audit: type=1400 audit(1550814986.750:36): avc: denied { map } for pid=8058 comm="syz-executor004" path="/root/syz-executor004991115" 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 hrtimer: interrupt took 42841 ns rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: (detected by 1, t=10502 jiffies, g=5873, q=2) rcu: All QSes seen, last rcu_preempt kthread activity 10502 (4295059997-4295049495), jiffies_till_next_fqs=1, root ->qsmask 0x0 syz-executor004 R running task 26448 8069 8060 0x00000000 Call Trace: sched_show_task kernel/sched/core.c:5306 [inline] sched_show_task.cold+0x292/0x30b kernel/sched/core.c:5281 print_other_cpu_stall kernel/rcu/tree.c:1301 [inline] check_cpu_stall kernel/rcu/tree.c:1429 [inline] rcu_pending kernel/rcu/tree.c:3018 [inline] rcu_check_callbacks.cold+0xa10/0xa4a kernel/rcu/tree.c:2521 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:__sanitizer_cov_trace_pc+0x0/0x50 kernel/kcov.c:94 Code: e5 08 41 bc f4 ff ff ff e8 11 9f ea ff 48 c7 05 12 fb e5 08 00 00 00 00 e9 c8 e9 ff ff 90 90 90 90 90 90 90 90 90 90 90 90 90 <55> 48 89 e5 48 8b 75 08 65 48 8b 04 25 40 ee 01 00 65 8b 15 38 0c RSP: 0018:ffff888084ed72c0 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 RAX: dffffc0000000000 RBX: ffff88809a2205c0 RCX: ffffffff81e7c36c RDX: 1ffff11013444114 RSI: ffffffff81e7c37a RDI: ffff88809a2208a0 RBP: ffff888084ed7300 R08: ffff88808fa28240 R09: ffffed1015d25bd0 R10: ffffed1015d25bcf R11: ffff8880ae92de7b R12: 0000000000000002 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000001 __ext4_journal_start fs/ext4/ext4_jbd2.h:311 [inline] ext4_dirty_inode+0x64/0xc0 fs/ext4/inode.c:6081 __mark_inode_dirty+0x919/0x1290 fs/fs-writeback.c:2155 mark_inode_dirty include/linux/fs.h:2125 [inline] __generic_write_end+0x1b9/0x240 fs/buffer.c:2118 generic_write_end+0x6c/0x90 fs/buffer.c:2163 ext4_da_write_end+0x3c8/0xa50 fs/ext4/inode.c:3204 generic_perform_write+0x2f0/0x530 mm/filemap.c:3219 __generic_file_write_iter+0x25e/0x630 mm/filemap.c:3333 ext4_file_write_iter+0x33f/0x1160 fs/ext4/file.c:266 call_write_iter include/linux/fs.h:1863 [inline] do_iter_readv_writev+0x5e0/0x8e0 fs/read_write.c:680 do_iter_write fs/read_write.c:956 [inline] do_iter_write+0x184/0x610 fs/read_write.c:937 vfs_iter_write+0x77/0xb0 fs/read_write.c:969 iter_file_splice_write+0x667/0xbe0 fs/splice.c:749 do_splice_from fs/splice.c:851 [inline] direct_splice_actor+0x126/0x1a0 fs/splice.c:1023 splice_direct_to_actor+0x369/0x970 fs/splice.c:978 do_splice_direct+0x1da/0x2a0 fs/splice.c:1066 do_sendfile+0x597/0xd00 fs/read_write.c:1436 __do_sys_sendfile64 fs/read_write.c:1491 [inline] __se_sys_sendfile64 fs/read_write.c:1483 [inline] __x64_sys_sendfile64+0x15a/0x220 fs/read_write.c:1483 do_syscall_64+0x103/0x610 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x446a59 Code: e8 dc e6 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 4b 07 fc ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007fce454e5db8 EFLAGS: 00000246 ORIG_RAX: 0000000000000028 RAX: ffffffffffffffda RBX: 00000000006dcc28 RCX: 0000000000446a59 RDX: 0000000020000000 RSI: 0000000000000003 RDI: 0000000000000003 RBP: 00000000006dcc20 R08: 0000000000000000 R09: 0000000000000000 R10: 00008080fffffffe R11: 0000000000000246 R12: 00000000006dcc2c R13: 00007ffd7bf04daf R14: 00007fce454e69c0 R15: 20c49ba5e353f7cf rcu: rcu_preempt kthread starved for 10502 jiffies! g5873 f0x2 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=1 rcu: RCU grace-period kthread stack dump: rcu_preempt R running task 29200 10 2 0x80000000 Call Trace: context_switch kernel/sched/core.c:2844 [inline] __schedule+0x817/0x1cc0 kernel/sched/core.c:3485 schedule+0x92/0x180 kernel/sched/core.c:3529 schedule_timeout+0x4db/0xfd0 kernel/time/timer.c:1803 rcu_gp_fqs_loop kernel/rcu/tree.c:1948 [inline] rcu_gp_kthread+0x956/0x17a0 kernel/rcu/tree.c:2105 kthread+0x357/0x430 kernel/kthread.c:246 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:352