[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 63.952213] audit: type=1800 audit(1546799517.001:25): pid=9874 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 63.971254] audit: type=1800 audit(1546799517.001:26): pid=9874 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 63.990662] audit: type=1800 audit(1546799517.001:27): pid=9874 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 '10.128.10.63' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 76.379127] ================================================================== [ 76.386641] BUG: KMSAN: uninit-value in capi_write+0x791/0xa90 [ 76.392597] CPU: 0 PID: 10025 Comm: syz-executor379 Not tainted 4.20.0-rc7+ #2 [ 76.399932] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 76.409271] Call Trace: [ 76.411863] dump_stack+0x173/0x1d0 [ 76.415519] kmsan_report+0x12e/0x2a0 [ 76.419311] __msan_warning+0x82/0xf0 [ 76.423109] capi_write+0x791/0xa90 [ 76.426735] do_iter_write+0x83e/0xd80 [ 76.430609] ? __msan_metadata_ptr_for_store_8+0x13/0x20 [ 76.436071] ? capi_read+0x790/0x790 [ 76.439949] do_writev+0x397/0x840 [ 76.443487] ? __msan_metadata_ptr_for_store_4+0x13/0x20 [ 76.448922] ? prepare_exit_to_usermode+0x114/0x420 [ 76.453927] ? syscall_return_slowpath+0x50/0x650 [ 76.458762] __se_sys_writev+0x9b/0xb0 [ 76.462637] __x64_sys_writev+0x4a/0x70 [ 76.466610] do_syscall_64+0xbc/0xf0 [ 76.470330] entry_SYSCALL_64_after_hwframe+0x63/0xe7 [ 76.475500] RIP: 0033:0x440079 [ 76.478674] 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 [ 76.497578] RSP: 002b:00007ffd84911358 EFLAGS: 00000207 ORIG_RAX: 0000000000000014 [ 76.505275] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440079 [ 76.512527] RDX: 0000000000000001 RSI: 0000000020000180 RDI: 0000000000000003 [ 76.519794] RBP: 00000000006ca018 R08: 00000000004002c8 R09: 00000000004002c8 [ 76.527049] R10: 0000000000000000 R11: 0000000000000207 R12: 0000000000401900 [ 76.534304] R13: 0000000000401990 R14: 0000000000000000 R15: 0000000000000000 [ 76.541563] [ 76.543167] Uninit was created at: [ 76.546710] kmsan_internal_poison_shadow+0x92/0x150 [ 76.551807] kmsan_kmalloc+0xa6/0x130 [ 76.555600] kmsan_slab_alloc+0xe/0x10 [ 76.559470] __kmalloc_node_track_caller+0xe18/0x1030 [ 76.564643] __alloc_skb+0x309/0xa20 [ 76.568342] capi_write+0x12f/0xa90 [ 76.571966] do_iter_write+0x83e/0xd80 [ 76.575839] do_writev+0x397/0x840 [ 76.579362] __se_sys_writev+0x9b/0xb0 [ 76.583228] __x64_sys_writev+0x4a/0x70 [ 76.587186] do_syscall_64+0xbc/0xf0 [ 76.590882] entry_SYSCALL_64_after_hwframe+0x63/0xe7 [ 76.596068] ================================================================== [ 76.603401] Disabling lock debugging due to kernel taint [ 76.608826] Kernel panic - not syncing: panic_on_warn set ... [ 76.614812] CPU: 0 PID: 10025 Comm: syz-executor379 Tainted: G B 4.20.0-rc7+ #2 [ 76.623539] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 76.632871] Call Trace: [ 76.635448] dump_stack+0x173/0x1d0 [ 76.639062] panic+0x3ce/0x961 [ 76.642248] kmsan_report+0x293/0x2a0 [ 76.646039] __msan_warning+0x82/0xf0 [ 76.649823] capi_write+0x791/0xa90 [ 76.653441] do_iter_write+0x83e/0xd80 [ 76.657311] ? __msan_metadata_ptr_for_store_8+0x13/0x20 [ 76.662768] ? capi_read+0x790/0x790 [ 76.666466] do_writev+0x397/0x840 [ 76.670001] ? __msan_metadata_ptr_for_store_4+0x13/0x20 [ 76.675435] ? prepare_exit_to_usermode+0x114/0x420 [ 76.680431] ? syscall_return_slowpath+0x50/0x650 [ 76.685274] __se_sys_writev+0x9b/0xb0 [ 76.689147] __x64_sys_writev+0x4a/0x70 [ 76.693102] do_syscall_64+0xbc/0xf0 [ 76.696800] entry_SYSCALL_64_after_hwframe+0x63/0xe7 [ 76.701982] RIP: 0033:0x440079 [ 76.705155] 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 [ 76.724051] RSP: 002b:00007ffd84911358 EFLAGS: 00000207 ORIG_RAX: 0000000000000014 [ 76.731743] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440079 [ 76.739010] RDX: 0000000000000001 RSI: 0000000020000180 RDI: 0000000000000003 [ 76.746269] RBP: 00000000006ca018 R08: 00000000004002c8 R09: 00000000004002c8 [ 76.753522] R10: 0000000000000000 R11: 0000000000000207 R12: 0000000000401900 [ 76.760775] R13: 0000000000401990 R14: 0000000000000000 R15: 0000000000000000 [ 76.769161] Kernel Offset: disabled [ 76.772783] Rebooting in 86400 seconds..