[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 18.341389] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 23.893655] random: sshd: uninitialized urandom read (32 bytes read) [ 24.225142] random: sshd: uninitialized urandom read (32 bytes read) [ 25.071332] random: sshd: uninitialized urandom read (32 bytes read) [ 25.223442] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.1' (ECDSA) to the list of known hosts. [ 30.645255] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 30.734759] BUG: unable to handle kernel paging request at ffffebe000000008 [ 30.741896] PGD 0 P4D 0 [ 30.744551] Oops: 0000 [#1] SMP KASAN [ 30.748329] CPU: 0 PID: 4514 Comm: syz-executor385 Not tainted 4.18.0-rc4+ #139 [ 30.755749] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 30.765091] RIP: 0010:kfree+0xa0/0x260 [ 30.768951] 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 [ 30.788081] RSP: 0018:ffff8801d9597520 EFLAGS: 00010086 [ 30.793424] RAX: ffffea0000000000 RBX: 0000000000000286 RCX: 0000000000000000 [ 30.800669] RDX: ffffebe000000000 RSI: 0000000000000000 RDI: 0000000000000286 [ 30.807917] RBP: ffff8801d9597540 R08: ffffed003b5c46d7 R09: ffffed003b5c46d6 [ 30.815161] R10: ffffed003b5c46d6 R11: ffff8801dae236b3 R12: 0000000000000286 [ 30.822410] R13: ffffffff8766d6c3 R14: ffff8801d9597690 R15: ffff8801c6908340 [ 30.829670] FS: 000000000167f880(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000 [ 30.837873] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 30.843732] CR2: ffffebe000000008 CR3: 00000001d9108000 CR4: 00000000001406f0 [ 30.850981] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 30.858227] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 30.865472] Call Trace: [ 30.868049] p9_client_create+0xf43/0x16c9 [ 30.872266] ? p9_client_read+0xc60/0xc60 [ 30.876392] ? find_held_lock+0x36/0x1c0 [ 30.880435] ? __lockdep_init_map+0x105/0x590 [ 30.884912] ? kasan_check_write+0x14/0x20 [ 30.889125] ? __init_rwsem+0x1cc/0x2a0 [ 30.893079] ? do_raw_write_unlock.cold.8+0x49/0x49 [ 30.898076] ? rcu_read_lock_sched_held+0x108/0x120 [ 30.903073] ? __kmalloc_track_caller+0x5f5/0x760 [ 30.907893] ? save_stack+0xa9/0xd0 [ 30.911499] ? save_stack+0x43/0xd0 [ 30.915104] ? kasan_kmalloc+0xc4/0xe0 [ 30.918967] ? kmem_cache_alloc_trace+0x152/0x780 [ 30.923799] ? memcpy+0x45/0x50 [ 30.927062] v9fs_session_init+0x21a/0x1a80 [ 30.931362] ? find_held_lock+0x36/0x1c0 [ 30.935403] ? v9fs_show_options+0x7e0/0x7e0 [ 30.939792] ? kasan_check_read+0x11/0x20 [ 30.943917] ? rcu_is_watching+0x8c/0x150 [ 30.948047] ? rcu_pm_notify+0xc0/0xc0 [ 30.951915] ? v9fs_mount+0x61/0x900 [ 30.955607] ? rcu_read_lock_sched_held+0x108/0x120 [ 30.960605] ? kmem_cache_alloc_trace+0x616/0x780 [ 30.965431] ? __sanitizer_cov_trace_const_cmp2+0x18/0x20 [ 30.970947] v9fs_mount+0x7c/0x900 [ 30.974467] mount_fs+0xae/0x328 [ 30.977815] vfs_kern_mount.part.34+0xdc/0x4e0 [ 30.982374] ? may_umount+0xb0/0xb0 [ 30.986243] ? _raw_read_unlock+0x22/0x30 [ 30.990369] ? __get_fs_type+0x97/0xc0 [ 30.994236] do_mount+0x581/0x30e0 [ 30.997765] ? copy_mount_string+0x40/0x40 [ 31.001989] ? copy_mount_options+0x5f/0x380 [ 31.006383] ? rcu_read_lock_sched_held+0x108/0x120 [ 31.011377] ? kmem_cache_alloc_trace+0x616/0x780 [ 31.016199] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 31.021715] ? _copy_from_user+0xdf/0x150 [ 31.025841] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 31.031357] ? copy_mount_options+0x285/0x380 [ 31.035830] ksys_mount+0x12d/0x140 [ 31.039435] __x64_sys_mount+0xbe/0x150 [ 31.043389] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 31.048384] do_syscall_64+0x1b9/0x820 [ 31.052248] ? syscall_return_slowpath+0x5e0/0x5e0 [ 31.057156] ? syscall_return_slowpath+0x31d/0x5e0 [ 31.062066] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 31.067580] ? retint_user+0x18/0x18 [ 31.071273] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 31.076095] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 31.081262] RIP: 0033:0x440149 [ 31.084427] 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 [ 31.103539] RSP: 002b:00007ffcdb1a3638 EFLAGS: 00000202 ORIG_RAX: 00000000000000a5 [ 31.111224] RAX: ffffffffffffffda RBX: 0030656c69662f2e RCX: 0000000000440149 [ 31.118470] RDX: 0000000020000340 RSI: 00000000200000c0 RDI: 0000000000000000 [ 31.125715] RBP: 00000000006ca018 R08: 00000000200001c0 R09: 00000000004002c8 [ 31.132961] R10: 0000000000000000 R11: 0000000000000202 R12: 00000000004019d0 [ 31.140205] R13: 0000000000401a60 R14: 0000000000000000 R15: 0000000000000000 [ 31.147453] Modules linked in: [ 31.150628] Dumping ftrace buffer: [ 31.154142] (ftrace buffer empty) [ 31.157829] CR2: ffffebe000000008 [ 31.161261] ---[ end trace 52446d024d7d2acc ]--- [ 31.165998] RIP: 0010:kfree+0xa0/0x260 [ 31.169862] 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 [ 31.188986] RSP: 0018:ffff8801d9597520 EFLAGS: 00010086 [ 31.194329] RAX: ffffea0000000000 RBX: 0000000000000286 RCX: 0000000000000000 [ 31.201575] RDX: ffffebe000000000 RSI: 0000000000000000 RDI: 0000000000000286 [ 31.208821] RBP: ffff8801d9597540 R08: ffffed003b5c46d7 R09: ffffed003b5c46d6 [ 31.216067] R10: ffffed003b5c46d6 R11: ffff8801dae236b3 R12: 0000000000000286 [ 31.223313] R13: ffffffff8766d6c3 R14: ffff8801d9597690 R15: ffff8801c6908340 [ 31.230562] FS: 000000000167f880(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000 [ 31.238775] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 31.244633] CR2: ffffebe000000008 CR3: 00000001d9108000 CR4: 00000000001406f0 [ 31.251881] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 31.259128] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 31.266377] Kernel panic - not syncing: Fatal exception [ 31.271765] Dumping ftrace buffer: [ 31.275280] (ftrace buffer empty) [ 31.278966] Kernel Offset: disabled [ 31.282570] Rebooting in 86400 seconds..