[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 20.639292] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 24.971599] random: sshd: uninitialized urandom read (32 bytes read) [ 25.351756] random: sshd: uninitialized urandom read (32 bytes read) [ 26.237336] random: sshd: uninitialized urandom read (32 bytes read) [ 26.408800] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.29' (ECDSA) to the list of known hosts. [ 31.953369] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 32.049391] BUG: unable to handle kernel paging request at ffffebe000000008 [ 32.056530] PGD 0 P4D 0 [ 32.059188] Oops: 0000 [#1] SMP KASAN [ 32.062978] CPU: 0 PID: 4578 Comm: syz-executor644 Not tainted 4.18.0-rc4+ #139 [ 32.070401] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 32.079833] RIP: 0010:kfree+0xa0/0x260 [ 32.083695] 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 [ 32.102819] RSP: 0018:ffff8801d96df520 EFLAGS: 00010086 [ 32.108168] RAX: ffffea0000000000 RBX: 0000000000000286 RCX: 0000000000000000 [ 32.115418] RDX: ffffebe000000000 RSI: 0000000000000000 RDI: 0000000000000286 [ 32.122668] RBP: ffff8801d96df540 R08: ffffed003b5c46d7 R09: ffffed003b5c46d6 [ 32.129918] R10: ffffed003b5c46d6 R11: ffff8801dae236b3 R12: 0000000000000286 [ 32.137170] R13: ffffffff8766d6c3 R14: ffff8801d96df690 R15: ffff8801d9298340 [ 32.144423] FS: 0000000001894880(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000 [ 32.152629] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 32.158578] CR2: ffffebe000000008 CR3: 00000001ad5ae000 CR4: 00000000001406f0 [ 32.165841] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 32.173295] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 32.180560] Call Trace: [ 32.183144] p9_client_create+0xf43/0x16c9 [ 32.187368] ? p9_client_read+0xc60/0xc60 [ 32.191935] ? find_held_lock+0x36/0x1c0 [ 32.195984] ? __lockdep_init_map+0x105/0x590 [ 32.200470] ? kasan_check_write+0x14/0x20 [ 32.204690] ? __init_rwsem+0x1cc/0x2a0 [ 32.208737] ? do_raw_write_unlock.cold.8+0x49/0x49 [ 32.213748] ? rcu_read_lock_sched_held+0x108/0x120 [ 32.218752] ? __kmalloc_track_caller+0x5f5/0x760 [ 32.223597] ? save_stack+0xa9/0xd0 [ 32.227223] ? save_stack+0x43/0xd0 [ 32.230840] ? kasan_kmalloc+0xc4/0xe0 [ 32.234709] ? kmem_cache_alloc_trace+0x152/0x780 [ 32.239538] ? memcpy+0x45/0x50 [ 32.242819] v9fs_session_init+0x21a/0x1a80 [ 32.247135] ? find_held_lock+0x36/0x1c0 [ 32.251190] ? v9fs_show_options+0x7e0/0x7e0 [ 32.255599] ? kasan_check_read+0x11/0x20 [ 32.259732] ? rcu_is_watching+0x8c/0x150 [ 32.263862] ? rcu_pm_notify+0xc0/0xc0 [ 32.267749] ? v9fs_mount+0x61/0x900 [ 32.271460] ? rcu_read_lock_sched_held+0x108/0x120 [ 32.276469] ? kmem_cache_alloc_trace+0x616/0x780 [ 32.281300] ? __sanitizer_cov_trace_const_cmp2+0x18/0x20 [ 32.286839] v9fs_mount+0x7c/0x900 [ 32.290372] mount_fs+0xae/0x328 [ 32.293751] vfs_kern_mount.part.34+0xdc/0x4e0 [ 32.298321] ? may_umount+0xb0/0xb0 [ 32.301934] ? _raw_read_unlock+0x22/0x30 [ 32.306075] ? __get_fs_type+0x97/0xc0 [ 32.309949] do_mount+0x581/0x30e0 [ 32.313826] ? copy_mount_string+0x40/0x40 [ 32.318050] ? copy_mount_options+0x5f/0x380 [ 32.322443] ? rcu_read_lock_sched_held+0x108/0x120 [ 32.327446] ? kmem_cache_alloc_trace+0x616/0x780 [ 32.332277] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 32.337817] ? _copy_from_user+0xdf/0x150 [ 32.341964] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 32.347487] ? copy_mount_options+0x285/0x380 [ 32.351987] ksys_mount+0x12d/0x140 [ 32.355616] __x64_sys_mount+0xbe/0x150 [ 32.359577] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 32.364582] do_syscall_64+0x1b9/0x820 [ 32.368453] ? syscall_return_slowpath+0x5e0/0x5e0 [ 32.373538] ? syscall_return_slowpath+0x31d/0x5e0 [ 32.378466] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 32.383992] ? retint_user+0x18/0x18 [ 32.387713] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 32.392541] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 32.397711] RIP: 0033:0x440179 [ 32.400888] 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 [ 32.420117] RSP: 002b:00007ffc6ba45eb8 EFLAGS: 00000206 ORIG_RAX: 00000000000000a5 [ 32.427814] RAX: ffffffffffffffda RBX: 0030656c69662f2e RCX: 0000000000440179 [ 32.435083] RDX: 0000000020000340 RSI: 00000000200000c0 RDI: 0000000000000000 [ 32.442349] RBP: 00000000006ca018 R08: 00000000200003c0 R09: 00000000004002c8 [ 32.449617] R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000401a00 [ 32.456875] R13: 0000000000401a90 R14: 0000000000000000 R15: 0000000000000000 [ 32.464135] Modules linked in: [ 32.467317] Dumping ftrace buffer: [ 32.470832] (ftrace buffer empty) [ 32.474616] CR2: ffffebe000000008 [ 32.478054] ---[ end trace 2f3c21bd7703ebbc ]--- [ 32.482803] RIP: 0010:kfree+0xa0/0x260 [ 32.486674] 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 [ 32.505799] RSP: 0018:ffff8801d96df520 EFLAGS: 00010086 [ 32.511147] RAX: ffffea0000000000 RBX: 0000000000000286 RCX: 0000000000000000 [ 32.518400] RDX: ffffebe000000000 RSI: 0000000000000000 RDI: 0000000000000286 [ 32.526609] RBP: ffff8801d96df540 R08: ffffed003b5c46d7 R09: ffffed003b5c46d6 [ 32.533863] R10: ffffed003b5c46d6 R11: ffff8801dae236b3 R12: 0000000000000286 [ 32.541123] R13: ffffffff8766d6c3 R14: ffff8801d96df690 R15: ffff8801d9298340 [ 32.548383] FS: 0000000001894880(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000 [ 32.556593] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 32.562459] CR2: ffffebe000000008 CR3: 00000001ad5ae000 CR4: 00000000001406f0 [ 32.569723] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 32.576978] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 32.584232] Kernel panic - not syncing: Fatal exception [ 32.590228] Dumping ftrace buffer: [ 32.593768] (ftrace buffer empty) [ 32.597464] Kernel Offset: disabled [ 32.601085] Rebooting in 86400 seconds..