INFO: rcu_sched detected stalls on CPUs/tasks: (detected by 0, t=100002 jiffies, g=18841, c=18840, q=92) All QSes seen, last rcu_sched kthread activity 100002 (4294976739-4294876737), jiffies_till_next_fqs=3, root ->qsmask 0x0 syz-executor0 R running task 59456 7032 4557 0x8000000a 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:get_current arch/x86/include/asm/current.h:15 [inline] RIP: 0010:__sanitizer_cov_trace_pc+0xd/0x50 kernel/kcov.c:100 Code: 00 48 83 c4 30 5b 41 5c 41 5d 41 5e 41 5f 5d c3 90 90 90 90 90 90 90 90 90 90 90 90 90 48 8b 04 24 65 48 8b 0c 25 80 fc 02 00 <65> 8b 14 25 94 fc 02 00 f7 c2 00 01 1f 00 75 2c 8b 91 b8 18 00 00 RSP: 0018:ffff88012f32f758 EFLAGS: 00000202 ORIG_RAX: ffffffffffffff13 RAX: ffffffff81535185 RBX: 0000000000000001 RCX: ffff880133481d80 RDX: ffff88012f34f7d8 RSI: aaaaaaaaaaaab000 RDI: ffffea00071b31a0 RBP: ffff88012f32f840 R08: 0000000000000000 R09: 0000000000000002 R10: 0000000000000000 R11: ffffffff81174df0 R12: ffff88012f32f7d8 R13: 0000000000000000 R14: 0000000000000000 R15: ffff880133482678 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 exit_task_work include/linux/task_work.h:22 [inline] do_exit+0x10ee/0x3890 kernel/exit.c:867 do_group_exit+0x1a0/0x350 kernel/exit.c:970 __do_sys_exit_group+0x21/0x30 kernel/exit.c:981 __se_sys_exit_group+0x14/0x20 kernel/exit.c:979 __x64_sys_exit_group+0x4c/0x50 kernel/exit.c:979 do_syscall_64+0x15b/0x220 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x63/0xe7 RIP: 0033:0x457089 Code: fd b4 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 cb b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:0000000000a3fda8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 RAX: ffffffffffffffda RBX: 000000000000001e RCX: 0000000000457089 RDX: 0000000000410c41 RSI: fffffffffffffff7 RDI: 0000000000000000 RBP: 0000000000000000 R08: ffffffffffffffff R09: 0000000000032f88 R10: ffffffffffffffff R11: 0000000000000246 R12: 0000000000000001 R13: 0000000000032f88 R14: 0000000000000010 R15: badc0ffeebadface rcu_sched kthread starved for 100002 jiffies! g18841 c18840 f0x2 RCU_GP_WAIT_FQS(3) ->state=0x0 ->cpu=1 RCU grace-period kthread stack dump: rcu_sched R running task 61928 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