INFO: rcu_sched detected stalls on CPUs/tasks: (detected by 0, t=100002 jiffies, g=42329, c=42328, q=142) All QSes seen, last rcu_sched kthread activity 99997 (4294979632-4294879635), jiffies_till_next_fqs=3, root ->qsmask 0x0 syz-executor5 R running task 56176 12076 4633 0x0000000e Call Trace: sched_show_task+0x610/0x760 kernel/sched/core.c:5332 print_other_cpu_stall kernel/rcu/tree.c:1441 [inline] check_cpu_stall kernel/rcu/tree.c:1559 [inline] __rcu_pending kernel/rcu/tree.c:3244 [inline] rcu_pending kernel/rcu/tree.c:3291 [inline] rcu_check_callbacks+0x2632/0x29a0 kernel/rcu/tree.c:2646 update_process_times+0x132/0x1a0 kernel/time/timer.c:1636 tick_sched_handle kernel/time/tick-sched.c:164 [inline] tick_sched_timer+0x3bf/0x520 kernel/time/tick-sched.c:1274 __run_hrtimer kernel/time/hrtimer.c:1398 [inline] __hrtimer_run_queues+0xc74/0x1680 kernel/time/hrtimer.c:1460 hrtimer_interrupt+0x451/0x13c0 kernel/time/hrtimer.c:1518 local_apic_timer_interrupt+0x6b/0x250 arch/x86/kernel/apic/apic.c:1025 smp_apic_timer_interrupt+0x5a/0x90 arch/x86/kernel/apic/apic.c:1053 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:868 RIP: 0010:rep_nop arch/x86/include/asm/processor.h:658 [inline] RIP: 0010:cpu_relax arch/x86/include/asm/processor.h:663 [inline] RIP: 0010:csd_lock_wait kernel/smp.c:108 [inline] RIP: 0010:smp_call_function_single+0x357/0x500 kernel/smp.c:302 Code: 85 93 00 00 00 e8 89 c5 12 00 e9 be 00 00 00 8b 3a e8 1d 74 6e 00 45 85 f6 74 91 41 89 de eb 08 0f 1f 00 e8 6b c5 12 00 f3 90 <8b> 5c 24 58 4c 89 e7 e8 dd 69 6e 00 8b 00 83 e0 01 83 e3 01 85 c0 RSP: 0018:ffff8801308af420 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 RAX: ffffffff815565a5 RBX: 0000000000000001 RCX: 0000000000040000 RDX: ffffc900033a6000 RSI: 000000000003ffff RDI: 0000000000040000 RBP: ffff8801308af4e8 R08: 0000000000000000 R09: 0000000000000002 R10: 0000000000000000 R11: ffffffff8117d090 R12: ffff8801308af478 R13: 0000000000000000 R14: 0000000000000000 R15: ffff88013817e180 smp_call_function_many+0x672/0xe30 kernel/smp.c:434 on_each_cpu_mask kernel/smp.c:632 [inline] on_each_cpu_cond+0x335/0x420 kernel/smp.c:684 invalidate_bh_lrus+0x54/0x60 fs/buffer.c:1392 kill_bdev fs/block_dev.c:85 [inline] __blkdev_put+0x44b/0xcc0 fs/block_dev.c:1787 blkdev_put+0x435/0x570 fs/block_dev.c:1855 blkdev_close+0xa6/0xf0 fs/block_dev.c:1862 __fput+0x458/0xa30 fs/file_table.c:209 ____fput+0x37/0x40 fs/file_table.c:243 task_work_run+0x22e/0x2b0 kernel/task_work.c:113 get_signal+0x1f87/0x2190 kernel/signal.c:2298 do_signal+0xca/0x2060 arch/x86/kernel/signal.c:816 exit_to_usermode_loop arch/x86/entry/common.c:162 [inline] prepare_exit_to_usermode+0x297/0x430 arch/x86/entry/common.c:197 syscall_return_slowpath+0x108/0x800 arch/x86/entry/common.c:268 do_syscall_64+0x1ad/0x230 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x63/0xe7 RIP: 0033:0x455ab9 Code: 1d ba fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 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 0f 83 eb b9 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f9875f3bc68 EFLAGS: 00000246 ORIG_RAX: 0000000000000028 RAX: 00000000003b0000 RBX: 00007f9875f3c6d4 RCX: 0000000000455ab9 RDX: 0000000020000000 RSI: 0000000000000013 RDI: 0000000000000013 RBP: 000000000072bea0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000002000005 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000004c0d79 R14: 00000000004d1380 R15: 0000000000000000 rcu_sched kthread starved for 99997 jiffies! g42329 c42328 f0x2 RCU_GP_WAIT_FQS(3) ->state=0x0 ->cpu=1 RCU grace-period kthread stack dump: rcu_sched R running task 61768 10 2 0x80000000 Call Trace: context_switch kernel/sched/core.c:2857 [inline] __schedule+0x652/0x780 kernel/sched/core.c:3507 schedule+0x1cc/0x300 kernel/sched/core.c:3551 schedule_timeout+0x416/0x5b0 kernel/time/timer.c:1801 rcu_gp_kthread+0x1ed1/0x3a40 kernel/rcu/tree.c:2179 kthread+0x473/0x4b0 kernel/kthread.c:247 ret_from_fork+0x35/0x40 arch/x86/entry/entry_64.S:415