[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 20.661514] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 25.288395] random: sshd: uninitialized urandom read (32 bytes read) [ 25.766146] random: sshd: uninitialized urandom read (32 bytes read) [ 26.617823] random: sshd: uninitialized urandom read (32 bytes read) [ 26.777477] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.34' (ECDSA) to the list of known hosts. [ 32.219625] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 32.314254] BUG: unable to handle kernel paging request at ffffebe000000008 [ 32.321439] PGD 0 P4D 0 [ 32.324105] Oops: 0000 [#1] SMP KASAN [ 32.327917] CPU: 1 PID: 4573 Comm: syz-executor587 Not tainted 4.18.0-rc4+ #141 [ 32.335347] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 32.344710] RIP: 0010:kfree+0xa0/0x260 [ 32.348604] 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 [ 32.367736] RSP: 0018:ffff8801acb8f520 EFLAGS: 00010086 [ 32.373085] RAX: ffffea0000000000 RBX: 0000000000000286 RCX: 0000000000000000 [ 32.380338] RDX: ffffebe000000000 RSI: 0000000000000000 RDI: 0000000000000286 [ 32.387589] RBP: ffff8801acb8f540 R08: ffffed003b5e46d7 R09: ffffed003b5e46d6 [ 32.394860] R10: ffffed003b5e46d6 R11: ffff8801daf236b3 R12: 0000000000000286 [ 32.402142] R13: ffffffff8766d6c3 R14: ffff8801acb8f690 R15: ffff8801ac440380 [ 32.409433] FS: 0000000002282880(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000 [ 32.417652] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 32.423517] CR2: ffffebe000000008 CR3: 00000001d886a000 CR4: 00000000001406e0 [ 32.430773] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 32.438031] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 32.445294] Call Trace: [ 32.447884] p9_client_create+0xf43/0x16c9 [ 32.452119] ? p9_client_read+0xc60/0xc60 [ 32.456255] ? find_held_lock+0x36/0x1c0 [ 32.460313] ? __lockdep_init_map+0x105/0x590 [ 32.464796] ? kasan_check_write+0x14/0x20 [ 32.469275] ? __init_rwsem+0x1cc/0x2a0 [ 32.473231] ? do_raw_write_unlock.cold.8+0x49/0x49 [ 32.478244] ? rcu_read_lock_sched_held+0x108/0x120 [ 32.483268] ? __kmalloc_track_caller+0x5f5/0x760 [ 32.488113] ? save_stack+0xa9/0xd0 [ 32.491730] ? save_stack+0x43/0xd0 [ 32.495341] ? kasan_kmalloc+0xc4/0xe0 [ 32.499208] ? kmem_cache_alloc_trace+0x152/0x780 [ 32.504042] ? memcpy+0x45/0x50 [ 32.507313] v9fs_session_init+0x21a/0x1a80 [ 32.511628] ? find_held_lock+0x36/0x1c0 [ 32.515677] ? v9fs_show_options+0x7e0/0x7e0 [ 32.520075] ? kasan_check_read+0x11/0x20 [ 32.524204] ? rcu_is_watching+0x8c/0x150 [ 32.528341] ? rcu_pm_notify+0xc0/0xc0 [ 32.532212] ? v9fs_mount+0x61/0x900 [ 32.535908] ? rcu_read_lock_sched_held+0x108/0x120 [ 32.540907] ? kmem_cache_alloc_trace+0x616/0x780 [ 32.545747] ? __sanitizer_cov_trace_const_cmp2+0x18/0x20 [ 32.551270] v9fs_mount+0x7c/0x900 [ 32.554797] mount_fs+0xae/0x328 [ 32.558148] vfs_kern_mount.part.34+0xdc/0x4e0 [ 32.562709] ? may_umount+0xb0/0xb0 [ 32.566317] ? _raw_read_unlock+0x22/0x30 [ 32.570460] ? __get_fs_type+0x97/0xc0 [ 32.574339] do_mount+0x581/0x30e0 [ 32.577870] ? copy_mount_string+0x40/0x40 [ 32.582095] ? copy_mount_options+0x5f/0x380 [ 32.586489] ? rcu_read_lock_sched_held+0x108/0x120 [ 32.591499] ? kmem_cache_alloc_trace+0x616/0x780 [ 32.596326] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 32.601851] ? _copy_from_user+0xdf/0x150 [ 32.605982] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 32.611502] ? copy_mount_options+0x285/0x380 [ 32.615976] ksys_mount+0x12d/0x140 [ 32.619586] __x64_sys_mount+0xbe/0x150 [ 32.623546] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 32.628553] do_syscall_64+0x1b9/0x820 [ 32.632424] ? syscall_slow_exit_work+0x500/0x500 [ 32.637259] ? syscall_return_slowpath+0x5e0/0x5e0 [ 32.642181] ? syscall_return_slowpath+0x31d/0x5e0 [ 32.647100] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 32.652623] ? retint_user+0x18/0x18 [ 32.656322] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 32.661166] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 32.666358] RIP: 0033:0x440149 [ 32.669536] 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 [ 32.688667] RSP: 002b:00007fffaa084548 EFLAGS: 00000206 ORIG_RAX: 00000000000000a5 [ 32.696374] RAX: ffffffffffffffda RBX: 0030656c69662f2e RCX: 0000000000440149 [ 32.703644] RDX: 0000000020000340 RSI: 00000000200000c0 RDI: 0000000000000000 [ 32.710913] RBP: 00000000006ca018 R08: 00000000200001c0 R09: 00000000004002c8 [ 32.718165] R10: 0000000000000000 R11: 0000000000000206 R12: 00000000004019d0 [ 32.725414] R13: 0000000000401a60 R14: 0000000000000000 R15: 0000000000000000 [ 32.732677] Modules linked in: [ 32.735861] Dumping ftrace buffer: [ 32.739380] (ftrace buffer empty) [ 32.743075] CR2: ffffebe000000008 [ 32.746512] ---[ end trace 67e2571765e1d3a1 ]--- [ 32.751258] RIP: 0010:kfree+0xa0/0x260 [ 32.755130] 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 [ 32.774258] RSP: 0018:ffff8801acb8f520 EFLAGS: 00010086 [ 32.779609] RAX: ffffea0000000000 RBX: 0000000000000286 RCX: 0000000000000000 [ 32.786861] RDX: ffffebe000000000 RSI: 0000000000000000 RDI: 0000000000000286 [ 32.794117] RBP: ffff8801acb8f540 R08: ffffed003b5e46d7 R09: ffffed003b5e46d6 [ 32.801377] R10: ffffed003b5e46d6 R11: ffff8801daf236b3 R12: 0000000000000286 [ 32.808632] R13: ffffffff8766d6c3 R14: ffff8801acb8f690 R15: ffff8801ac440380 [ 32.815900] FS: 0000000002282880(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000 [ 32.824117] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 32.829992] CR2: ffffebe000000008 CR3: 00000001d886a000 CR4: 00000000001406e0 [ 32.837253] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 32.844518] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 32.851779] Kernel panic - not syncing: Fatal exception [ 32.857625] Dumping ftrace buffer: [ 32.861147] (ftrace buffer empty) [ 32.864836] Kernel Offset: disabled [ 32.868443] Rebooting in 86400 seconds..