[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 16.553892] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 20.818458] random: sshd: uninitialized urandom read (32 bytes read) [ 21.210117] random: sshd: uninitialized urandom read (32 bytes read) [ 21.953820] random: sshd: uninitialized urandom read (32 bytes read) [ 547.221462] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.16' (ECDSA) to the list of known hosts. [ 552.645868] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 717.791172] INFO: task syz-executor745:4470 blocked for more than 140 seconds. [ 717.799179] Not tainted 4.18.0-rc5-next-20180720+ #12 [ 717.804921] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 717.812931] syz-executor745 D22672 4470 4467 0x00000004 [ 717.818595] Call Trace: [ 717.821216] __schedule+0x87c/0x1ea0 [ 717.824979] ? __sched_text_start+0x8/0x8 [ 717.829152] ? do_raw_spin_trylock+0x1c0/0x1c0 [ 717.833766] ? kasan_check_write+0x14/0x20 [ 717.838035] ? do_raw_spin_lock+0xc1/0x200 [ 717.842289] ? trace_hardirqs_on+0xd/0x10 [ 717.846456] ? prepare_to_wait_event+0x396/0xc70 [ 717.851841] ? prepare_to_wait_exclusive+0x550/0x550 [ 717.856972] ? send_sigio+0x340/0x340 [ 717.860782] ? do_raw_spin_unlock+0xa7/0x2f0 [ 717.865200] ? do_raw_spin_trylock+0x1c0/0x1c0 [ 717.869802] schedule+0xfb/0x450 [ 717.873195] ? lock_downgrade+0x8f0/0x8f0 [ 717.877359] ? __schedule+0x1ea0/0x1ea0 [ 717.881364] ? check_same_owner+0x340/0x340 [ 717.885698] ? do_raw_spin_unlock+0xa7/0x2f0 [ 717.890126] ? replenish_dl_entity.cold.54+0x37/0x37 [ 717.895240] request_wait_answer+0x4c8/0x920 [ 717.899661] ? fuse_read_forget.isra.22+0xdc0/0xdc0 [ 717.904705] ? finish_wait+0x430/0x430 [ 717.908653] ? send_sigio+0x340/0x340 [ 717.912466] ? lock_acquire+0x1e4/0x540 [ 717.916466] ? finish_wait+0x430/0x430 [ 717.920378] ? refcount_inc_not_zero_checked+0x1e5/0x2f0 [ 717.925842] ? finish_wait+0x430/0x430 [ 717.929745] ? do_raw_spin_trylock+0x1c0/0x1c0 [ 717.934352] ? fuse_dev_ioctl+0x430/0x430 [ 717.938513] ? kasan_check_write+0x14/0x20 [ 717.942767] ? do_raw_spin_lock+0xc1/0x200 [ 717.947021] __fuse_request_send+0x12a/0x1d0 [ 717.951455] fuse_request_send+0x62/0xa0 [ 717.955534] fuse_simple_request+0x33d/0x730 [ 717.960050] fuse_lookup_name+0x3ee/0x830 [ 717.964223] ? fuse_valid_type+0xb0/0xb0 [ 717.968305] ? mutex_lock_nested+0x16/0x20 [ 717.972550] fuse_lookup+0xff/0x4c0 [ 717.976191] ? fuse_lookup_name+0x830/0x830 [ 717.980533] ? kasan_check_write+0x14/0x20 [ 717.984778] ? do_raw_spin_lock+0xc1/0x200 [ 717.989032] __lookup_hash+0x12e/0x190 [ 717.992942] filename_create+0x1e5/0x5b0 [ 717.997018] ? kern_path_mountpoint+0x40/0x40 [ 718.001540] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 718.007085] ? getname_flags+0x26e/0x5a0 [ 718.011155] do_mkdirat+0xda/0x310 [ 718.014704] ? __ia32_sys_mknod+0xb0/0xb0 [ 718.018869] ? syscall_slow_exit_work+0x500/0x500 [ 718.023720] __x64_sys_mkdirat+0x76/0xb0 [ 718.027804] do_syscall_64+0x1b9/0x820 [ 718.031709] ? finish_task_switch+0x1d3/0x870 [ 718.036218] ? syscall_return_slowpath+0x5e0/0x5e0 [ 718.041242] ? syscall_return_slowpath+0x31d/0x5e0 [ 718.046179] ? prepare_exit_to_usermode+0x3b0/0x3b0 [ 718.051213] ? prepare_exit_to_usermode+0x291/0x3b0 [ 718.056239] ? perf_trace_sys_enter+0xb10/0xb10 [ 718.060928] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 718.065815] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 718.071064] RIP: 0033:0x445849 [ 718.074288] Code: e8 7c b7 02 00 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 12 fc ff c3 66 2e 0f 1f 84 00 00 00 00 [ 718.093442] RSP: 002b:00007ff243259da8 EFLAGS: 00000293 ORIG_RAX: 0000000000000102 [ 718.101176] RAX: ffffffffffffffda RBX: 00000000006dac24 RCX: 0000000000445849 [ 718.108454] RDX: 0000000000000000 RSI: 0000000020000500 RDI: 00000000ffffff9c [ 718.115795] RBP: 00000000006dac20 R08: 0000000000000000 R09: 0000000000000000 [ 718.123078] R10: 0000000000000000 R11: 0000000000000293 R12: 0030656c69662f2e [ 718.130361] R13: 65646f6d746f6f72 R14: 2f30656c69662f2e R15: 0000000000000008 [ 718.137656] INFO: task syz-executor745:4471 blocked for more than 140 seconds. [ 718.145030] Not tainted 4.18.0-rc5-next-20180720+ #12 [ 718.150747] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 718.158745] syz-executor745 D25408 4471 4467 0x00000004 [ 718.164561] Call Trace: [ 718.167169] __schedule+0x87c/0x1ea0 [ 718.170897] ? lock_downgrade+0x8f0/0x8f0 [ 718.175062] ? __sched_text_start+0x8/0x8 [ 718.179233] ? d_alloc_cursor+0xe0/0xe0 [ 718.183232] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 718.188789] ? __follow_mount_rcu.isra.35.part.36+0x175/0x890 [ 718.194703] ? trailing_symlink+0x980/0x980 [ 718.199041] schedule+0xfb/0x450 [ 718.202417] ? lock_downgrade+0x8f0/0x8f0 [ 718.206579] ? __schedule+0x1ea0/0x1ea0 [ 718.210563] ? kasan_check_read+0x11/0x20 [ 718.214720] ? do_raw_spin_unlock+0xa7/0x2f0 [ 718.219146] ? do_raw_spin_trylock+0x1c0/0x1c0 [ 718.223747] ? kasan_check_write+0x14/0x20 [ 718.228013] ? do_raw_spin_lock+0xc1/0x200 [ 718.232287] __rwsem_down_write_failed_common+0x95d/0x1630 [ 718.237929] ? rwsem_spin_on_owner+0xa40/0xa40 [ 718.242880] ? path_parentat.isra.43+0x20/0x160 [ 718.247562] ? trace_hardirqs_on+0x10/0x10 [ 718.251812] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 718.256845] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 718.262424] ? security_inode_permission+0xd2/0x100 [ 718.267465] ? lock_acquire+0x1e4/0x540 [ 718.271461] ? lockref_get_not_dead+0x70/0x90 [ 718.275992] ? lock_downgrade+0x8f0/0x8f0 [ 718.280159] ? link_path_walk.part.42+0xcc8/0x1540 [ 718.285103] ? lock_downgrade+0x8f0/0x8f0 [ 718.289259] ? do_raw_spin_trylock+0x1c0/0x1c0 [ 718.293850] ? kasan_check_write+0x14/0x20 [ 718.298113] ? do_raw_spin_lock+0xc1/0x200 [ 718.302364] ? dput.part.26+0x276/0x7a0 [ 718.306354] ? shrink_dcache_sb+0x350/0x350 [ 718.310691] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 718.315737] ? mntput+0x74/0xa0 [ 718.319032] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 718.324593] ? terminate_walk+0x20a/0x5e0 [ 718.328772] ? lock_acquire+0x1e4/0x540 [ 718.332761] ? filename_create+0x1b2/0x5b0 [ 718.337004] ? mnt_want_write+0x3f/0xc0 [ 718.341006] ? lock_release+0xa30/0xa30 [ 718.345037] ? check_same_owner+0x340/0x340 [ 718.349384] rwsem_down_write_failed+0xe/0x10 [ 718.353890] ? rwsem_down_write_failed+0xe/0x10 [ 718.358580] call_rwsem_down_write_failed+0x17/0x30 [ 718.363612] down_write_nested+0xae/0x130 [ 718.367789] ? filename_create+0x1b2/0x5b0 [ 718.372033] ? _down_write_nest_lock+0x130/0x130 [ 718.376803] ? __sb_start_write+0x17f/0x300 [ 718.381147] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 718.386698] filename_create+0x1b2/0x5b0 [ 718.390769] ? kern_path_mountpoint+0x40/0x40 [ 718.395286] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 718.400849] ? getname_flags+0x26e/0x5a0 [ 718.404935] do_mkdirat+0xda/0x310 [ 718.408484] ? __ia32_sys_mknod+0xb0/0xb0 [ 718.412657] __x64_sys_mkdirat+0x76/0xb0 [ 718.416736] do_syscall_64+0x1b9/0x820 [ 718.420653] ? syscall_return_slowpath+0x5e0/0x5e0 [ 718.425594] ? syscall_return_slowpath+0x31d/0x5e0 [ 718.430546] ? prepare_exit_to_usermode+0x3b0/0x3b0 [ 718.435575] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 718.440438] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 718.445635] RIP: 0033:0x445849 [ 718.448842] Code: e8 7c b7 02 00 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 12 fc ff c3 66 2e 0f 1f 84 00 00 00 00 [ 718.468032] RSP: 002b:00007ff243238da8 EFLAGS: 00000293 ORIG_RAX: 0000000000000102 [ 718.475756] RAX: ffffffffffffffda RBX: 00000000006dac3c RCX: 0000000000445849 [ 718.483042] RDX: 0000000000000000 RSI: 0000000020000500 RDI: 00000000ffffff9c [ 718.490332] RBP: 00000000006dac38 R08: 0000000000000000 R09: 0000000000000000 [ 718.497626] R10: 0000000000000000 R11: 0000000000000293 R12: 0030656c69662f2e [ 718.504931] R13: 65646f6d746f6f72 R14: 2f30656c69662f2e R15: 0000000000000008 [ 718.512244] INFO: lockdep is turned off. [ 718.516327] NMI backtrace for cpu 1 [ 718.519978] CPU: 1 PID: 901 Comm: khungtaskd Not tainted 4.18.0-rc5-next-20180720+ #12 [ 718.528013] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 718.537373] Call Trace: [ 718.539948] dump_stack+0x1c9/0x2b4 [ 718.543558] ? dump_stack_print_info.cold.2+0x52/0x52 [ 718.548741] ? vprintk_default+0x28/0x30 [ 718.552780] ? lapic_can_unplug_cpu.cold.28+0x3f/0x3f [ 718.557952] nmi_cpu_backtrace.cold.3+0x48/0x88 [ 718.562635] ? lapic_can_unplug_cpu.cold.28+0x3f/0x3f [ 718.567804] nmi_trigger_cpumask_backtrace+0x151/0x192 [ 718.573057] arch_trigger_cpumask_backtrace+0x14/0x20 [ 718.578223] watchdog+0xb39/0x10b0 [ 718.581741] ? reset_hung_task_detector+0xd0/0xd0 [ 718.586573] ? kasan_check_read+0x11/0x20 [ 718.590700] ? do_raw_spin_unlock+0xa7/0x2f0 [ 718.595090] ? _raw_spin_unlock_irqrestore+0x74/0xc0 [ 718.600179] ? __kthread_parkme+0x58/0x1b0 [ 718.604487] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 718.609490] ? trace_hardirqs_on+0xd/0x10 [ 718.613621] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 718.619147] ? __kthread_parkme+0x106/0x1b0 [ 718.623448] kthread+0x345/0x410 [ 718.626793] ? reset_hung_task_detector+0xd0/0xd0 [ 718.631694] ? kthread_bind+0x40/0x40 [ 718.635718] ret_from_fork+0x3a/0x50 [ 718.639472] Sending NMI from CPU 1 to CPUs 0: [ 718.644044] NMI backtrace for cpu 0 skipped: idling at native_safe_halt+0x6/0x10 [ 718.644989] Kernel panic - not syncing: hung_task: blocked tasks [ 718.657779] CPU: 1 PID: 901 Comm: khungtaskd Not tainted 4.18.0-rc5-next-20180720+ #12 [ 718.665819] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 718.675163] Call Trace: [ 718.677737] dump_stack+0x1c9/0x2b4 [ 718.681357] ? dump_stack_print_info.cold.2+0x52/0x52 [ 718.686529] ? printk_safe_log_store+0x2f0/0x2f0 [ 718.691264] panic+0x238/0x4e7 [ 718.694436] ? add_taint.cold.5+0x16/0x16 [ 718.698564] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 718.704094] ? nmi_trigger_cpumask_backtrace+0x13a/0x192 [ 718.709522] ? printk_safe_flush+0xd7/0x130 [ 718.713853] watchdog+0xb4a/0x10b0 [ 718.717404] ? reset_hung_task_detector+0xd0/0xd0 [ 718.722245] ? kasan_check_read+0x11/0x20 [ 718.726377] ? do_raw_spin_unlock+0xa7/0x2f0 [ 718.730767] ? _raw_spin_unlock_irqrestore+0x74/0xc0 [ 718.735849] ? __kthread_parkme+0x58/0x1b0 [ 718.740074] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 718.745068] ? trace_hardirqs_on+0xd/0x10 [ 718.749206] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 718.754736] ? __kthread_parkme+0x106/0x1b0 [ 718.759054] kthread+0x345/0x410 [ 718.762400] ? reset_hung_task_detector+0xd0/0xd0 [ 718.767219] ? kthread_bind+0x40/0x40 [ 718.771000] ret_from_fork+0x3a/0x50 [ 718.775230] Dumping ftrace buffer: [ 718.778746] (ftrace buffer empty) [ 718.782443] Kernel Offset: disabled [ 718.786057] Rebooting in 86400 seconds..