[ 37.530821] audit: type=1800 audit(1571978253.666:32): pid=7286 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 OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting file context maintaining daemon: restorecond[?25l[?1c7[ ok 8[?25h[?0c. [ 38.270934] audit: type=1800 audit(1571978254.486:33): pid=7286 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 '10.128.0.37' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 47.632421] kauditd_printk_skb: 2 callbacks suppressed [ 47.632438] audit: type=1400 audit(1571978263.846:36): avc: denied { map } for pid=7473 comm="syz-executor854" path="/root/syz-executor854545614" 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 [ 47.640967] kasan: CONFIG_KASAN_INLINE enabled [ 47.670966] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 47.678726] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 47.684994] CPU: 1 PID: 7473 Comm: syz-executor854 Not tainted 4.19.80 #0 [ 47.691900] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 47.701348] RIP: 0010:do_blockdev_direct_IO+0x2237/0x8cb0 [ 47.707032] 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 [ 47.728499] RSP: 0018:ffff88809bd4f3e0 EFLAGS: 00010202 [ 47.749090] RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffffff81babe56 [ 47.756351] RDX: 0000000000000001 RSI: ffffffff81bacb9a RDI: 0000000000000008 [ 47.763602] RBP: ffff88809bd4f728 R08: ffff88809352e000 R09: fffff940004aa3c7 [ 47.770852] R10: fffff940004aa3c6 R11: ffffea0002551e37 R12: ffffea0002551e00 [ 47.778151] R13: ffffea0002551e00 R14: 0000000000000003 R15: ffff888097587a40 [ 47.785471] FS: 00000000013d1880(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000 [ 47.793896] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 47.799819] CR2: 0000557c863c21b0 CR3: 000000009f2a5000 CR4: 00000000001406e0 [ 47.808127] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 47.815667] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 47.822932] Call Trace: [ 47.825522] ? sb_init_dio_done_wq+0x90/0x90 [ 47.829927] ? __lock_acquire+0x231b/0x49c0 [ 47.834329] ? ext4_dio_get_block_unwritten_sync+0xf0/0xf0 [ 47.840053] ? lock_downgrade+0x880/0x880 [ 47.850079] ? ext4_dio_get_block_unwritten_sync+0xf0/0xf0 [ 47.855747] __blockdev_direct_IO+0xa1/0xca [ 47.860057] ? write_end_fn+0xf0/0xf0 [ 47.863844] ext4_direct_IO+0x990/0x19e0 [ 47.868054] ? ext4_dio_get_block_unwritten_sync+0xf0/0xf0 [ 47.873801] generic_file_direct_write+0x20f/0x4b0 [ 47.878738] __generic_file_write_iter+0x2ee/0x630 [ 47.883782] ext4_file_write_iter+0x32b/0x1060 [ 47.888437] ? ext4_file_mmap+0x410/0x410 [ 47.892613] do_iter_readv_writev+0x558/0x830 [ 47.897121] ? vfs_dedupe_file_range+0x6f0/0x6f0 [ 47.902291] ? security_file_permission+0x89/0x230 [ 47.907290] ? rw_verify_area+0x118/0x360 [ 47.911435] do_iter_write+0x184/0x5f0 [ 47.915317] ? rcu_read_lock_sched_held+0x110/0x130 [ 47.920326] ? __kmalloc+0x5e1/0x750 [ 47.924024] vfs_iter_write+0x77/0xb0 [ 47.927814] iter_file_splice_write+0x661/0xbd0 [ 47.932472] ? page_cache_pipe_buf_confirm+0x2b0/0x2b0 [ 47.937751] ? rcu_read_lock_sched_held+0x110/0x130 [ 47.942946] ? rcu_sync_lockdep_assert+0x6d/0xb0 [ 47.947688] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 47.953217] ? __sb_start_write+0x1a9/0x360 [ 47.957523] ? page_cache_pipe_buf_confirm+0x2b0/0x2b0 [ 47.962785] do_splice+0x642/0x12c0 [ 47.966460] ? putname+0xf4/0x130 [ 47.969917] ? opipe_prep.part.0+0x2d0/0x2d0 [ 47.974362] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 47.979925] ? __fget_light+0x1a9/0x230 [ 47.983898] __x64_sys_splice+0x2c6/0x330 [ 47.988041] do_syscall_64+0xfd/0x620 [ 47.991830] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 47.997021] RIP: 0033:0x440309 [ 48.000208] 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 [ 48.019100] RSP: 002b:00007ffc488b4fa8 EFLAGS: 00000246 ORIG_RAX: 0000000000000113 [ 48.026798] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440309 [ 48.034050] RDX: 0000000000000007 RSI: 0000000000000000 RDI: 0000000000000004 [ 48.041474] RBP: 00000000006ca018 R08: 00000000ffffffff R09: 0000000000000000 [ 48.048728] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000401b90 [ 48.055982] R13: 0000000000401c20 R14: 0000000000000000 R15: 0000000000000000 [ 48.063251] Modules linked in: [ 48.066858] ---[ end trace 30cb1f2344c981dc ]--- [ 48.071660] RIP: 0010:do_blockdev_direct_IO+0x2237/0x8cb0 [ 48.077474] 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 [ 48.096431] RSP: 0018:ffff88809bd4f3e0 EFLAGS: 00010202 [ 48.101800] RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffffff81babe56 [ 48.109170] RDX: 0000000000000001 RSI: ffffffff81bacb9a RDI: 0000000000000008 [ 48.116498] RBP: ffff88809bd4f728 R08: ffff88809352e000 R09: fffff940004aa3c7 [ 48.123842] R10: fffff940004aa3c6 R11: ffffea0002551e37 R12: ffffea0002551e00 [ 48.131154] R13: ffffea0002551e00 R14: 0000000000000003 R15: ffff888097587a40 [ 48.138487] FS: 00000000013d1880(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000 [ 48.146779] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 48.152675] CR2: 0000557c863c21b0 CR3: 000000009f2a5000 CR4: 00000000001406e0 [ 48.160241] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 48.167544] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 48.174871] Kernel panic - not syncing: Fatal exception [ 48.181626] Kernel Offset: disabled [ 48.185256] Rebooting in 86400 seconds..