[....] 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. [ 28.601443] kauditd_printk_skb: 8 callbacks suppressed [ 28.601455] audit: type=1800 audit(1545335767.552:29): pid=5870 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 [ 28.631933] audit: type=1800 audit(1545335767.552:30): pid=5870 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 '10.128.0.60' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 38.439295] kasan: CONFIG_KASAN_INLINE enabled [ 38.444050] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 38.451528] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 38.457764] CPU: 0 PID: 6024 Comm: syz-executor756 Not tainted 4.20.0-rc7+ #380 [ 38.465195] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 38.474538] RIP: 0010:tcp_splice_read+0x1fd/0xf90 [ 38.479364] 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 [ 38.498250] RSP: 0018:ffff8881b6347a58 EFLAGS: 00010206 [ 38.503598] RAX: dffffc0000000000 RBX: ffff8881b6347bb0 RCX: 1ffff11036730196 [ 38.510850] RDX: 000000000000000f RSI: 0000000000000000 RDI: 0000000000000078 [ 38.518099] RBP: ffff8881b6347bd8 R08: ffff8881b3980cb0 R09: 0000000000000006 [ 38.525349] R10: 0000000000000000 R11: ffff8881b39803c0 R12: ffff8881c15bac00 [ 38.532597] R13: 0000000000000000 R14: 0000000000000000 R15: ffff8881b6347d58 [ 38.539845] FS: 0000000000ecd880(0000) GS:ffff8881dae00000(0000) knlGS:0000000000000000 [ 38.548053] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 38.553915] CR2: 0000000020000140 CR3: 00000001c175f000 CR4: 00000000001406f0 [ 38.561169] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 38.568419] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 38.575668] Call Trace: [ 38.578243] ? compat_tcp_getsockopt+0x80/0x80 [ 38.582809] ? lockdep_hardirqs_on+0x3bb/0x5b0 [ 38.587375] ? trace_hardirqs_on+0xbd/0x310 [ 38.591676] ? lock_release+0xa00/0xa00 [ 38.595631] ? lock_sock_nested+0xe2/0x120 [ 38.599850] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 38.605371] ? check_preemption_disabled+0x48/0x280 [ 38.610372] ? lock_sock_nested+0x9a/0x120 [ 38.614585] ? lock_sock_nested+0x9a/0x120 [ 38.618799] ? __local_bh_enable_ip+0x160/0x260 [ 38.623452] smc_splice_read+0x265/0x380 [ 38.627496] ? smc_unhash_sk+0x4b0/0x4b0 [ 38.631542] sock_splice_read+0xba/0x110 [ 38.635583] ? kernel_sock_shutdown+0x80/0x80 [ 38.640056] do_splice_to+0x12e/0x190 [ 38.643838] do_splice+0x1014/0x1430 [ 38.647534] ? opipe_prep.part.14+0x3b0/0x3b0 [ 38.652013] __x64_sys_splice+0x2c1/0x330 [ 38.656145] do_syscall_64+0x1b9/0x820 [ 38.660013] ? entry_SYSCALL_64_after_hwframe+0x3e/0xbe [ 38.665358] ? syscall_return_slowpath+0x5e0/0x5e0 [ 38.670280] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 38.675129] ? trace_hardirqs_on_caller+0x310/0x310 [ 38.680124] ? prepare_exit_to_usermode+0x3b0/0x3b0 [ 38.685123] ? prepare_exit_to_usermode+0x291/0x3b0 [ 38.690124] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 38.694954] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 38.700124] RIP: 0033:0x4400e9 [ 38.703301] 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 [ 38.722205] RSP: 002b:00007ffeaf5a5818 EFLAGS: 00000216 ORIG_RAX: 0000000000000113 [ 38.729891] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 00000000004400e9 [ 38.737140] RDX: 0000000000000004 RSI: 0000000000000000 RDI: 0000000000000005 [ 38.744390] RBP: 00000000006ca018 R08: 0000000000010009 R09: 0000000000000002 [ 38.751639] R10: 0000000000000000 R11: 0000000000000216 R12: 0000000000401970 [ 38.758885] R13: 0000000000401a00 R14: 0000000000000000 R15: 0000000000000000 [ 38.766138] Modules linked in: [ 38.770284] ---[ end trace 7a77d966feb417b3 ]--- [ 38.775054] RIP: 0010:tcp_splice_read+0x1fd/0xf90 [ 38.779878] 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 [ 38.799040] RSP: 0018:ffff8881b6347a58 EFLAGS: 00010206 [ 38.804440] RAX: dffffc0000000000 RBX: ffff8881b6347bb0 RCX: 1ffff11036730196 [ 38.811727] RDX: 000000000000000f RSI: 0000000000000000 RDI: 0000000000000078 [ 38.818986] RBP: ffff8881b6347bd8 R08: ffff8881b3980cb0 R09: 0000000000000006 [ 38.826277] R10: 0000000000000000 R11: ffff8881b39803c0 R12: ffff8881c15bac00 [ 38.833560] R13: 0000000000000000 R14: 0000000000000000 R15: ffff8881b6347d58 [ 38.840853] FS: 0000000000ecd880(0000) GS:ffff8881dae00000(0000) knlGS:0000000000000000 [ 38.849074] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 38.854970] CR2: 0000000020000140 CR3: 00000001c175f000 CR4: 00000000001406f0 [ 38.862287] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 38.869539] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 38.876824] Kernel panic - not syncing: Fatal exception [ 38.883096] Kernel Offset: disabled [ 38.886716] Rebooting in 86400 seconds..