rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 1-...!: (1 GPs behind) idle=7ab/1/0x4000000000000000 softirq=28842/28843 fqs=3
(detected by 0, t=10502 jiffies, g=47653, q=65)
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 6592 Comm: syz-executor.4 Not tainted 5.15.0-rc1-next-20210917-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:__this_cpu_preempt_check+0x0/0x20 lib/smp_processor_id.c:65
Code: 1a be ff e8 8b ed cc ff eb a2 0f 1f 44 00 00 48 c7 c6 40 40 e4 89 48 c7 c7 80 40 e4 89 e9 a8 fe ff ff 0f 1f 84 00 00 00 00 00 <55> 48 89 fd 0f 1f 44 00 00 48 89 ee 5d 48 c7 c7 c0 40 e4 89 e9 87
RSP: 0018:ffffc90000dc0c88 EFLAGS: 00000046
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000001
RDX: 0000000000000000 RSI: 00000000ffffffff RDI: ffffffff898bfd60
RBP: ffffffff8b9803a0 R08: 0000000000000000 R09: ffff8880b9d32a0b
R10: ffffed10173a6541 R11: 0000000000000000 R12: ffff888020798000
R13: 00000000ffffffff R14: 00000000ffffffff R15: 0000000000000000
FS: 00005555559a4400(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f8e32013e03 CR3: 000000003e440000 CR4: 00000000001506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
lockdep_recursion_inc kernel/locking/lockdep.c:433 [inline]
lock_is_held_type+0x63/0x140 kernel/locking/lockdep.c:5667
lock_is_held include/linux/lockdep.h:283 [inline]
rcu_read_lock_sched_held+0x3a/0x70 kernel/rcu/update.c:125
trace_lock_acquire include/trace/events/lock.h:13 [inline]
lock_acquire+0x442/0x510 kernel/locking/lockdep.c:5596
rcu_lock_acquire include/linux/rcupdate.h:268 [inline]
rcu_read_lock include/linux/rcupdate.h:694 [inline]
advance_sched+0x4a5/0x9a0 net/sched/sch_taprio.c:763
__run_hrtimer kernel/time/hrtimer.c:1685 [inline]
__hrtimer_run_queues+0x609/0xe50 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_is_held_type+0xfd/0x140 kernel/locking/lockdep.c:5673
Code: 00 00 b8 ff ff ff ff 65 0f c1 05 fe 8d ce 76 83 f8 01 75 29 9c 58 f6 c4 02 75 3d 48 f7 04 24 00 02 00 00 74 01 fb 48 83 c4 08 <44> 89 e8 5b 5d 41 5c 41 5d 41 5e 41 5f c3 45 31 ed eb b9 0f 0b 48
RSP: 0018:ffffc90002eafcc0 EFLAGS: 00000296
RAX: 0000000000000046 RBX: 0000000000000000 RCX: 0000000000000001
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffffff8b9803a0 R08: 0000000000000000 R09: ffff8880b9d32a0b
R10: ffffed10173a6541 R11: 0000000000000000 R12: ffff888020798000
R13: 0000000000000000 R14: 00000000ffffffff R15: ffff888017680a48
lock_is_held include/linux/lockdep.h:283 [inline]
rcu_read_lock_sched_held+0x3a/0x70 kernel/rcu/update.c:125
trace_kmem_cache_free include/trace/events/kmem.h:138 [inline]
kmem_cache_free+0x236/0x5d0 mm/slub.c:3509
putname fs/namei.c:270 [inline]
putname+0xfe/0x140 fs/namei.c:256
do_sys_openat2+0x153/0x4d0 fs/open.c:1209
do_sys_open fs/open.c:1216 [inline]
__do_sys_openat fs/open.c:1232 [inline]
__se_sys_openat fs/open.c:1227 [inline]
__x64_sys_openat+0x13f/0x1f0 fs/open.c:1227
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: 0033:0x7f62c3163824
Code: 84 00 00 00 00 00 44 89 54 24 0c e8 96 f9 ff ff 44 8b 54 24 0c 44 89 e2 48 89 ee 41 89 c0 bf 9c ff ff ff b8 01 01 00 00 0f 05 <48> 3d 00 f0 ff ff 77 34 44 89 c7 89 44 24 0c e8 c8 f9 ff ff 8b 44
RSP: 002b:00007fff9dee2fd0 EFLAGS: 00000293 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007fff9dee30e0 RCX: 00007f62c3163824
RDX: 0000000000000002 RSI: 00007fff9dee3120 RDI: 00000000ffffff9c
RBP: 00007fff9dee3120 R08: 0000000000000000 R09: 00007fff9dee2ee0
R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000002
R13: 00000000000642ce R14: 0000000000000000 R15: 00007fff9dee3120
rcu: rcu_preempt kthread starved for 10496 jiffies! g47653 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:28696 pid: 14 ppid: 2 flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:4955 [inline]
__schedule+0x940/0x26f0 kernel/sched/core.c:6236
schedule+0xd3/0x270 kernel/sched/core.c:6315
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+0x3e5/0x4d0 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 0
CPU: 0 PID: 2579 Comm: kworker/u4:7 Not tainted 5.15.0-rc1-next-20210917-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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+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_check_gp_kthread_starvation.cold+0x1fb/0x200 kernel/rcu/tree_stall.h:481
print_other_cpu_stall kernel/rcu/tree_stall.h:586 [inline]
check_cpu_stall kernel/rcu/tree_stall.h:729 [inline]
rcu_pending kernel/rcu/tree.c:3878 [inline]
rcu_sched_clock_irq+0x2125/0x2200 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:check_kcov_mode+0x7/0x40 kernel/kcov.c:163
Code: 00 e9 59 fe ff ff 48 8b 7c 24 08 e8 b3 3d 46 00 e9 61 fd ff ff cc cc cc cc cc cc cc cc cc cc cc cc cc cc 65 8b 05 e9 e9 8b 7e <89> c2 81 e2 00 01 00 00 a9 00 01 ff 00 74 10 31 c0 85 d2 74 15 8b
RSP: 0018:ffffc9000b51f9e8 EFLAGS: 00000202
RAX: 0000000000000001 RBX: ffff8880b9d367c0 RCX: 0000000000000001
RDX: ffff888024d5b900 RSI: ffff888024d5b900 RDI: 0000000000000003
RBP: 0000000000000003 R08: 0000000000000000 R09: 0000000000000001
R10: ffffffff816aca76 R11: 0000000000000000 R12: ffffed10173a6cf9
R13: 0000000000000001 R14: ffff8880b9d367c8 R15: 0000000000000001
write_comp_data kernel/kcov.c:218 [inline]
__sanitizer_cov_trace_const_cmp4+0x1c/0x70 kernel/kcov.c:284
csd_lock_wait kernel/smp.c:440 [inline]
smp_call_function_many_cond+0x476/0xc20 kernel/smp.c:969
on_each_cpu_cond_mask+0x56/0xa0 kernel/smp.c:1135
on_each_cpu include/linux/smp.h:71 [inline]
text_poke_sync arch/x86/kernel/alternative.c:929 [inline]
text_poke_bp_batch+0x1b3/0x560 arch/x86/kernel/alternative.c:1114
text_poke_flush arch/x86/kernel/alternative.c:1268 [inline]
text_poke_flush arch/x86/kernel/alternative.c:1265 [inline]
text_poke_finish+0x16/0x30 arch/x86/kernel/alternative.c:1275
arch_jump_label_transform_apply+0x13/0x20 arch/x86/kernel/jump_label.c:146
jump_label_update+0x1d5/0x430 kernel/jump_label.c:830
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:626 [inline]
toggle_allocation_gate+0x100/0x390 mm/kfence/core.c:618
process_one_work+0x9b2/0x1690 kernel/workqueue.c:2297
worker_thread+0x658/0x11f0 kernel/workqueue.c:2444
kthread+0x3e5/0x4d0 kernel/kthread.c:319
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
----------------
Code disassembly (best guess), 3 bytes skipped:
0: e8 8b ed cc ff callq 0xffcced90
5: eb a2 jmp 0xffffffa9
7: 0f 1f 44 00 00 nopl 0x0(%rax,%rax,1)
c: 48 c7 c6 40 40 e4 89 mov $0xffffffff89e44040,%rsi
13: 48 c7 c7 80 40 e4 89 mov $0xffffffff89e44080,%rdi
1a: e9 a8 fe ff ff jmpq 0xfffffec7
1f: 0f 1f 84 00 00 00 00 nopl 0x0(%rax,%rax,1)
26: 00
* 27: 55 push %rbp <-- trapping instruction
28: 48 89 fd mov %rdi,%rbp
2b: 0f 1f 44 00 00 nopl 0x0(%rax,%rax,1)
30: 48 89 ee mov %rbp,%rsi
33: 5d pop %rbp
34: 48 c7 c7 c0 40 e4 89 mov $0xffffffff89e440c0,%rdi
3b: e9 .byte 0xe9
3c: 87 .byte 0x87