[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. [ 29.638021] kauditd_printk_skb: 8 callbacks suppressed [ 29.638034] audit: type=1800 audit(1545337044.637:29): pid=5901 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="rc.local" dev="sda1" ino=2432 res=0 [ 29.663605] audit: type=1800 audit(1545337044.647:30): pid=5901 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="rmnologin" dev="sda1" ino=2423 res=0 Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.0.45' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 39.433950] kasan: CONFIG_KASAN_INLINE enabled [ 39.438610] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 39.446476] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 39.452713] CPU: 0 PID: 6058 Comm: syz-executor665 Not tainted 4.20.0-rc7+ #283 [ 39.460141] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 39.469484] RIP: 0010:tcp_splice_read+0x1fd/0xf90 [ 39.474337] 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 [ 39.493221] RSP: 0018:ffff8881c1517a08 EFLAGS: 00010206 [ 39.498565] RAX: dffffc0000000000 RBX: ffff8881c1517b60 RCX: 1ffff11036b7311e [ 39.505817] RDX: 000000000000000f RSI: 0000000000000000 RDI: 0000000000000078 [ 39.513073] RBP: ffff8881c1517b88 R08: ffff8881b5b988f0 R09: 0000000000000006 [ 39.520341] R10: 0000000000000000 R11: ffff8881b5b98000 R12: ffff8881cd08cbc0 [ 39.527594] R13: 0000000000000000 R14: 0000000000000000 R15: ffff8881c1517d08 [ 39.534849] FS: 0000000000000000(0000) GS:ffff8881dae00000(0063) knlGS:0000000009296840 [ 39.543055] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 39.548917] CR2: 0000000020000140 CR3: 00000001c3a49000 CR4: 00000000001406f0 [ 39.556171] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 39.563425] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 39.570679] Call Trace: [ 39.573258] ? compat_tcp_getsockopt+0x80/0x80 [ 39.577826] ? lockdep_hardirqs_on+0x3bb/0x5b0 [ 39.582408] ? trace_hardirqs_on+0xbd/0x310 [ 39.586711] ? lock_release+0xa00/0xa00 [ 39.590681] ? lock_sock_nested+0xe2/0x120 [ 39.594915] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 39.600455] ? check_preemption_disabled+0x48/0x280 [ 39.605456] ? lock_sock_nested+0x9a/0x120 [ 39.609671] ? lock_sock_nested+0x9a/0x120 [ 39.613918] ? __local_bh_enable_ip+0x160/0x260 [ 39.618585] smc_splice_read+0x265/0x380 [ 39.622640] ? smc_unhash_sk+0x4b0/0x4b0 [ 39.626701] sock_splice_read+0xba/0x110 [ 39.630745] ? kernel_sock_shutdown+0x80/0x80 [ 39.635240] do_splice_to+0x12e/0x190 [ 39.639024] do_splice+0x1014/0x1430 [ 39.642723] ? opipe_prep.part.14+0x3b0/0x3b0 [ 39.647204] __ia32_sys_splice+0x2bf/0x320 [ 39.651436] do_fast_syscall_32+0x34d/0xfb2 [ 39.655739] ? do_int80_syscall_32+0x890/0x890 [ 39.660319] ? entry_SYSENTER_compat+0x68/0x7f [ 39.664885] ? trace_hardirqs_off_caller+0xbb/0x310 [ 39.669886] ? syscall_return_slowpath+0x5e0/0x5e0 [ 39.674798] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 39.679628] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 39.684456] ? trace_hardirqs_on_caller+0x310/0x310 [ 39.689456] ? prepare_exit_to_usermode+0x3b0/0x3b0 [ 39.694456] ? prepare_exit_to_usermode+0x291/0x3b0 [ 39.699455] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 39.704284] entry_SYSENTER_compat+0x70/0x7f [ 39.708688] RIP: 0023:0xf7faea29 [ 39.712055] Code: 85 d2 74 02 89 0a 5b 5d c3 8b 04 24 c3 8b 14 24 c3 8b 3c 24 c3 90 90 90 90 90 90 90 90 90 90 90 90 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 eb 0d 90 90 90 90 90 90 90 90 90 90 90 90 [ 39.730942] RSP: 002b:00000000ffdea49c EFLAGS: 00000282 ORIG_RAX: 0000000000000139 [ 39.738639] RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 0000000000000000 [ 39.745909] RDX: 0000000000000004 RSI: 0000000000000000 RDI: 0000000000010009 [ 39.753174] RBP: 0000000000000002 R08: 0000000000000000 R09: 0000000000000000 [ 39.760426] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 [ 39.767676] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 [ 39.774927] Modules linked in: [ 39.778726] ---[ end trace a94c2138a304413e ]--- [ 39.783530] RIP: 0010:tcp_splice_read+0x1fd/0xf90 [ 39.788389] 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 [ 39.807401] RSP: 0018:ffff8881c1517a08 EFLAGS: 00010206 [ 39.812833] RAX: dffffc0000000000 RBX: ffff8881c1517b60 RCX: 1ffff11036b7311e [ 39.820123] RDX: 000000000000000f RSI: 0000000000000000 RDI: 0000000000000078 [ 39.827378] RBP: ffff8881c1517b88 R08: ffff8881b5b988f0 R09: 0000000000000006 [ 39.834698] R10: 0000000000000000 R11: ffff8881b5b98000 R12: ffff8881cd08cbc0 [ 39.841993] R13: 0000000000000000 R14: 0000000000000000 R15: ffff8881c1517d08 [ 39.849253] FS: 0000000000000000(0000) GS:ffff8881dae00000(0063) knlGS:0000000009296840 [ 39.857506] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 39.863418] CR2: 0000000020000140 CR3: 00000001c3a49000 CR4: 00000000001406f0 [ 39.870710] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 39.877992] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 39.885281] Kernel panic - not syncing: Fatal exception [ 39.891658] Kernel Offset: disabled [ 39.895283] Rebooting in 86400 seconds..