[ 39.426014] audit: type=1800 audit(1571216605.703:32): pid=7455 uid=0 auid=4294967295 ses=4294967295 subj=system_u:system_r:kernel_t:s0 op=collect_data cause=failed(directio) comm="startpar" name="ssh" dev="sda1" ino=2450 res=0 Starting mcstransd: [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting file context maintaining daemon: restorecond[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. [ 40.252255] audit: type=1800 audit(1571216606.533:33): pid=7455 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 Warning: Permanently added '10.128.0.86' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 47.777876] kauditd_printk_skb: 2 callbacks suppressed [ 47.777892] audit: type=1400 audit(1571216614.053:36): avc: denied { map } for pid=7640 comm="syz-executor930" path="/root/syz-executor930193774" 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 [ 47.785515] kasan: CONFIG_KASAN_INLINE enabled [ 47.812171] audit: type=1800 audit(1571216614.063:37): pid=7640 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-executor930" name="bus" dev="sda1" ino=16485 res=0 [ 47.815422] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 47.845358] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 47.851627] CPU: 1 PID: 7640 Comm: syz-executor930 Not tainted 4.19.79 #0 [ 47.858546] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 47.867920] RIP: 0010:do_blockdev_direct_IO+0x2237/0x8cb0 [ 47.873542] Code: f2 ce ff e9 47 1d 00 00 e8 e6 02 b0 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 [ 47.892531] RSP: 0018:ffff88809f1773e0 EFLAGS: 00010202 [ 47.897880] RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffffff81bab7b6 [ 47.905316] RDX: 0000000000000001 RSI: ffffffff81bac4fa RDI: 0000000000000008 [ 47.912892] RBP: ffff88809f177728 R08: ffff88809bc340c0 R09: fffff9400048bc07 [ 47.920157] R10: fffff9400048bc06 R11: ffffea000245e037 R12: ffffea000245e000 [ 47.927690] R13: ffffea000245e000 R14: 0000000000000003 R15: ffff8880965b1a40 [ 47.934948] FS: 0000000000855880(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000 [ 47.943166] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 47.949032] CR2: 0000558aba657190 CR3: 00000000900f9000 CR4: 00000000001406e0 [ 47.956289] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 47.963554] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 47.970820] Call Trace: [ 47.973409] ? sb_init_dio_done_wq+0x90/0x90 [ 47.977810] ? __lock_acquire+0x231b/0x49c0 [ 47.982131] ? ext4_dio_get_block_unwritten_sync+0xf0/0xf0 [ 47.987742] ? lock_downgrade+0x880/0x880 [ 47.991933] ? ext4_dio_get_block_unwritten_sync+0xf0/0xf0 [ 47.997551] __blockdev_direct_IO+0xa1/0xca [ 48.001872] ? write_end_fn+0xf0/0xf0 [ 48.005684] ext4_direct_IO+0x990/0x19e0 [ 48.009820] ? ext4_dio_get_block_unwritten_sync+0xf0/0xf0 [ 48.015486] generic_file_direct_write+0x20f/0x4b0 [ 48.020415] __generic_file_write_iter+0x2ee/0x630 [ 48.025539] ext4_file_write_iter+0x32b/0x1060 [ 48.030183] ? ext4_file_mmap+0x410/0x410 [ 48.034355] do_iter_readv_writev+0x558/0x830 [ 48.038947] ? vfs_dedupe_file_range+0x6f0/0x6f0 [ 48.043970] ? security_file_permission+0x89/0x230 [ 48.048889] ? rw_verify_area+0x118/0x360 [ 48.053427] do_iter_write+0x184/0x5f0 [ 48.057324] ? rcu_read_lock_sched_held+0x110/0x130 [ 48.062337] ? __kmalloc+0x5e1/0x750 [ 48.066040] vfs_iter_write+0x77/0xb0 [ 48.069838] iter_file_splice_write+0x661/0xbd0 [ 48.074508] ? page_cache_pipe_buf_confirm+0x2b0/0x2b0 [ 48.079774] ? rcu_read_lock_sched_held+0x110/0x130 [ 48.085036] ? rcu_sync_lockdep_assert+0x6d/0xb0 [ 48.089776] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 48.095304] ? __sb_start_write+0x1a9/0x360 [ 48.099614] ? page_cache_pipe_buf_confirm+0x2b0/0x2b0 [ 48.104888] do_splice+0x642/0x12c0 [ 48.108513] ? putname+0xf4/0x130 [ 48.111980] ? opipe_prep.part.0+0x2d0/0x2d0 [ 48.116406] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 48.121950] ? __fget_light+0x1a9/0x230 [ 48.125990] __x64_sys_splice+0x2c6/0x330 [ 48.130162] do_syscall_64+0xfd/0x620 [ 48.134076] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 48.139343] RIP: 0033:0x4402f9 [ 48.142566] 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 [ 48.161549] RSP: 002b:00007ffc388f0ac8 EFLAGS: 00000246 ORIG_RAX: 0000000000000113 [ 48.169242] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 00000000004402f9 [ 48.176498] RDX: 0000000000000007 RSI: 0000000000000000 RDI: 0000000000000004 [ 48.183752] RBP: 00000000006ca018 R08: 00000000ffffffff R09: 0000000000000000 [ 48.191003] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000401b80 [ 48.198261] R13: 0000000000401c10 R14: 0000000000000000 R15: 0000000000000000 [ 48.205782] Modules linked in: [ 48.209738] ---[ end trace fdec7bfad885be38 ]--- [ 48.214559] RIP: 0010:do_blockdev_direct_IO+0x2237/0x8cb0 [ 48.220084] Code: f2 ce ff e9 47 1d 00 00 e8 e6 02 b0 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 [ 48.239044] RSP: 0018:ffff88809f1773e0 EFLAGS: 00010202 [ 48.244477] RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffffff81bab7b6 [ 48.251776] RDX: 0000000000000001 RSI: ffffffff81bac4fa RDI: 0000000000000008 [ 48.259051] RBP: ffff88809f177728 R08: ffff88809bc340c0 R09: fffff9400048bc07 [ 48.266451] R10: fffff9400048bc06 R11: ffffea000245e037 R12: ffffea000245e000 [ 48.273804] R13: ffffea000245e000 R14: 0000000000000003 R15: ffff8880965b1a40 [ 48.281154] FS: 0000000000855880(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000 [ 48.289496] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 48.295440] CR2: 0000558aba657190 CR3: 00000000900f9000 CR4: 00000000001406e0 [ 48.302743] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 48.310012] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 48.317357] Kernel panic - not syncing: Fatal exception [ 48.324435] Kernel Offset: disabled [ 48.328079] Rebooting in 86400 seconds..