[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 17.537797] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. [ 18.301668] random: sshd: uninitialized urandom read (32 bytes read) [ 18.565100] random: sshd: uninitialized urandom read (32 bytes read) Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 19.435563] random: sshd: uninitialized urandom read (32 bytes read) [ 19.596327] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.62' (ECDSA) to the list of known hosts. [ 25.064897] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 25.157589] BUG: unable to handle kernel paging request at ffffebe000000008 [ 25.164726] PGD 0 P4D 0 [ 25.167395] Oops: 0000 [#1] SMP KASAN [ 25.171176] CPU: 0 PID: 4500 Comm: syz-executor070 Not tainted 4.18.0-rc4+ #139 [ 25.178609] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 25.187953] RIP: 0010:kfree+0xa0/0x260 [ 25.191813] 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 [ 25.210930] RSP: 0018:ffff8801b0ec7520 EFLAGS: 00010086 [ 25.216273] RAX: ffffea0000000000 RBX: 0000000000000286 RCX: 0000000000000000 [ 25.223524] RDX: ffffebe000000000 RSI: 0000000000000000 RDI: 0000000000000286 [ 25.230789] RBP: ffff8801b0ec7540 R08: ffffed003b5c46d7 R09: ffffed003b5c46d6 [ 25.238039] R10: ffffed003b5c46d6 R11: ffff8801dae236b3 R12: 0000000000000286 [ 25.245288] R13: ffffffff8766d6c3 R14: ffff8801b0ec7690 R15: ffff8801b1748380 [ 25.252540] FS: 0000000001abb880(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000 [ 25.260743] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 25.266600] CR2: ffffebe000000008 CR3: 00000001b0ebc000 CR4: 00000000001406f0 [ 25.273848] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 25.281097] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 25.288353] Call Trace: [ 25.290927] p9_client_create+0xf43/0x16c9 [ 25.295153] ? p9_client_read+0xc60/0xc60 [ 25.299283] ? find_held_lock+0x36/0x1c0 [ 25.303327] ? __lockdep_init_map+0x105/0x590 [ 25.307805] ? kasan_check_write+0x14/0x20 [ 25.312036] ? __init_rwsem+0x1cc/0x2a0 [ 25.315990] ? do_raw_write_unlock.cold.8+0x49/0x49 [ 25.320989] ? rcu_read_lock_sched_held+0x108/0x120 [ 25.326075] ? __kmalloc_track_caller+0x5f5/0x760 [ 25.330905] ? save_stack+0xa9/0xd0 [ 25.334513] ? save_stack+0x43/0xd0 [ 25.338128] ? kasan_kmalloc+0xc4/0xe0 [ 25.341993] ? kmem_cache_alloc_trace+0x152/0x780 [ 25.346818] ? memcpy+0x45/0x50 [ 25.350112] v9fs_session_init+0x21a/0x1a80 [ 25.354418] ? find_held_lock+0x36/0x1c0 [ 25.358460] ? v9fs_show_options+0x7e0/0x7e0 [ 25.362851] ? kasan_check_read+0x11/0x20 [ 25.366988] ? rcu_is_watching+0x8c/0x150 [ 25.371118] ? rcu_pm_notify+0xc0/0xc0 [ 25.374986] ? v9fs_mount+0x61/0x900 [ 25.378683] ? rcu_read_lock_sched_held+0x108/0x120 [ 25.383688] ? kmem_cache_alloc_trace+0x616/0x780 [ 25.388516] ? __sanitizer_cov_trace_const_cmp2+0x18/0x20 [ 25.394043] v9fs_mount+0x7c/0x900 [ 25.397576] mount_fs+0xae/0x328 [ 25.400922] vfs_kern_mount.part.34+0xdc/0x4e0 [ 25.405484] ? may_umount+0xb0/0xb0 [ 25.409099] ? _raw_read_unlock+0x22/0x30 [ 25.413234] ? __get_fs_type+0x97/0xc0 [ 25.417102] do_mount+0x581/0x30e0 [ 25.420632] ? copy_mount_string+0x40/0x40 [ 25.424859] ? copy_mount_options+0x5f/0x380 [ 25.429250] ? rcu_read_lock_sched_held+0x108/0x120 [ 25.434247] ? kmem_cache_alloc_trace+0x616/0x780 [ 25.439074] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 25.444590] ? _copy_from_user+0xdf/0x150 [ 25.448719] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 25.454236] ? copy_mount_options+0x285/0x380 [ 25.458711] ksys_mount+0x12d/0x140 [ 25.462318] __x64_sys_mount+0xbe/0x150 [ 25.466275] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 25.471275] do_syscall_64+0x1b9/0x820 [ 25.475144] ? syscall_return_slowpath+0x5e0/0x5e0 [ 25.480073] ? syscall_return_slowpath+0x31d/0x5e0 [ 25.484992] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 25.490515] ? retint_user+0x18/0x18 [ 25.494210] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 25.499040] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 25.504210] RIP: 0033:0x440149 [ 25.507375] 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 [ 25.526525] RSP: 002b:00007ffeed402e88 EFLAGS: 00000206 ORIG_RAX: 00000000000000a5 [ 25.534214] RAX: ffffffffffffffda RBX: 0030656c69662f2e RCX: 0000000000440149 [ 25.541463] RDX: 0000000020000340 RSI: 00000000200000c0 RDI: 0000000000000000 [ 25.548711] RBP: 00000000006ca018 R08: 00000000200001c0 R09: 00000000004002c8 [ 25.555957] R10: 0000000000000000 R11: 0000000000000206 R12: 00000000004019d0 [ 25.563202] R13: 0000000000401a60 R14: 0000000000000000 R15: 0000000000000000 [ 25.570452] Modules linked in: [ 25.573626] Dumping ftrace buffer: [ 25.577139] (ftrace buffer empty) [ 25.580825] CR2: ffffebe000000008 [ 25.584261] ---[ end trace 9f0a3f36a0faefaf ]--- [ 25.589003] RIP: 0010:kfree+0xa0/0x260 [ 25.592870] 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 [ 25.612009] RSP: 0018:ffff8801b0ec7520 EFLAGS: 00010086 [ 25.617360] RAX: ffffea0000000000 RBX: 0000000000000286 RCX: 0000000000000000 [ 25.624606] RDX: ffffebe000000000 RSI: 0000000000000000 RDI: 0000000000000286 [ 25.631854] RBP: ffff8801b0ec7540 R08: ffffed003b5c46d7 R09: ffffed003b5c46d6 [ 25.639101] R10: ffffed003b5c46d6 R11: ffff8801dae236b3 R12: 0000000000000286 [ 25.646347] R13: ffffffff8766d6c3 R14: ffff8801b0ec7690 R15: ffff8801b1748380 [ 25.653605] FS: 0000000001abb880(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000 [ 25.661807] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 25.667663] CR2: ffffebe000000008 CR3: 00000001b0ebc000 CR4: 00000000001406f0 [ 25.674912] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 25.682160] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 25.689407] Kernel panic - not syncing: Fatal exception [ 25.695243] Dumping ftrace buffer: [ 25.698762] (ftrace buffer empty) [ 25.702448] Kernel Offset: disabled [ 25.706072] Rebooting in 86400 seconds..