rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	0-...!: (0 ticks this GP) idle=9c64/1/0x4000000000000000 softirq=30491/30491 fqs=4
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P5294/1:b..l
rcu: 	(detected by 1, t=10502 jiffies, g=22989, q=298 ncpus=2)
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 8819 Comm: syz.4.827 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
RIP: 0010:kasan_check_range+0x297/0x2c0
Code: 49 83 c3 04 eb 10 4d 01 f3 49 83 c3 05 eb 07 4d 01 f3 49 83 c3 06 4d 89 dc 4d 85 db 0f 84 44 ff ff ff 4d 01 d1 4d 39 cc 75 11 <41> 83 e0 07 45 0f be 09 45 39 c8 0f 8c 2b ff ff ff 0f b6 d2 e8 a0
RSP: 0018:ffffc90000007788 EFLAGS: 00000046
RAX: 00000000ffffff01 RBX: ffffffffffffffff RCX: ffffffff819e14b1
RDX: 0000000000000001 RSI: 0000000000000004 RDI: ffffc90000007800
RBP: ffffc90000007870 R08: ffffc90000007803 R09: fffff52000000f00
R10: dffffc0000000000 R11: fffff52000000f00 R12: fffff52000000f00
R13: ffff88804b027a88 R14: fffff52000000f01 R15: 1ffff92000000f00
FS:  00007fa6699936c0(0000) GS:ffff8880b8615000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 00000001161ba000 CR4: 00000000000006f0
DR0: 0000000000000000 DR1: 0000200000000300 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 do_raw_spin_lock+0x121/0x290
 _raw_spin_lock_irqsave+0xb3/0xf0
 hrtimer_try_to_cancel+0x22b/0x420
 hrtimer_cancel+0x3b/0x50
 cpu_clock_event_stop+0xd9/0x130
 __perf_event_overflow+0x580/0xe40
 perf_swevent_hrtimer+0x3c5/0x550
 __hrtimer_run_queues+0x4e0/0xc60
 hrtimer_interrupt+0x45b/0xaa0
 __sysvec_apic_timer_interrupt+0x10b/0x410
 sysvec_apic_timer_interrupt+0xa1/0xc0
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:x64_sys_call+0x1e/0x2200
Code: 90 90 90 90 90 90 90 90 90 90 90 90 66 0f 1f 00 81 fe eb 00 00 00 7f 56 83 fe 75 0f 8f be 00 00 00 83 fe 3a 0f 8f 7f 01 00 00 <83> fe 1c 0f 8e c5 02 00 00 83 fe 2b 0f 8f 00 05 00 00 83 fe 23 0f
RSP: 0018:ffffc90007137ee8 EFLAGS: 00000293
RAX: 557d3e9f2a8c8c00 RBX: ffffc90007137ef0 RCX: 557d3e9f2a8c8c00
RDX: 0000000000000000 RSI: 0000000000000010 RDI: ffffc90007137f58
RBP: ffffc90007137f48 R08: ffffffff8fa3a837 R09: 1ffffffff1f47506
R10: dffffc0000000000 R11: fffffbfff1f47507 R12: 0000000000000010
R13: 0000000000000010 R14: ffffc90007137f58 R15: ffff888020131cc0
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fa668b8eba9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fa669993038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007fa668dd5fa0 RCX: 00007fa668b8eba9
RDX: 0000000000000005 RSI: 0000000000002400 RDI: ffffffffffffffff
RBP: 00007fa668c11e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fa668dd6038 R14: 00007fa668dd5fa0 R15: 00007ffddc3f4d78
 </TASK>
task:udevd           state:R  running task     stack:25032 pid:5294  tgid:5294  ppid:1      task_flags:0x400140 flags:0x00004002
Call Trace:
 <TASK>
 __schedule+0x1798/0x4cc0
 preempt_schedule_irq+0xb5/0x150
 irqentry_exit+0x6f/0x90
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:lock_release+0x2b5/0x3e0
Code: 51 48 c7 44 24 20 00 00 00 00 9c 8f 44 24 20 f7 44 24 20 00 02 00 00 75 56 f7 c3 00 02 00 00 74 01 fb 65 48 8b 05 0b 2d 03 11 <48> 3b 44 24 28 0f 85 8b 00 00 00 48 83 c4 30 5b 41 5c 41 5d 41 5e
RSP: 0018:ffffc9000274f768 EFLAGS: 00000206
RAX: d690fa62ff177f00 RBX: 0000000000000202 RCX: d690fa62ff177f00
RDX: 0000000000000000 RSI: ffffffff8dba9826 RDI: ffffffff8be33e00
RBP: ffff888024414470 R08: 0000000000000000 R09: ffffffff825d759c
R10: dffffc0000000000 R11: ffffffff825db940 R12: 0000000000000000
R13: 0000000000000000 R14: ffffffff8e13a120 R15: ffff888024413980
 kernfs_root+0x1e5/0x230
 kernfs_dop_revalidate+0x8c/0x5d0
 lookup_fast+0x253/0x5b0
 link_path_walk+0x642/0xea0
 path_openat+0x28c/0x3830
 do_filp_open+0x1fa/0x410
 do_sys_openat2+0x121/0x1c0
 __x64_sys_openat+0x138/0x170
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f090691a477
RSP: 002b:00007ffe439d1668 EFLAGS: 00000287 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 000056147a4fc440 RCX: 00007f090691a477
RDX: 0000000000090800 RSI: 000056147a4e5740 RDI: 00000000ffffff9c
RBP: 000056147a515f00 R08: 0000000000090800 R09: 000056147a4e5740
R10: 0000000000000000 R11: 0000000000000287 R12: 000056147a4e5740
R13: 00000000000000ff R14: 00005614756141c4 R15: 0000000000000000
 </TASK>
rcu: rcu_preempt kthread starved for 10494 jiffies! g22989 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:26928 pid:16    tgid:16    ppid:2      task_flags:0x208040 flags:0x00004000
Call Trace:
 <TASK>
 __schedule+0x1798/0x4cc0
 schedule+0x165/0x360
 schedule_timeout+0x12b/0x270
 rcu_gp_fqs_loop+0x301/0x1540
 rcu_gp_kthread+0x99/0x390
 kthread+0x711/0x8a0
 ret_from_fork+0x439/0x7d0
 ret_from_fork_asm+0x1a/0x30
 </TASK>
rcu: Stack dump where RCU GP kthread last ran:
CPU: 1 UID: 0 PID: 8814 Comm: syz.6.825 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
RIP: 0010:smp_call_function_many_cond+0xd33/0x12d0
Code: 45 8b 2c 24 44 89 ee 83 e6 01 31 ff e8 56 63 0b 00 41 83 e5 01 49 bd 00 00 00 00 00 fc ff df 75 07 e8 01 5f 0b 00 eb 38 f3 90 <42> 0f b6 04 2b 84 c0 75 11 41 f7 04 24 01 00 00 00 74 1e e8 e5 5e
RSP: 0018:ffffc900071878a0 EFLAGS: 00000293
RAX: ffffffff81b4621b RBX: 1ffff11009608341 RCX: ffff888020cf8000
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc90007187a20 R08: ffffffff8fa3a837 R09: 1ffffffff1f47506
R10: dffffc0000000000 R11: fffffbfff1f47507 R12: ffff88804b041a08
R13: dffffc0000000000 R14: ffff88813663b1c0 R15: 0000000000000000
FS:  0000555568aba500(0000) GS:ffff8881a3c15000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fa669951d58 CR3: 0000000038a26000 CR4: 00000000000006f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <TASK>
 on_each_cpu_cond_mask+0x3f/0x80
 smp_text_poke_batch_finish+0x5f9/0x1130
 arch_jump_label_transform_apply+0x1c/0x30
 static_key_disable_cpuslocked+0xc5/0x1b0
 static_key_disable+0x1a/0x20
 tracepoint_probe_unregister+0x80e/0x9b0
 trace_event_reg+0x153/0x270
 perf_trace_event_unreg+0xb9/0x1b0
 perf_trace_destroy+0xa4/0x150
 __free_event+0x346/0x7e0
 perf_event_release_kernel+0x45b/0x510
 perf_release+0x38/0x50
 __fput+0x44c/0xa70
 task_work_run+0x1d4/0x260
 exit_to_user_mode_loop+0xec/0x110
 do_syscall_64+0x2bd/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f268738eba9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffdab306298 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4
RAX: 0000000000000000 RBX: 0000000000029769 RCX: 00007f268738eba9
RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003
RBP: 00007f26875d7da0 R08: 0000000000000001 R09: 0000001dab30658f
R10: 0000001b30f20000 R11: 0000000000000246 R12: 00007f26875d5fac
R13: 00007f26875d5fa0 R14: ffffffffffffffff R15: 00007ffdab3063b0
 </TASK>
