[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 18.470666] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 24.147695] random: sshd: uninitialized urandom read (32 bytes read) [ 24.559255] random: sshd: uninitialized urandom read (32 bytes read) [ 25.393614] random: sshd: uninitialized urandom read (32 bytes read) [ 25.545477] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.38' (ECDSA) to the list of known hosts. [ 31.040577] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 31.128606] BUG: unable to handle kernel paging request at ffffebe000000008 [ 31.135716] PGD 0 P4D 0 [ 31.138370] Oops: 0000 [#1] SMP KASAN [ 31.142144] CPU: 1 PID: 4521 Comm: syz-executor796 Not tainted 4.18.0-rc4+ #147 [ 31.149564] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 31.158902] RIP: 0010:kfree+0xa0/0x260 [ 31.162760] 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 [ 31.181868] RSP: 0018:ffff8801d926f520 EFLAGS: 00010086 [ 31.187206] RAX: ffffea0000000000 RBX: 0000000000000286 RCX: 0000000000000000 [ 31.194638] RDX: ffffebe000000000 RSI: 0000000000000000 RDI: 0000000000000286 [ 31.201886] RBP: ffff8801d926f540 R08: ffffed003b5e46d7 R09: ffffed003b5e46d6 [ 31.209132] R10: ffffed003b5e46d6 R11: ffff8801daf236b3 R12: 0000000000000286 [ 31.216377] R13: ffffffff8766e76a R14: ffff8801d926f690 R15: ffff8801abb68340 [ 31.223627] FS: 0000000001df2880(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000 [ 31.231828] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 31.237686] CR2: ffffebe000000008 CR3: 00000001d9644000 CR4: 00000000001406e0 [ 31.244934] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 31.252179] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 31.259420] Call Trace: [ 31.261990] p9_client_create+0xfea/0x1770 [ 31.266202] ? p9_client_read+0xc60/0xc60 [ 31.270328] ? find_held_lock+0x36/0x1c0 [ 31.274370] ? __lockdep_init_map+0x105/0x590 [ 31.278846] ? kasan_check_write+0x14/0x20 [ 31.283063] ? __init_rwsem+0x1cc/0x2a0 [ 31.287026] ? do_raw_write_unlock.cold.8+0x49/0x49 [ 31.292031] ? rcu_read_lock_sched_held+0x108/0x120 [ 31.297028] ? __kmalloc_track_caller+0x5f5/0x760 [ 31.301847] ? save_stack+0xa9/0xd0 [ 31.305451] ? save_stack+0x43/0xd0 [ 31.309052] ? kasan_kmalloc+0xc4/0xe0 [ 31.312919] ? kmem_cache_alloc_trace+0x152/0x780 [ 31.317737] ? memcpy+0x45/0x50 [ 31.320997] v9fs_session_init+0x21a/0x1a80 [ 31.325314] ? find_held_lock+0x36/0x1c0 [ 31.329374] ? v9fs_show_options+0x7e0/0x7e0 [ 31.333780] ? kasan_check_read+0x11/0x20 [ 31.337920] ? rcu_is_watching+0x8c/0x150 [ 31.342058] ? rcu_pm_notify+0xc0/0xc0 [ 31.345940] ? v9fs_mount+0x61/0x900 [ 31.349644] ? rcu_read_lock_sched_held+0x108/0x120 [ 31.354650] ? kmem_cache_alloc_trace+0x616/0x780 [ 31.359486] ? __sanitizer_cov_trace_const_cmp2+0x18/0x20 [ 31.365013] v9fs_mount+0x7c/0x900 [ 31.368536] mount_fs+0xae/0x328 [ 31.371882] vfs_kern_mount.part.34+0xdc/0x4e0 [ 31.376442] ? may_umount+0xb0/0xb0 [ 31.380046] ? _raw_read_unlock+0x22/0x30 [ 31.384171] ? __get_fs_type+0x97/0xc0 [ 31.388037] do_mount+0x581/0x30e0 [ 31.391555] ? copy_mount_string+0x40/0x40 [ 31.395770] ? copy_mount_options+0x5f/0x380 [ 31.400156] ? rcu_read_lock_sched_held+0x108/0x120 [ 31.405149] ? kmem_cache_alloc_trace+0x616/0x780 [ 31.409971] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 31.415487] ? _copy_from_user+0xdf/0x150 [ 31.419616] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 31.425130] ? copy_mount_options+0x285/0x380 [ 31.429604] ksys_mount+0x12d/0x140 [ 31.433212] __x64_sys_mount+0xbe/0x150 [ 31.437166] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 31.442163] do_syscall_64+0x1b9/0x820 [ 31.446026] ? syscall_return_slowpath+0x5e0/0x5e0 [ 31.450933] ? syscall_return_slowpath+0x31d/0x5e0 [ 31.455841] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 31.461355] ? retint_user+0x18/0x18 [ 31.465045] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 31.469868] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 31.475037] RIP: 0033:0x440149 [ 31.478208] 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 [ 31.497318] RSP: 002b:00007ffc65cd93e8 EFLAGS: 00000206 ORIG_RAX: 00000000000000a5 [ 31.505006] RAX: ffffffffffffffda RBX: 0030656c69662f2e RCX: 0000000000440149 [ 31.512252] RDX: 0000000020000340 RSI: 0000000020000480 RDI: 0000000000000000 [ 31.519495] RBP: 00000000006ca018 R08: 0000000020000540 R09: 00000000004002c8 [ 31.526742] R10: 0000000000000000 R11: 0000000000000206 R12: 00000000004019d0 [ 31.533988] R13: 0000000000401a60 R14: 0000000000000000 R15: 0000000000000000 [ 31.541235] Modules linked in: [ 31.544407] Dumping ftrace buffer: [ 31.547919] (ftrace buffer empty) [ 31.551606] CR2: ffffebe000000008 [ 31.555044] ---[ end trace a5b590cfd3b883d7 ]--- [ 31.559785] RIP: 0010:kfree+0xa0/0x260 [ 31.563641] 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 [ 31.582750] RSP: 0018:ffff8801d926f520 EFLAGS: 00010086 [ 31.588088] RAX: ffffea0000000000 RBX: 0000000000000286 RCX: 0000000000000000 [ 31.595336] RDX: ffffebe000000000 RSI: 0000000000000000 RDI: 0000000000000286 [ 31.602581] RBP: ffff8801d926f540 R08: ffffed003b5e46d7 R09: ffffed003b5e46d6 [ 31.609826] R10: ffffed003b5e46d6 R11: ffff8801daf236b3 R12: 0000000000000286 [ 31.617069] R13: ffffffff8766e76a R14: ffff8801d926f690 R15: ffff8801abb68340 [ 31.624317] FS: 0000000001df2880(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000 [ 31.632517] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 31.638373] CR2: ffffebe000000008 CR3: 00000001d9644000 CR4: 00000000001406e0 [ 31.645618] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 31.652863] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 31.660116] Kernel panic - not syncing: Fatal exception [ 31.665877] Dumping ftrace buffer: [ 31.669393] (ftrace buffer empty) [ 31.673075] Kernel Offset: disabled [ 31.676673] Rebooting in 86400 seconds..