[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 69.206663][ T31] audit: type=1800 audit(1560885415.258:25): pid=10915 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 69.230062][ T31] audit: type=1800 audit(1560885415.278:26): pid=10915 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 69.264245][ T31] audit: type=1800 audit(1560885415.308:27): pid=10915 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: [ 76.931677][T11055] sshd (11055) used greatest stack depth: 53608 bytes left Warning: Permanently added '10.128.1.30' (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 [ 84.241772][T11115] ================================================================== [ 84.249903][T11115] BUG: KMSAN: kernel-infoleak in copyout+0x16b/0x1f0 [ 84.256595][T11115] CPU: 1 PID: 11115 Comm: blkid Not tainted 5.2.0-rc4+ #4 [ 84.263711][T11115] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 84.273779][T11115] Call Trace: [ 84.277091][T11115] dump_stack+0x191/0x1f0 [ 84.281465][T11115] kmsan_report+0x162/0x2d0 [ 84.285996][T11115] kmsan_internal_check_memory+0x974/0xa80 executing program executing program executing program executing program executing program [ 84.291839][T11115] kmsan_copy_to_user+0xa9/0xb0 [ 84.296705][T11115] copyout+0x16b/0x1f0 [ 84.300804][T11115] copy_page_to_iter+0x6dc/0x1910 [ 84.305868][T11115] generic_file_read_iter+0x2979/0x3e70 [ 84.311732][T11115] ? kmsan_get_shadow_origin_ptr+0x71/0x470 [ 84.317650][T11115] blkdev_read_iter+0x20d/0x270 [ 84.322534][T11115] ? blkdev_write_iter+0x650/0x650 [ 84.327668][T11115] __vfs_read+0xa67/0xc90 [ 84.332154][T11115] vfs_read+0x359/0x6f0 [ 84.336336][T11115] ? kmsan_get_shadow_origin_ptr+0x71/0x470 executing program executing program executing program executing program [ 84.342298][T11115] ksys_read+0x265/0x430 [ 84.346574][T11115] __se_sys_read+0x92/0xb0 [ 84.353453][T11115] __x64_sys_read+0x4a/0x70 [ 84.357970][T11115] do_syscall_64+0xbc/0xf0 [ 84.362594][T11115] entry_SYSCALL_64_after_hwframe+0x63/0xe7 [ 84.368509][T11115] RIP: 0033:0x7f0f3ab59310 [ 84.372954][T11115] 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 executing program executing program executing program executing program executing program [ 84.392746][T11115] RSP: 002b:00007ffeadf0a5e8 EFLAGS: 00000246 ORIG_RAX: 0000000000000000 [ 84.414464][T11115] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f0f3ab59310 [ 84.422459][T11115] RDX: 0000000000000561 RSI: 0000000000bfd128 RDI: 0000000000000003 [ 84.430963][T11115] RBP: 0000000000bfd100 R08: 0000000000000018 R09: 0000000001680000 executing program executing program executing program executing program executing program [ 84.439032][T11115] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000bf6030 [ 84.447015][T11115] R13: 0000000000000561 R14: 0000000000bf6080 R15: 0000000000bfd118 [ 84.455009][T11115] [ 84.457340][T11115] Uninit was created at: [ 84.461694][T11115] kmsan_save_stack_with_flags+0x37/0x70 [ 84.467529][T11115] kmsan_internal_alloc_meta_for_pages+0x123/0x510 [ 84.474058][T11115] kmsan_alloc_page+0x7a/0xf0 [ 84.478758][T11115] __alloc_pages_nodemask+0x144d/0x6020 [ 84.484326][T11115] alloc_pages_current+0x6a0/0x9b0 executing program executing program executing program executing program executing program [ 84.489453][T11115] __page_cache_alloc+0x95/0x320 [ 84.494404][T11115] pagecache_get_page+0x443/0x11f0 [ 84.499528][T11115] filemap_fault+0x25b2/0x2af0 [ 84.504307][T11115] handle_mm_fault+0x4892/0x9ea0 [ 84.509309][T11115] do_user_addr_fault+0x8d4/0x14c0 [ 84.514440][T11115] __do_page_fault+0x1a2/0x410 [ 84.521743][T11115] do_page_fault+0xb1/0x4d0 [ 84.526253][T11115] page_fault+0x3d/0x50 [ 84.530428][T11115] [ 84.532848][T11115] Bytes 0-1376 of 1377 are uninitialized executing program executing program executing program executing program executing program [ 84.538484][T11115] Memory access of size 1377 starts at ffff8880b7034000 [ 84.545419][T11115] Data copied to user address 0000000000bfd128 [ 84.551573][T11115] ================================================================== [ 84.559634][T11115] Disabling lock debugging due to kernel taint [ 84.565880][T11115] Kernel panic - not syncing: panic_on_warn set ... [ 84.572488][T11115] CPU: 1 PID: 11115 Comm: blkid Tainted: G B 5.2.0-rc4+ #4 [ 84.580986][T11115] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 executing program executing program executing program executing program executing program [ 84.591583][T11115] Call Trace: [ 84.594981][T11115] dump_stack+0x191/0x1f0 [ 84.599341][T11115] panic+0x3c9/0xc1e [ 84.603292][T11115] kmsan_report+0x2ca/0x2d0 [ 84.607824][T11115] kmsan_internal_check_memory+0x974/0xa80 [ 84.613668][T11115] kmsan_copy_to_user+0xa9/0xb0 [ 84.618533][T11115] copyout+0x16b/0x1f0 [ 84.622628][T11115] copy_page_to_iter+0x6dc/0x1910 [ 84.627687][T11115] generic_file_read_iter+0x2979/0x3e70 [ 84.633301][T11115] ? kmsan_get_shadow_origin_ptr+0x71/0x470 [ 84.639228][T11115] blkdev_read_iter+0x20d/0x270 executing program executing program executing program executing program executing program [ 84.644107][T11115] ? blkdev_write_iter+0x650/0x650 [ 84.649320][T11115] __vfs_read+0xa67/0xc90 [ 84.653689][T11115] vfs_read+0x359/0x6f0 [ 84.657864][T11115] ? kmsan_get_shadow_origin_ptr+0x71/0x470 [ 84.663796][T11115] ksys_read+0x265/0x430 [ 84.668085][T11115] __se_sys_read+0x92/0xb0 [ 84.672532][T11115] __x64_sys_read+0x4a/0x70 [ 84.677456][T11115] do_syscall_64+0xbc/0xf0 [ 84.681884][T11115] entry_SYSCALL_64_after_hwframe+0x63/0xe7 [ 84.687784][T11115] RIP: 0033:0x7f0f3ab59310 executing program executing program executing program executing program executing program [ 84.692214][T11115] 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 [ 84.711839][T11115] RSP: 002b:00007ffeadf0a5e8 EFLAGS: 00000246 ORIG_RAX: 0000000000000000 [ 84.720273][T11115] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f0f3ab59310 [ 84.728262][T11115] RDX: 0000000000000561 RSI: 0000000000bfd128 RDI: 0000000000000003 [ 84.736334][T11115] RBP: 0000000000bfd100 R08: 0000000000000018 R09: 0000000001680000 executing program [ 84.744327][T11115] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000bf6030 [ 84.752312][T11115] R13: 0000000000000561 R14: 0000000000bf6080 R15: 0000000000bfd118 [ 84.761745][T11115] Kernel Offset: disabled [ 84.766087][T11115] Rebooting in 86400 seconds..