rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	1-...!: (1 GPs behind) idle=877c/1/0x4000000000000000 softirq=32661/32670 fqs=2
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P13428/1:b..l
	(detected by 0, t=10505 jiffies, g=52369, q=280 ncpus=2)
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 3659 Comm: syz-executor.2 Not tainted 6.0.0-rc6-syzkaller-00286-ga63f2e7cb110 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/26/2022
RIP: 0010:lookup_object lib/debugobjects.c:195 [inline]
RIP: 0010:debug_object_deactivate lib/debugobjects.c:734 [inline]
RIP: 0010:debug_object_deactivate+0x14f/0x300 lib/debugobjects.c:720
Code: ed 74 44 49 bc 00 00 00 00 00 fc ff df 48 8d 7d 18 83 c3 01 48 89 f8 48 c1 e8 03 42 80 3c 20 00 0f 85 1e 01 00 00 4c 3b 7d 18 <74> 74 48 89 e8 48 c1 e8 03 42 80 3c 20 00 0f 85 22 01 00 00 48 8b
RSP: 0018:ffffc900001f0d58 EFLAGS: 00000046
RAX: 1ffff1100ee29c2d RBX: 0000000000000001 RCX: ffffffff815ff480
RDX: 1ffffffff226b565 RSI: 0000000000000016 RDI: ffff88807714e168
RBP: ffff88807714e150 R08: ffffffff9135ab18 R09: 0000000000000003
R10: fffff5200003e199 R11: 0000000000000000 R12: dffffc0000000000
R13: ffffffff89ef1280 R14: 1ffff9200003e1ad R15: ffff88801f4ebb40
FS:  0000555555c7b400(0000) GS:ffff8880b9b00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000555555c84848 CR3: 0000000034a2c000 CR4: 0000000000350ee0
Call Trace:
 <IRQ>
 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
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:649
RIP: 0010:__find_get_block+0x229/0xe20 fs/buffer.c:1305
Code: bd f0 94 ff 49 8d 7f 60 be 04 00 00 00 e8 8f 53 e1 ff f0 41 ff 47 60 eb 03 45 31 ed e8 a0 f0 94 ff e8 cb 67 9b ff fb 4d 85 ed <0f> 84 ad 01 00 00 e8 8c f0 94 ff 0f 1f 44 00 00 e8 82 f0 94 ff 65
RSP: 0018:ffffc90003bcf9c0 EFLAGS: 00000282
RAX: 0000000000531e37 RBX: 0000000000000000 RCX: 1ffffffff212436e
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffff888076f98cb0 R08: 0000000000000001 R09: ffffffff908e59df
R10: 0000000000000001 R11: 0000000000000000 R12: 00000000000011ce
R13: ffff888074d51cb0 R14: 0000000000035f80 R15: ffff888074d51cb0
 __getblk_gfp+0x28/0x80 fs/buffer.c:1329
 sb_getblk include/linux/buffer_head.h:363 [inline]
 ext4_getblk+0x20d/0x7a0 fs/ext4/inode.c:868
 ext4_bread+0x2a/0x190 fs/ext4/inode.c:914
 __ext4_read_dirblock.part.0+0x34/0xc10 fs/ext4/namei.c:139
 __ext4_read_dirblock fs/ext4/namei.c:129 [inline]
 ext4_empty_dir+0x226/0xa20 fs/ext4/namei.c:3055
 ext4_rmdir fs/ext4/namei.c:3138 [inline]
 ext4_rmdir+0x392/0xfb0 fs/ext4/namei.c:3104
 vfs_rmdir.part.0+0x1b0/0x5a0 fs/namei.c:4098
 vfs_rmdir fs/namei.c:4083 [inline]
 do_rmdir+0x3a6/0x430 fs/namei.c:4159
 __do_sys_unlinkat fs/namei.c:4339 [inline]
 __se_sys_unlinkat fs/namei.c:4333 [inline]
 __x64_sys_unlinkat+0xeb/0x130 fs/namei.c:4333
 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: 0033:0x7f712c289fd7
Code: 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 b8 07 01 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fff36abefa8 EFLAGS: 00000207 ORIG_RAX: 0000000000000107
RAX: ffffffffffffffda RBX: 0000000000000065 RCX: 00007f712c289fd7
RDX: 0000000000000200 RSI: 00007fff36ac0130 RDI: 00000000ffffff9c
RBP: 00007fff36abf070 R08: 0000000000000000 R09: 00007fff36abee40
R10: 0000555555c7c8e3 R11: 0000000000000207 R12: 00007f712c2e45d6
R13: 00007fff36ac0130 R14: 0000555555c7c810 R15: 00007fff36ac0170
 </TASK>
task:syz-executor.1  state:R  running task     stack:29144 pid:13428 ppid:  3656 flags:0x00000000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5182 [inline]
 __schedule+0xadf/0x52b0 kernel/sched/core.c:6494
 preempt_schedule_irq+0x4e/0x90 kernel/sched/core.c:6806
 irqentry_exit+0x31/0x80 kernel/entry/common.c:428
 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:649
RIP: 0010:check_kcov_mode kernel/kcov.c:166 [inline]
RIP: 0010:__sanitizer_cov_trace_pc+0x1c/0x60 kernel/kcov.c:200
Code: be a8 01 00 00 e8 b4 ff ff ff 31 c0 c3 90 65 8b 05 49 66 86 7e 89 c1 48 8b 34 24 81 e1 00 01 00 00 65 48 8b 14 25 80 6f 02 00 <a9> 00 01 ff 00 74 0e 85 c9 74 35 8b 82 bc 15 00 00 85 c0 74 2b 8b
RSP: 0000:ffffc90004387bc0 EFLAGS: 00000246
RAX: 0000000080000000 RBX: ffff8880261af630 RCX: 0000000000000000
RDX: ffff888024d4bb00 RSI: ffffffff81a462f2 RDI: 0000000000000007
RBP: ffffea0001c91440 R08: 0000000000000007 R09: 0000000000000063
R10: 0000000000000063 R11: 0000000000000001 R12: 0000000000000063
R13: ffff888020266308 R14: 0000000000000001 R15: 0000000000000100
 filemap_map_pages+0x852/0x1e00 mm/filemap.c:3346
 do_fault_around mm/memory.c:4487 [inline]
 do_read_fault mm/memory.c:4513 [inline]
 do_fault mm/memory.c:4647 [inline]
 handle_pte_fault mm/memory.c:4911 [inline]
 __handle_mm_fault+0x210e/0x39b0 mm/memory.c:5053
 handle_mm_fault+0x1c8/0x780 mm/memory.c:5151
 do_user_addr_fault+0x475/0x1210 arch/x86/mm/fault.c:1397
 handle_page_fault arch/x86/mm/fault.c:1488 [inline]
 exc_page_fault+0x94/0x170 arch/x86/mm/fault.c:1544
 asm_exc_page_fault+0x22/0x30 arch/x86/include/asm/idtentry.h:570
RIP: 0033:0x7f8b4c2a06fb
RSP: 002b:00007ffe6879ae08 EFLAGS: 00010202
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000001
RDX: 0000000000000000 RSI: 00007f8b4c30b660 RDI: 0000000000000001
RBP: 00007ffe6879b360 R08: 00007ffe6879b327 R09: cccccccccccccccd
R10: 0000000000000000 R11: 0000000000000000 R12: 00007ffe6879b380
R13: 00007f8b4c2e5482 R14: 00007ffe6879b500 R15: 0000000000000075
 </TASK>
rcu: rcu_preempt kthread starved for 10495 jiffies! g52369 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:28728 pid:   17 ppid:     2 flags:0x00004000
Call Trace:
 <TASK>
 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
 </TASK>
rcu: Stack dump where RCU GP kthread last ran:
NMI backtrace for cpu 0
CPU: 0 PID: 92 Comm: kworker/u4:4 Not tainted 6.0.0-rc6-syzkaller-00286-ga63f2e7cb110 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/26/2022
Workqueue: events_unbound toggle_allocation_gate
Call Trace:
 <IRQ>
 __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
 </IRQ>
 <TASK>
 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 30 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 4f 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:ffffc900015b7948 EFLAGS: 00000293
RAX: 0000000000000000 RBX: ffff8880b9b3edc0 RCX: 0000000000000000
RDX: ffff8880182bd880 RSI: ffffffff817158a1 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
 </TASK>