audit: type=1400 audit(1561207928.558:36): avc: denied { map } for pid=7583 comm="syz-executor978" path="/root/syz-executor978141630" dev="sda1" ino=1426 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:object_r:user_home_t:s0 tclass=file permissive=1 rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: (detected by 1, t=10502 jiffies, g=5293, q=20) rcu: All QSes seen, last rcu_preempt kthread activity 10503 (4295055363-4295044860), jiffies_till_next_fqs=1, root ->qsmask 0x0 syz-executor978 R running task 26464 7592 7585 0x00000000 Call Trace: sched_show_task kernel/sched/core.c:5297 [inline] sched_show_task.cold+0x292/0x30b kernel/sched/core.c:5272 print_other_cpu_stall kernel/rcu/tree.c:1430 [inline] check_cpu_stall kernel/rcu/tree.c:1557 [inline] __rcu_pending kernel/rcu/tree.c:3293 [inline] rcu_pending kernel/rcu/tree.c:3336 [inline] rcu_check_callbacks.cold+0xaa1/0xd93 kernel/rcu/tree.c:2682 update_process_times+0x32/0x80 kernel/time/timer.c:1636 tick_sched_handle+0xa2/0x190 kernel/time/tick-sched.c:164 tick_sched_timer+0x47/0x130 kernel/time/tick-sched.c:1274 __run_hrtimer kernel/time/hrtimer.c:1398 [inline] __hrtimer_run_queues+0x33b/0xdd0 kernel/time/hrtimer.c:1460 hrtimer_interrupt+0x314/0x770 kernel/time/hrtimer.c:1518 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1029 [inline] smp_apic_timer_interrupt+0x111/0x550 arch/x86/kernel/apic/apic.c:1054 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:869 RIP: 0010:arch_local_save_flags arch/x86/include/asm/paravirt.h:783 [inline] RIP: 0010:arch_local_irq_save arch/x86/include/asm/paravirt.h:805 [inline] RIP: 0010:lock_is_held_type+0x87/0x210 kernel/locking/lockdep.c:3934 Code: 72 88 48 ba 00 00 00 00 00 fc ff df 48 c1 e8 03 80 3c 10 00 0f 85 69 01 00 00 48 83 3d d1 8e 20 07 00 0f 84 20 01 00 00 9c 58 <0f> 1f 44 00 00 48 c7 c2 50 36 72 88 48 89 c3 48 b8 00 00 00 00 00 RSP: 0018:ffff8880908b7428 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff13 RAX: 0000000000000286 RBX: ffff8880a112e700 RCX: 0000000000000000 RDX: dffffc0000000000 RSI: 00000000ffffffff RDI: ffff8880a112ef7c RBP: ffff8880908b7448 R08: ffff8880a112e700 R09: ffffed1015d24733 R10: ffffed1015d24732 R11: ffff8880ae923993 R12: ffffffff8879d760 R13: ffff88808efad4f0 R14: 000000000496d9e4 R15: ffff88808efad6f0 lock_is_held include/linux/lockdep.h:344 [inline] rcu_read_lock_sched_held+0x110/0x130 kernel/rcu/update.c:118 trace_ext4_da_write_end include/trace/events/ext4.h:382 [inline] ext4_da_write_end+0x865/0xa50 fs/ext4/inode.c:3146 generic_perform_write+0x2ed/0x520 mm/filemap.c:3150 __generic_file_write_iter+0x25e/0x630 mm/filemap.c:3264 ext4_file_write_iter+0x32b/0x1060 fs/ext4/file.c:266 call_write_iter include/linux/fs.h:1820 [inline] do_iter_readv_writev+0x558/0x830 fs/read_write.c:681 do_iter_write fs/read_write.c:960 [inline] do_iter_write+0x184/0x5f0 fs/read_write.c:941 vfs_iter_write+0x77/0xb0 fs/read_write.c:973 iter_file_splice_write+0x661/0xbd0 fs/splice.c:750 do_splice_from fs/splice.c:852 [inline] direct_splice_actor+0x123/0x190 fs/splice.c:1019 splice_direct_to_actor+0x2e7/0x890 fs/splice.c:974 do_splice_direct+0x1da/0x2a0 fs/splice.c:1062 do_sendfile+0x597/0xce0 fs/read_write.c:1447 __do_sys_sendfile64 fs/read_write.c:1502 [inline] __se_sys_sendfile64 fs/read_write.c:1494 [inline] __x64_sys_sendfile64+0x15a/0x220 fs/read_write.c:1494 do_syscall_64+0xfd/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x4417c9 Code: e8 7c e7 ff ff 48 83 c4 18 c3 0f 1f 80 00 00 00 00 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 bb 07 fc ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007ffedf309698 EFLAGS: 00000246 ORIG_RAX: 0000000000000028 RAX: ffffffffffffffda RBX: 00007ffedf309840 RCX: 00000000004417c9 RDX: 0000000020000000 RSI: 0000000000000003 RDI: 0000000000000003 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 00008080fffffffe R11: 0000000000000246 R12: 0000000000000000 R13: 00000000004024a0 R14: 0000000000000000 R15: 0000000000000000 rcu: rcu_preempt kthread starved for 10549 jiffies! g5293 f0x2 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=0 rcu: RCU grace-period kthread stack dump: rcu_preempt R running task 29624 10 2 0x80000000 Call Trace: context_switch kernel/sched/core.c:2826 [inline] __schedule+0x80d/0x1c70 kernel/sched/core.c:3474 schedule+0x92/0x1c0 kernel/sched/core.c:3518 schedule_timeout+0x4db/0xfc0 kernel/time/timer.c:1804 rcu_gp_kthread+0xd5c/0x2190 kernel/rcu/tree.c:2202 kthread+0x354/0x420 kernel/kthread.c:246 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415