[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 84.857958] audit: type=1800 audit(1556840454.915:25): pid=10329 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 84.888045] audit: type=1800 audit(1556840454.945:26): pid=10329 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 84.923874] audit: type=1800 audit(1556840454.975:27): pid=10329 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 '10.128.0.196' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 98.417327] IPVS: ftp: loaded support on port[0] = 21 [ 98.465914] ================================================================== [ 98.473315] BUG: KMSAN: uninit-value in bcmp+0x117/0x180 [ 98.478764] CPU: 1 PID: 10480 Comm: syz-executor472 Not tainted 5.1.0-rc7+ #5 [ 98.486051] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 98.495406] Call Trace: [ 98.498003] dump_stack+0x191/0x1f0 [ 98.501664] kmsan_report+0x130/0x2a0 [ 98.505507] __msan_warning+0x75/0xe0 [ 98.509319] bcmp+0x117/0x180 [ 98.512443] __dev_mc_del+0x16c/0x690 [ 98.516259] dev_mc_del+0x6d/0x80 [ 98.519721] __igmp_group_dropped+0x260/0x1320 [ 98.524328] ? kmsan_get_shadow_origin_ptr+0x71/0x470 [ 98.529534] ip_mc_down+0x1e7/0x3b0 [ 98.533173] inetdev_event+0x22d/0x1df0 [ 98.537161] ? ipv4_doint_and_flush+0x280/0x280 [ 98.541860] ? kmsan_get_shadow_origin_ptr+0x71/0x470 [ 98.547073] ? arp_netdev_event+0xeb/0x250 [ 98.551367] ? ipv4_doint_and_flush+0x280/0x280 [ 98.556052] ? ipv4_doint_and_flush+0x280/0x280 [ 98.560752] raw_notifier_call_chain+0x13d/0x240 [ 98.565556] dev_close_many+0x60d/0x9e0 [ 98.569598] rollback_registered_many+0x94a/0x2210 [ 98.574554] ? kmsan_get_shadow_origin_ptr+0x71/0x470 [ 98.579757] unregister_netdevice_queue+0x593/0xab0 [ 98.584819] __tun_detach+0x21be/0x2b10 [ 98.589687] tun_chr_close+0xda/0x1c0 [ 98.593498] ? tun_chr_open+0x770/0x770 [ 98.597474] __fput+0x4d1/0xbc0 [ 98.600772] ____fput+0x37/0x40 [ 98.604069] ? fput_many+0x2a0/0x2a0 [ 98.607790] task_work_run+0x22e/0x2a0 [ 98.618750] prepare_exit_to_usermode+0x31d/0x420 [ 98.623608] syscall_return_slowpath+0x90/0x5c0 [ 98.628287] ? kmsan_get_shadow_origin_ptr+0x71/0x470 [ 98.633483] do_syscall_64+0xe2/0xf0 [ 98.637195] entry_SYSCALL_64_after_hwframe+0x63/0xe7 [ 98.642387] RIP: 0033:0x400f00 [ 98.645569] Code: 01 f0 ff ff 0f 83 20 0c 00 00 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 83 3d cd 17 2d 00 00 75 14 b8 03 00 00 00 0f 05 <48> 3d 01 f0 ff ff 0f 83 f4 0b 00 00 c3 48 83 ec 08 e8 5a 01 00 00 [ 98.664493] RSP: 002b:00007fff995e0ec8 EFLAGS: 00000246 ORIG_RAX: 0000000000000003 [ 98.672226] RAX: 0000000000000000 RBX: 0000000000000005 RCX: 0000000000400f00 [ 98.679491] RDX: 0000000020000c40 RSI: 0000000000008914 RDI: 0000000000000004 [ 98.686757] RBP: 00000000004a2470 R08: 0000000000000100 R09: 0000000000000100 [ 98.694037] R10: 0000000000000100 R11: 0000000000000246 R12: 0000000000401f80 [ 98.701301] R13: 0000000000402010 R14: 0000000000000000 R15: 0000000000000000 [ 98.708576] [ 98.710190] Local variable description: ----buf.i@__igmp_group_dropped [ 98.716837] Variable was created at: [ 98.720547] __igmp_group_dropped+0x170/0x1320 [ 98.725123] ip_mc_down+0x1e7/0x3b0 [ 98.728735] ================================================================== [ 98.736075] Disabling lock debugging due to kernel taint [ 98.741512] Kernel panic - not syncing: panic_on_warn set ... [ 98.747414] CPU: 1 PID: 10480 Comm: syz-executor472 Tainted: G B 5.1.0-rc7+ #5 [ 98.756072] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 98.765418] Call Trace: [ 98.768005] dump_stack+0x191/0x1f0 [ 98.771642] panic+0x3ca/0xafe [ 98.774880] kmsan_report+0x298/0x2a0 [ 98.778680] __msan_warning+0x75/0xe0 [ 98.782481] bcmp+0x117/0x180 [ 98.785588] __dev_mc_del+0x16c/0x690 [ 98.789396] dev_mc_del+0x6d/0x80 [ 98.792872] __igmp_group_dropped+0x260/0x1320 [ 98.797469] ? kmsan_get_shadow_origin_ptr+0x71/0x470 [ 98.802680] ip_mc_down+0x1e7/0x3b0 [ 98.806316] inetdev_event+0x22d/0x1df0 [ 98.810383] ? ipv4_doint_and_flush+0x280/0x280 [ 98.815051] ? kmsan_get_shadow_origin_ptr+0x71/0x470 [ 98.820237] ? arp_netdev_event+0xeb/0x250 [ 98.824472] ? ipv4_doint_and_flush+0x280/0x280 [ 98.829158] ? ipv4_doint_and_flush+0x280/0x280 [ 98.833828] raw_notifier_call_chain+0x13d/0x240 [ 98.838604] dev_close_many+0x60d/0x9e0 [ 98.842593] rollback_registered_many+0x94a/0x2210 [ 98.847553] ? kmsan_get_shadow_origin_ptr+0x71/0x470 [ 98.852777] unregister_netdevice_queue+0x593/0xab0 [ 98.857821] __tun_detach+0x21be/0x2b10 [ 98.861847] tun_chr_close+0xda/0x1c0 [ 98.865660] ? tun_chr_open+0x770/0x770 [ 98.869632] __fput+0x4d1/0xbc0 [ 98.872927] ____fput+0x37/0x40 [ 98.876197] ? fput_many+0x2a0/0x2a0 [ 98.879903] task_work_run+0x22e/0x2a0 [ 98.883797] prepare_exit_to_usermode+0x31d/0x420 [ 98.888648] syscall_return_slowpath+0x90/0x5c0 [ 98.893326] ? kmsan_get_shadow_origin_ptr+0x71/0x470 [ 98.898516] do_syscall_64+0xe2/0xf0 [ 98.902229] entry_SYSCALL_64_after_hwframe+0x63/0xe7 [ 98.907410] RIP: 0033:0x400f00 [ 98.910591] Code: 01 f0 ff ff 0f 83 20 0c 00 00 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 83 3d cd 17 2d 00 00 75 14 b8 03 00 00 00 0f 05 <48> 3d 01 f0 ff ff 0f 83 f4 0b 00 00 c3 48 83 ec 08 e8 5a 01 00 00 [ 98.929504] RSP: 002b:00007fff995e0ec8 EFLAGS: 00000246 ORIG_RAX: 0000000000000003 [ 98.937222] RAX: 0000000000000000 RBX: 0000000000000005 RCX: 0000000000400f00 [ 98.944511] RDX: 0000000020000c40 RSI: 0000000000008914 RDI: 0000000000000004 [ 98.951781] RBP: 00000000004a2470 R08: 0000000000000100 R09: 0000000000000100 [ 98.959043] R10: 0000000000000100 R11: 0000000000000246 R12: 0000000000401f80 [ 98.966303] R13: 0000000000402010 R14: 0000000000000000 R15: 0000000000000000 [ 98.974602] Kernel Offset: disabled [ 98.978236] Rebooting in 86400 seconds..