[....] Starting periodic command scheduler: cron[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 14.777582] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c[ 14.845719] random: sshd: uninitialized urandom read (32 bytes read) . [ 15.327324] random: sshd: uninitialized urandom read (32 bytes read) Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 16.297582] random: sshd: uninitialized urandom read (32 bytes read) [ 16.444038] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.33' (ECDSA) to the list of known hosts. [ 21.887950] random: sshd: uninitialized urandom read (32 bytes read) executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 21.979136] 9pnet_virtio: no channels available for device (null) [ 21.983963] 9pnet_virtio: no channels available for device (null) [ 21.988081] 9pnet_virtio: no channels available for device (null) [ 21.990994] 9pnet_virtio: no channels available for device (null) [ 21.991164] 9pnet_virtio: no channels available for device (null) [ 21.991319] 9pnet_virtio: no channels available for device (null) [ 21.991724] 9pnet_virtio: no channels available for device (null) [ 21.994775] 9pnet: p9_fd_create_tcp (3807): problem connecting socket to 127.0.0.1 [ 21.994786] 9pnet: p9_fd_create_tcp (3805): problem connecting socket to 127.0.0.1 [ 21.995351] 9pnet: p9_fd_create_tcp (3806): problem connecting socket to 127.0.0.1 [ 21.996702] kasan: CONFIG_KASAN_INLINE enabled [ 21.996704] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 21.996714] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 21.996719] Dumping ftrace buffer: [ 21.996723] (ftrace buffer empty) [ 21.996727] Modules linked in: [ 21.996735] CPU: 0 PID: 3807 Comm: syz-executor042 Not tainted 4.9.111-g03c70fe #6 [ 21.996738] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 21.996743] task: ffff8801b6d9e000 task.stack: ffff8801d9628000 [ 21.996761] RIP: 0010:[] [] vsscanf+0x33f/0x2430 [ 21.996764] RSP: 0018:ffff8801d962f4e8 EFLAGS: 00010246 [ 21.996768] RAX: 0000000000000000 RBX: ffffffff841a2801 RCX: 0000000000000000 [ 21.996772] RDX: 0000000000000000 RSI: ffffffff81eda1e2 RDI: ffffffff841a2800 [ 21.996776] RBP: ffff8801d962f698 R08: ffff8801d962f860 R09: ffff8801d962f864 [ 21.996779] R10: 0000000000000000 R11: 0000000000000000 R12: ffffffff841a2801 [ 21.996782] R13: 0000000000000064 R14: dffffc0000000000 R15: 0000000000000000 [ 21.996788] FS: 00007f13a19b5700(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 21.996792] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 21.996795] CR2: 000000000046a3f0 CR3: 00000001c95ee000 CR4: 00000000001606f0 [ 21.996804] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 21.996808] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 21.996809] Stack: [ 21.996820] ffff8801b6d9e000 fffffbfff07c45e9 1ffff1003b2c5ea6 0000000000000000 [ 21.996828] 00000000000002ff 00000000d962f530 ffffffff8123ffff ffff8801d962f6c8 [ 21.996836] ffffffff841a2864 0000000041b58ab3 ffffffff843e3698 ffffffff81ed9eb0 [ 21.996838] Call Trace: [ 21.996852] [] ? rt_mutex_enqueue+0x10f/0x2f0 [ 21.996861] [] ? simple_strtoll+0xa0/0xa0 [ 21.996870] [] ? parse_opts.part.1+0x252/0x320 [ 21.996879] [] ? kasan_slab_free+0x88/0xc0 [ 21.996887] [] ? kfree+0xfb/0x310 [ 21.996894] [] ? parse_opts.part.1+0x257/0x320 [ 21.996903] [] ? p9_read_work+0xac0/0xac0 [ 21.996910] [] ? p9_client_create+0x673/0x10a0 [ 21.996914] 9pnet: p9_fd_create_tcp (3808): problem connecting socket to 127.0.0.1 [ 21.996923] [] ? v9fs_mount+0x7d/0x810 [ 21.996933] [] ? mount_fs+0x28c/0x370 [ 21.996941] [] ? vfs_kern_mount.part.29+0xd1/0x3d0 [ 21.996949] [] ? do_mount+0x3c9/0x2740 [ 21.996955] [] sscanf+0xab/0xe0 [ 21.996962] [] ? vsscanf+0x2430/0x2430 [ 21.996968] [] p9_fd_create_tcp+0x127/0x430 [ 21.996974] [] ? p9_fd_create_unix+0x260/0x260 [ 21.996984] [] ? check_preemption_disabled+0x3b/0x170 [ 21.996991] [] ? trace_hardirqs_on_caller+0x38b/0x590 [ 21.996998] [] ? lockdep_init_map+0x105/0x4f0 [ 21.997004] [] ? __raw_spin_lock_init+0x2d/0x100 [ 21.997011] [] p9_client_create+0x6ff/0x10a0 [ 21.997018] [] ? p9_client_zc_rpc.constprop.11+0x1020/0x1020 [ 21.997029] [] ? rcu_read_lock_sched_held+0x103/0x120 [ 21.997038] [] ? bdi_register+0xb4/0x570 [ 21.997045] [] ? bdi_init+0x7ae/0xab0 [ 21.997053] [] v9fs_session_init+0x333/0x13a0 [ 21.997065] [] ? _raw_spin_unlock_irqrestore+0x45/0x70 [ 21.997072] [] ? debug_check_no_obj_freed+0x2ec/0x930 [ 21.997078] [] ? v9fs_inode_init_once+0x30/0x30 [ 21.997086] [] ? debug_object_activate+0x4e0/0x4e0 [ 21.997093] [] ? trace_hardirqs_on_caller+0x38b/0x590 [ 21.997101] [] ? free_hot_cold_page+0x493/0x840 [ 21.997108] [] ? check_preemption_disabled+0x3b/0x170 [ 21.997116] [] ? kasan_unpoison_shadow+0x35/0x50 [ 21.997122] [] ? kasan_kmalloc+0xc7/0xe0 [ 21.997130] [] ? kmem_cache_alloc_trace+0xfd/0x2b0 [ 21.997137] [] ? v9fs_mount+0x62/0x810 [ 21.997143] [] v9fs_mount+0x7d/0x810 [ 21.997151] [] mount_fs+0x28c/0x370 [ 21.997158] [] vfs_kern_mount.part.29+0xd1/0x3d0 [ 21.997168] [] ? ns_capable_common+0x12a/0x150 [ 21.997175] [] do_mount+0x3c9/0x2740 [ 21.997183] [] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 21.997190] [] ? copy_mount_string+0x40/0x40 [ 21.997196] [] ? copy_mount_options+0x192/0x320 [ 21.997202] [] ? copy_mount_options+0x198/0x320 [ 21.997208] [] ? copy_mount_options+0x1e5/0x320 [ 21.997214] [] SyS_mount+0xfe/0x110 [ 21.997220] [] ? copy_mnt_ns+0x8e0/0x8e0 [ 21.997225] [] do_syscall_64+0x1a6/0x490 [ 21.997231] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 21.997330] Code: ff 45 84 ed 0f 84 c9 fe ff ff e8 3d 48 48 ff 41 80 fd 6e 0f 84 34 02 00 00 e8 2e 48 48 ff 4c 89 f8 4c 89 fa 48 c1 e8 03 83 e2 07 <42> 0f b6 04 30 38 d0 7f 08 84 c0 0f 85 dd 17 00 00 41 80 3f 00 [ 21.997338] RIP [] vsscanf+0x33f/0x2430 [ 21.997340] RSP [ 21.997821] ---[ end trace 0dd333581cd71421 ]--- [ 21.997826] Kernel panic - not syncing: Fatal exception [ 21.998430] Dumping ftrace buffer: [ 21.998434] (ftrace buffer empty) [ 21.998437] Kernel Offset: disabled [ 22.592252] Rebooting in 86400 seconds..