rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 1-...!: (10501 ticks this GP) idle=f25/1/0x4000000000000000 softirq=6379/6379 fqs=0
(t=10502 jiffies g=6405 q=1294)
rcu: rcu_preempt kthread starved for 10503 jiffies! g6405 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:28688 pid: 14 ppid: 2 flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:4972 [inline]
__schedule+0xa9a/0x4940 kernel/sched/core.c:6253
schedule+0xd2/0x260 kernel/sched/core.c:6326
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:
NMI backtrace for cpu 1
CPU: 1 PID: 19 Comm: ksoftirqd/1 Not tainted 5.16.0-rc6-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:111
nmi_trigger_cpumask_backtrace+0x1b3/0x230 lib/nmi_backtrace.c:62
trigger_single_cpu_backtrace include/linux/nmi.h:164 [inline]
rcu_check_gp_kthread_starvation.cold+0x1fb/0x200 kernel/rcu/tree_stall.h:481
print_cpu_stall kernel/rcu/tree_stall.h:625 [inline]
check_cpu_stall kernel/rcu/tree_stall.h:711 [inline]
rcu_pending kernel/rcu/tree.c:3878 [inline]
rcu_sched_clock_irq.cold+0x98/0x746 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: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:fq_pie_timer+0x17f/0x2a0 net/sched/sch_fq_pie.c:382
Code: 03 38 d0 7c 08 84 d2 0f 85 d3 00 00 00 8b 56 44 4c 89 ff 83 c3 01 e8 10 b5 ff ff 48 8b 44 24 08 42 0f b6 04 20 41 38 c5 7c 08 <84> c0 0f 85 d1 00 00 00 44 8b 75 d4 89 de 44 89 f7 e8 ab bf 18 fa
RSP: 0018:ffffc90000d97bb8 EFLAGS: 00000202
RAX: 0000000000000000 RBX: 0000000000000183 RCX: 0000000000000100
RDX: ffff888011975700 RSI: ffffffff875ee570 RDI: 0000000000000003
RBP: ffff888077045350 R08: 0000000000000000 R09: 0000000000000000
R10: ffffffff875e9e85 R11: 0000000000000000 R12: dffffc0000000000
R13: 0000000000000007 R14: 0000000000000400 R15: ffff888077045300
call_timer_fn+0x1a5/0x6b0 kernel/time/timer.c:1421
expire_timers kernel/time/timer.c:1466 [inline]
__run_timers.part.0+0x675/0xa20 kernel/time/timer.c:1734
__run_timers kernel/time/timer.c:1715 [inline]
run_timer_softirq+0xb3/0x1d0 kernel/time/timer.c:1747
__do_softirq+0x29b/0x9c2 kernel/softirq.c:558
run_ksoftirqd kernel/softirq.c:921 [inline]
run_ksoftirqd+0x2d/0x60 kernel/softirq.c:913
smpboot_thread_fn+0x645/0x9c0 kernel/smpboot.c:164
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: 19 Comm: ksoftirqd/1 Not tainted 5.16.0-rc6-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:111
nmi_trigger_cpumask_backtrace+0x1b3/0x230 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: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:fq_pie_timer+0x17f/0x2a0 net/sched/sch_fq_pie.c:382
Code: 03 38 d0 7c 08 84 d2 0f 85 d3 00 00 00 8b 56 44 4c 89 ff 83 c3 01 e8 10 b5 ff ff 48 8b 44 24 08 42 0f b6 04 20 41 38 c5 7c 08 <84> c0 0f 85 d1 00 00 00 44 8b 75 d4 89 de 44 89 f7 e8 ab bf 18 fa
RSP: 0018:ffffc90000d97bb8 EFLAGS: 00000202
RAX: 0000000000000000 RBX: 0000000000000183 RCX: 0000000000000100
RDX: ffff888011975700 RSI: ffffffff875ee570 RDI: 0000000000000003
RBP: ffff888077045350 R08: 0000000000000000 R09: 0000000000000000
R10: ffffffff875e9e85 R11: 0000000000000000 R12: dffffc0000000000
R13: 0000000000000007 R14: 0000000000000400 R15: ffff888077045300
call_timer_fn+0x1a5/0x6b0 kernel/time/timer.c:1421
expire_timers kernel/time/timer.c:1466 [inline]
__run_timers.part.0+0x675/0xa20 kernel/time/timer.c:1734
__run_timers kernel/time/timer.c:1715 [inline]
run_timer_softirq+0xb3/0x1d0 kernel/time/timer.c:1747
__do_softirq+0x29b/0x9c2 kernel/softirq.c:558
run_ksoftirqd kernel/softirq.c:921 [inline]
run_ksoftirqd+0x2d/0x60 kernel/softirq.c:913
smpboot_thread_fn+0x645/0x9c0 kernel/smpboot.c:164
kthread+0x405/0x4f0 kernel/kthread.c:327
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
----------------
Code disassembly (best guess):
0: 03 38 add (%rax),%edi
2: d0 7c 08 84 sarb -0x7c(%rax,%rcx,1)
6: d2 0f rorb %cl,(%rdi)
8: 85 d3 test %edx,%ebx
a: 00 00 add %al,(%rax)
c: 00 8b 56 44 4c 89 add %cl,-0x76b3bbaa(%rbx)
12: ff 83 c3 01 e8 10 incl 0x10e801c3(%rbx)
18: b5 ff mov $0xff,%ch
1a: ff 48 8b decl -0x75(%rax)
1d: 44 24 08 rex.R and $0x8,%al
20: 42 0f b6 04 20 movzbl (%rax,%r12,1),%eax
25: 41 38 c5 cmp %al,%r13b
28: 7c 08 jl 0x32
* 2a: 84 c0 test %al,%al <-- trapping instruction
2c: 0f 85 d1 00 00 00 jne 0x103
32: 44 8b 75 d4 mov -0x2c(%rbp),%r14d
36: 89 de mov %ebx,%esi
38: 44 89 f7 mov %r14d,%edi
3b: e8 ab bf 18 fa callq 0xfa18bfeb