rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 1-...!: (1 GPs behind) idle=dc0c/1/0x4000000000000000 softirq=5269/5270 fqs=2
(detected by 0, t=10502 jiffies, g=4105, q=277 ncpus=2)
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 3670 Comm: syz-execprog Not tainted 6.0.0-rc7-syzkaller-00081-gc3e0e1e23c70 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/22/2022
RIP: 0010:__lock_acquire+0x182/0x56d0 kernel/locking/lockdep.c:4956
Code: 48 c1 e9 03 0f b6 0c 11 48 c7 c2 c0 58 1b 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 08 45 bc 0f 76 08 85 c9 0f 84 f6 10 00 00 48 ba ab aa aa aa
RSP: 0018:ffffc900001f0ae8 EFLAGS: 00000097
RAX: ffffffff908e5d60 RBX: 1ffff9200003e18c RCX: 0000000000000004
RDX: 0000000000000003 RSI: 0000000000000001 RDI: ffffffff9140dd28
RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000001
R10: fffffbfff1bbdc8a R11: 0000000000000000 R12: 0000000000000000
R13: ffff88801f3e5880 R14: ffffffff9140dd20 R15: 0000000000000000
FS: 000000c00002e890(0000) GS:ffff8880b9b00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffa5eb0a218 CR3: 0000000012bba000 CR4: 0000000000350ee0
Call Trace:
lock_acquire kernel/locking/lockdep.c:5666 [inline]
lock_acquire+0x1ab/0x570 kernel/locking/lockdep.c:5631
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
_raw_spin_lock_irqsave+0x39/0x50 kernel/locking/spinlock.c:162
debug_object_deactivate lib/debugobjects.c:732 [inline]
debug_object_deactivate+0x101/0x300 lib/debugobjects.c:720
debug_hrtimer_deactivate kernel/time/hrtimer.c:425 [inline]
debug_deactivate kernel/time/hrtimer.c:481 [inline]
__run_hrtimer kernel/time/hrtimer.c:1653 [inline]
__hrtimer_run_queues+0x3f3/0xe40 kernel/time/hrtimer.c:1749
hrtimer_interrupt+0x31c/0x790 kernel/time/hrtimer.c:1811
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1095 [inline]
__sysvec_apic_timer_interrupt+0x146/0x530 arch/x86/kernel/apic/apic.c:1112
sysvec_apic_timer_interrupt+0x8e/0xc0 arch/x86/kernel/apic/apic.c:1106
asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:649
RIP: 0010:finish_task_switch.isra.0+0x2bf/0xc70 kernel/sched/core.c:5062
Code: 8b 3a 4c 89 e7 48 c7 02 00 00 00 00 ff d1 4d 85 ff 75 bf 4c 89 e7 e8 60 f8 ff ff e8 1b 44 2f 00 fb 65 48 8b 1c 25 80 6f 02 00 <48> 8d bb 98 15 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1
RSP: 0018:ffffc9000485f998 EFLAGS: 00000206
RAX: 0000000000004835 RBX: ffff88801f3e5880 RCX: 1ffffffff1bbd691
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc9000485f9e0 R08: 0000000000000001 R09: 0000000000000001
R10: ffffed10173673f0 R11: 0000000000000000 R12: ffff8880b9b39f80
R13: ffff88801bdf9d80 R14: 0000000000000000 R15: ffff8880b9b3a9b8
context_switch kernel/sched/core.c:5185 [inline]
__schedule+0xae7/0x52b0 kernel/sched/core.c:6494
schedule+0xda/0x1b0 kernel/sched/core.c:6570
schedule_hrtimeout_range_clock+0x195/0x390 kernel/time/hrtimer.c:2305
ep_poll fs/eventpoll.c:1878 [inline]
do_epoll_wait+0x12ba/0x1950 fs/eventpoll.c:2256
do_compat_epoll_pwait.part.0+0x29/0x1d0 fs/eventpoll.c:2290
do_epoll_pwait fs/eventpoll.c:2297 [inline]
__do_sys_epoll_pwait fs/eventpoll.c:2303 [inline]
__se_sys_epoll_pwait fs/eventpoll.c:2297 [inline]
__x64_sys_epoll_pwait+0x1cf/0x310 fs/eventpoll.c:2297
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+0x63/0xcd
RIP: 0033:0x463240
Code: 0f 05 89 44 24 20 c3 cc cc cc 8b 7c 24 08 48 8b 74 24 10 8b 54 24 18 44 8b 54 24 1c 49 c7 c0 00 00 00 00 b8 19 01 00 00 0f 05 <89> 44 24 20 c3 cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc
RSP: 002b:000000c0000397e8 EFLAGS: 00000246 ORIG_RAX: 0000000000000119
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000463240
RDX: 0000000000000080 RSI: 000000c000039840 RDI: 0000000000000003
RBP: 000000c000039e40 R08: 0000000000000000 R09: 0000000000000002
R10: 000000000000ea5f R11: 0000000000000246 R12: 000000c000039870
R13: 0000000000000000 R14: 000000c000001040 R15: 0000000000000000
rcu: rcu_preempt kthread starved for 10498 jiffies! g4105 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->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:R running task stack:28528 pid: 17 ppid: 2 flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:5182 [inline]
__schedule+0xadf/0x52b0 kernel/sched/core.c:6494
schedule+0xda/0x1b0 kernel/sched/core.c:6570
schedule_timeout+0x14a/0x2a0 kernel/time/timer.c:1935
rcu_gp_fqs_loop+0x190/0x910 kernel/rcu/tree.c:1657
rcu_gp_kthread+0x236/0x360 kernel/rcu/tree.c:1854
kthread+0x2e4/0x3a0 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:
NMI backtrace for cpu 0
CPU: 0 PID: 9 Comm: kworker/u4:0 Not tainted 6.0.0-rc7-syzkaller-00081-gc3e0e1e23c70 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/22/2022
Workqueue: events_unbound toggle_allocation_gate
Call Trace:
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106
nmi_cpu_backtrace.cold+0x46/0x14f lib/nmi_backtrace.c:111
nmi_trigger_cpumask_backtrace+0x206/0x250 lib/nmi_backtrace.c:62
trigger_single_cpu_backtrace include/linux/nmi.h:166 [inline]
rcu_check_gp_kthread_starvation.cold+0x1fb/0x200 kernel/rcu/tree_stall.h:514
print_other_cpu_stall kernel/rcu/tree_stall.h:619 [inline]
check_cpu_stall kernel/rcu/tree_stall.h:762 [inline]
rcu_pending kernel/rcu/tree.c:3660 [inline]
rcu_sched_clock_irq+0x2404/0x2530 kernel/rcu/tree.c:2342
update_process_times+0x11a/0x1a0 kernel/time/timer.c:1839
tick_sched_handle+0x9b/0x180 kernel/time/tick-sched.c:243
tick_sched_timer+0xee/0x120 kernel/time/tick-sched.c:1480
__run_hrtimer kernel/time/hrtimer.c:1685 [inline]
__hrtimer_run_queues+0x1c0/0xe40 kernel/time/hrtimer.c:1749
hrtimer_interrupt+0x31c/0x790 kernel/time/hrtimer.c:1811
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1095 [inline]
__sysvec_apic_timer_interrupt+0x146/0x530 arch/x86/kernel/apic/apic.c:1112
sysvec_apic_timer_interrupt+0x8e/0xc0 arch/x86/kernel/apic/apic.c:1106
asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:649
RIP: 0010:csd_lock_wait kernel/smp.c:414 [inline]
RIP: 0010:smp_call_function_many_cond+0x5c3/0x1430 kernel/smp.c:988
Code: 89 ee e8 90 ad 0a 00 85 ed 74 48 48 8b 44 24 08 49 89 c4 83 e0 07 49 c1 ec 03 48 89 c5 4d 01 f4 83 c5 03 e8 af b0 0a 00 f3 90 <41> 0f b6 04 24 40 38 c5 7c 08 84 c0 0f 85 b5 0b 00 00 8b 43 08 31
RSP: 0018:ffffc900000e7948 EFLAGS: 00000293
RAX: 0000000000000000 RBX: ffff8880b9b3edc0 RCX: 0000000000000000
RDX: ffff888011ad8000 RSI: ffffffff81715771 RDI: 0000000000000005
RBP: 0000000000000003 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000000 R12: ffffed1017367db9
R13: 0000000000000001 R14: dffffc0000000000 R15: 0000000000000001
on_each_cpu_cond_mask+0x56/0xa0 kernel/smp.c:1154
on_each_cpu include/linux/smp.h:71 [inline]
text_poke_sync arch/x86/kernel/alternative.c:1302 [inline]
text_poke_bp_batch+0x233/0x6c0 arch/x86/kernel/alternative.c:1490
text_poke_flush arch/x86/kernel/alternative.c:1660 [inline]
text_poke_flush arch/x86/kernel/alternative.c:1657 [inline]
text_poke_finish+0x16/0x30 arch/x86/kernel/alternative.c:1667
arch_jump_label_transform_apply+0x13/0x20 arch/x86/kernel/jump_label.c:146
jump_label_update+0x32f/0x410 kernel/jump_label.c:801
static_key_enable_cpuslocked+0x1b1/0x260 kernel/jump_label.c:177
static_key_enable+0x16/0x20 kernel/jump_label.c:190
toggle_allocation_gate mm/kfence/core.c:811 [inline]
toggle_allocation_gate+0x100/0x390 mm/kfence/core.c:803
process_one_work+0x991/0x1610 kernel/workqueue.c:2289
worker_thread+0x665/0x1080 kernel/workqueue.c:2436
kthread+0x2e4/0x3a0 kernel/kthread.c:376
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306