[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. Starting mcstransd: [....] Starting file context maintaining daemon: restorecond[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. [ 39.118857] audit: type=1800 audit(1571354222.898:33): pid=7418 uid=0 auid=4294967295 ses=4294967295 subj=system_u:system_r:kernel_t:s0 op=collect_data cause=failed(directio) comm="startpar" name="rc.local" dev="sda1" ino=2465 res=0 Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 42.814113] kauditd_printk_skb: 1 callbacks suppressed [ 42.814128] audit: type=1400 audit(1571354226.598:35): avc: denied { map } for pid=7595 comm="bash" path="/bin/bash" dev="sda1" ino=1457 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=system_u:object_r:file_t:s0 tclass=file permissive=1 Warning: Permanently added '10.128.0.153' (ECDSA) to the list of known hosts. executing program [ 49.394236] audit: type=1400 audit(1571354233.178:36): avc: denied { map } for pid=7607 comm="syz-executor952" path="/root/syz-executor952292515" dev="sda1" ino=16484 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:object_r:user_home_t:s0 tclass=file permissive=1 [ 49.401607] kasan: CONFIG_KASAN_INLINE enabled [ 49.421228] audit: type=1800 audit(1571354233.178:37): pid=7607 uid=0 auid=4294967295 ses=4294967295 subj=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 op=collect_data cause=failed(directio) comm="syz-executor952" name="bus" dev="sda1" ino=16485 res=0 [ 49.425490] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 49.455810] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 49.462219] CPU: 0 PID: 7607 Comm: syz-executor952 Not tainted 4.19.80 #0 [ 49.469218] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 49.478586] RIP: 0010:do_blockdev_direct_IO+0x2237/0x8cb0 [ 49.484109] Code: eb ce ff e9 47 1d 00 00 e8 a6 fb af ff 48 8b 84 24 00 01 00 00 48 8d 78 08 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 5d 6a 00 00 4c 8b b4 24 00 01 00 00 31 ff 4d 8b [ 49.503170] RSP: 0018:ffff888097ee73e0 EFLAGS: 00010202 [ 49.508603] RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffffff81babe56 [ 49.515864] RDX: 0000000000000001 RSI: ffffffff81bacb9a RDI: 0000000000000008 [ 49.523179] RBP: ffff888097ee7728 R08: ffff888098e925c0 R09: fffff940004b5947 [ 49.530547] R10: fffff940004b5946 R11: ffffea00025aca37 R12: ffffea00025aca00 [ 49.537910] R13: ffffea00025aca00 R14: 0000000000000003 R15: ffff888097167a40 [ 49.545184] FS: 00000000025d5880(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000 [ 49.553408] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 49.559277] CR2: 0000000020788ffc CR3: 0000000092330000 CR4: 00000000001406f0 [ 49.566542] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 49.573803] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 49.581066] Call Trace: [ 49.583661] ? ext4_xattr_check_entries+0x32d/0x3b0 [ 49.588716] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 49.594358] ? sb_init_dio_done_wq+0x90/0x90 [ 49.598754] ? __lock_acquire+0x231b/0x49c0 [ 49.603072] ? current_time+0x6f/0x140 [ 49.606960] ? ext4_dio_get_block_unwritten_sync+0xf0/0xf0 [ 49.612581] ? lock_downgrade+0x880/0x880 [ 49.616715] ? ext4_dio_get_block_unwritten_sync+0xf0/0xf0 [ 49.622343] __blockdev_direct_IO+0xa1/0xca [ 49.626673] ? write_end_fn+0xf0/0xf0 [ 49.630475] ext4_direct_IO+0x990/0x19e0 [ 49.634687] ? ext4_dio_get_block_unwritten_sync+0xf0/0xf0 [ 49.640316] generic_file_direct_write+0x20f/0x4b0 [ 49.645845] __generic_file_write_iter+0x2ee/0x630 [ 49.650779] ext4_file_write_iter+0x32b/0x1060 [ 49.655495] ? ext4_file_mmap+0x410/0x410 [ 49.659642] do_iter_readv_writev+0x558/0x830 [ 49.664148] ? vfs_dedupe_file_range+0x6f0/0x6f0 [ 49.668895] ? security_file_permission+0x89/0x230 [ 49.673824] ? rw_verify_area+0x118/0x360 [ 49.677968] do_iter_write+0x184/0x5f0 [ 49.681846] ? rcu_read_lock_sched_held+0x110/0x130 [ 49.686851] ? __kmalloc+0x5e1/0x750 [ 49.690562] vfs_iter_write+0x77/0xb0 [ 49.694358] iter_file_splice_write+0x661/0xbd0 [ 49.699014] ? page_cache_pipe_buf_confirm+0x2b0/0x2b0 [ 49.704282] ? rcu_read_lock_sched_held+0x110/0x130 [ 49.709288] ? rcu_sync_lockdep_assert+0x6d/0xb0 [ 49.714040] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 49.719570] ? __sb_start_write+0x1a9/0x360 [ 49.723966] ? page_cache_pipe_buf_confirm+0x2b0/0x2b0 [ 49.729310] do_splice+0x642/0x12c0 [ 49.733111] ? putname+0xf4/0x130 [ 49.736562] ? opipe_prep.part.0+0x2d0/0x2d0 [ 49.740956] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 49.746491] ? __fget_light+0x1a9/0x230 [ 49.750461] __x64_sys_splice+0x2c6/0x330 [ 49.754605] do_syscall_64+0xfd/0x620 [ 49.758409] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 49.763579] RIP: 0033:0x440309 [ 49.766766] Code: 18 89 d0 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 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 fb 13 fc ff c3 66 2e 0f 1f 84 00 00 00 00 [ 49.786607] RSP: 002b:00007ffebc6b88d8 EFLAGS: 00000246 ORIG_RAX: 0000000000000113 [ 49.794323] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440309 [ 49.801595] RDX: 0000000000000007 RSI: 0000000000000000 RDI: 0000000000000004 [ 49.808854] RBP: 00000000006ca018 R08: 00000000ffffffff R09: 0000000000000000 [ 49.816129] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000401b90 [ 49.823382] R13: 0000000000401c20 R14: 0000000000000000 R15: 0000000000000000 [ 49.830639] Modules linked in: [ 49.834219] ---[ end trace cb2accb0a329c70a ]--- [ 49.838982] RIP: 0010:do_blockdev_direct_IO+0x2237/0x8cb0 [ 49.844706] Code: eb ce ff e9 47 1d 00 00 e8 a6 fb af ff 48 8b 84 24 00 01 00 00 48 8d 78 08 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 5d 6a 00 00 4c 8b b4 24 00 01 00 00 31 ff 4d 8b [ 49.863689] RSP: 0018:ffff888097ee73e0 EFLAGS: 00010202 [ 49.869105] RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffffff81babe56 [ 49.876418] RDX: 0000000000000001 RSI: ffffffff81bacb9a RDI: 0000000000000008 [ 49.883739] RBP: ffff888097ee7728 R08: ffff888098e925c0 R09: fffff940004b5947 [ 49.891081] R10: fffff940004b5946 R11: ffffea00025aca37 R12: ffffea00025aca00 [ 49.898343] R13: ffffea00025aca00 R14: 0000000000000003 R15: ffff888097167a40 [ 49.905759] FS: 00000000025d5880(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000 [ 49.914116] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 49.919989] CR2: 0000000020788ffc CR3: 0000000092330000 CR4: 00000000001406f0 [ 49.927453] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 49.934765] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 49.942075] Kernel panic - not syncing: Fatal exception [ 49.949196] Kernel Offset: disabled [ 49.952828] Rebooting in 86400 seconds..