[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 17.543457] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 21.062422] random: sshd: uninitialized urandom read (32 bytes read) [ 21.231632] random: sshd: uninitialized urandom read (32 bytes read) [ 22.109785] random: sshd: uninitialized urandom read (32 bytes read) [ 33.530194] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.32' (ECDSA) to the list of known hosts. [ 38.956218] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 39.050706] BUG: unable to handle kernel paging request at ffffebe000000008 [ 39.057860] PGD 0 P4D 0 [ 39.060524] Oops: 0000 [#1] SMP KASAN [ 39.064310] CPU: 0 PID: 4491 Comm: syz-executor014 Not tainted 4.18.0-rc4+ #138 [ 39.071738] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 39.081091] RIP: 0010:kfree+0xa0/0x260 [ 39.084961] 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 [ 39.104208] RSP: 0018:ffff8801b308f520 EFLAGS: 00010086 [ 39.109561] RAX: ffffea0000000000 RBX: 0000000000000286 RCX: 0000000000000000 [ 39.116815] RDX: ffffebe000000000 RSI: 0000000000000000 RDI: 0000000000000286 [ 39.124158] RBP: ffff8801b308f540 R08: ffffed003b5c46d7 R09: ffffed003b5c46d6 [ 39.131431] R10: ffffed003b5c46d6 R11: ffff8801dae236b3 R12: 0000000000000286 [ 39.138680] R13: ffffffff8766d6c3 R14: ffff8801b308f690 R15: ffff8801b3380340 [ 39.145931] FS: 0000000001eb3880(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000 [ 39.154144] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 39.160040] CR2: ffffebe000000008 CR3: 00000001b31b9000 CR4: 00000000001406f0 [ 39.167291] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 39.174542] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 39.181790] Call Trace: [ 39.184381] p9_client_create+0xf43/0x16c9 [ 39.188603] ? p9_client_read+0xc60/0xc60 [ 39.192729] ? find_held_lock+0x36/0x1c0 [ 39.196772] ? __lockdep_init_map+0x105/0x590 [ 39.201260] ? kasan_check_write+0x14/0x20 [ 39.205496] ? __init_rwsem+0x1cc/0x2a0 [ 39.209451] ? do_raw_write_unlock.cold.8+0x49/0x49 [ 39.214452] ? rcu_read_lock_sched_held+0x108/0x120 [ 39.219450] ? __kmalloc_track_caller+0x5f5/0x760 [ 39.224293] ? save_stack+0xa9/0xd0 [ 39.227913] ? save_stack+0x43/0xd0 [ 39.231531] ? kasan_kmalloc+0xc4/0xe0 [ 39.235409] ? kmem_cache_alloc_trace+0x152/0x780 [ 39.240343] ? memcpy+0x45/0x50 [ 39.243606] v9fs_session_init+0x21a/0x1a80 [ 39.247913] ? find_held_lock+0x36/0x1c0 [ 39.251956] ? v9fs_show_options+0x7e0/0x7e0 [ 39.256351] ? kasan_check_read+0x11/0x20 [ 39.260484] ? rcu_is_watching+0x8c/0x150 [ 39.264613] ? rcu_pm_notify+0xc0/0xc0 [ 39.268491] ? v9fs_mount+0x61/0x900 [ 39.272209] ? rcu_read_lock_sched_held+0x108/0x120 [ 39.277213] ? kmem_cache_alloc_trace+0x616/0x780 [ 39.282057] ? __sanitizer_cov_trace_const_cmp2+0x18/0x20 [ 39.287579] v9fs_mount+0x7c/0x900 [ 39.291103] mount_fs+0xae/0x328 [ 39.294639] vfs_kern_mount.part.34+0xdc/0x4e0 [ 39.299202] ? may_umount+0xb0/0xb0 [ 39.302824] ? _raw_read_unlock+0x22/0x30 [ 39.306950] ? __get_fs_type+0x97/0xc0 [ 39.310816] do_mount+0x581/0x30e0 [ 39.314348] ? copy_mount_string+0x40/0x40 [ 39.318565] ? copy_mount_options+0x5f/0x380 [ 39.322953] ? rcu_read_lock_sched_held+0x108/0x120 [ 39.327951] ? kmem_cache_alloc_trace+0x616/0x780 [ 39.332781] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 39.338310] ? _copy_from_user+0xdf/0x150 [ 39.342456] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 39.347978] ? copy_mount_options+0x285/0x380 [ 39.352478] ksys_mount+0x12d/0x140 [ 39.356125] __x64_sys_mount+0xbe/0x150 [ 39.360114] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 39.365140] do_syscall_64+0x1b9/0x820 [ 39.369241] ? syscall_return_slowpath+0x5e0/0x5e0 [ 39.374188] ? syscall_return_slowpath+0x31d/0x5e0 [ 39.379141] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 39.384700] ? retint_user+0x18/0x18 [ 39.388438] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 39.393312] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 39.398486] RIP: 0033:0x440179 [ 39.401652] 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 [ 39.420875] RSP: 002b:00007ffc420ecb58 EFLAGS: 00000202 ORIG_RAX: 00000000000000a5 [ 39.428569] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440179 [ 39.435917] RDX: 0000000020000180 RSI: 0000000020000140 RDI: 0000000000000000 [ 39.443171] RBP: 00000000006ca018 R08: 0000000020000200 R09: 00000000004002c8 [ 39.450429] R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000401a00 [ 39.458137] R13: 0000000000401a90 R14: 0000000000000000 R15: 0000000000000000 [ 39.465403] Modules linked in: [ 39.468584] Dumping ftrace buffer: [ 39.472108] (ftrace buffer empty) [ 39.475808] CR2: ffffebe000000008 [ 39.479248] ---[ end trace 13ff5e11c9ae144c ]--- [ 39.484010] RIP: 0010:kfree+0xa0/0x260 [ 39.487886] 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 [ 39.507025] RSP: 0018:ffff8801b308f520 EFLAGS: 00010086 [ 39.512369] RAX: ffffea0000000000 RBX: 0000000000000286 RCX: 0000000000000000 [ 39.519619] RDX: ffffebe000000000 RSI: 0000000000000000 RDI: 0000000000000286 [ 39.526881] RBP: ffff8801b308f540 R08: ffffed003b5c46d7 R09: ffffed003b5c46d6 [ 39.534132] R10: ffffed003b5c46d6 R11: ffff8801dae236b3 R12: 0000000000000286 [ 39.541393] R13: ffffffff8766d6c3 R14: ffff8801b308f690 R15: ffff8801b3380340 [ 39.548746] FS: 0000000001eb3880(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000 [ 39.556950] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 39.562902] CR2: ffffebe000000008 CR3: 00000001b31b9000 CR4: 00000000001406f0 [ 39.570154] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 39.577406] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 39.584832] Kernel panic - not syncing: Fatal exception [ 39.590710] Dumping ftrace buffer: [ 39.594237] (ftrace buffer empty) [ 39.597947] Kernel Offset: disabled [ 39.601565] Rebooting in 86400 seconds..