INFO: rcu_sched detected stalls on CPUs/tasks: (detected by 0, t=100002 jiffies, g=79443, c=79442, q=54) All QSes seen, last rcu_sched kthread activity 100002 (4295188612-4295088610), jiffies_till_next_fqs=3, root ->qsmask 0x0 syz-executor1 R running task 60272 19696 4543 0x00000008 Call Trace: sched_show_task+0x600/0x730 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+0x2627/0x2990 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+0x3a6/0x500 kernel/time/tick-sched.c:1274 __run_hrtimer kernel/time/hrtimer.c:1398 [inline] __hrtimer_run_queues+0xbfc/0x15b0 kernel/time/hrtimer.c:1460 hrtimer_interrupt+0x458/0x13d0 kernel/time/hrtimer.c:1518 local_apic_timer_interrupt+0x6b/0x250 arch/x86/kernel/apic/apic.c:1028 smp_apic_timer_interrupt+0x5a/0x90 arch/x86/kernel/apic/apic.c:1056 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:868 RIP: 0010:__read_once_size include/linux/compiler.h:197 [inline] RIP: 0010:csd_lock_wait kernel/smp.c:108 [inline] RIP: 0010:smp_call_function_single+0x36b/0x4e0 kernel/smp.c:302 Code: 3a e8 59 8e 6b 00 45 85 f6 0f 84 6d ff ff ff 41 89 de eb 10 90 66 2e 0f 1f 84 00 00 00 00 00 e8 3b 32 12 00 f3 90 8b 5c 24 78 <4c> 89 e7 e8 bd 84 6b 00 8b 00 83 e0 01 83 e3 01 85 c0 74 06 f7 d0 RSP: 0018:ffff88010bf3f7c0 EFLAGS: 00000293 ORIG_RAX: ffffffffffffff13 RAX: ffffffff81535185 RBX: 0000000000000003 RCX: ffff8801b076bb00 RDX: 0000000000000000 RSI: aaaaaaaaaaaab000 RDI: ffffea000647b7a0 RBP: ffff88010bf3f8a0 R08: 0000000000000000 R09: 0000000000000002 R10: 0000000000000000 R11: ffffffff81174df0 R12: ffff88010bf3f838 R13: 0000000000000000 R14: 0000000000000000 R15: ffff8801b076c3f8 smp_call_function_many+0x658/0xdb0 kernel/smp.c:434 on_each_cpu_mask kernel/smp.c:632 [inline] on_each_cpu_cond+0x322/0x3f0 kernel/smp.c:684 invalidate_bh_lrus+0x54/0x60 fs/buffer.c:1392 kill_bdev fs/block_dev.c:85 [inline] __blkdev_put+0x3bf/0xcb0 fs/block_dev.c:1788 blkdev_put+0x431/0x560 fs/block_dev.c:1856 blkdev_close+0xa6/0xf0 fs/block_dev.c:1863 __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 tracehook_notify_resume include/linux/tracehook.h:192 [inline] exit_to_usermode_loop arch/x86/entry/common.c:166 [inline] prepare_exit_to_usermode+0x339/0x410 arch/x86/entry/common.c:197 syscall_return_slowpath+0xdb/0x700 arch/x86/entry/common.c:268 do_syscall_64+0x1ab/0x220 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x63/0xe7 RIP: 0033:0x410c41 Code: 75 14 b8 03 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 34 19 00 00 c3 48 83 ec 08 e8 0a fc ff ff 48 89 04 24 b8 03 00 00 00 0f 05 <48> 8b 3c 24 48 89 c2 e8 53 fc ff ff 48 89 d0 48 83 c4 08 48 3d 01 RSP: 002b:0000000000a3fdc0 EFLAGS: 00000293 ORIG_RAX: 0000000000000003 RAX: 0000000000000000 RBX: 0000000000000004 RCX: 0000000000410c41 RDX: 0000000000000000 RSI: 0000000000730f88 RDI: 0000000000000003 RBP: 0000000000000000 R08: 0000000000000000 R09: ffffffffffffffff R10: 00000000009300a0 R11: 0000000000000293 R12: 0000000000000007 R13: 0000000000066bb8 R14: 00000000000001cb R15: badc0ffeebadface rcu_sched kthread starved for 100002 jiffies! g79443 c79442 f0x2 RCU_GP_WAIT_FQS(3) ->state=0x0 ->cpu=1 RCU grace-period kthread stack dump: rcu_sched R running task 61848 10 2 0x80000000 Call Trace: context_switch kernel/sched/core.c:2857 [inline] __schedule+0x667/0x770 kernel/sched/core.c:3507 schedule+0x1bc/0x2d0 kernel/sched/core.c:3551 schedule_timeout+0x3f0/0x580 kernel/time/timer.c:1801 rcu_gp_kthread+0x1da1/0x3850 kernel/rcu/tree.c:2179 kthread+0x44d/0x480 kernel/kthread.c:247 ret_from_fork+0x35/0x40 arch/x86/entry/entry_64.S:415