audit: type=1400 audit(1536293408.391:95): avc: denied { write } for pid=10505 comm="syz-executor0" path="socket:[23430]" dev="sockfs" ino=23430 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=netlink_fib_lookup_socket permissive=1 INFO: task jbd2/sda1-8:75 blocked for more than 140 seconds. Not tainted 4.14.68+ #4 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. jbd2/sda1-8 D26960 75 2 0x80000000 Call Trace: schedule+0x7f/0x1b0 kernel/sched/core.c:3490 io_schedule+0x1c/0x70 kernel/sched/core.c:5097 bit_wait_io+0x9/0x90 kernel/sched/wait_bit.c:249 __wait_on_bit+0xad/0x130 kernel/sched/wait_bit.c:51 out_of_line_wait_on_bit+0xd1/0x100 kernel/sched/wait_bit.c:64 wait_on_bit_io include/linux/wait_bit.h:106 [inline] __wait_on_buffer+0x58/0x70 fs/buffer.c:125 wait_on_buffer include/linux/buffer_head.h:354 [inline] journal_wait_on_commit_record fs/jbd2/commit.c:177 [inline] jbd2_journal_commit_transaction+0x484a/0x648c fs/jbd2/commit.c:868 kjournald2+0x244/0x820 fs/jbd2/journal.c:233 kthread+0x348/0x420 kernel/kthread.c:232 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:402 INFO: task syz-executor5:10524 blocked for more than 140 seconds. Not tainted 4.14.68+ #4 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor5 D27968 10524 2076 0x00000004 Call Trace: schedule+0x7f/0x1b0 kernel/sched/core.c:3490 jbd2_log_wait_commit+0x2a5/0x3f0 fs/jbd2/journal.c:730 ext4_sync_fs+0x473/0x7b0 fs/ext4/super.c:4927 sync_fs_one_sb+0xb8/0xf0 fs/sync.c:80 iterate_supers+0x122/0x250 fs/super.c:613 sys_sync+0xb7/0x160 fs/sync.c:115 do_syscall_64+0x19b/0x4b0 arch/x86/entry/common.c:289 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x457099 RSP: 002b:00007f178ab8bc78 EFLAGS: 00000246 ORIG_RAX: 00000000000000a2 RAX: ffffffffffffffda RBX: 00007f178ab8c6d4 RCX: 0000000000457099 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 00000000009301e0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000004d6f30 R14: 00000000004c873c R15: 0000000000000002 Showing all locks held in the system: 1 lock held by khungtaskd/23: #0: (tasklist_lock){.+.+}, at: [] debug_show_all_locks+0x74/0x20f kernel/locking/lockdep.c:4541 2 locks held by getty/1989: #0: (&tty->ldisc_sem){++++}, at: [] tty_ldisc_ref_wait+0x20/0x80 drivers/tty/tty_ldisc.c:275 #1: (&ldata->atomic_read_lock){+.+.}, at: [] n_tty_read+0x1ff/0x15e0 drivers/tty/n_tty.c:2142 1 lock held by syz-executor5/10524: #0: (&type->s_umount_key#34){++++}, at: [] iterate_supers+0xd6/0x250 fs/super.c:611 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 23 Comm: khungtaskd Not tainted 4.14.68+ #4 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0xb9/0x11b lib/dump_stack.c:53 nmi_cpu_backtrace.cold.0+0x47/0x85 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x121/0x146 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:138 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:196 [inline] watchdog+0x574/0xa70 kernel/hung_task.c:252 kthread+0x348/0x420 kernel/kthread.c:232 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:402 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 10517 Comm: syz-executor7 Not tainted 4.14.68+ #4 task: ffff8801c0a20000 task.stack: ffff8801d26f8000 RIP: 0010:entry_SYSCALL_64+0xc/0x24 arch/x86/entry/entry_64.S:215 RSP: 0018:00007f9aed23ecf8 EFLAGS: 00000046 RAX: 00000000000000ca RBX: 00000000009300a8 RCX: 0000000000457099 RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00000000009300a8 RBP: 00000000009300a0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000009300ac R13: 00007ffc137bacdf R14: 00007f9aed23f9c0 R15: 0000000000000000 FS: 00007f9aed23f700(0000) GS:ffff8801dba00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000001f0f978 CR3: 00000001c959e002 CR4: 00000000001606b0 Call Trace: Code: 01 f8 48 0f 07 66 2e 0f 1f 84 00 00 00 00 00 5f eb 31 0f 1f 00 66 2e 0f 1f 84 00 00 00 00 00 0f 01 f8 65 48 89 24 25 c8 d0 01 00 <65> 48 8b 24 25 0c 90 00 00 6a 2b 65 ff 34 25 c8 d0 01 00 41 53