rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: (detected by 1, t=10502 jiffies, g=54461, q=31) rcu: All QSes seen, last rcu_preempt kthread activity 10501 (4294992529-4294982028), jiffies_till_next_fqs=1, root ->qsmask 0x0 syz-executor.1 R running task 26808 24292 8096 0x00000000 Call Trace: sched_show_task kernel/sched/core.c:5338 [inline] sched_show_task.cold+0x291/0x2fc kernel/sched/core.c:5313 print_other_cpu_stall kernel/rcu/tree.c:1313 [inline] check_cpu_stall kernel/rcu/tree.c:1441 [inline] rcu_pending kernel/rcu/tree.c:3103 [inline] rcu_sched_clock_irq.cold+0xa10/0xa4a kernel/rcu/tree.c:2544 update_process_times+0x32/0x80 kernel/time/timer.c:1635 tick_sched_handle+0xa2/0x190 kernel/time/tick-sched.c:161 tick_sched_timer+0x47/0x130 kernel/time/tick-sched.c:1271 __run_hrtimer kernel/time/hrtimer.c:1389 [inline] __hrtimer_run_queues+0x33e/0xde0 kernel/time/hrtimer.c:1451 hrtimer_interrupt+0x314/0x770 kernel/time/hrtimer.c:1509 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1035 [inline] smp_apic_timer_interrupt+0x120/0x570 arch/x86/kernel/apic/apic.c:1060 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:807 RIP: 0010:avc_has_perm+0x0/0x610 security/selinux/avc.c:1191 Code: ba fe e9 5d fd ff ff e8 de c9 ba fe e9 df fb ff ff 48 89 df e8 d1 c9 ba fe e9 22 fc ff ff e8 a7 67 55 fe 0f 1f 80 00 00 00 00 <55> 48 89 e5 41 57 48 8d 85 f8 fe ff ff 41 56 48 c1 e8 03 41 55 41 RSP: 0018:ffff888055987680 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 RAX: 0000000000000007 RBX: ffff888096d5af30 RCX: 0000000000000007 RDX: 0000000000000126 RSI: 00000000000000e0 RDI: ffffffff8a6a2780 RBP: ffff8880559876b8 R08: 0000000000000004 R09: ffff888055987710 R10: ffffed1015d25bc7 R11: ffff8880ae92de3b R12: 00000000000000e0 R13: 0000000000000004 R14: ffff888055987710 R15: 0000000000000000 file_has_perm+0x2ef/0x3a0 security/selinux/hooks.c:1755 selinux_revalidate_file_permission security/selinux/hooks.c:3385 [inline] selinux_file_permission+0x3ee/0x570 security/selinux/hooks.c:3406 security_file_permission+0x7e/0x380 security/security.c:1325 rw_verify_area+0x110/0x360 fs/read_write.c:391 do_iter_write+0x100/0x610 fs/read_write.c:952 vfs_iter_write+0x77/0xb0 fs/read_write.c:970 iter_file_splice_write+0x662/0xbe0 fs/splice.c:745 do_splice_from fs/splice.c:847 [inline] direct_splice_actor+0x126/0x1a0 fs/splice.c:1019 splice_direct_to_actor+0x369/0x970 fs/splice.c:974 do_splice_direct+0x1da/0x2a0 fs/splice.c:1062 do_sendfile+0x597/0xd00 fs/read_write.c:1443 __do_sys_sendfile64 fs/read_write.c:1504 [inline] __se_sys_sendfile64 fs/read_write.c:1490 [inline] __x64_sys_sendfile64+0x1dd/0x220 fs/read_write.c:1490 do_syscall_64+0x103/0x610 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x4582b9 Code: ad b8 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 7b b8 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007fdbcc412c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000028 RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 00000000004582b9 RDX: 0000000000000000 RSI: 0000000000000005 RDI: 0000000000000003 RBP: 000000000073bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 00008000fffffffe R11: 0000000000000246 R12: 00007fdbcc4136d4 R13: 00000000004c5227 R14: 00000000004d9368 R15: 00000000ffffffff rcu: rcu_preempt kthread starved for 10548 jiffies! g54461 f0x2 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=1 rcu: RCU grace-period kthread stack dump: rcu_preempt R running task 28920 10 2 0x80000000 Call Trace: context_switch kernel/sched/core.c:2877 [inline] __schedule+0x817/0x1cc0 kernel/sched/core.c:3518 schedule+0x92/0x180 kernel/sched/core.c:3562 schedule_timeout+0x4db/0xfd0 kernel/time/timer.c:1803 rcu_gp_fqs_loop kernel/rcu/tree.c:1971 [inline] rcu_gp_kthread+0x962/0x17b0 kernel/rcu/tree.c:2128 kthread+0x357/0x430 kernel/kthread.c:253 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:352