[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 40.189683] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. [ 40.676741] random: sshd: uninitialized urandom read (32 bytes read) [ 41.003209] random: sshd: uninitialized urandom read (32 bytes read) Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 41.873326] random: sshd: uninitialized urandom read (32 bytes read) [ 138.361201] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.21' (ECDSA) to the list of known hosts. [ 144.150890] random: sshd: uninitialized urandom read (32 bytes read) [ 144.299828] IPVS: ftp: loaded support on port[0] = 21 [ 144.349865] ip (4760) used greatest stack depth: 53864 bytes left [ 144.521107] bridge0: port 1(bridge_slave_0) entered blocking state [ 144.527570] bridge0: port 1(bridge_slave_0) entered disabled state [ 144.535338] device bridge_slave_0 entered promiscuous mode [ 144.560738] bridge0: port 2(bridge_slave_1) entered blocking state [ 144.567129] bridge0: port 2(bridge_slave_1) entered disabled state [ 144.574432] device bridge_slave_1 entered promiscuous mode [ 144.599203] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bridge: link is not ready [ 144.625002] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bridge: link is not ready [ 144.697115] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 144.725066] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 144.796616] ip (4798) used greatest stack depth: 53480 bytes left [ 144.839152] IPv6: ADDRCONF(NETDEV_UP): team_slave_0: link is not ready [ 144.846572] team0: Port device team_slave_0 added [ 144.870326] IPv6: ADDRCONF(NETDEV_UP): team_slave_1: link is not ready [ 144.877780] team0: Port device team_slave_1 added [ 144.902855] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_0: link becomes ready [ 144.930722] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_1: link becomes ready [ 144.958452] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_bridge: link becomes ready [ 144.986968] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_bridge: link becomes ready RTNETLINK answers: Operation not supported RTNETLINK answers: No buffer space available [ 145.229547] bridge0: port 2(bridge_slave_1) entered blocking state [ 145.236159] bridge0: port 2(bridge_slave_1) entered forwarding state [ 145.243112] bridge0: port 1(bridge_slave_0) entered blocking state [ 145.249602] bridge0: port 1(bridge_slave_0) entered forwarding state RTNETLINK answers: Operation not supported RTNETLINK answers: Operation not supported RTNETLINK answers: Operation not supported RTNETLINK answers: Operation not supported RTNETLINK answers: Invalid argument RTNETLINK answers: Invalid argument RTNETLINK answers: Invalid argument [ 145.811867] ip (4892) used greatest stack depth: 53448 bytes left [ 146.124464] 8021q: adding VLAN 0 to HW filter on device bond0 [ 146.212210] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready [ 146.298435] IPv6: ADDRCONF(NETDEV_UP): veth1: link is not ready [ 146.304637] IPv6: ADDRCONF(NETDEV_CHANGE): veth1: link becomes ready [ 146.313235] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 146.394611] 8021q: adding VLAN 0 to HW filter on device team0 executing program executing program [ 147.053989] ================================================================== [ 147.061437] BUG: KMSAN: kernel-infoleak in copy_page_to_iter+0x77a/0x1ac0 [ 147.068860] CPU: 0 PID: 5005 Comm: blkid Not tainted 4.19.0-rc1+ #39 [ 147.075361] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 147.084721] Call Trace: [ 147.087341] dump_stack+0x14b/0x190 [ 147.091009] kmsan_report+0x183/0x2b0 [ 147.094850] kmsan_internal_check_memory+0x17e/0x1f0 [ 147.099997] kmsan_copy_to_user+0x73/0xb0 [ 147.104173] copy_page_to_iter+0x77a/0x1ac0 [ 147.108548] generic_file_read_iter+0x3469/0x4430 [ 147.113475] blkdev_read_iter+0x20d/0x270 [ 147.117650] ? blkdev_write_iter+0x5d0/0x5d0 [ 147.122078] __vfs_read+0x7bb/0x9f0 [ 147.125754] vfs_read+0x36f/0x6a0 [ 147.129318] __x64_sys_read+0x1b7/0x3c0 [ 147.133337] ? ksys_read+0x340/0x340 [ 147.137076] do_syscall_64+0x15b/0x220 [ 147.140997] entry_SYSCALL_64_after_hwframe+0x63/0xe7 [ 147.146201] RIP: 0033:0x7f6bf4959310 [ 147.149936] 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 [ 147.168862] RSP: 002b:00007fff70489898 EFLAGS: 00000246 ORIG_RAX: 0000000000000000 [ 147.176590] RAX: ffffffffffffffda RBX: 0000000000037000 RCX: 00007f6bf4959310 [ 147.183888] RDX: 0000000000000029 RSI: 0000000000ddf1c8 RDI: 0000000000000003 [ 147.191165] RBP: 0000000000ddf1a0 R08: 0000000000000058 R09: 0101010101010101 [ 147.198450] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000dd9030 [ 147.205734] R13: 0000000000000029 R14: 0000000000dd9080 R15: 0000000000ddf1b8 [ 147.213026] [ 147.214660] Uninit was created at: [ 147.218236] kmsan_internal_alloc_meta_for_pages+0x146/0x700 [ 147.224068] kmsan_alloc_page+0x75/0xd0 [ 147.228063] __alloc_pages_nodemask+0xf6b/0x5c80 [ 147.232837] alloc_pages_current+0x6b1/0x970 [ 147.237265] __page_cache_alloc+0x95/0x320 [ 147.241523] generic_file_read_iter+0x27a4/0x4430 [ 147.246383] blkdev_read_iter+0x20d/0x270 [ 147.250552] __vfs_read+0x7bb/0x9f0 executing program [ 147.254195] vfs_read+0x36f/0x6a0 [ 147.257663] __x64_sys_read+0x1b7/0x3c0 [ 147.261655] do_syscall_64+0x15b/0x220 [ 147.265565] entry_SYSCALL_64_after_hwframe+0x63/0xe7 [ 147.270769] [ 147.272409] Bytes 0-40 of 41 are uninitialized [ 147.277002] Memory access starts at ffff8801b1729000 [ 147.282110] ================================================================== [ 147.289479] Disabling lock debugging due to kernel taint [ 147.294937] Kernel panic - not syncing: panic_on_warn set ... [ 147.294937] [ 147.302337] CPU: 0 PID: 5005 Comm: blkid Tainted: G B 4.19.0-rc1+ #39 [ 147.310225] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 147.319634] Call Trace: [ 147.322241] dump_stack+0x14b/0x190 [ 147.325906] panic+0x35d/0x8cb [ 147.329171] kmsan_report+0x2a8/0x2b0 [ 147.333003] kmsan_internal_check_memory+0x17e/0x1f0 [ 147.338179] kmsan_copy_to_user+0x73/0xb0 [ 147.342356] copy_page_to_iter+0x77a/0x1ac0 [ 147.346726] generic_file_read_iter+0x3469/0x4430 [ 147.351656] blkdev_read_iter+0x20d/0x270 [ 147.355836] ? blkdev_write_iter+0x5d0/0x5d0 [ 147.360264] __vfs_read+0x7bb/0x9f0 [ 147.363938] vfs_read+0x36f/0x6a0 [ 147.367430] __x64_sys_read+0x1b7/0x3c0 [ 147.371465] ? ksys_read+0x340/0x340 [ 147.375200] do_syscall_64+0x15b/0x220 [ 147.379144] entry_SYSCALL_64_after_hwframe+0x63/0xe7 [ 147.384349] RIP: 0033:0x7f6bf4959310 [ 147.388091] 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 [ 147.407029] RSP: 002b:00007fff70489898 EFLAGS: 00000246 ORIG_RAX: 0000000000000000 [ 147.414762] RAX: ffffffffffffffda RBX: 0000000000037000 RCX: 00007f6bf4959310 [ 147.422044] RDX: 0000000000000029 RSI: 0000000000ddf1c8 RDI: 0000000000000003 [ 147.429340] RBP: 0000000000ddf1a0 R08: 0000000000000058 R09: 0101010101010101 [ 147.436620] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000dd9030 [ 147.443907] R13: 0000000000000029 R14: 0000000000dd9080 R15: 0000000000ddf1b8 [ 147.451504] Dumping ftrace buffer: [ 147.455058] (ftrace buffer empty) [ 147.458755] Kernel Offset: disabled [ 147.462377] Rebooting in 86400 seconds..