[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c.
[....] Starting OpenBSD Secure Shell server: sshd[   34.262687] random: sshd: uninitialized urandom read (32 bytes read)
[?25l[?1c7[ ok 8[?25h[?0c.

Debian GNU/Linux 7 syzkaller ttyS0

syzkaller login: [   38.092441] random: sshd: uninitialized urandom read (32 bytes read)
[   38.382638] random: sshd: uninitialized urandom read (32 bytes read)
[   39.787154] random: sshd: uninitialized urandom read (32 bytes read)
[   55.285380] random: sshd: uninitialized urandom read (32 bytes read)
Warning: Permanently added '10.128.10.62' (ECDSA) to the list of known hosts.
[   60.851487] random: sshd: uninitialized urandom read (32 bytes read)
executing program
[   61.991491] ==================================================================
[   61.998891] BUG: KMSAN: kernel-infoleak in snd_pcm_oss_read+0x7cf/0x1b80
[   62.005720] CPU: 1 PID: 4616 Comm: syz-executor518 Not tainted 4.18.0-rc4+ #26
[   62.013054] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   62.022384] Call Trace:
[   62.024961]  dump_stack+0x185/0x1e0
[   62.028576]  kmsan_report+0x195/0x2c0
[   62.032380]  kmsan_internal_check_memory+0x18e/0x210
[   62.037481]  kmsan_copy_to_user+0x83/0xe0
[   62.041621]  snd_pcm_oss_read+0x7cf/0x1b80
[   62.045893]  do_iter_read+0xb87/0xd80
[   62.049678]  ? snd_pcm_oss_unregister_minor+0x4d0/0x4d0
[   62.055067]  do_readv+0x2aa/0x630
[   62.058516]  __x64_sys_readv+0xe1/0x120
[   62.062476]  ? vfs_readv+0x290/0x290
[   62.066171]  do_syscall_64+0x15b/0x230
[   62.070045]  entry_SYSCALL_64_after_hwframe+0x63/0xe7
[   62.075214] RIP: 0033:0x440099
[   62.078379] 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 
[   62.097528] RSP: 002b:00007fff7c36cd08 EFLAGS: 00000213 ORIG_RAX: 0000000000000013
[   62.105224] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440099
[   62.112472] RDX: 0000000000000005 RSI: 00000000200011c0 RDI: 0000000000000003
[   62.119722] RBP: 00000000006ca018 R08: 00000000004002c8 R09: 00000000004002c8
[   62.126973] R10: 0000000000000000 R11: 0000000000000213 R12: 0000000000401920
[   62.134221] R13: 00000000004019b0 R14: 0000000000000000 R15: 0000000000000000
[   62.141476] 
[   62.143092] Uninit was created at:
[   62.146615]  kmsan_internal_alloc_meta_for_pages+0x157/0x730
[   62.152393]  kmsan_alloc_page+0x80/0xe0
[   62.156347]  __alloc_pages_nodemask+0x105b/0x6320
[   62.161176]  alloc_pages_current+0x6b1/0x970
[   62.165571]  __vmalloc_node_range+0x8bf/0x1170
[   62.170138]  vmalloc+0xd8/0xf0
[   62.173309]  snd_pcm_oss_change_params_locked+0x6597/0x6bf0
[   62.179006]  snd_pcm_oss_read+0x4d0/0x1b80
[   62.183220]  do_iter_read+0x884/0xd80
[   62.186999]  do_readv+0x2aa/0x630
[   62.190433]  __x64_sys_readv+0xe1/0x120
[   62.194397]  do_syscall_64+0x15b/0x230
[   62.198267]  entry_SYSCALL_64_after_hwframe+0x63/0xe7
[   62.203437] 
[   62.205049] Bytes 0-60 of 61 are uninitialized
[   62.209618] Memory access starts at ffffc900018ab000
[   62.214691] ==================================================================
[   62.222026] Disabling lock debugging due to kernel taint
[   62.227459] Kernel panic - not syncing: panic_on_warn set ...
[   62.227459] 
[   62.234804] CPU: 1 PID: 4616 Comm: syz-executor518 Tainted: G    B             4.18.0-rc4+ #26
[   62.243539] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   62.252876] Call Trace:
[   62.255448]  dump_stack+0x185/0x1e0
[   62.259060]  panic+0x3d0/0x9b0
[   62.262244]  kmsan_report+0x2bf/0x2c0
[   62.266035]  kmsan_internal_check_memory+0x18e/0x210
[   62.271123]  kmsan_copy_to_user+0x83/0xe0
[   62.275255]  snd_pcm_oss_read+0x7cf/0x1b80
[   62.279479]  do_iter_read+0xb87/0xd80
[   62.283261]  ? snd_pcm_oss_unregister_minor+0x4d0/0x4d0
[   62.288615]  do_readv+0x2aa/0x630
[   62.292075]  __x64_sys_readv+0xe1/0x120
[   62.296046]  ? vfs_readv+0x290/0x290
[   62.299738]  do_syscall_64+0x15b/0x230
[   62.303609]  entry_SYSCALL_64_after_hwframe+0x63/0xe7
[   62.308789] RIP: 0033:0x440099
[   62.311957] 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 
[   62.331120] RSP: 002b:00007fff7c36cd08 EFLAGS: 00000213 ORIG_RAX: 0000000000000013
[   62.338806] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440099
[   62.346054] RDX: 0000000000000005 RSI: 00000000200011c0 RDI: 0000000000000003
[   62.353306] RBP: 00000000006ca018 R08: 00000000004002c8 R09: 00000000004002c8
[   62.360555] R10: 0000000000000000 R11: 0000000000000213 R12: 0000000000401920
[   62.367804] R13: 00000000004019b0 R14: 0000000000000000 R15: 0000000000000000
[   62.375471] Dumping ftrace buffer:
[   62.378997]    (ftrace buffer empty)
[   62.382687] Kernel Offset: disabled
[   62.386294] Rebooting in 86400 seconds..