[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 98.911531] audit: type=1800 audit(1548651804.959:25): pid=11001 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 98.930863] audit: type=1800 audit(1548651804.979:26): pid=11001 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 98.950375] audit: type=1800 audit(1548651804.989:27): pid=11001 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 syzkaller login: [ 105.870584] sshd (11138) used greatest stack depth: 53632 bytes left Warning: Permanently added '10.128.0.190' (ECDSA) to the list of known hosts. executing program executing program executing program executing program executing program executing program executing program [ 116.245880] ================================================================== [ 116.253268] BUG: KMSAN: kernel-infoleak in _copy_to_user+0x16b/0x1f0 [ 116.259746] CPU: 0 PID: 11180 Comm: syz-executor070 Not tainted 5.0.0-rc1+ #7 [ 116.266997] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 116.276344] Call Trace: [ 116.278929] dump_stack+0x173/0x1d0 [ 116.282565] kmsan_report+0x12e/0x2a0 [ 116.286391] kmsan_internal_check_memory+0x465/0xb10 [ 116.291504] kmsan_copy_to_user+0xab/0xc0 [ 116.295642] _copy_to_user+0x16b/0x1f0 [ 116.299542] snd_pcm_oss_read+0xd4a/0x1960 [ 116.303817] ? snd_pcm_oss_unregister_minor+0x4b0/0x4b0 [ 116.309198] __vfs_read+0x1e5/0xbf0 [ 116.312815] ? security_file_permission+0x521/0x660 [ 116.317844] ? rw_verify_area+0x35e/0x580 [ 116.322019] vfs_read+0x359/0x6f0 [ 116.325489] __se_sys_read+0x17a/0x370 [ 116.329382] __x64_sys_read+0x4a/0x70 [ 116.333174] do_syscall_64+0xbc/0xf0 [ 116.336888] entry_SYSCALL_64_after_hwframe+0x63/0xe7 [ 116.342076] RIP: 0033:0x449ec9 [ 116.345268] Code: e8 2c b3 02 00 48 83 c4 18 c3 0f 1f 80 00 00 00 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 4b cd fb ff c3 66 2e 0f 1f 84 00 00 00 00 [ 116.364177] RSP: 002b:00007fbb4447edb8 EFLAGS: 00000246 ORIG_RAX: 0000000000000000 [ 116.371891] RAX: ffffffffffffffda RBX: 00000000006dac48 RCX: 0000000000449ec9 [ 116.379165] RDX: 0000000000001000 RSI: 0000000020000080 RDI: 0000000000000003 [ 116.386435] RBP: 00000000006dac40 R08: 00007fbb4447f700 R09: 0000000000000000 [ 116.393687] R10: 00007fbb4447f700 R11: 0000000000000246 R12: 00000000006dac4c [ 116.400974] R13: 00007ffc0a1f617f R14: 00007fbb4447f9c0 R15: 0000000000000001 [ 116.408264] [ 116.409879] Uninit was created at: [ 116.413412] No stack [ 116.415716] [ 116.417333] Byte 2052 of 2640 is uninitialized [ 116.421921] Memory access of size 2640 starts at ffff8880ba529000 [ 116.428143] Data copied to user address 0000000020000080 [ 116.433621] ================================================================== [ 116.440978] Disabling lock debugging due to kernel taint [ 116.446408] Kernel panic - not syncing: panic_on_warn set ... [ 116.452283] CPU: 0 PID: 11180 Comm: syz-executor070 Tainted: G B 5.0.0-rc1+ #7 [ 116.460944] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 116.470282] Call Trace: [ 116.472864] dump_stack+0x173/0x1d0 [ 116.476498] panic+0x3d1/0xb01 [ 116.479712] kmsan_report+0x293/0x2a0 [ 116.483512] kmsan_internal_check_memory+0x465/0xb10 [ 116.488630] kmsan_copy_to_user+0xab/0xc0 [ 116.492769] _copy_to_user+0x16b/0x1f0 [ 116.496661] snd_pcm_oss_read+0xd4a/0x1960 [ 116.500923] ? snd_pcm_oss_unregister_minor+0x4b0/0x4b0 [ 116.506292] __vfs_read+0x1e5/0xbf0 [ 116.509910] ? security_file_permission+0x521/0x660 [ 116.514941] ? rw_verify_area+0x35e/0x580 [ 116.519105] vfs_read+0x359/0x6f0 [ 116.522583] __se_sys_read+0x17a/0x370 [ 116.526499] __x64_sys_read+0x4a/0x70 [ 116.530290] do_syscall_64+0xbc/0xf0 [ 116.534000] entry_SYSCALL_64_after_hwframe+0x63/0xe7 [ 116.539175] RIP: 0033:0x449ec9 [ 116.542356] Code: e8 2c b3 02 00 48 83 c4 18 c3 0f 1f 80 00 00 00 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 4b cd fb ff c3 66 2e 0f 1f 84 00 00 00 00 [ 116.561246] RSP: 002b:00007fbb4447edb8 EFLAGS: 00000246 ORIG_RAX: 0000000000000000 [ 116.568941] RAX: ffffffffffffffda RBX: 00000000006dac48 RCX: 0000000000449ec9 [ 116.576195] RDX: 0000000000001000 RSI: 0000000020000080 RDI: 0000000000000003 [ 116.583456] RBP: 00000000006dac40 R08: 00007fbb4447f700 R09: 0000000000000000 [ 116.590727] R10: 00007fbb4447f700 R11: 0000000000000246 R12: 00000000006dac4c [ 116.597984] R13: 00007ffc0a1f617f R14: 00007fbb4447f9c0 R15: 0000000000000001 [ 116.606242] Kernel Offset: disabled [ 116.609868] Rebooting in 86400 seconds..