rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 1-...!: (10388 ticks this GP) idle=9e2/1/0x4000000000000000 softirq=80937/80940 fqs=4
(t=10501 jiffies g=49401 q=259)
rcu: rcu_preempt kthread starved for 10494 jiffies! g49401 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:29304 pid: 13 ppid: 2 flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:4681 [inline]
__schedule+0x902/0x26a0 kernel/sched/core.c:5938
schedule+0xd3/0x270 kernel/sched/core.c:6017
schedule_timeout+0x11d/0x250 kernel/time/timer.c:1881
rcu_gp_fqs_loop kernel/rcu/tree.c:1996 [inline]
rcu_gp_kthread+0xd34/0x1980 kernel/rcu/tree.c:2169
kthread+0x38b/0x460 kernel/kthread.c:319
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: 22894 Comm: syz-executor447 Not tainted 5.14.0-rc7-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+0x45/0x59 lib/dump_stack.c:105
nmi_cpu_backtrace.cold+0x30/0x99 lib/nmi_backtrace.c:105
nmi_trigger_cpumask_backtrace+0x11f/0x170 lib/nmi_backtrace.c:62
trigger_single_cpu_backtrace include/linux/nmi.h:164 [inline]
rcu_check_gp_kthread_starvation.cold+0x1d1/0x1d6 kernel/rcu/tree_stall.h:479
print_cpu_stall kernel/rcu/tree_stall.h:623 [inline]
check_cpu_stall kernel/rcu/tree_stall.h:700 [inline]
rcu_pending kernel/rcu/tree.c:3922 [inline]
rcu_sched_clock_irq.cold+0x9a/0x747 kernel/rcu/tree.c:2641
update_process_times+0x13b/0x1c0 kernel/time/timer.c:1785
tick_sched_handle+0x6f/0x130 kernel/time/tick-sched.c:226
tick_sched_timer+0x132/0x210 kernel/time/tick-sched.c:1421
__run_hrtimer kernel/time/hrtimer.c:1537 [inline]
__hrtimer_run_queues+0x18a/0xb00 kernel/time/hrtimer.c:1601
hrtimer_interrupt+0x2f9/0x920 kernel/time/hrtimer.c:1663
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1089 [inline]
__sysvec_apic_timer_interrupt+0x146/0x530 arch/x86/kernel/apic/apic.c:1106
sysvec_apic_timer_interrupt+0x40/0xc0 arch/x86/kernel/apic/apic.c:1100
asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:638
RIP: 0010:pv_wait_head_or_lock kernel/locking/qspinlock_paravirt.h:434 [inline]
RIP: 0010:__pv_queued_spin_lock_slowpath+0x3ba/0xb40 kernel/locking/qspinlock.c:508
Code: eb c6 45 01 01 41 bc 00 80 00 00 48 c1 e9 03 83 e3 07 41 be 01 00 00 00 48 b8 00 00 00 00 00 fc ff df 4c 8d 2c 01 eb 0c f3 90 <41> 83 ec 01 0f 84 72 04 00 00 41 0f b6 45 00 38 d8 7f 08 84 c0 0f
RSP: 0018:ffffc90000db0a48 EFLAGS: 00000202
RAX: 0000000000000001 RBX: 0000000000000000 RCX: 1ffffffff16dcaa8
RDX: 0000000000000001 RSI: dffffc0000000000 RDI: ffffffff8b6e5542
RBP: ffffffff8b6e5540 R08: 0000000000000001 R09: ffffffff8b6e5543
R10: fffffbfff16dcaa8 R11: ffff888041c732d8 R12: 0000000000007e65
R13: fffffbfff16dcaa8 R14: 0000000000000001 R15: ffff8880ba1368c0
pv_queued_spin_lock_slowpath arch/x86/include/asm/paravirt.h:585 [inline]
queued_spin_lock_slowpath arch/x86/include/asm/qspinlock.h:51 [inline]
queued_spin_lock include/asm-generic/qspinlock.h:85 [inline]
do_raw_spin_lock+0x200/0x2b0 kernel/locking/spinlock_debug.c:113
spin_lock include/linux/spinlock.h:354 [inline]
mac80211_hwsim_tx_frame_no_nl.isra.0+0x5ac/0x1020 drivers/net/wireless/mac80211_hwsim.c:1516
mac80211_hwsim_tx_frame+0x1a0/0x250 drivers/net/wireless/mac80211_hwsim.c:1784
mac80211_hwsim_beacon_tx+0x3eb/0x7b0 drivers/net/wireless/mac80211_hwsim.c:1838
__iterate_interfaces+0x103/0x360 net/mac80211/util.c:793
ieee80211_iterate_active_interfaces_atomic+0x53/0xf0 net/mac80211/util.c:829
mac80211_hwsim_beacon+0xb7/0x160 drivers/net/wireless/mac80211_hwsim.c:1861
__run_hrtimer kernel/time/hrtimer.c:1537 [inline]
__hrtimer_run_queues+0x4d7/0xb00 kernel/time/hrtimer.c:1601
hrtimer_run_softirq+0x176/0x340 kernel/time/hrtimer.c:1618
__do_softirq+0x29b/0x9c2 kernel/softirq.c:558
invoke_softirq kernel/softirq.c:432 [inline]
__irq_exit_rcu+0x16e/0x1c0 kernel/softirq.c:636
irq_exit_rcu+0x5/0x20 kernel/softirq.c:648
sysvec_apic_timer_interrupt+0x93/0xc0 arch/x86/kernel/apic/apic.c:1100
asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:638
RIP: 0010:queue_work_on+0x45/0x70 kernel/workqueue.c:1531
Code: 75 33 be 08 00 00 00 4c 89 e7 e8 56 92 62 00 f0 49 0f ba 2c 24 00 41 be 00 00 00 00 73 1e 48 85 db 74 06 e8 3d 1f 2b 00 fb 5b <44> 89 f0 5d 41 5c 41 5d 41 5e c3 e8 bb 1b 2b 00 eb c6 4c 89 e2 4c
RSP: 0018:ffffc900028afcc8 EFLAGS: 00000202
RAX: 00000000000004c1 RBX: ffff88801b12c680 RCX: 1ffffffff18b5d89
RDX: 0000000000000000 RSI: ffffffff88ab23a0 RDI: ffffffff88fd1480
RBP: 0000000000000008 R08: 0000000000000001 R09: 0000000000000001
R10: 0000000000000001 R11: 000000000000b681 R12: ffff8880ba131448
R13: ffff88800f064c00 R14: 0000000000000001 R15: 0000000000000040
free_thread_stack kernel/fork.c:292 [inline]
release_task_stack kernel/fork.c:432 [inline]
put_task_stack+0x248/0x440 kernel/fork.c:443
finish_task_switch.isra.0+0x717/0x9e0 kernel/sched/core.c:4593
context_switch kernel/sched/core.c:4684 [inline]
__schedule+0x90a/0x26a0 kernel/sched/core.c:5938
preempt_schedule_irq+0x4e/0x90 kernel/sched/core.c:6326
irqentry_exit+0x31/0x80 kernel/entry/common.c:427
asm_sysvec_irq_work+0x12/0x20 arch/x86/include/asm/idtentry.h:664
RIP: 0010:exit_to_user_mode_loop kernel/entry/common.c:162 [inline]
RIP: 0010:exit_to_user_mode_prepare+0x143/0x290 kernel/entry/common.c:209
Code: 14 01 00 00 e8 be 5f fd 06 65 48 8b 04 25 40 f0 01 00 48 8b 18 f7 c3 0e 30 02 00 0f 84 03 ff ff ff e8 31 96 14 00 fb f6 c3 08 <74> ba e8 96 92 fe 06 f6 c7 10 74 b5 48 89 ef e8 09 64 2e 00 f7 c3
RSP: 0000:ffffc900028aff30 EFLAGS: 00000202
RAX: 0000000000000249 RBX: 0000000000000008 RCX: 1ffffffff18b5d89
RDX: 0000000000000000 RSI: ffffffff88ab23a0 RDI: ffffffff88fd1480
RBP: ffffc900028aff58 R08: 0000000000000001 R09: 0000000000000001
R10: ffffffff8dd78017 R11: 0000000000000001 R12: ffff888027578000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
irqentry_exit_to_user_mode+0x5/0x30 kernel/entry/common.c:315
asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:638
RIP: 0033:0x4419f9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 41 15 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 c0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fff6d409e48 EFLAGS: 00000246
RAX: 0000000000000000 RBX: 0000000000000003 RCX: 00000000004419f9
RDX: 0000000000042000 RSI: 0000000000000004 RDI: 0000000000000003
RBP: 0000000000000000 R08: 0000000000000031 R09: 0000000000000031
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000006571f
R13: 00007fff6d409ea0 R14: 00007fff6d409e90 R15: 00007fff6d409e64
NMI backtrace for cpu 1
CPU: 1 PID: 22894 Comm: syz-executor447 Not tainted 5.14.0-rc7-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+0x45/0x59 lib/dump_stack.c:105
nmi_cpu_backtrace.cold+0x30/0x99 lib/nmi_backtrace.c:105
nmi_trigger_cpumask_backtrace+0x11f/0x170 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:342
print_cpu_stall kernel/rcu/tree_stall.h:625 [inline]
check_cpu_stall kernel/rcu/tree_stall.h:700 [inline]
rcu_pending kernel/rcu/tree.c:3922 [inline]
rcu_sched_clock_irq.cold+0x9f/0x747 kernel/rcu/tree.c:2641
update_process_times+0x13b/0x1c0 kernel/time/timer.c:1785
tick_sched_handle+0x6f/0x130 kernel/time/tick-sched.c:226
tick_sched_timer+0x132/0x210 kernel/time/tick-sched.c:1421
__run_hrtimer kernel/time/hrtimer.c:1537 [inline]
__hrtimer_run_queues+0x18a/0xb00 kernel/time/hrtimer.c:1601
hrtimer_interrupt+0x2f9/0x920 kernel/time/hrtimer.c:1663
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1089 [inline]
__sysvec_apic_timer_interrupt+0x146/0x530 arch/x86/kernel/apic/apic.c:1106
sysvec_apic_timer_interrupt+0x40/0xc0 arch/x86/kernel/apic/apic.c:1100
asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:638
RIP: 0010:pv_wait_head_or_lock kernel/locking/qspinlock_paravirt.h:434 [inline]
RIP: 0010:__pv_queued_spin_lock_slowpath+0x3ba/0xb40 kernel/locking/qspinlock.c:508
Code: eb c6 45 01 01 41 bc 00 80 00 00 48 c1 e9 03 83 e3 07 41 be 01 00 00 00 48 b8 00 00 00 00 00 fc ff df 4c 8d 2c 01 eb 0c f3 90 <41> 83 ec 01 0f 84 72 04 00 00 41 0f b6 45 00 38 d8 7f 08 84 c0 0f
RSP: 0018:ffffc90000db0a48 EFLAGS: 00000202
RAX: 0000000000000001 RBX: 0000000000000000 RCX: 1ffffffff16dcaa8
RDX: 0000000000000001 RSI: dffffc0000000000 RDI: ffffffff8b6e5542
RBP: ffffffff8b6e5540 R08: 0000000000000001 R09: ffffffff8b6e5543
R10: fffffbfff16dcaa8 R11: ffff888041c732d8 R12: 0000000000007e65
R13: fffffbfff16dcaa8 R14: 0000000000000001 R15: ffff8880ba1368c0
pv_queued_spin_lock_slowpath arch/x86/include/asm/paravirt.h:585 [inline]
queued_spin_lock_slowpath arch/x86/include/asm/qspinlock.h:51 [inline]
queued_spin_lock include/asm-generic/qspinlock.h:85 [inline]
do_raw_spin_lock+0x200/0x2b0 kernel/locking/spinlock_debug.c:113
spin_lock include/linux/spinlock.h:354 [inline]
mac80211_hwsim_tx_frame_no_nl.isra.0+0x5ac/0x1020 drivers/net/wireless/mac80211_hwsim.c:1516
mac80211_hwsim_tx_frame+0x1a0/0x250 drivers/net/wireless/mac80211_hwsim.c:1784
mac80211_hwsim_beacon_tx+0x3eb/0x7b0 drivers/net/wireless/mac80211_hwsim.c:1838
__iterate_interfaces+0x103/0x360 net/mac80211/util.c:793
ieee80211_iterate_active_interfaces_atomic+0x53/0xf0 net/mac80211/util.c:829
mac80211_hwsim_beacon+0xb7/0x160 drivers/net/wireless/mac80211_hwsim.c:1861
__run_hrtimer kernel/time/hrtimer.c:1537 [inline]
__hrtimer_run_queues+0x4d7/0xb00 kernel/time/hrtimer.c:1601
hrtimer_run_softirq+0x176/0x340 kernel/time/hrtimer.c:1618
__do_softirq+0x29b/0x9c2 kernel/softirq.c:558
invoke_softirq kernel/softirq.c:432 [inline]
__irq_exit_rcu+0x16e/0x1c0 kernel/softirq.c:636
irq_exit_rcu+0x5/0x20 kernel/softirq.c:648
sysvec_apic_timer_interrupt+0x93/0xc0 arch/x86/kernel/apic/apic.c:1100
asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:638
RIP: 0010:queue_work_on+0x45/0x70 kernel/workqueue.c:1531
Code: 75 33 be 08 00 00 00 4c 89 e7 e8 56 92 62 00 f0 49 0f ba 2c 24 00 41 be 00 00 00 00 73 1e 48 85 db 74 06 e8 3d 1f 2b 00 fb 5b <44> 89 f0 5d 41 5c 41 5d 41 5e c3 e8 bb 1b 2b 00 eb c6 4c 89 e2 4c
RSP: 0018:ffffc900028afcc8 EFLAGS: 00000202
RAX: 00000000000004c1 RBX: ffff88801b12c680 RCX: 1ffffffff18b5d89
RDX: 0000000000000000 RSI: ffffffff88ab23a0 RDI: ffffffff88fd1480
RBP: 0000000000000008 R08: 0000000000000001 R09: 0000000000000001
R10: 0000000000000001 R11: 000000000000b681 R12: ffff8880ba131448
R13: ffff88800f064c00 R14: 0000000000000001 R15: 0000000000000040
free_thread_stack kernel/fork.c:292 [inline]
release_task_stack kernel/fork.c:432 [inline]
put_task_stack+0x248/0x440 kernel/fork.c:443
finish_task_switch.isra.0+0x717/0x9e0 kernel/sched/core.c:4593
context_switch kernel/sched/core.c:4684 [inline]
__schedule+0x90a/0x26a0 kernel/sched/core.c:5938
preempt_schedule_irq+0x4e/0x90 kernel/sched/core.c:6326
irqentry_exit+0x31/0x80 kernel/entry/common.c:427
asm_sysvec_irq_work+0x12/0x20 arch/x86/include/asm/idtentry.h:664
RIP: 0010:exit_to_user_mode_loop kernel/entry/common.c:162 [inline]
RIP: 0010:exit_to_user_mode_prepare+0x143/0x290 kernel/entry/common.c:209
Code: 14 01 00 00 e8 be 5f fd 06 65 48 8b 04 25 40 f0 01 00 48 8b 18 f7 c3 0e 30 02 00 0f 84 03 ff ff ff e8 31 96 14 00 fb f6 c3 08 <74> ba e8 96 92 fe 06 f6 c7 10 74 b5 48 89 ef e8 09 64 2e 00 f7 c3
RSP: 0000:ffffc900028aff30 EFLAGS: 00000202
RAX: 0000000000000249 RBX: 0000000000000008 RCX: 1ffffffff18b5d89
RDX: 0000000000000000 RSI: ffffffff88ab23a0 RDI: ffffffff88fd1480
RBP: ffffc900028aff58 R08: 0000000000000001 R09: 0000000000000001
R10: ffffffff8dd78017 R11: 0000000000000001 R12: ffff888027578000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
irqentry_exit_to_user_mode+0x5/0x30 kernel/entry/common.c:315
asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:638
RIP: 0033:0x4419f9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 41 15 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 c0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fff6d409e48 EFLAGS: 00000246
RAX: 0000000000000000 RBX: 0000000000000003 RCX: 00000000004419f9
RDX: 0000000000042000 RSI: 0000000000000004 RDI: 0000000000000003
RBP: 0000000000000000 R08: 0000000000000031 R09: 0000000000000031
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000006571f
R13: 00007fff6d409ea0 R14: 00007fff6d409e90 R15: 00007fff6d409e64
----------------
Code disassembly (best guess):
0: eb c6 jmp 0xffffffc8
2: 45 01 01 add %r8d,(%r9)
5: 41 bc 00 80 00 00 mov $0x8000,%r12d
b: 48 c1 e9 03 shr $0x3,%rcx
f: 83 e3 07 and $0x7,%ebx
12: 41 be 01 00 00 00 mov $0x1,%r14d
18: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax
1f: fc ff df
22: 4c 8d 2c 01 lea (%rcx,%rax,1),%r13
26: eb 0c jmp 0x34
28: f3 90 pause
* 2a: 41 83 ec 01 sub $0x1,%r12d <-- trapping instruction
2e: 0f 84 72 04 00 00 je 0x4a6
34: 41 0f b6 45 00 movzbl 0x0(%r13),%eax
39: 38 d8 cmp %bl,%al
3b: 7f 08 jg 0x45
3d: 84 c0 test %al,%al
3f: 0f .byte 0xf