[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 18.848383] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 23.262800] random: sshd: uninitialized urandom read (32 bytes read) [ 23.560426] random: sshd: uninitialized urandom read (32 bytes read) [ 24.419976] random: sshd: uninitialized urandom read (32 bytes read) [ 24.585622] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.36' (ECDSA) to the list of known hosts. [ 30.002064] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 30.091344] BUG: unable to handle kernel paging request at ffffebe000000008 [ 30.098488] PGD 0 P4D 0 [ 30.101144] Oops: 0000 [#1] SMP KASAN [ 30.104922] CPU: 1 PID: 4520 Comm: syz-executor653 Not tainted 4.18.0-rc4+ #138 [ 30.112343] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 30.121681] RIP: 0010:kfree+0xa0/0x260 [ 30.125541] 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 [ 30.144666] RSP: 0018:ffff8801d9b9f520 EFLAGS: 00010086 [ 30.150014] RAX: ffffea0000000000 RBX: 0000000000000286 RCX: 0000000000000000 [ 30.157267] RDX: ffffebe000000000 RSI: 0000000000000000 RDI: 0000000000000286 [ 30.164514] RBP: ffff8801d9b9f540 R08: ffffed003b5e46d7 R09: ffffed003b5e46d6 [ 30.171762] R10: ffffed003b5e46d6 R11: ffff8801daf236b3 R12: 0000000000000286 [ 30.179013] R13: ffffffff8766d6c3 R14: ffff8801d9b9f690 R15: ffff8801d9128380 [ 30.186271] FS: 00000000016d4880(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000 [ 30.194471] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 30.200330] CR2: ffffebe000000008 CR3: 00000001acaa0000 CR4: 00000000001406e0 [ 30.207578] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 30.214825] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 30.222069] Call Trace: [ 30.224650] p9_client_create+0xf43/0x16c9 [ 30.228868] ? p9_client_read+0xc60/0xc60 [ 30.232996] ? find_held_lock+0x36/0x1c0 [ 30.237049] ? __lockdep_init_map+0x105/0x590 [ 30.241528] ? kasan_check_write+0x14/0x20 [ 30.245742] ? __init_rwsem+0x1cc/0x2a0 [ 30.249696] ? do_raw_write_unlock.cold.8+0x49/0x49 [ 30.254701] ? rcu_read_lock_sched_held+0x108/0x120 [ 30.259706] ? __kmalloc_track_caller+0x5f5/0x760 [ 30.264537] ? save_stack+0xa9/0xd0 [ 30.268141] ? save_stack+0x43/0xd0 [ 30.271746] ? kasan_kmalloc+0xc4/0xe0 [ 30.275612] ? kmem_cache_alloc_trace+0x152/0x780 [ 30.280434] ? memcpy+0x45/0x50 [ 30.283693] v9fs_session_init+0x21a/0x1a80 [ 30.287995] ? find_held_lock+0x36/0x1c0 [ 30.292045] ? v9fs_show_options+0x7e0/0x7e0 [ 30.296436] ? kasan_check_read+0x11/0x20 [ 30.300568] ? rcu_is_watching+0x8c/0x150 [ 30.304694] ? rcu_pm_notify+0xc0/0xc0 [ 30.308564] ? v9fs_mount+0x61/0x900 [ 30.312257] ? rcu_read_lock_sched_held+0x108/0x120 [ 30.317251] ? kmem_cache_alloc_trace+0x616/0x780 [ 30.322073] ? __sanitizer_cov_trace_const_cmp2+0x18/0x20 [ 30.327603] v9fs_mount+0x7c/0x900 [ 30.331136] mount_fs+0xae/0x328 [ 30.334490] vfs_kern_mount.part.34+0xdc/0x4e0 [ 30.339054] ? may_umount+0xb0/0xb0 [ 30.342659] ? _raw_read_unlock+0x22/0x30 [ 30.346786] ? __get_fs_type+0x97/0xc0 [ 30.350655] do_mount+0x581/0x30e0 [ 30.354176] ? copy_mount_string+0x40/0x40 [ 30.358391] ? copy_mount_options+0x5f/0x380 [ 30.362781] ? rcu_read_lock_sched_held+0x108/0x120 [ 30.367776] ? kmem_cache_alloc_trace+0x616/0x780 [ 30.372604] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 30.378123] ? copy_mount_options+0x285/0x380 [ 30.382595] ksys_mount+0x12d/0x140 [ 30.386203] __x64_sys_mount+0xbe/0x150 [ 30.390162] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 30.395159] do_syscall_64+0x1b9/0x820 [ 30.399037] ? syscall_return_slowpath+0x5e0/0x5e0 [ 30.403952] ? syscall_return_slowpath+0x31d/0x5e0 [ 30.408862] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 30.414388] ? retint_user+0x18/0x18 [ 30.418093] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 30.422928] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 30.428109] RIP: 0033:0x440179 [ 30.431273] 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 [ 30.450397] RSP: 002b:00007ffc2dafc1b8 EFLAGS: 00000206 ORIG_RAX: 00000000000000a5 [ 30.458094] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440179 [ 30.465346] RDX: 0000000020000180 RSI: 0000000020000140 RDI: 0000000000000000 [ 30.472605] RBP: 00000000006ca018 R08: 0000000020000200 R09: 00000000004002c8 [ 30.479854] R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000401a00 [ 30.487101] R13: 0000000000401a90 R14: 0000000000000000 R15: 0000000000000000 [ 30.494354] Modules linked in: [ 30.497527] Dumping ftrace buffer: [ 30.501043] (ftrace buffer empty) [ 30.504742] CR2: ffffebe000000008 [ 30.508178] ---[ end trace 3f2606a5eb0dfad6 ]--- [ 30.512918] RIP: 0010:kfree+0xa0/0x260 [ 30.516790] 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 [ 30.535918] RSP: 0018:ffff8801d9b9f520 EFLAGS: 00010086 [ 30.541258] RAX: ffffea0000000000 RBX: 0000000000000286 RCX: 0000000000000000 [ 30.548503] RDX: ffffebe000000000 RSI: 0000000000000000 RDI: 0000000000000286 [ 30.555750] RBP: ffff8801d9b9f540 R08: ffffed003b5e46d7 R09: ffffed003b5e46d6 [ 30.562998] R10: ffffed003b5e46d6 R11: ffff8801daf236b3 R12: 0000000000000286 [ 30.570251] R13: ffffffff8766d6c3 R14: ffff8801d9b9f690 R15: ffff8801d9128380 [ 30.577511] FS: 00000000016d4880(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000 [ 30.585724] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 30.591585] CR2: ffffebe000000008 CR3: 00000001acaa0000 CR4: 00000000001406e0 [ 30.598835] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 30.606082] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 30.613330] Kernel panic - not syncing: Fatal exception [ 30.619097] Dumping ftrace buffer: [ 30.622624] (ftrace buffer empty) [ 30.626307] Kernel Offset: disabled [ 30.629911] Rebooting in 86400 seconds..