[ 107.100894] audit: type=1800 audit(1555290449.165:25): pid=11360 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 107.132833] audit: type=1800 audit(1555290449.195:26): pid=11360 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 107.152387] audit: type=1800 audit(1555290449.205:27): pid=11360 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. [ 109.715660] sshd (11488) used greatest stack depth: 53616 bytes left Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.1.31' (ECDSA) to the list of known hosts. executing program executing program syzkaller login: [ 117.565781] ================================================================== [ 117.573190] BUG: KMSAN: uninit-value in memcmp+0x117/0x180 [ 117.578816] CPU: 0 PID: 1136 Comm: kworker/u5:0 Not tainted 5.1.0-rc4+ #1 [ 117.585734] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 117.595082] Workqueue: hci0 hci_rx_work [ 117.599173] Call Trace: [ 117.601765] dump_stack+0x173/0x1d0 [ 117.605397] kmsan_report+0x131/0x2a0 [ 117.609220] __msan_warning+0x7a/0xf0 [ 117.613026] memcmp+0x117/0x180 [ 117.616314] hci_inquiry_cache_update+0x430/0x19c0 [ 117.621246] ? kmsan_internal_memset_shadow+0x104/0x3a0 [ 117.626624] ? kmsan_memcpy_memmove_metadata+0x989/0xd60 [ 117.632083] hci_event_packet+0x924e/0x35950 [ 117.636485] ? kmsan_get_shadow_origin_ptr+0x73/0x480 [ 117.641710] ? kmsan_get_shadow_origin_ptr+0x73/0x480 [ 117.646930] ? kmsan_get_shadow_origin_ptr+0x73/0x480 [ 117.652136] hci_rx_work+0x478/0xcc0 [ 117.655859] ? kmsan_get_shadow_origin_ptr+0x73/0x480 [ 117.661046] ? hci_alloc_dev+0x2320/0x2320 [ 117.665276] process_one_work+0x1607/0x2010 [ 117.669653] worker_thread+0x111c/0x2460 [ 117.673778] kthread+0x4a1/0x4e0 [ 117.677140] ? process_one_work+0x2010/0x2010 [ 117.681627] ? schedule_tail+0x1b2/0x410 [ 117.685966] ? kthread_blkcg+0xf0/0xf0 [ 117.689851] ret_from_fork+0x35/0x40 [ 117.693598] [ 117.695226] Uninit was stored to memory at: [ 117.699553] kmsan_internal_chain_origin+0x134/0x230 [ 117.704678] kmsan_memcpy_memmove_metadata+0x989/0xd60 [ 117.709945] kmsan_memcpy_metadata+0xb/0x10 [ 117.714258] __msan_memcpy+0x58/0x70 [ 117.717973] hci_event_packet+0x9081/0x35950 [ 117.722394] hci_rx_work+0x478/0xcc0 [ 117.726108] process_one_work+0x1607/0x2010 [ 117.730424] worker_thread+0x111c/0x2460 [ 117.734473] kthread+0x4a1/0x4e0 [ 117.737838] ret_from_fork+0x35/0x40 [ 117.741535] [ 117.743147] Uninit was created at: [ 117.746720] kmsan_internal_poison_shadow+0x92/0x150 [ 117.751836] kmsan_kmalloc+0xa9/0x130 [ 117.755631] kmsan_slab_alloc+0xe/0x10 [ 117.759511] __kmalloc_node_track_caller+0xead/0x1000 [ 117.764688] __alloc_skb+0x309/0xa20 [ 117.768392] vhci_write+0x15b/0x7e0 [ 117.772029] __vfs_write+0x99f/0xc30 [ 117.775758] vfs_write+0x481/0x920 [ 117.779285] ksys_write+0x20c/0x440 [ 117.782986] __se_sys_write+0x92/0xb0 [ 117.786769] __x64_sys_write+0x4a/0x70 [ 117.790646] do_syscall_64+0xbc/0xf0 [ 117.794380] entry_SYSCALL_64_after_hwframe+0x63/0xe7 [ 117.799548] ================================================================== [ 117.806890] Disabling lock debugging due to kernel taint [ 117.812344] Kernel panic - not syncing: panic_on_warn set ... [ 117.818235] CPU: 0 PID: 1136 Comm: kworker/u5:0 Tainted: G B 5.1.0-rc4+ #1 [ 117.826560] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 117.836058] Workqueue: hci0 hci_rx_work [ 117.840035] Call Trace: [ 117.842638] dump_stack+0x173/0x1d0 [ 117.846289] panic+0x3d1/0xb01 [ 117.849535] kmsan_report+0x29a/0x2a0 [ 117.853354] __msan_warning+0x7a/0xf0 [ 117.857163] memcmp+0x117/0x180 [ 117.860448] hci_inquiry_cache_update+0x430/0x19c0 [ 117.865372] ? kmsan_internal_memset_shadow+0x104/0x3a0 [ 117.870738] ? kmsan_memcpy_memmove_metadata+0x989/0xd60 [ 117.876207] hci_event_packet+0x924e/0x35950 [ 117.880607] ? kmsan_get_shadow_origin_ptr+0x73/0x480 [ 117.885880] ? kmsan_get_shadow_origin_ptr+0x73/0x480 [ 117.891082] ? kmsan_get_shadow_origin_ptr+0x73/0x480 [ 117.896271] hci_rx_work+0x478/0xcc0 [ 117.899992] ? kmsan_get_shadow_origin_ptr+0x73/0x480 [ 117.905176] ? hci_alloc_dev+0x2320/0x2320 [ 117.909422] process_one_work+0x1607/0x2010 [ 117.913796] worker_thread+0x111c/0x2460 [ 117.917913] kthread+0x4a1/0x4e0 [ 117.921293] ? process_one_work+0x2010/0x2010 [ 117.925779] ? schedule_tail+0x1b2/0x410 [ 117.929835] ? kthread_blkcg+0xf0/0xf0 [ 117.933747] ret_from_fork+0x35/0x40 [ 117.938243] Kernel Offset: disabled [ 117.941879] Rebooting in 86400 seconds..