[ 56.414654] audit: type=1800 audit(1540168974.477:25): pid=6061 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 56.433708] audit: type=1800 audit(1540168974.477:26): pid=6061 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 56.453128] audit: type=1800 audit(1540168974.497:27): pid=6061 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. [ 57.743996] sshd (6129) used greatest stack depth: 53504 bytes left [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.0.120' (ECDSA) to the list of known hosts. executing program executing program syzkaller login: [ 68.686739] ================================================================== [ 68.694192] BUG: KMSAN: uninit-value in memcmp+0x117/0x180 [ 68.699815] CPU: 1 PID: 6214 Comm: syz-executor693 Not tainted 4.19.0-rc8+ #70 [ 68.707167] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 68.716509] Call Trace: [ 68.719096] dump_stack+0x306/0x460 [ 68.722721] ? memcmp+0x117/0x180 [ 68.726184] kmsan_report+0x1a2/0x2e0 [ 68.730003] __msan_warning+0x7c/0xe0 [ 68.733827] memcmp+0x117/0x180 [ 68.737133] dev_mc_add_excl+0x165/0x770 [ 68.741203] rtnl_fdb_add+0xe83/0x12a0 [ 68.745133] ? rtnl_dump_all+0x540/0x540 [ 68.749206] rtnetlink_rcv_msg+0xa53/0x1590 [ 68.753548] ? netlink_sendmsg+0xcaf/0x1420 [ 68.757869] ? do_syscall_64+0xbe/0x100 [ 68.761852] ? entry_SYSCALL_64_after_hwframe+0x63/0xe7 [ 68.767211] ? kmsan_set_origin_inline+0x6b/0x120 [ 68.772080] ? __msan_poison_alloca+0x17a/0x210 [ 68.776793] ? __local_bh_enable_ip+0x44/0x170 [ 68.781406] ? kmsan_set_origin_inline+0x6b/0x120 [ 68.786252] ? kmsan_set_origin+0x83/0x140 [ 68.790497] netlink_rcv_skb+0x394/0x640 [ 68.794576] ? rtnetlink_bind+0x120/0x120 [ 68.798774] rtnetlink_rcv+0x50/0x60 [ 68.802493] netlink_unicast+0x166d/0x1720 [ 68.806733] ? rtnetlink_net_exit+0x90/0x90 [ 68.811076] netlink_sendmsg+0x1391/0x1420 [ 68.815336] ___sys_sendmsg+0xe47/0x1200 [ 68.819418] ? netlink_getsockopt+0x1560/0x1560 [ 68.824134] ? __msan_poison_alloca+0x17a/0x210 [ 68.828853] ? __msan_metadata_ptr_for_load_4+0x10/0x20 [ 68.834229] ? __fdget+0x22b/0x430 [ 68.837786] __se_sys_sendmsg+0x307/0x460 [ 68.841964] __x64_sys_sendmsg+0x4a/0x70 [ 68.846025] do_syscall_64+0xbe/0x100 [ 68.849834] entry_SYSCALL_64_after_hwframe+0x63/0xe7 [ 68.855018] RIP: 0033:0x440fd9 [ 68.858210] Code: e8 cc ab 02 00 48 83 c4 18 c3 0f 1f 80 00 00 00 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 bb 0a fc ff c3 66 2e 0f 1f 84 00 00 00 00 [ 68.877122] RSP: 002b:00007ffe833197b8 EFLAGS: 00000213 ORIG_RAX: 000000000000002e [ 68.884851] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000440fd9 [ 68.892114] RDX: 0000000000000000 RSI: 0000000020000500 RDI: 0000000000000003 [ 68.899385] RBP: 0000000000000000 R08: 00000000004002c8 R09: 00000000004002c8 [ 68.906647] R10: 00000000004002c8 R11: 0000000000000213 R12: 0000000000010c7d [ 68.913908] R13: 0000000000401fb0 R14: 0000000000000000 R15: 0000000000000000 [ 68.921190] [ 68.922810] Uninit was created at: [ 68.926361] kmsan_internal_poison_shadow+0xc8/0x1d0 [ 68.931474] kmsan_kmalloc+0xa4/0x120 [ 68.935291] kmsan_slab_alloc+0x10/0x20 [ 68.939274] __kmalloc_node_track_caller+0xb43/0x1400 [ 68.944463] __alloc_skb+0x422/0xe90 [ 68.948193] netlink_sendmsg+0xcaf/0x1420 [ 68.952353] ___sys_sendmsg+0xe47/0x1200 [ 68.956420] __se_sys_sendmsg+0x307/0x460 [ 68.960578] __x64_sys_sendmsg+0x4a/0x70 [ 68.964648] do_syscall_64+0xbe/0x100 [ 68.968462] entry_SYSCALL_64_after_hwframe+0x63/0xe7 [ 68.973637] ================================================================== [ 68.980982] Disabling lock debugging due to kernel taint [ 68.986424] Kernel panic - not syncing: panic_on_warn set ... [ 68.986424] [ 68.993797] CPU: 1 PID: 6214 Comm: syz-executor693 Tainted: G B 4.19.0-rc8+ #70 [ 69.002557] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 69.011916] Call Trace: [ 69.014521] dump_stack+0x306/0x460 [ 69.018166] panic+0x54c/0xafa [ 69.021402] ? __msan_metadata_ptr_for_store_1+0x13/0x20 [ 69.026857] kmsan_report+0x2d3/0x2e0 [ 69.030680] __msan_warning+0x7c/0xe0 [ 69.034521] memcmp+0x117/0x180 [ 69.037825] dev_mc_add_excl+0x165/0x770 [ 69.041897] rtnl_fdb_add+0xe83/0x12a0 [ 69.045829] ? rtnl_dump_all+0x540/0x540 [ 69.049901] rtnetlink_rcv_msg+0xa53/0x1590 [ 69.054250] ? netlink_sendmsg+0xcaf/0x1420 [ 69.058573] ? do_syscall_64+0xbe/0x100 [ 69.062545] ? entry_SYSCALL_64_after_hwframe+0x63/0xe7 [ 69.067905] ? kmsan_set_origin_inline+0x6b/0x120 [ 69.072748] ? __msan_poison_alloca+0x17a/0x210 [ 69.077435] ? __local_bh_enable_ip+0x44/0x170 [ 69.082020] ? kmsan_set_origin_inline+0x6b/0x120 [ 69.086867] ? kmsan_set_origin+0x83/0x140 [ 69.091176] netlink_rcv_skb+0x394/0x640 [ 69.095254] ? rtnetlink_bind+0x120/0x120 [ 69.099431] rtnetlink_rcv+0x50/0x60 [ 69.103171] netlink_unicast+0x166d/0x1720 [ 69.107416] ? rtnetlink_net_exit+0x90/0x90 [ 69.111752] netlink_sendmsg+0x1391/0x1420 [ 69.116049] ___sys_sendmsg+0xe47/0x1200 [ 69.120148] ? netlink_getsockopt+0x1560/0x1560 [ 69.124831] ? __msan_poison_alloca+0x17a/0x210 [ 69.129510] ? __msan_metadata_ptr_for_load_4+0x10/0x20 [ 69.134883] ? __fdget+0x22b/0x430 [ 69.138452] __se_sys_sendmsg+0x307/0x460 [ 69.142619] __x64_sys_sendmsg+0x4a/0x70 [ 69.146682] do_syscall_64+0xbe/0x100 [ 69.150492] entry_SYSCALL_64_after_hwframe+0x63/0xe7 [ 69.155691] RIP: 0033:0x440fd9 [ 69.158890] Code: e8 cc ab 02 00 48 83 c4 18 c3 0f 1f 80 00 00 00 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 bb 0a fc ff c3 66 2e 0f 1f 84 00 00 00 00 [ 69.177812] RSP: 002b:00007ffe833197b8 EFLAGS: 00000213 ORIG_RAX: 000000000000002e [ 69.185607] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000440fd9 [ 69.192907] RDX: 0000000000000000 RSI: 0000000020000500 RDI: 0000000000000003 [ 69.200187] RBP: 0000000000000000 R08: 00000000004002c8 R09: 00000000004002c8 [ 69.207448] R10: 00000000004002c8 R11: 0000000000000213 R12: 0000000000010c7d [ 69.214729] R13: 0000000000401fb0 R14: 0000000000000000 R15: 0000000000000000 [ 69.222945] Kernel Offset: disabled [ 69.226585] Rebooting in 86400 seconds..