rcu: INFO: rcu_preempt self-detected stall on CPU rcu: 0-...!: (10499 ticks this GP) idle=63a/1/0x4000000000000002 softirq=13885/13885 fqs=8 (t=10500 jiffies g=6761 q=440) rcu: rcu_preempt kthread starved for 10482 jiffies! g6761 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=1 rcu: RCU grace-period kthread stack dump: rcu_preempt R running task 28984 10 2 0x80004000 Call Trace: context_switch kernel/sched/core.c:3385 [inline] __schedule+0x9a0/0xcc0 kernel/sched/core.c:4081 schedule+0x181/0x210 kernel/sched/core.c:4155 schedule_timeout+0x14f/0x240 kernel/time/timer.c:1895 rcu_gp_fqs_loop kernel/rcu/tree.c:1661 [inline] rcu_gp_kthread+0xed8/0x1770 kernel/rcu/tree.c:1821 kthread+0x332/0x350 kernel/kthread.c:255 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352 NMI backtrace for cpu 0 CPU: 0 PID: 8505 Comm: syz-executor.3 Not tainted 5.5.0-rc5-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1fb/0x318 lib/dump_stack.c:118 nmi_cpu_backtrace+0xaf/0x1a0 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x174/0x290 lib/nmi_backtrace.c:62 arch_trigger_cpumask_backtrace+0x10/0x20 arch/x86/kernel/apic/hw_nmi.c:38 trigger_single_cpu_backtrace include/linux/nmi.h:164 [inline] rcu_dump_cpu_stacks+0x15a/0x220 kernel/rcu/tree_stall.h:254 print_cpu_stall kernel/rcu/tree_stall.h:455 [inline] check_cpu_stall kernel/rcu/tree_stall.h:529 [inline] rcu_pending kernel/rcu/tree.c:2827 [inline] rcu_sched_clock_irq+0xe25/0x1ad0 kernel/rcu/tree.c:2271 update_process_times+0x12d/0x180 kernel/time/timer.c:1726 tick_sched_handle kernel/time/tick-sched.c:167 [inline] tick_sched_timer+0x263/0x420 kernel/time/tick-sched.c:1310 __run_hrtimer kernel/time/hrtimer.c:1517 [inline] __hrtimer_run_queues+0x403/0x840 kernel/time/hrtimer.c:1579 hrtimer_interrupt+0x38c/0xda0 kernel/time/hrtimer.c:1641 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1110 [inline] smp_apic_timer_interrupt+0x109/0x280 arch/x86/kernel/apic/apic.c:1135 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:829 RIP: 0010:free_thread_stack+0x195/0x590 kernel/fork.c:284 Code: 2e 00 74 08 4c 89 e7 e8 39 94 6a 00 49 8b 1c 24 48 83 c3 08 48 89 d8 48 c1 e8 03 42 80 3c 28 00 74 08 48 89 df e8 1b 94 6a 00 <48> 8b 1b e9 82 ff ff ff e8 be 2b 2e 00 43 80 3c 2e 00 75 18 eb 1e RSP: 0018:ffffc90001f372d8 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 RAX: 1ffff11014292241 RBX: ffff8880a1491208 RCX: ffff888097564540 RDX: 0000000000000000 RSI: 00000000fffffffc RDI: ffffea0002558140 RBP: ffffc90001f37310 R08: 000000000003a728 R09: fffffbfff124248a R10: fffffbfff124248a R11: 0000000000000000 R12: ffff888099df0120 R13: dffffc0000000000 R14: 1ffff110133be024 R15: ffff8880a7c213f8 release_task_stack kernel/fork.c:440 [inline] put_task_stack+0xa3/0x130 kernel/fork.c:451 finish_task_switch+0x3f1/0x550 kernel/sched/core.c:3256 context_switch kernel/sched/core.c:3388 [inline] __schedule+0x9a8/0xcc0 kernel/sched/core.c:4081 preempt_schedule_irq+0xc1/0x140 kernel/sched/core.c:4338 retint_kernel+0x1b/0x2b RIP: 0010:stack_trace_consume_entry+0x187/0x260 kernel/stacktrace.c:95 Code: df 48 8b 4d b8 8a 04 01 84 c0 0f 85 c7 00 00 00 48 8b 45 c0 8b 18 44 89 ff 89 de e8 f3 fc 10 00 41 39 df 0f 92 c0 48 83 c4 28 <5b> 41 5c 41 5d 41 5e 41 5f 5d c3 48 8b 4d c8 80 e1 07 80 c1 03 38 RSP: 0018:ffffc90001f37528 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff13 RAX: ffff888097564501 RBX: 0000000000000040 RCX: 0000000000000000 RDX: 000000000000000a RSI: 0000000000000040 RDI: 000000000000000b RBP: ffffc90001f37550 R08: ffffffff8165c2fd R09: ffffc90001f37560 R10: fffff520003e6eb8 R11: 0000000000000000 R12: dffffc0000000000 R13: ffffc90001f37610 R14: 000000000000000a R15: 000000000000000b arch_stack_walk+0xa8/0xe0 arch/x86/kernel/stacktrace.c:27 stack_trace_save+0xb6/0x150 kernel/stacktrace.c:123 save_stack mm/kasan/common.c:72 [inline] set_track mm/kasan/common.c:80 [inline] __kasan_kmalloc+0x11c/0x1b0 mm/kasan/common.c:513 kasan_slab_alloc+0xf/0x20 mm/kasan/common.c:521 slab_post_alloc_hook mm/slab.h:584 [inline] slab_alloc mm/slab.c:3320 [inline] kmem_cache_alloc+0x1f5/0x2e0 mm/slab.c:3484 kmem_cache_zalloc include/linux/slab.h:660 [inline] fill_pool lib/debugobjects.c:166 [inline] __debug_object_init+0x1262/0x19a0 lib/debugobjects.c:536 debug_object_init lib/debugobjects.c:591 [inline] debug_object_activate+0x17a/0x6f0 lib/debugobjects.c:677 debug_rcu_head_queue kernel/rcu/rcu.h:176 [inline] __call_rcu+0x3d/0x670 kernel/rcu/tree.c:2595 call_rcu+0xb/0x10 kernel/rcu/tree.c:2682 security_inode_free+0xbb/0xd0 security/security.c:947 __destroy_inode+0x26a/0x5b0 fs/inode.c:255 destroy_inode fs/inode.c:278 [inline] evict+0x5a2/0x6c0 fs/inode.c:591 iput_final fs/inode.c:1570 [inline] iput+0x508/0x690 fs/inode.c:1596 dentry_unlink_inode+0x2e0/0x3d0 fs/dcache.c:374 __dentry_kill+0x3e2/0x5e0 fs/dcache.c:579 dentry_kill fs/dcache.c:673 [inline] dput+0x460/0x6f0 fs/dcache.c:859 __fput+0x4d3/0x740 fs/file_table.c:293 ____fput+0x15/0x20 fs/file_table.c:313 task_work_run+0x17e/0x1b0 kernel/task_work.c:113 tracehook_notify_resume include/linux/tracehook.h:188 [inline] exit_to_usermode_loop arch/x86/entry/common.c:164 [inline] prepare_exit_to_usermode+0x483/0x5b0 arch/x86/entry/common.c:195 syscall_return_slowpath+0x113/0x4a0 arch/x86/entry/common.c:278 do_syscall_64+0x11f/0x1c0 arch/x86/entry/common.c:304 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45ed03 Code: 48 89 ee 48 89 e7 e8 5c 16 fa ff 31 c0 48 89 e2 be 33 89 00 00 89 df e8 bb c0 ff ff 85 c0 78 17 48 63 fb b8 03 00 00 00 0f 05 <8b> 44 24 10 48 83 c4 38 5b 5d c3 66 90 48 c7 c2 d4 ff ff ff 48 63 RSP: 002b:00007ffeb714d780 EFLAGS: 00000246 ORIG_RAX: 0000000000000003 RAX: 0000000000000000 RBX: 0000000000000004 RCX: 000000000045ed03 RDX: 00007ffeb714d780 RSI: 0000000000008933 RDI: 0000000000000004 RBP: 00000000004c04e8 R08: 0000000000000002 R09: 00007ffeb714d868 R10: 0000000000000019 R11: 0000000000000246 R12: 00000000004c04e8 R13: 0000000000000000 R14: 0000000000000003 R15: 00007ffeb714d868