[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 63.646463] audit: type=1800 audit(1542552287.691:25): pid=6631 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 63.665755] audit: type=1800 audit(1542552287.691:26): pid=6631 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 63.685239] audit: type=1800 audit(1542552287.721:27): pid=6631 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 '10.128.0.93' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 74.935980] ================================================================== [ 74.943372] BUG: KMSAN: uninit-value in keyctl_pkey_params_get+0x29c/0x7d0 [ 74.950377] CPU: 0 PID: 6781 Comm: syz-executor808 Not tainted 4.20.0-rc2+ #88 [ 74.957729] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 74.967070] Call Trace: [ 74.969657] dump_stack+0x32d/0x480 [ 74.973277] ? keyctl_pkey_params_get+0x29c/0x7d0 [ 74.978138] kmsan_report+0x19f/0x300 [ 74.981939] __msan_warning+0x76/0xc0 [ 74.985753] keyctl_pkey_params_get+0x29c/0x7d0 [ 74.990433] keyctl_pkey_verify+0x2e2/0x890 [ 74.994769] __se_sys_keyctl+0x112c/0x1af0 [ 74.999011] ? prepare_exit_to_usermode+0x182/0x4c0 [ 75.004032] ? syscall_return_slowpath+0xed/0x730 [ 75.008918] ? __msan_get_context_state+0x9/0x20 [ 75.013687] __x64_sys_keyctl+0x62/0x80 [ 75.017657] do_syscall_64+0xcf/0x110 [ 75.021460] entry_SYSCALL_64_after_hwframe+0x63/0xe7 [ 75.026643] RIP: 0033:0x440129 [ 75.029830] 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 [ 75.048739] RSP: 002b:00007ffdb5c1f8d8 EFLAGS: 00000286 ORIG_RAX: 00000000000000fa [ 75.056441] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440129 [ 75.063698] RDX: 00000000200002c0 RSI: 00000000200000c0 RDI: 000000000000001c [ 75.070956] RBP: 00000000006ca018 R08: 0000000020000380 R09: 0000000000000000 [ 75.078217] R10: 00000000fffffd2a R11: 0000000000000286 R12: 00000000004019b0 [ 75.085479] R13: 0000000000401a40 R14: 0000000000000000 R15: 0000000000000000 [ 75.092753] [ 75.094382] Local variable description: ----args.i@keyctl_pkey_params_get [ 75.101290] Variable was created at: [ 75.105001] keyctl_pkey_params_get+0xaa/0x7d0 [ 75.109577] keyctl_pkey_verify+0x2e2/0x890 [ 75.113901] ================================================================== [ 75.121244] Disabling lock debugging due to kernel taint [ 75.126683] Kernel panic - not syncing: panic_on_warn set ... [ 75.132562] CPU: 0 PID: 6781 Comm: syz-executor808 Tainted: G B 4.20.0-rc2+ #88 [ 75.141305] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 75.150648] Call Trace: [ 75.153252] dump_stack+0x32d/0x480 [ 75.156916] panic+0x624/0xc08 [ 75.160133] kmsan_report+0x300/0x300 [ 75.163950] __msan_warning+0x76/0xc0 [ 75.167763] keyctl_pkey_params_get+0x29c/0x7d0 [ 75.172444] keyctl_pkey_verify+0x2e2/0x890 [ 75.176778] __se_sys_keyctl+0x112c/0x1af0 [ 75.181015] ? prepare_exit_to_usermode+0x182/0x4c0 [ 75.186032] ? syscall_return_slowpath+0xed/0x730 [ 75.190880] ? __msan_get_context_state+0x9/0x20 [ 75.195634] __x64_sys_keyctl+0x62/0x80 [ 75.199617] do_syscall_64+0xcf/0x110 [ 75.203412] entry_SYSCALL_64_after_hwframe+0x63/0xe7 [ 75.208599] RIP: 0033:0x440129 [ 75.211812] 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 [ 75.230751] RSP: 002b:00007ffdb5c1f8d8 EFLAGS: 00000286 ORIG_RAX: 00000000000000fa [ 75.238446] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440129 [ 75.245704] RDX: 00000000200002c0 RSI: 00000000200000c0 RDI: 000000000000001c [ 75.252961] RBP: 00000000006ca018 R08: 0000000020000380 R09: 0000000000000000 [ 75.260218] R10: 00000000fffffd2a R11: 0000000000000286 R12: 00000000004019b0 [ 75.267474] R13: 0000000000401a40 R14: 0000000000000000 R15: 0000000000000000 [ 75.275661] Kernel Offset: disabled [ 75.279303] Rebooting in 86400 seconds..