[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c.
[....] Starting OpenBSD Secure Shell server: sshd[   35.522668] random: sshd: uninitialized urandom read (32 bytes read)
[?25l[?1c7[ ok 8[?25h[?0c.

Debian GNU/Linux 7 syzkaller ttyS0

syzkaller login: [   40.273133] random: sshd: uninitialized urandom read (32 bytes read)
[   40.897464] random: sshd: uninitialized urandom read (32 bytes read)
[   42.122379] random: sshd: uninitialized urandom read (32 bytes read)
[   42.354437] random: sshd: uninitialized urandom read (32 bytes read)
Warning: Permanently added '10.128.10.55' (ECDSA) to the list of known hosts.
[   47.985309] random: sshd: uninitialized urandom read (32 bytes read)
executing program
[   48.114342] IPVS: ftp: loaded support on port[0] = 21
[   48.152810] ==================================================================
[   48.160238] BUG: KMSAN: uninit-value in memcmp+0x119/0x180
[   48.165894] CPU: 0 PID: 38 Comm: kworker/0:1 Not tainted 4.17.0-rc3+ #88
[   48.172733] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   48.182131] Workqueue: ipv6_addrconf addrconf_dad_work
[   48.187409] Call Trace:
[   48.189996]  dump_stack+0x185/0x1d0
[   48.193621]  ? memcmp+0x119/0x180
[   48.197074]  kmsan_report+0x142/0x240
[   48.200879]  __msan_warning_32+0x6c/0xb0
[   48.205150]  memcmp+0x119/0x180
[   48.208438]  __dev_mc_add+0x1fc/0x900
[   48.212233]  ? ndisc_mc_map+0x59f/0x8c0
[   48.216201]  dev_mc_add+0x6d/0x80
[   48.219653]  igmp6_group_added+0x2db/0xa00
[   48.223875]  ipv6_dev_mc_inc+0xe9e/0x1130
[   48.228032]  addrconf_dad_work+0x462/0x2a20
[   48.232347]  ? ipv6_get_saddr_eval+0x1450/0x1450
[   48.237092]  process_one_work+0x12c6/0x1f60
[   48.241421]  worker_thread+0x113c/0x24f0
[   48.245474]  ? process_one_work+0x1f60/0x1f60
[   48.249969]  kthread+0x539/0x720
[   48.253337]  ? process_one_work+0x1f60/0x1f60
[   48.257823]  ? kthread_blkcg+0xf0/0xf0
[   48.261697]  ret_from_fork+0x35/0x40
[   48.265390] 
[   48.267016] Local variable description: ----buf@igmp6_group_added
[   48.273236] Variable was created at:
[   48.276951]  igmp6_group_added+0x4a/0xa00
[   48.281117]  ipv6_dev_mc_inc+0xe9e/0x1130
[   48.285263] ==================================================================
[   48.292616] Disabling lock debugging due to kernel taint
[   48.298056] Kernel panic - not syncing: panic_on_warn set ...
[   48.298056] 
[   48.305420] CPU: 0 PID: 38 Comm: kworker/0:1 Tainted: G    B             4.17.0-rc3+ #88
[   48.313640] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   48.323018] Workqueue: ipv6_addrconf addrconf_dad_work
[   48.328301] Call Trace:
[   48.330888]  dump_stack+0x185/0x1d0
[   48.334515]  panic+0x39d/0x940
[   48.337731]  ? memcmp+0x119/0x180
[   48.341176]  kmsan_report+0x238/0x240
[   48.344970]  __msan_warning_32+0x6c/0xb0
[   48.349026]  memcmp+0x119/0x180
[   48.352319]  __dev_mc_add+0x1fc/0x900
[   48.356122]  ? ndisc_mc_map+0x59f/0x8c0
[   48.360106]  dev_mc_add+0x6d/0x80
[   48.363560]  igmp6_group_added+0x2db/0xa00
[   48.367784]  ipv6_dev_mc_inc+0xe9e/0x1130
[   48.371925]  addrconf_dad_work+0x462/0x2a20
[   48.376237]  ? ipv6_get_saddr_eval+0x1450/0x1450
[   48.380980]  process_one_work+0x12c6/0x1f60
[   48.385294]  worker_thread+0x113c/0x24f0
[   48.389347]  ? process_one_work+0x1f60/0x1f60
[   48.393830]  kthread+0x539/0x720
[   48.397196]  ? process_one_work+0x1f60/0x1f60
[   48.401691]  ? kthread_blkcg+0xf0/0xf0
[   48.405568]  ret_from_fork+0x35/0x40
[   48.409910] Dumping ftrace buffer:
[   48.413450]    (ftrace buffer empty)
[   48.417142] Kernel Offset: disabled
[   48.420752] Rebooting in 86400 seconds..