[....] Starting periodic command scheduler: cron[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 34.862470] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [ 35.508124] random: sshd: uninitialized urandom read (32 bytes read) [ 35.812538] random: sshd: uninitialized urandom read (32 bytes read) Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 37.228658] random: sshd: uninitialized urandom read (32 bytes read) [ 523.941440] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.58' (ECDSA) to the list of known hosts. [ 529.436596] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 717.791305] INFO: task syz-executor010:4602 blocked for more than 140 seconds. [ 717.798826] Not tainted 4.18.0-rc5+ #29 [ 717.803395] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 717.811438] syz-executor010 D57104 4602 4598 0x00000004 [ 717.817993] Call Trace: [ 717.820718] __schedule+0x652/0x780 [ 717.824439] schedule+0x1cc/0x300 [ 717.827981] __fuse_request_send+0x105a/0x1a90 [ 717.832655] ? init_wait_entry+0x1a0/0x1a0 [ 717.837087] fuse_simple_request+0x9cc/0xc10 [ 717.841827] fuse_lookup_name+0x472/0xc80 [ 717.846247] ? rcu_all_qs+0x3f/0x210 [ 717.850213] fuse_lookup+0x193/0x810 [ 717.854454] ? kmsan_set_origin_inline+0x6b/0x120 [ 717.859507] fuse_atomic_open+0x2b7/0x1f00 [ 717.863822] ? fuse_dentry_revalidate+0x13d0/0x13d0 [ 717.868968] ? __list_add_valid+0xb8/0x450 [ 717.873302] ? d_alloc_parallel+0x2172/0x2470 [ 717.877932] ? rcu_all_qs+0x3f/0x210 [ 717.881730] ? fuse_rename2+0x4e0/0x4e0 [ 717.885770] path_openat+0x1fa2/0x69c0 [ 717.889844] ? do_filp_open+0x88/0x740 [ 717.893805] do_filp_open+0x2c1/0x740 [ 717.897863] do_open_execat+0x1d1/0x720 [ 717.902643] __do_execve_file+0xb6f/0x3020 [ 717.907078] ? strncpy_from_user+0x3bc/0x4b0 [ 717.911563] ? __msan_metadata_ptr_for_load_8+0x10/0x20 [ 717.917031] __x64_sys_execve+0x131/0x180 [ 717.921354] ? set_binfmt+0x1b0/0x1b0 [ 717.925323] do_syscall_64+0x15b/0x230 [ 717.929288] entry_SYSCALL_64_after_hwframe+0x63/0xe7 [ 717.935339] RIP: 0033:0x445869 [ 717.938580] Code: Bad RIP value. [ 717.942060] RSP: 002b:00007f26c22beda8 EFLAGS: 00000246 ORIG_RAX: 000000000000003b [ 717.949848] RAX: ffffffffffffffda RBX: 00000000006dac3c RCX: 0000000000445869 [ 717.957496] RDX: 00000000200003c0 RSI: 0000000020000340 RDI: 0000000020000000 [ 717.965176] RBP: 00000000006dac38 R08: 0000000000000000 R09: 0000000000000000 [ 717.972640] R10: 0000000000000000 R11: 0000000000000246 R12: 64695f70756f7267 [ 717.980077] R13: 7375662f7665642f R14: 2f30656c69662f2e R15: 0000000000000001 [ 717.987442] NMI backtrace for cpu 0 [ 717.991139] CPU: 0 PID: 800 Comm: khungtaskd Not tainted 4.18.0-rc5+ #29 [ 717.998006] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 718.007393] Call Trace: [ 718.010012] dump_stack+0x185/0x1e0 [ 718.013642] nmi_trigger_cpumask_backtrace+0x26f/0x4e0 [ 718.018948] ? arch_trigger_cpumask_backtrace+0x40/0x40 [ 718.024326] arch_trigger_cpumask_backtrace+0x2c/0x40 [ 718.029677] trigger_all_cpu_backtrace+0x2b/0x30 [ 718.034777] watchdog+0x1107/0x1130 [ 718.038421] kthread+0x473/0x4b0 [ 718.041807] ? reset_hung_task_detector+0x30/0x30 [ 718.046653] ? kthread_blkcg+0xf0/0xf0 [ 718.050548] ret_from_fork+0x35/0x40 [ 718.054403] Sending NMI from CPU 0 to CPUs 1: [ 718.059144] ------------[ cut here ]------------ [ 718.064126] kernel BUG at mm/kmsan/kmsan_entry.c:81! [ 718.069464] invalid opcode: 0000 [#1] SMP PTI [ 718.074090] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 4.18.0-rc5+ #29 [ 718.080739] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 718.090235] RIP: 0010:kmsan_nmi_enter+0x42/0x70 [ 718.095018] Code: 00 74 27 65 8b 04 25 80 90 03 00 83 c0 01 83 f8 08 7d 27 65 89 04 25 80 90 03 00 65 c6 04 25 15 6e 0b 00 ff c3 0f 0b 90 eb fe <0f> 0b 66 90 66 2e 0f 1f 84 00 00 00 00 00 eb fe 0f 0b 66 90 66 2e [ 718.114687] RSP: 0018:fffffe0000049ea8 EFLAGS: 00010046 [ 718.120196] RAX: 0000000080000000 RBX: 0000000000000001 RCX: 00000000c0000101 [ 718.127514] RDX: 00000000ffff8802 RSI: ffffffff8a40136c RDI: ffffea0000439620 [ 718.135003] RBP: fffffe0000049ef9 R08: 0000000000000000 R09: 0000000000000000 [ 718.142669] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 [ 718.150046] R13: 0000000000000000 R14: 000000018efac000 R15: 0000000000000000 [ 718.157471] FS: 0000000000000000(0000) GS:ffff88021fd00000(0000) knlGS:0000000000000000 [ 718.165714] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 718.171620] CR2: 00007f1e76606000 CR3: 000000018efac000 CR4: 00000000001406e0 [ 718.178896] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 718.186166] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 718.193434] Call Trace: [ 718.196285] <NMI> [ 718.198518] ? end_repeat_nmi+0x19/0x8e [ 718.202587] ? end_repeat_nmi+0x7/0x8e [ 718.206485] ? __cpuidle_text_start+0x8/0x8 [ 718.210826] ? default_idle+0x210/0x3f0 [ 718.214994] ? default_idle+0x210/0x3f0 [ 718.219009] ? default_idle+0x210/0x3f0 [ 718.223351] </NMI> [ 718.225609] ? __cpuidle_text_start+0x8/0x8 [ 718.230053] ? __cpuidle_text_start+0x8/0x8 [ 718.234393] ? arch_cpu_idle+0x26/0x30 [ 718.238299] ? do_idle+0x36c/0x830 [ 718.241847] ? do_idle+0xc/0x830 [ 718.245242] ? cpu_startup_entry+0x105/0x150 [ 718.250185] ? setup_APIC_timer+0x220/0x220 [ 718.254550] ? start_secondary+0x48b/0x5c0 [ 718.258856] ? secondary_startup_64+0xa5/0xb0 [ 718.263460] Modules linked in: [ 718.266682] Dumping ftrace buffer: [ 718.270220] (ftrace buffer empty) [ 718.273957] ---[ end trace 0bfac63a71edea86 ]--- [ 718.278742] RIP: 0010:kmsan_nmi_enter+0x42/0x70 [ 718.283413] Code: 00 74 27 65 8b 04 25 80 90 03 00 83 c0 01 83 f8 08 7d 27 65 89 04 25 80 90 03 00 65 c6 04 25 15 6e 0b 00 ff c3 0f 0b 90 eb fe <0f> 0b 66 90 66 2e 0f 1f 84 00 00 00 00 00 eb fe 0f 0b 66 90 66 2e [ 718.304525] RSP: 0018:fffffe0000049ea8 EFLAGS: 00010046 [ 718.309956] RAX: 0000000080000000 RBX: 0000000000000001 RCX: 00000000c0000101 [ 718.317268] RDX: 00000000ffff8802 RSI: ffffffff8a40136c RDI: ffffea0000439620 [ 718.324917] RBP: fffffe0000049ef9 R08: 0000000000000000 R09: 0000000000000000 [ 718.332217] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 [ 718.339511] R13: 0000000000000000 R14: 000000018efac000 R15: 0000000000000000 [ 718.346799] FS: 0000000000000000(0000) GS:ffff88021fd00000(0000) knlGS:0000000000000000 [ 718.355201] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 718.361113] CR2: 00007f1e76606000 CR3: 000000018efac000 CR4: 00000000001406e0 [ 718.368392] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 718.375663] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 718.382935] Kernel panic - not syncing: Fatal exception [ 718.388774] Dumping ftrace buffer: [ 718.392308] (ftrace buffer empty) [ 718.396117] Kernel Offset: disabled [ 718.399759] Rebooting in 86400 seconds..