[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 19.753080] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 22.634853] random: sshd: uninitialized urandom read (32 bytes read) [ 22.939009] random: sshd: uninitialized urandom read (32 bytes read) [ 23.798860] random: sshd: uninitialized urandom read (32 bytes read) [ 23.955161] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.43' (ECDSA) to the list of known hosts. [ 29.745193] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 29.838591] BUG: unable to handle kernel paging request at ffffebe000000008 [ 29.845723] PGD 0 P4D 0 [ 29.848383] Oops: 0000 [#1] SMP KASAN [ 29.852171] CPU: 0 PID: 4570 Comm: syz-executor393 Not tainted 4.18.0-rc4+ #144 [ 29.859608] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 29.868958] RIP: 0010:kfree+0xa0/0x260 [ 29.872838] Code: 82 cb 01 00 00 48 ba 00 00 00 80 ff 77 00 00 48 01 c2 48 89 df 48 b8 00 00 00 00 00 ea ff ff 48 c1 ea 0c 48 c1 e2 06 48 01 c2 <48> 8b 42 08 a8 01 48 8d 48 ff 48 0f 45 d1 4c 8b 6a 18 49 63 75 74 [ 29.891963] RSP: 0018:ffff8801d88d7520 EFLAGS: 00010086 [ 29.897309] RAX: ffffea0000000000 RBX: 0000000000000286 RCX: 0000000000000000 [ 29.904557] RDX: ffffebe000000000 RSI: 0000000000000000 RDI: 0000000000000286 [ 29.911806] RBP: ffff8801d88d7540 R08: ffffed003b5c46d7 R09: ffffed003b5c46d6 [ 29.919053] R10: ffffed003b5c46d6 R11: ffff8801dae236b3 R12: 0000000000000286 [ 29.926309] R13: ffffffff8766d6c3 R14: ffff8801d88d7690 R15: ffff8801ac270380 [ 29.933569] FS: 0000000000d6e880(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000 [ 29.941772] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 29.947630] CR2: ffffebe000000008 CR3: 00000001d8f48000 CR4: 00000000001406f0 [ 29.954880] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 29.962129] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 29.969387] Call Trace: [ 29.971964] p9_client_create+0xf43/0x16c9 [ 29.976179] ? p9_client_read+0xc60/0xc60 [ 29.980309] ? find_held_lock+0x36/0x1c0 [ 29.984357] ? __lockdep_init_map+0x105/0x590 [ 29.988834] ? kasan_check_write+0x14/0x20 [ 29.993057] ? __init_rwsem+0x1cc/0x2a0 [ 29.997025] ? do_raw_write_unlock.cold.8+0x49/0x49 [ 30.002056] ? rcu_read_lock_sched_held+0x108/0x120 [ 30.007058] ? __kmalloc_track_caller+0x5f5/0x760 [ 30.011885] ? save_stack+0xa9/0xd0 [ 30.015491] ? save_stack+0x43/0xd0 [ 30.019107] ? kasan_kmalloc+0xc4/0xe0 [ 30.022972] ? kmem_cache_alloc_trace+0x152/0x780 [ 30.027792] ? memcpy+0x45/0x50 [ 30.031059] v9fs_session_init+0x21a/0x1a80 [ 30.035363] ? find_held_lock+0x36/0x1c0 [ 30.039408] ? v9fs_show_options+0x7e0/0x7e0 [ 30.043798] ? kasan_check_read+0x11/0x20 [ 30.047927] ? rcu_is_watching+0x8c/0x150 [ 30.052066] ? rcu_pm_notify+0xc0/0xc0 [ 30.055937] ? v9fs_mount+0x61/0x900 [ 30.059631] ? rcu_read_lock_sched_held+0x108/0x120 [ 30.064627] ? kmem_cache_alloc_trace+0x616/0x780 [ 30.069453] ? __sanitizer_cov_trace_const_cmp2+0x18/0x20 [ 30.074976] v9fs_mount+0x7c/0x900 [ 30.078501] mount_fs+0xae/0x328 [ 30.081849] vfs_kern_mount.part.34+0xdc/0x4e0 [ 30.086411] ? may_umount+0xb0/0xb0 [ 30.090029] ? _raw_read_unlock+0x22/0x30 [ 30.094162] ? __get_fs_type+0x97/0xc0 [ 30.098036] do_mount+0x581/0x30e0 [ 30.101568] ? copy_mount_string+0x40/0x40 [ 30.105782] ? copy_mount_options+0x5f/0x380 [ 30.110172] ? rcu_read_lock_sched_held+0x108/0x120 [ 30.115180] ? kmem_cache_alloc_trace+0x616/0x780 [ 30.120010] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 30.125538] ? _copy_from_user+0xdf/0x150 [ 30.129679] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 30.135197] ? copy_mount_options+0x285/0x380 [ 30.139682] ksys_mount+0x12d/0x140 [ 30.143289] __x64_sys_mount+0xbe/0x150 [ 30.147257] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 30.152264] do_syscall_64+0x1b9/0x820 [ 30.156142] ? syscall_return_slowpath+0x5e0/0x5e0 [ 30.161593] ? syscall_return_slowpath+0x31d/0x5e0 [ 30.166519] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 30.172041] ? retint_user+0x18/0x18 [ 30.175738] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 30.180562] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 30.185729] RIP: 0033:0x440179 [ 30.188893] Code: 18 89 d0 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 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 fb 13 fc ff c3 66 2e 0f 1f 84 00 00 00 00 [ 30.208043] RSP: 002b:00007ffeb7500558 EFLAGS: 00000202 ORIG_RAX: 00000000000000a5 [ 30.215744] RAX: ffffffffffffffda RBX: 0030656c69662f2e RCX: 0000000000440179 [ 30.222994] RDX: 0000000020000340 RSI: 00000000200000c0 RDI: 0000000000000000 [ 30.230260] RBP: 00000000006ca018 R08: 0000000020000540 R09: 00000000004002c8 [ 30.237524] R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000401a00 [ 30.244775] R13: 0000000000401a90 R14: 0000000000000000 R15: 0000000000000000 [ 30.252034] Modules linked in: [ 30.255207] Dumping ftrace buffer: [ 30.258721] (ftrace buffer empty) [ 30.262419] CR2: ffffebe000000008 [ 30.265857] ---[ end trace 29414009c89adaf9 ]--- [ 30.270599] RIP: 0010:kfree+0xa0/0x260 [ 30.274461] Code: 82 cb 01 00 00 48 ba 00 00 00 80 ff 77 00 00 48 01 c2 48 89 df 48 b8 00 00 00 00 00 ea ff ff 48 c1 ea 0c 48 c1 e2 06 48 01 c2 <48> 8b 42 08 a8 01 48 8d 48 ff 48 0f 45 d1 4c 8b 6a 18 49 63 75 74 [ 30.293577] RSP: 0018:ffff8801d88d7520 EFLAGS: 00010086 [ 30.298920] RAX: ffffea0000000000 RBX: 0000000000000286 RCX: 0000000000000000 [ 30.306179] RDX: ffffebe000000000 RSI: 0000000000000000 RDI: 0000000000000286 [ 30.313429] RBP: ffff8801d88d7540 R08: ffffed003b5c46d7 R09: ffffed003b5c46d6 [ 30.320690] R10: ffffed003b5c46d6 R11: ffff8801dae236b3 R12: 0000000000000286 [ 30.327937] R13: ffffffff8766d6c3 R14: ffff8801d88d7690 R15: ffff8801ac270380 [ 30.335185] FS: 0000000000d6e880(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000 [ 30.343390] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 30.349248] CR2: ffffebe000000008 CR3: 00000001d8f48000 CR4: 00000000001406f0 [ 30.356498] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 30.363748] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 30.370997] Kernel panic - not syncing: Fatal exception [ 30.376798] Dumping ftrace buffer: [ 30.380316] (ftrace buffer empty) [ 30.384004] Kernel Offset: disabled [ 30.387613] Rebooting in 86400 seconds..