[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 17.918614] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 22.680118] random: sshd: uninitialized urandom read (32 bytes read) [ 22.903268] random: sshd: uninitialized urandom read (32 bytes read) [ 23.749674] random: sshd: uninitialized urandom read (32 bytes read) [ 23.911994] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.29' (ECDSA) to the list of known hosts. [ 29.342477] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 29.434733] BUG: unable to handle kernel paging request at ffffebe000000008 [ 29.441867] PGD 0 P4D 0 [ 29.444527] Oops: 0000 [#1] SMP KASAN [ 29.448342] CPU: 1 PID: 4512 Comm: syz-executor551 Not tainted 4.18.0-rc3+ #137 [ 29.455776] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 29.465132] RIP: 0010:kfree+0xa0/0x260 [ 29.468993] 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 [ 29.488130] RSP: 0018:ffff8801c9d0f520 EFLAGS: 00010086 [ 29.493471] RAX: ffffea0000000000 RBX: 0000000000000286 RCX: 0000000000000000 [ 29.500731] RDX: ffffebe000000000 RSI: 0000000000000000 RDI: 0000000000000286 [ 29.507977] RBP: ffff8801c9d0f540 R08: ffffed003b5e46d7 R09: ffffed003b5e46d6 [ 29.515230] R10: ffffed003b5e46d6 R11: ffff8801daf236b3 R12: 0000000000000286 [ 29.522487] R13: ffffffff8766d6c3 R14: ffff8801c9d0f690 R15: ffff8801af230380 [ 29.529739] FS: 00000000012d0880(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000 [ 29.537943] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 29.543801] CR2: ffffebe000000008 CR3: 00000001aff92000 CR4: 00000000001406e0 [ 29.551066] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 29.558317] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 29.565565] Call Trace: [ 29.568138] p9_client_create+0xf43/0x16c9 [ 29.572353] ? p9_client_read+0xc60/0xc60 [ 29.576495] ? find_held_lock+0x36/0x1c0 [ 29.580544] ? __lockdep_init_map+0x105/0x590 [ 29.585030] ? kasan_check_write+0x14/0x20 [ 29.589246] ? __init_rwsem+0x1cc/0x2a0 [ 29.593208] ? do_raw_write_unlock.cold.8+0x49/0x49 [ 29.598205] ? rcu_read_lock_sched_held+0x108/0x120 [ 29.603202] ? __kmalloc_track_caller+0x5f5/0x760 [ 29.608032] ? save_stack+0xa9/0xd0 [ 29.611640] ? save_stack+0x43/0xd0 [ 29.615244] ? kasan_kmalloc+0xc4/0xe0 [ 29.619113] ? kmem_cache_alloc_trace+0x152/0x780 [ 29.623933] ? memcpy+0x45/0x50 [ 29.627196] v9fs_session_init+0x21a/0x1a80 [ 29.631503] ? find_held_lock+0x36/0x1c0 [ 29.635547] ? v9fs_show_options+0x7e0/0x7e0 [ 29.639938] ? kasan_check_read+0x11/0x20 [ 29.644075] ? rcu_is_watching+0x8c/0x150 [ 29.648206] ? rcu_pm_notify+0xc0/0xc0 [ 29.652081] ? v9fs_mount+0x61/0x900 [ 29.655775] ? rcu_read_lock_sched_held+0x108/0x120 [ 29.660783] ? kmem_cache_alloc_trace+0x616/0x780 [ 29.665610] ? __sanitizer_cov_trace_const_cmp2+0x18/0x20 [ 29.671129] v9fs_mount+0x7c/0x900 [ 29.674652] mount_fs+0xae/0x328 [ 29.678002] vfs_kern_mount.part.34+0xdc/0x4e0 [ 29.682591] ? may_umount+0xb0/0xb0 [ 29.686203] ? _raw_read_unlock+0x22/0x30 [ 29.690332] ? __get_fs_type+0x97/0xc0 [ 29.694210] do_mount+0x581/0x30e0 [ 29.697742] ? copy_mount_string+0x40/0x40 [ 29.701962] ? copy_mount_options+0x5f/0x380 [ 29.706362] ? rcu_read_lock_sched_held+0x108/0x120 [ 29.711357] ? kmem_cache_alloc_trace+0x616/0x780 [ 29.716191] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 29.721717] ? _copy_from_user+0xdf/0x150 [ 29.725859] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 29.731376] ? copy_mount_options+0x285/0x380 [ 29.735859] ksys_mount+0x12d/0x140 [ 29.739481] __x64_sys_mount+0xbe/0x150 [ 29.743435] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 29.748432] do_syscall_64+0x1b9/0x820 [ 29.752302] ? syscall_return_slowpath+0x5e0/0x5e0 [ 29.757223] ? syscall_return_slowpath+0x31d/0x5e0 [ 29.762134] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 29.767665] ? retint_user+0x18/0x18 [ 29.771360] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 29.776195] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 29.781382] RIP: 0033:0x4401d9 [ 29.784561] 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 [ 29.803681] RSP: 002b:00007ffe6e8d4698 EFLAGS: 00000202 ORIG_RAX: 00000000000000a5 [ 29.811371] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 00000000004401d9 [ 29.818621] RDX: 00000000200002c0 RSI: 00000000200001c0 RDI: 0000000000000000 [ 29.825872] RBP: 00000000006ca018 R08: 00000000200003c0 R09: 00000000004002c8 [ 29.833121] R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000401a60 [ 29.840378] R13: 0000000000401af0 R14: 0000000000000000 R15: 0000000000000000 [ 29.847630] Modules linked in: [ 29.850809] Dumping ftrace buffer: [ 29.854324] (ftrace buffer empty) [ 29.858014] CR2: ffffebe000000008 [ 29.861470] ---[ end trace a145a38935e2c7cf ]--- [ 29.866222] RIP: 0010:kfree+0xa0/0x260 [ 29.870081] 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 [ 29.889207] RSP: 0018:ffff8801c9d0f520 EFLAGS: 00010086 [ 29.894552] RAX: ffffea0000000000 RBX: 0000000000000286 RCX: 0000000000000000 [ 29.901825] RDX: ffffebe000000000 RSI: 0000000000000000 RDI: 0000000000000286 [ 29.909083] RBP: ffff8801c9d0f540 R08: ffffed003b5e46d7 R09: ffffed003b5e46d6 [ 29.916344] R10: ffffed003b5e46d6 R11: ffff8801daf236b3 R12: 0000000000000286 [ 29.923604] R13: ffffffff8766d6c3 R14: ffff8801c9d0f690 R15: ffff8801af230380 [ 29.930863] FS: 00000000012d0880(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000 [ 29.939069] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 29.944942] CR2: ffffebe000000008 CR3: 00000001aff92000 CR4: 00000000001406e0 [ 29.952201] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 29.959459] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 29.966710] Kernel panic - not syncing: Fatal exception [ 29.972637] Dumping ftrace buffer: [ 29.976165] (ftrace buffer empty) [ 29.979852] Kernel Offset: disabled [ 29.983457] Rebooting in 86400 seconds..