[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 110.700965] audit: type=1800 audit(1554234259.748:25): pid=11234 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 110.722577] audit: type=1800 audit(1554234259.778:26): pid=11234 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 110.742207] audit: type=1800 audit(1554234259.788:27): pid=11234 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 Warning: Permanently added '10.128.0.134' (ECDSA) to the list of known hosts. 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 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 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 syzkaller login: [ 124.405381] ================================================================== [ 124.412929] BUG: KMSAN: kernel-infoleak in copyout+0x16b/0x1f0 [ 124.418955] CPU: 0 PID: 11499 Comm: blkid Not tainted 5.1.0-rc2+ #21 [ 124.425498] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 124.434898] Call Trace: [ 124.437555] dump_stack+0x173/0x1d0 [ 124.441247] kmsan_report+0x131/0x2a0 [ 124.445112] kmsan_internal_check_memory+0xaa1/0xbb0 [ 124.450279] ? kmsan_internal_memset_shadow+0xc6/0x410 executing program executing program executing program executing program [ 124.455616] ? __msan_metadata_ptr_for_load_1+0x10/0x20 [ 124.461094] kmsan_copy_to_user+0xab/0xc0 [ 124.465329] copyout+0x16b/0x1f0 [ 124.468793] copy_page_to_iter+0x654/0x1910 [ 124.473209] generic_file_read_iter+0x2f2c/0x4620 [ 124.478180] ? kmsan_get_shadow_origin_ptr+0x73/0x490 [ 124.483454] blkdev_read_iter+0x20d/0x270 [ 124.487668] ? blkdev_write_iter+0x650/0x650 [ 124.492138] __vfs_read+0x964/0xc00 [ 124.495863] vfs_read+0x359/0x6f0 [ 124.499402] ? kmsan_get_shadow_origin_ptr+0x73/0x490 executing program executing program executing program executing program [ 124.504657] __se_sys_read+0x17a/0x370 [ 124.508609] __x64_sys_read+0x4a/0x70 [ 124.512464] do_syscall_64+0xbc/0xf0 [ 124.516244] entry_SYSCALL_64_after_hwframe+0x63/0xe7 [ 124.521509] RIP: 0033:0x7f03f78c3310 [ 124.525264] Code: 73 01 c3 48 8b 0d 28 4b 2b 00 31 d2 48 29 c2 64 89 11 48 83 c8 ff eb ea 90 90 83 3d e5 a2 2b 00 00 75 10 b8 00 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 31 c3 48 83 ec 08 e8 6e 8a 01 00 48 89 04 24 [ 124.544222] RSP: 002b:00007ffd44dd6b98 EFLAGS: 00000246 ORIG_RAX: 0000000000000000 executing program executing program executing program [ 124.551988] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f03f78c3310 [ 124.559303] RDX: 0000000000000400 RSI: 0000000001adfb18 RDI: 0000000000000003 [ 124.566621] RBP: 0000000001adfaf0 R08: 0000000000000028 R09: 0000000001680000 [ 124.573929] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000001add030 [ 124.581243] R13: 0000000000000400 R14: 0000000001add080 R15: 0000000001adfb08 [ 124.588584] [ 124.590237] Uninit was created at: [ 124.593814] kmsan_save_stack_with_flags+0x7a/0x130 [ 124.598894] kmsan_internal_alloc_meta_for_pages+0x112/0x500 executing program executing program executing program executing program [ 124.604749] kmsan_alloc_page+0x7e/0x100 [ 124.608866] __alloc_pages_nodemask+0x12fb/0x5e90 [ 124.613780] alloc_pages_current+0x6a4/0x9c0 [ 124.618260] __page_cache_alloc+0x95/0x320 [ 124.622548] pagecache_get_page+0x4e5/0x14e0 [ 124.627018] filemap_fault+0x28dc/0x2f20 [ 124.631135] handle_mm_fault+0x4e6c/0xa4d0 [ 124.635429] __do_page_fault+0xdfd/0x1800 [ 124.639634] do_page_fault+0xe9/0x5c0 [ 124.645044] page_fault+0x3d/0x50 [ 124.648527] [ 124.650185] Bytes 0-1023 of 1024 are uninitialized executing program executing program executing program [ 124.655144] Memory access of size 1024 starts at ffff8880a3597000 [ 124.661757] Data copied to user address 0000000001adfb18 [ 124.667235] ================================================================== [ 124.674622] Disabling lock debugging due to kernel taint [ 124.680112] Kernel panic - not syncing: panic_on_warn set ... [ 124.686059] CPU: 0 PID: 11499 Comm: blkid Tainted: G B 5.1.0-rc2+ #21 [ 124.693973] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 124.703377] Call Trace: executing program executing program executing program executing program [ 124.706019] dump_stack+0x173/0x1d0 [ 124.709711] panic+0x3d1/0xb01 [ 124.713018] kmsan_report+0x29a/0x2a0 [ 124.716895] kmsan_internal_check_memory+0xaa1/0xbb0 [ 124.722070] ? kmsan_internal_memset_shadow+0xc6/0x410 [ 124.727443] ? __msan_metadata_ptr_for_load_1+0x10/0x20 [ 124.732888] kmsan_copy_to_user+0xab/0xc0 [ 124.737101] copyout+0x16b/0x1f0 [ 124.740563] copy_page_to_iter+0x654/0x1910 [ 124.744986] generic_file_read_iter+0x2f2c/0x4620 [ 124.749956] ? kmsan_get_shadow_origin_ptr+0x73/0x490 executing program executing program executing program executing program [ 124.755221] blkdev_read_iter+0x20d/0x270 [ 124.759451] ? blkdev_write_iter+0x650/0x650 [ 124.763906] __vfs_read+0x964/0xc00 [ 124.767646] vfs_read+0x359/0x6f0 [ 124.771176] ? kmsan_get_shadow_origin_ptr+0x73/0x490 [ 124.776446] __se_sys_read+0x17a/0x370 [ 124.780427] __x64_sys_read+0x4a/0x70 [ 124.784291] do_syscall_64+0xbc/0xf0 [ 124.788697] entry_SYSCALL_64_after_hwframe+0x63/0xe7 [ 124.793946] RIP: 0033:0x7f03f78c3310 executing program executing program executing program [ 124.797711] Code: 73 01 c3 48 8b 0d 28 4b 2b 00 31 d2 48 29 c2 64 89 11 48 83 c8 ff eb ea 90 90 83 3d e5 a2 2b 00 00 75 10 b8 00 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 31 c3 48 83 ec 08 e8 6e 8a 01 00 48 89 04 24 [ 124.816662] RSP: 002b:00007ffd44dd6b98 EFLAGS: 00000246 ORIG_RAX: 0000000000000000 [ 124.824434] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f03f78c3310 [ 124.831745] RDX: 0000000000000400 RSI: 0000000001adfb18 RDI: 0000000000000003 [ 124.839056] RBP: 0000000001adfaf0 R08: 0000000000000028 R09: 0000000001680000 [ 124.846379] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000001add030 executing program [ 124.853690] R13: 0000000000000400 R14: 0000000001add080 R15: 0000000001adfb08 [ 124.861808] Kernel Offset: disabled [ 124.865463] Rebooting in 86400 seconds..