex_lock+0x12f/0x12f0 kernel/locking/mutex.c:732
fd_array_map_delete_elem+0x120/0x2e0 kernel/bpf/arraymap.c:821
bpf_fd_array_map_clear kernel/bpf/arraymap.c:871 [inline]
prog_array_map_clear_deferred+0x10b/0x1b0 kernel/bpf/arraymap.c:1050
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 0
CPU: 0 PID: 9393 Comm: kworker/0:16 Not tainted 5.15.0-rc5-next-20211015-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: events prog_array_map_clear_deferred
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:604 [inline]
check_cpu_stall kernel/rcu/tree_stall.h:688 [inline]
rcu_pending kernel/rcu/tree.c:3889 [inline]
rcu_sched_clock_irq.cold+0x9d/0x746 kernel/rcu/tree.c:2608
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:1428
__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:lock_acquire+0x1ef/0x510 kernel/locking/lockdep.c:5605
Code: ec a5 7e 83 f8 01 0f 85 b4 02 00 00 9c 58 f6 c4 02 0f 85 9f 02 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: 0000:ffffc90001b7f9f0 EFLAGS: 00000206
RAX: dffffc0000000000 RBX: 1ffff9200036ff40 RCX: ffffffff815c3adf
RDX: 1ffff11002fdc4ec RSI: 0000000000000001 RDI: 0000000000000000
RBP: 0000000000000001 R08: 0000000000000000 R09: ffffffff8ff44b77
R10: fffffbfff1fe896e R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: ffff8880a06de488 R15: 0000000000000000
__mutex_lock_common kernel/locking/mutex.c:599 [inline]
__mutex_lock+0x12f/0x12f0 kernel/locking/mutex.c:732
fd_array_map_delete_elem+0x120/0x2e0 kernel/bpf/arraymap.c:821
bpf_fd_array_map_clear kernel/bpf/arraymap.c:871 [inline]
prog_array_map_clear_deferred+0x10b/0x1b0 kernel/bpf/arraymap.c:1050
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
----------------
Code disassembly (best guess):
0: b8 00 00 00 00 mov $0x0,%eax
5: 00 fc add %bh,%ah
7: ff (bad)
8: df 48 c1 fisttps -0x3f(%rax)
b: ea (bad)
c: 03 0f add (%rdi),%ecx
e: b6 14 mov $0x14,%dh
10: 02 48 c7 add -0x39(%rax),%cl
13: c0 a8 06 90 8d 83 e0 shrb $0xe0,-0x7c726ffa(%rax)
1a: 07 (bad)
1b: 83 c0 03 add $0x3,%eax
1e: 38 d0 cmp %dl,%al
20: 7c 08 jl 0x2a
22: 84 d2 test %dl,%dl
24: 0f 85 90 45 00 00 jne 0x45ba
* 2a: 8b 05 9a d6 33 0c mov 0xc33d69a(%rip),%eax # 0xc33d6ca <-- trapping instruction
30: 85 c0 test %eax,%eax
32: 0f 85 a3 00 00 00 jne 0xdb
38: 8b 44 24 18 mov 0x18(%rsp),%eax
3c: 85 c0 test %eax,%eax
3e: 0f .byte 0xf
3f: 85 .byte 0x85