[ 62.867469] audit: type=1800 audit(1542296772.913:25): pid=6528 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 62.886611] audit: type=1800 audit(1542296772.933:26): pid=6528 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 62.906079] audit: type=1800 audit(1542296772.943:27): pid=6528 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="restorecond" dev="sda1" ino=2436 res=0 [ 62.925683] audit: type=1800 audit(1542296772.963:28): pid=6528 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="ssh" dev="sda1" ino=2417 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 '10.128.0.85' (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 syzkaller login: [ 74.262701] ================================================================== [ 74.270138] BUG: KMSAN: uninit-value in _copy_to_user+0x214/0x230 [ 74.276403] CPU: 1 PID: 6709 Comm: syz-executor063 Not tainted 4.20.0-rc2+ #87 [ 74.283770] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 74.293117] Call Trace: [ 74.295701] dump_stack+0x32d/0x480 [ 74.299364] ? _copy_to_user+0x214/0x230 [ 74.303435] kmsan_report+0x19f/0x300 [ 74.307242] __msan_warning+0x76/0xc0 [ 74.311103] _copy_to_user+0x214/0x230 [ 74.315010] __vb2_perform_fileio+0x5d8/0x23d0 [ 74.319646] vb2_read+0xf7/0x110 [ 74.323044] vb2_fop_read+0x475/0x640 [ 74.326861] ? vb2_fop_write+0x640/0x640 [ 74.330918] v4l2_read+0x274/0x4a0 [ 74.334462] ? INIT_INT+0x40/0x40 [ 74.337913] __vfs_read+0x1e2/0xb00 [ 74.341567] ? rw_verify_area+0x35e/0x580 [ 74.345727] vfs_read+0x380/0x6b0 [ 74.349193] __se_sys_read+0x17a/0x370 [ 74.353089] __x64_sys_read+0x4a/0x70 [ 74.356908] do_syscall_64+0xcf/0x110 [ 74.360708] entry_SYSCALL_64_after_hwframe+0x63/0xe7 [ 74.365890] RIP: 0033:0x444b49 [ 74.369090] Code: e8 ac e8 ff ff 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 2b ce fb ff c3 66 2e 0f 1f 84 00 00 00 00 [ 74.387987] RSP: 002b:00007ffe30bbc858 EFLAGS: 00000213 ORIG_RAX: 0000000000000000 [ 74.395691] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000444b49 [ 74.402952] RDX: 0000000000000249 RSI: 0000000020000100 RDI: 0000000000000003 [ 74.410213] RBP: 0000000000000000 R08: 000000000238f880 R09: 00000000004002e0 [ 74.417488] R10: 000000000000000f R11: 0000000000000213 R12: 00000000000120bf [ 74.424793] R13: 0000000000401e90 R14: 0000000000000000 R15: 0000000000000000 [ 74.432132] [ 74.433786] Uninit was created at: [ 74.437360] kmsan_internal_poison_shadow+0xc8/0x1c0 [ 74.442484] kmsan_kmalloc+0x98/0xf0 [ 74.446242] kmsan_slab_alloc+0xe/0x10 [ 74.450138] __kmalloc_node_track_caller+0xf62/0x14e0 [ 74.455355] __alloc_skb+0x42b/0xeb0 [ 74.459110] sk_stream_alloc_skb+0x236/0xe60 [ 74.463556] tcp_sendmsg_locked+0x2638/0x6c30 [ 74.468075] tcp_sendmsg+0xb2/0x100 [ 74.471694] inet_sendmsg+0x4e9/0x800 [ 74.475487] sock_write_iter+0x3f4/0x4f0 [ 74.479557] __vfs_write+0x888/0xb80 [ 74.483263] vfs_write+0x4a3/0x8f0 [ 74.486825] __se_sys_write+0x17a/0x370 [ 74.490792] __x64_sys_write+0x4a/0x70 [ 74.494679] do_syscall_64+0xcf/0x110 [ 74.498491] entry_SYSCALL_64_after_hwframe+0x63/0xe7 [ 74.503688] ================================================================== [ 74.511059] Disabling lock debugging due to kernel taint [ 74.516504] Kernel panic - not syncing: panic_on_warn set ... [ 74.522437] CPU: 1 PID: 6709 Comm: syz-executor063 Tainted: G B 4.20.0-rc2+ #87 [ 74.531200] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 74.540560] Call Trace: [ 74.543172] dump_stack+0x32d/0x480 [ 74.546824] panic+0x624/0xc08 [ 74.550102] kmsan_report+0x300/0x300 [ 74.553945] __msan_warning+0x76/0xc0 [ 74.557808] _copy_to_user+0x214/0x230 [ 74.561724] __vb2_perform_fileio+0x5d8/0x23d0 [ 74.566344] vb2_read+0xf7/0x110 [ 74.569720] vb2_fop_read+0x475/0x640 [ 74.573534] ? vb2_fop_write+0x640/0x640 [ 74.577594] v4l2_read+0x274/0x4a0 [ 74.581152] ? INIT_INT+0x40/0x40 [ 74.584631] __vfs_read+0x1e2/0xb00 [ 74.588263] ? rw_verify_area+0x35e/0x580 [ 74.592414] vfs_read+0x380/0x6b0 [ 74.595877] __se_sys_read+0x17a/0x370 [ 74.599770] __x64_sys_read+0x4a/0x70 [ 74.603571] do_syscall_64+0xcf/0x110 [ 74.607369] entry_SYSCALL_64_after_hwframe+0x63/0xe7 [ 74.612550] RIP: 0033:0x444b49 [ 74.615739] Code: e8 ac e8 ff ff 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 2b ce fb ff c3 66 2e 0f 1f 84 00 00 00 00 [ 74.634631] RSP: 002b:00007ffe30bbc858 EFLAGS: 00000213 ORIG_RAX: 0000000000000000 [ 74.642353] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000444b49 [ 74.649634] RDX: 0000000000000249 RSI: 0000000020000100 RDI: 0000000000000003 [ 74.656895] RBP: 0000000000000000 R08: 000000000238f880 R09: 00000000004002e0 [ 74.664175] R10: 000000000000000f R11: 0000000000000213 R12: 00000000000120bf [ 74.671439] R13: 0000000000401e90 R14: 0000000000000000 R15: 0000000000000000 [ 74.679603] Kernel Offset: disabled [ 74.683243] Rebooting in 86400 seconds..