[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 33.410236] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 36.279834] random: sshd: uninitialized urandom read (32 bytes read) [ 36.790435] random: sshd: uninitialized urandom read (32 bytes read) [ 38.182565] random: sshd: uninitialized urandom read (32 bytes read) [ 38.410833] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.60' (ECDSA) to the list of known hosts. [ 43.991257] random: sshd: uninitialized urandom read (32 bytes read) executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 44.312336] ================================================================== [ 44.319756] BUG: KMSAN: kernel-infoleak in snd_pcm_oss_read+0x7cf/0x1b80 [ 44.326604] CPU: 1 PID: 4583 Comm: syz-executor210 Not tainted 4.18.0-rc4+ #25 [ 44.333961] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 44.343323] Call Trace: [ 44.345927] dump_stack+0x185/0x1e0 [ 44.349566] kmsan_report+0x195/0x2c0 [ 44.353387] kmsan_internal_check_memory+0x18e/0x210 [ 44.358510] kmsan_copy_to_user+0x83/0xe0 [ 44.362675] snd_pcm_oss_read+0x7cf/0x1b80 [ 44.366938] ? snd_pcm_oss_unregister_minor+0x4d0/0x4d0 [ 44.372316] __vfs_read+0x1f0/0xb40 [ 44.375961] ? rw_verify_area+0x35e/0x580 [ 44.380133] vfs_read+0x36c/0x6b0 [ 44.383611] __x64_sys_read+0x1cf/0x400 [ 44.387600] ? ksys_read+0x380/0x380 [ 44.391324] do_syscall_64+0x15b/0x230 [ 44.395227] entry_SYSCALL_64_after_hwframe+0x63/0xe7 [ 44.401825] RIP: 0033:0x441239 [ 44.405018] 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 3b 10 fc ff c3 66 2e 0f 1f 84 00 00 00 00 [ 44.424333] RSP: 002b:00007ffc83042ab8 EFLAGS: 00000246 ORIG_RAX: 0000000000000000 [ 44.432054] RAX: ffffffffffffffda RBX: 00000000ffffffff RCX: 0000000000441239 [ 44.439332] RDX: 0000000000001000 RSI: 0000000020000100 RDI: 0000000000000003 [ 44.446610] RBP: 6f72746e6f632f2e R08: 00007ffc83042b30 R09: 00007ffc83042b30 [ 44.453883] R10: 00007ffc83042b30 R11: 0000000000000246 R12: 6d74702f7665642f [ 44.461154] R13: 0030656c69662f2e R14: 0000000000000000 R15: 0000000000000000 [ 44.468432] [ 44.470053] Uninit was created at: [ 44.473607] kmsan_internal_alloc_meta_for_pages+0x157/0x730 [ 44.479413] kmsan_alloc_page+0x80/0xe0 [ 44.483592] __alloc_pages_nodemask+0x105b/0x6320 [ 44.488442] alloc_pages_current+0x6b1/0x970 [ 44.492864] __vmalloc_node_range+0x8bf/0x1170 [ 44.497448] vmalloc+0xd8/0xf0 [ 44.500650] snd_pcm_oss_change_params_locked+0x6597/0x6bf0 [ 44.506369] snd_pcm_oss_read+0x4d0/0x1b80 [ 44.510607] __vfs_read+0x1f0/0xb40 [ 44.514243] vfs_read+0x36c/0x6b0 [ 44.517700] __x64_sys_read+0x1cf/0x400 [ 44.521678] do_syscall_64+0x15b/0x230 [ 44.525572] entry_SYSCALL_64_after_hwframe+0x63/0xe7 [ 44.530751] [ 44.532374] Byte 0 of 1 is uninitialized [ 44.536432] Memory access starts at ffffc9000189f000 [ 44.541530] ================================================================== [ 44.548881] Disabling lock debugging due to kernel taint [ 44.554332] Kernel panic - not syncing: panic_on_warn set ... [ 44.554332] [ 44.561708] CPU: 1 PID: 4583 Comm: syz-executor210 Tainted: G B 4.18.0-rc4+ #25 [ 44.570455] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 44.579806] Call Trace: [ 44.582409] dump_stack+0x185/0x1e0 [ 44.586051] panic+0x3d0/0x9b0 [ 44.589275] kmsan_report+0x2bf/0x2c0 [ 44.593091] kmsan_internal_check_memory+0x18e/0x210 [ 44.598214] kmsan_copy_to_user+0x83/0xe0 [ 44.602375] snd_pcm_oss_read+0x7cf/0x1b80 [ 44.606664] ? snd_pcm_oss_unregister_minor+0x4d0/0x4d0 [ 44.612036] __vfs_read+0x1f0/0xb40 [ 44.615681] ? rw_verify_area+0x35e/0x580 [ 44.619853] vfs_read+0x36c/0x6b0 [ 44.623325] __x64_sys_read+0x1cf/0x400 [ 44.627318] ? ksys_read+0x380/0x380 [ 44.631038] do_syscall_64+0x15b/0x230 [ 44.634940] entry_SYSCALL_64_after_hwframe+0x63/0xe7 [ 44.640304] RIP: 0033:0x441239 [ 44.643486] 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 3b 10 fc ff c3 66 2e 0f 1f 84 00 00 00 00 [ 44.662819] RSP: 002b:00007ffc83042ab8 EFLAGS: 00000246 ORIG_RAX: 0000000000000000 [ 44.670544] RAX: ffffffffffffffda RBX: 00000000ffffffff RCX: 0000000000441239 [ 44.677836] RDX: 0000000000001000 RSI: 0000000020000100 RDI: 0000000000000003 [ 44.685117] RBP: 6f72746e6f632f2e R08: 00007ffc83042b30 R09: 00007ffc83042b30 [ 44.692396] R10: 00007ffc83042b30 R11: 0000000000000246 R12: 6d74702f7665642f [ 44.699672] R13: 0030656c69662f2e R14: 0000000000000000 R15: 0000000000000000 [ 44.707447] Dumping ftrace buffer: [ 44.710969] (ftrace buffer empty) [ 44.714657] Kernel Offset: disabled [ 44.718264] Rebooting in 86400 seconds..