[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 18.136734] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 20.418194] random: sshd: uninitialized urandom read (32 bytes read) [ 20.749387] random: sshd: uninitialized urandom read (32 bytes read) [ 21.608947] random: sshd: uninitialized urandom read (32 bytes read) [ 21.766845] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.3' (ECDSA) to the list of known hosts. [ 27.326863] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 27.431752] BUG: unable to handle kernel paging request at ffffebe000000008 [ 27.438879] PGD 0 P4D 0 [ 27.441541] Oops: 0000 [#1] SMP KASAN [ 27.445318] CPU: 1 PID: 4525 Comm: syz-executor174 Not tainted 4.18.0-rc4+ #147 [ 27.452737] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 27.462089] RIP: 0010:kfree+0xa0/0x260 [ 27.465949] 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 [ 27.485095] RSP: 0018:ffff8801b288f520 EFLAGS: 00010086 [ 27.490452] RAX: ffffea0000000000 RBX: 0000000000000286 RCX: 0000000000000000 [ 27.497701] RDX: ffffebe000000000 RSI: 0000000000000000 RDI: 0000000000000286 [ 27.504949] RBP: ffff8801b288f540 R08: ffffed003b5e46d7 R09: ffffed003b5e46d6 [ 27.512197] R10: ffffed003b5e46d6 R11: ffff8801daf236b3 R12: 0000000000000286 [ 27.519445] R13: ffffffff8766e76a R14: ffff8801b288f690 R15: ffff8801acbe0340 [ 27.526699] FS: 0000000000933880(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000 [ 27.534910] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 27.540771] CR2: ffffebe000000008 CR3: 00000001acad0000 CR4: 00000000001406e0 [ 27.548039] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 27.555289] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 27.562545] Call Trace: [ 27.565132] p9_client_create+0xfea/0x1770 [ 27.569359] ? p9_client_read+0xc60/0xc60 [ 27.573498] ? find_held_lock+0x36/0x1c0 [ 27.577543] ? __lockdep_init_map+0x105/0x590 [ 27.582029] ? kasan_check_write+0x14/0x20 [ 27.586246] ? __init_rwsem+0x1cc/0x2a0 [ 27.590199] ? do_raw_write_unlock.cold.8+0x49/0x49 [ 27.595196] ? rcu_read_lock_sched_held+0x108/0x120 [ 27.600191] ? __kmalloc_track_caller+0x5f5/0x760 [ 27.605016] ? save_stack+0xa9/0xd0 [ 27.608632] ? save_stack+0x43/0xd0 [ 27.612238] ? kasan_kmalloc+0xc4/0xe0 [ 27.616104] ? kmem_cache_alloc_trace+0x152/0x780 [ 27.620925] ? memcpy+0x45/0x50 [ 27.624195] v9fs_session_init+0x21a/0x1a80 [ 27.628505] ? find_held_lock+0x36/0x1c0 [ 27.632565] ? v9fs_show_options+0x7e0/0x7e0 [ 27.636954] ? kasan_check_read+0x11/0x20 [ 27.641079] ? rcu_is_watching+0x8c/0x150 [ 27.645203] ? do_raw_spin_unlock+0xa7/0x2f0 [ 27.649595] ? rcu_pm_notify+0xc0/0xc0 [ 27.653465] ? v9fs_mount+0x61/0x900 [ 27.657159] ? rcu_read_lock_sched_held+0x108/0x120 [ 27.662152] ? kmem_cache_alloc_trace+0x616/0x780 [ 27.666973] v9fs_mount+0x7c/0x900 [ 27.670494] mount_fs+0xae/0x328 [ 27.673840] vfs_kern_mount.part.34+0xdc/0x4e0 [ 27.678401] ? may_umount+0xb0/0xb0 [ 27.682008] ? _raw_read_unlock+0x22/0x30 [ 27.686143] ? __get_fs_type+0x97/0xc0 [ 27.690014] do_mount+0x581/0x30e0 [ 27.693542] ? copy_mount_string+0x40/0x40 [ 27.697756] ? copy_mount_options+0x5f/0x380 [ 27.702143] ? rcu_read_lock_sched_held+0x108/0x120 [ 27.707137] ? kmem_cache_alloc_trace+0x616/0x780 [ 27.711959] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 27.717475] ? _copy_from_user+0xdf/0x150 [ 27.721609] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 27.727128] ? copy_mount_options+0x285/0x380 [ 27.731609] ksys_mount+0x12d/0x140 [ 27.735216] __x64_sys_mount+0xbe/0x150 [ 27.739185] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 27.744182] do_syscall_64+0x1b9/0x820 [ 27.748050] ? syscall_return_slowpath+0x5e0/0x5e0 [ 27.752958] ? syscall_return_slowpath+0x31d/0x5e0 [ 27.757867] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 27.763385] ? retint_user+0x18/0x18 [ 27.767078] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 27.771905] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 27.777079] RIP: 0033:0x440159 [ 27.780248] 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 [ 27.799367] RSP: 002b:00007fffcfbc0668 EFLAGS: 00000202 ORIG_RAX: 00000000000000a5 [ 27.807061] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440159 [ 27.814318] RDX: 0000000020000340 RSI: 00000000200000c0 RDI: 0000000000000000 [ 27.821566] RBP: 00000000006ca018 R08: 00000000200001c0 R09: 00000000004002c8 [ 27.828813] R10: 0000000000000000 R11: 0000000000000202 R12: 00000000004019e0 [ 27.836059] R13: 0000000000401a70 R14: 0000000000000000 R15: 0000000000000000 [ 27.843315] Modules linked in: [ 27.846492] Dumping ftrace buffer: [ 27.850005] (ftrace buffer empty) [ 27.853702] CR2: ffffebe000000008 [ 27.857147] ---[ end trace c3aa93ba980cb622 ]--- [ 27.861889] RIP: 0010:kfree+0xa0/0x260 [ 27.865757] 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 [ 27.884887] RSP: 0018:ffff8801b288f520 EFLAGS: 00010086 [ 27.890229] RAX: ffffea0000000000 RBX: 0000000000000286 RCX: 0000000000000000 [ 27.897479] RDX: ffffebe000000000 RSI: 0000000000000000 RDI: 0000000000000286 [ 27.904726] RBP: ffff8801b288f540 R08: ffffed003b5e46d7 R09: ffffed003b5e46d6 [ 27.911973] R10: ffffed003b5e46d6 R11: ffff8801daf236b3 R12: 0000000000000286 [ 27.919220] R13: ffffffff8766e76a R14: ffff8801b288f690 R15: ffff8801acbe0340 [ 27.926475] FS: 0000000000933880(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000 [ 27.934678] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 27.940536] CR2: ffffebe000000008 CR3: 00000001acad0000 CR4: 00000000001406e0 [ 27.947784] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 27.955036] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 27.962284] Kernel panic - not syncing: Fatal exception [ 27.968081] Dumping ftrace buffer: [ 27.971604] (ftrace buffer empty) [ 27.975290] Kernel Offset: disabled [ 27.978895] Rebooting in 86400 seconds..