[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c.
[....] Starting OpenBSD Secure Shell server: sshd[   33.925508] random: sshd: uninitialized urandom read (32 bytes read)
[?25l[?1c7[ ok 8[?25h[?0c.

Debian GNU/Linux 7 syzkaller ttyS0

syzkaller login: [   38.577359] random: sshd: uninitialized urandom read (32 bytes read)
[   39.058981] random: sshd: uninitialized urandom read (32 bytes read)
[   40.386193] random: sshd: uninitialized urandom read (32 bytes read)
[   40.612304] random: sshd: uninitialized urandom read (32 bytes read)
Warning: Permanently added '10.128.0.49' (ECDSA) to the list of known hosts.
[   46.225578] random: sshd: uninitialized urandom read (32 bytes read)
executing program
[   46.862400] ==================================================================
[   46.869809] BUG: KMSAN: kernel-infoleak in snd_pcm_oss_read+0x78b/0x1b30
[   46.876635] CPU: 0 PID: 4579 Comm: syz-executor061 Not tainted 4.17.0+ #22
[   46.883909] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   46.893286] Call Trace:
[   46.895889]  dump_stack+0x185/0x1d0
[   46.899520]  kmsan_report+0x188/0x2a0
[   46.903309]  kmsan_internal_check_memory+0x17e/0x1f0
[   46.908401]  kmsan_copy_to_user+0x73/0xb0
[   46.912636]  snd_pcm_oss_read+0x78b/0x1b30
[   46.916882]  ? snd_pcm_oss_unregister_minor+0x4d0/0x4d0
[   46.922264]  __vfs_read+0x1b2/0x9d0
[   46.925893]  vfs_read+0x36c/0x6b0
[   46.929340]  __x64_sys_read+0x1bf/0x3e0
[   46.933316]  ? ksys_read+0x360/0x360
[   46.937404]  do_syscall_64+0x15b/0x230
[   46.941282]  entry_SYSCALL_64_after_hwframe+0x63/0xe7
[   46.946457] RIP: 0033:0x440049
[   46.949630] RSP: 002b:00007fffbbad5c18 EFLAGS: 00000203 ORIG_RAX: 0000000000000000
[   46.957323] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440049
[   46.964575] RDX: 00000000000000fa RSI: 0000000020000300 RDI: 0000000000000003
[   46.971829] RBP: 00000000006ca018 R08: 00000000004002c8 R09: 00000000004002c8
[   46.979358] R10: 00000000004002c8 R11: 0000000000000203 R12: 00000000004018d0
[   46.986626] R13: 0000000000401960 R14: 0000000000000000 R15: 0000000000000000
[   46.993896] 
[   46.995518] Uninit was created at:
[   46.999082]  kmsan_internal_alloc_meta_for_pages+0x146/0x700
[   47.004870]  kmsan_alloc_page+0x75/0xd0
[   47.008842]  __alloc_pages_nodemask+0xf7b/0x5cc0
[   47.013605]  alloc_pages_current+0x6b1/0x970
[   47.018003]  __vmalloc_node_range+0x8bf/0x1170
[   47.022674]  vmalloc+0xd8/0xf0
[   47.025859]  snd_pcm_oss_change_params_locked+0x631b/0x6940
[   47.031570]  snd_pcm_oss_read+0x4ad/0x1b30
[   47.035823]  __vfs_read+0x1b2/0x9d0
[   47.039439]  vfs_read+0x36c/0x6b0
[   47.042883]  __x64_sys_read+0x1bf/0x3e0
[   47.046844]  do_syscall_64+0x15b/0x230
[   47.050717]  entry_SYSCALL_64_after_hwframe+0x63/0xe7
[   47.055891] 
[   47.057502] Bytes 0-249 of 250 are uninitialized
[   47.062238] Memory access starts at ffffc90001893000
[   47.067330] ==================================================================
[   47.074680] Disabling lock debugging due to kernel taint
[   47.080112] Kernel panic - not syncing: panic_on_warn set ...
[   47.080112] 
[   47.087483] CPU: 0 PID: 4579 Comm: syz-executor061 Tainted: G    B             4.17.0+ #22
[   47.095877] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   47.105222] Call Trace:
[   47.107802]  dump_stack+0x185/0x1d0
[   47.111468]  panic+0x3d0/0x9b0
[   47.114670]  kmsan_report+0x29e/0x2a0
[   47.118467]  kmsan_internal_check_memory+0x17e/0x1f0
[   47.123563]  kmsan_copy_to_user+0x73/0xb0
[   47.127708]  snd_pcm_oss_read+0x78b/0x1b30
[   47.131940]  ? snd_pcm_oss_unregister_minor+0x4d0/0x4d0
[   47.137301]  __vfs_read+0x1b2/0x9d0
[   47.140928]  vfs_read+0x36c/0x6b0
[   47.144386]  __x64_sys_read+0x1bf/0x3e0
[   47.148357]  ? ksys_read+0x360/0x360
[   47.152074]  do_syscall_64+0x15b/0x230
[   47.156001]  entry_SYSCALL_64_after_hwframe+0x63/0xe7
[   47.161194] RIP: 0033:0x440049
[   47.164367] RSP: 002b:00007fffbbad5c18 EFLAGS: 00000203 ORIG_RAX: 0000000000000000
[   47.172067] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440049
[   47.179324] RDX: 00000000000000fa RSI: 0000000020000300 RDI: 0000000000000003
[   47.186582] RBP: 00000000006ca018 R08: 00000000004002c8 R09: 00000000004002c8
[   47.193840] R10: 00000000004002c8 R11: 0000000000000203 R12: 00000000004018d0
[   47.201118] R13: 0000000000401960 R14: 0000000000000000 R15: 0000000000000000
[   47.209162] Dumping ftrace buffer:
[   47.212694]    (ftrace buffer empty)
[   47.216395] Kernel Offset: disabled
[   47.220006] Rebooting in 86400 seconds..