[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 40.672084] audit: type=1800 audit(1545832395.854:25): pid=7903 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 40.701133] audit: type=1800 audit(1545832395.854:26): pid=7903 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 40.748318] audit: type=1800 audit(1545832395.854:27): pid=7903 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="restorecond" dev="sda1" ino=2436 res=0 [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.15.218' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 51.122098] kasan: CONFIG_KASAN_INLINE enabled [ 51.126884] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 51.134495] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 51.140737] CPU: 0 PID: 8053 Comm: syz-executor448 Not tainted 4.20.0-rc7-next-20181224 #188 [ 51.149297] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 51.158648] RIP: 0010:tcp_splice_read+0x1fd/0xf90 [ 51.163501] Code: 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 52 0c 00 00 48 b8 00 00 00 00 00 fc ff df 4d 8b 6d 18 49 8d 7d 78 48 89 fa 48 c1 ea 03 <0f> b6 04 02 84 c0 74 08 3c 03 0f 8e e5 0a 00 00 45 8b 6d 78 31 ff [ 51.182403] RSP: 0018:ffff8881b38ffa58 EFLAGS: 00010206 [ 51.187751] RAX: dffffc0000000000 RBX: ffff8881b38ffbb0 RCX: 1ffff1103701597e [ 51.195006] RDX: 000000000000000f RSI: 0000000000000000 RDI: 0000000000000078 [ 51.202259] RBP: ffff8881b38ffbd8 R08: ffff8881b80acbf0 R09: 0000000000000006 [ 51.209510] R10: 0000000000000000 R11: ffff8881b80ac300 R12: ffff8881d4678040 [ 51.216766] R13: 0000000000000000 R14: 0000000000000000 R15: ffff8881b38ffd58 [ 51.224019] FS: 000000000070d880(0000) GS:ffff8881dac00000(0000) knlGS:0000000000000000 [ 51.232244] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 51.238149] CR2: 0000000020000140 CR3: 00000001d7a56000 CR4: 00000000001406f0 [ 51.245405] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 51.252659] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 51.259910] Call Trace: [ 51.262500] ? compat_tcp_getsockopt+0x80/0x80 [ 51.267078] ? lockdep_hardirqs_on+0x421/0x5c0 [ 51.271648] ? trace_hardirqs_on+0xbd/0x310 [ 51.275955] ? lock_release+0xa00/0xa00 [ 51.279916] ? lock_sock_nested+0xe2/0x120 [ 51.284138] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 51.289683] ? check_preemption_disabled+0x48/0x280 [ 51.294699] ? lock_sock_nested+0x9a/0x120 [ 51.298925] ? lock_sock_nested+0x9a/0x120 [ 51.303147] ? __local_bh_enable_ip+0x160/0x260 [ 51.307799] smc_splice_read+0x265/0x380 [ 51.311879] ? smc_unhash_sk+0x4b0/0x4b0 [ 51.315986] sock_splice_read+0xba/0x110 [ 51.320036] ? copy_overflow+0x30/0x30 [ 51.323903] do_splice_to+0x12e/0x190 [ 51.327682] do_splice+0x1014/0x1430 [ 51.331393] ? opipe_prep.part.14+0x3b0/0x3b0 [ 51.335867] __x64_sys_splice+0x2c1/0x330 [ 51.340017] do_syscall_64+0x1b9/0x820 [ 51.343920] ? entry_SYSCALL_64_after_hwframe+0x3e/0xbe [ 51.349265] ? syscall_return_slowpath+0x5e0/0x5e0 [ 51.354189] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 51.359037] ? trace_hardirqs_on_caller+0x310/0x310 [ 51.364060] ? prepare_exit_to_usermode+0x3b0/0x3b0 [ 51.369071] ? prepare_exit_to_usermode+0x291/0x3b0 [ 51.374070] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 51.378896] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 51.384065] RIP: 0033:0x4400e9 [ 51.387241] 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 [ 51.406127] RSP: 002b:00007fffbb8e3128 EFLAGS: 00000212 ORIG_RAX: 0000000000000113 [ 51.413823] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 00000000004400e9 [ 51.421079] RDX: 0000000000000004 RSI: 0000000000000000 RDI: 0000000000000005 [ 51.428334] RBP: 00000000006ca018 R08: 0000000000010009 R09: 0000000000000002 [ 51.435588] R10: 0000000000000000 R11: 0000000000000212 R12: 0000000000401970 [ 51.442843] R13: 0000000000401a00 R14: 0000000000000000 R15: 0000000000000000 [ 51.450106] Modules linked in: [ 51.453910] ---[ end trace 78b2ddfd05cb85d2 ]--- [ 51.458673] RIP: 0010:tcp_splice_read+0x1fd/0xf90 [ 51.463562] Code: 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 52 0c 00 00 48 b8 00 00 00 00 00 fc ff df 4d 8b 6d 18 49 8d 7d 78 48 89 fa 48 c1 ea 03 <0f> b6 04 02 84 c0 74 08 3c 03 0f 8e e5 0a 00 00 45 8b 6d 78 31 ff [ 51.482497] RSP: 0018:ffff8881b38ffa58 EFLAGS: 00010206 [ 51.487845] RAX: dffffc0000000000 RBX: ffff8881b38ffbb0 RCX: 1ffff1103701597e [ 51.495154] RDX: 000000000000000f RSI: 0000000000000000 RDI: 0000000000000078 [ 51.502687] RBP: ffff8881b38ffbd8 R08: ffff8881b80acbf0 R09: 0000000000000006 [ 51.509972] R10: 0000000000000000 R11: ffff8881b80ac300 R12: ffff8881d4678040 [ 51.517298] R13: 0000000000000000 R14: 0000000000000000 R15: ffff8881b38ffd58 [ 51.524773] FS: 000000000070d880(0000) GS:ffff8881dac00000(0000) knlGS:0000000000000000 [ 51.533054] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 51.538989] CR2: 0000000020000140 CR3: 00000001d7a56000 CR4: 00000000001406f0 [ 51.546286] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 51.553571] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 51.560874] Kernel panic - not syncing: Fatal exception [ 51.567169] Kernel Offset: disabled [ 51.570796] Rebooting in 86400 seconds..