[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 99.848675] audit: type=1800 audit(1552175277.898:25): pid=10708 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 99.868002] audit: type=1800 audit(1552175277.908:26): pid=10708 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 99.887455] audit: type=1800 audit(1552175277.918:27): pid=10708 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 '10.128.0.42' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 110.801407] ================================================================== [ 110.808906] BUG: KMSAN: uninit-value in memchr+0xce/0x110 [ 110.814441] CPU: 1 PID: 10859 Comm: syz-executor141 Not tainted 5.0.0+ #11 [ 110.821436] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 110.830774] Call Trace: [ 110.833364] dump_stack+0x173/0x1d0 [ 110.836990] kmsan_report+0x12e/0x2a0 [ 110.840807] __msan_warning+0x82/0xf0 [ 110.844647] memchr+0xce/0x110 [ 110.847859] tipc_nl_compat_link_set+0x121/0x1550 [ 110.852697] ? kmsan_get_shadow_origin_ptr+0x60/0x440 [ 110.857892] ? tipc_nl_compat_link_dump+0x5f0/0x5f0 [ 110.862909] tipc_nl_compat_doit+0x3aa/0xaf0 [ 110.867314] ? kmsan_get_shadow_origin_ptr+0x60/0x440 [ 110.872521] tipc_nl_compat_recv+0x1ae7/0x2750 [ 110.877112] ? tipc_nl_node_dump+0x1300/0x1300 [ 110.881693] ? tipc_nl_compat_link_dump+0x5f0/0x5f0 [ 110.886719] ? tipc_netlink_compat_stop+0x40/0x40 [ 110.891595] genl_rcv_msg+0x185f/0x1a60 [ 110.895601] netlink_rcv_skb+0x431/0x620 [ 110.899653] ? genl_unbind+0x390/0x390 [ 110.903546] genl_rcv+0x63/0x80 [ 110.906835] netlink_unicast+0xf3e/0x1020 [ 110.910993] netlink_sendmsg+0x127f/0x1300 [ 110.915246] ___sys_sendmsg+0xdb9/0x11b0 [ 110.919307] ? netlink_getsockopt+0x1460/0x1460 [ 110.923979] ? kmsan_get_shadow_origin_ptr+0x60/0x440 [ 110.929165] ? __msan_metadata_ptr_for_load_4+0x10/0x20 [ 110.934523] ? __fget_light+0x1fe/0x750 [ 110.938522] ? kmsan_get_shadow_origin_ptr+0x60/0x440 [ 110.943712] __se_sys_sendmsg+0x305/0x460 [ 110.947878] __x64_sys_sendmsg+0x4a/0x70 [ 110.951943] do_syscall_64+0xbc/0xf0 [ 110.955650] entry_SYSCALL_64_after_hwframe+0x63/0xe7 [ 110.960826] RIP: 0033:0x440109 [ 110.964009] 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 [ 110.982905] RSP: 002b:00007ffdbb8a05f8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e [ 110.990610] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440109 [ 110.997867] RDX: 0000000000000000 RSI: 0000000020000140 RDI: 0000000000000003 [ 111.005126] RBP: 00000000006ca018 R08: 0000000000000000 R09: 00000000004002c8 [ 111.012383] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000401990 [ 111.019641] R13: 0000000000401a20 R14: 0000000000000000 R15: 0000000000000000 [ 111.026912] [ 111.028533] Uninit was created at: [ 111.032069] kmsan_internal_poison_shadow+0x92/0x150 [ 111.037159] kmsan_kmalloc+0xa6/0x130 [ 111.040947] kmsan_slab_alloc+0xe/0x10 [ 111.044827] __kmalloc_node_track_caller+0xe9e/0xff0 [ 111.049941] __alloc_skb+0x309/0xa20 [ 111.053642] netlink_sendmsg+0xb82/0x1300 [ 111.057780] ___sys_sendmsg+0xdb9/0x11b0 [ 111.061841] __se_sys_sendmsg+0x305/0x460 [ 111.066010] __x64_sys_sendmsg+0x4a/0x70 [ 111.070077] do_syscall_64+0xbc/0xf0 [ 111.073786] entry_SYSCALL_64_after_hwframe+0x63/0xe7 [ 111.078972] ================================================================== [ 111.086313] Disabling lock debugging due to kernel taint [ 111.091760] Kernel panic - not syncing: panic_on_warn set ... [ 111.097647] CPU: 1 PID: 10859 Comm: syz-executor141 Tainted: G B 5.0.0+ #11 [ 111.106029] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 111.115371] Call Trace: [ 111.117962] dump_stack+0x173/0x1d0 [ 111.121589] panic+0x3d1/0xb01 [ 111.124813] kmsan_report+0x293/0x2a0 [ 111.128613] __msan_warning+0x82/0xf0 [ 111.132433] memchr+0xce/0x110 [ 111.135640] tipc_nl_compat_link_set+0x121/0x1550 [ 111.140474] ? kmsan_get_shadow_origin_ptr+0x60/0x440 [ 111.145670] ? tipc_nl_compat_link_dump+0x5f0/0x5f0 [ 111.150680] tipc_nl_compat_doit+0x3aa/0xaf0 [ 111.155084] ? kmsan_get_shadow_origin_ptr+0x60/0x440 [ 111.160295] tipc_nl_compat_recv+0x1ae7/0x2750 [ 111.164889] ? tipc_nl_node_dump+0x1300/0x1300 [ 111.169466] ? tipc_nl_compat_link_dump+0x5f0/0x5f0 [ 111.174478] ? tipc_netlink_compat_stop+0x40/0x40 [ 111.179316] genl_rcv_msg+0x185f/0x1a60 [ 111.183327] netlink_rcv_skb+0x431/0x620 [ 111.187377] ? genl_unbind+0x390/0x390 [ 111.191268] genl_rcv+0x63/0x80 [ 111.194572] netlink_unicast+0xf3e/0x1020 [ 111.198734] netlink_sendmsg+0x127f/0x1300 [ 111.202995] ___sys_sendmsg+0xdb9/0x11b0 [ 111.207057] ? netlink_getsockopt+0x1460/0x1460 [ 111.211744] ? kmsan_get_shadow_origin_ptr+0x60/0x440 [ 111.216953] ? __msan_metadata_ptr_for_load_4+0x10/0x20 [ 111.222307] ? __fget_light+0x1fe/0x750 [ 111.226289] ? kmsan_get_shadow_origin_ptr+0x60/0x440 [ 111.231484] __se_sys_sendmsg+0x305/0x460 [ 111.235646] __x64_sys_sendmsg+0x4a/0x70 [ 111.239698] do_syscall_64+0xbc/0xf0 [ 111.243430] entry_SYSCALL_64_after_hwframe+0x63/0xe7 [ 111.248611] RIP: 0033:0x440109 [ 111.251801] 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 [ 111.270696] RSP: 002b:00007ffdbb8a05f8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e [ 111.278390] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440109 [ 111.285647] RDX: 0000000000000000 RSI: 0000000020000140 RDI: 0000000000000003 [ 111.292902] RBP: 00000000006ca018 R08: 0000000000000000 R09: 00000000004002c8 [ 111.300162] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000401990 [ 111.307418] R13: 0000000000401a20 R14: 0000000000000000 R15: 0000000000000000 [ 111.315504] Kernel Offset: disabled [ 111.319138] Rebooting in 86400 seconds..