[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 19.413285] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 23.136678] random: sshd: uninitialized urandom read (32 bytes read) [ 23.543581] random: sshd: uninitialized urandom read (32 bytes read) [ 24.404749] random: sshd: uninitialized urandom read (32 bytes read) [ 24.558177] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.45' (ECDSA) to the list of known hosts. [ 30.077593] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 30.169559] BUG: unable to handle kernel paging request at ffffebe000000008 [ 30.176682] PGD 0 P4D 0 [ 30.179338] Oops: 0000 [#1] SMP KASAN [ 30.183118] CPU: 0 PID: 4568 Comm: syz-executor312 Not tainted 4.18.0-rc4+ #141 [ 30.190540] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 30.199879] RIP: 0010:kfree+0xa0/0x260 [ 30.203737] 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 [ 30.222861] RSP: 0018:ffff8801ac4c7520 EFLAGS: 00010086 [ 30.228213] RAX: ffffea0000000000 RBX: 0000000000000286 RCX: 0000000000000000 [ 30.235468] RDX: ffffebe000000000 RSI: 0000000000000000 RDI: 0000000000000286 [ 30.242717] RBP: ffff8801ac4c7540 R08: ffffed003b5c46d7 R09: ffffed003b5c46d6 [ 30.249966] R10: ffffed003b5c46d6 R11: ffff8801dae236b3 R12: 0000000000000286 [ 30.257227] R13: ffffffff8766d6c3 R14: ffff8801ac4c7690 R15: ffff8801ac578380 [ 30.264477] FS: 0000000001130880(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000 [ 30.272677] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 30.278534] CR2: ffffebe000000008 CR3: 00000001d8f25000 CR4: 00000000001406f0 [ 30.285782] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 30.293031] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 30.300275] Call Trace: [ 30.302851] p9_client_create+0xf43/0x16c9 [ 30.307086] ? p9_client_read+0xc60/0xc60 [ 30.311239] ? find_held_lock+0x36/0x1c0 [ 30.315299] ? __lockdep_init_map+0x105/0x590 [ 30.319778] ? kasan_check_write+0x14/0x20 [ 30.323990] ? __init_rwsem+0x1cc/0x2a0 [ 30.327951] ? do_raw_write_unlock.cold.8+0x49/0x49 [ 30.332948] ? rcu_read_lock_sched_held+0x108/0x120 [ 30.337944] ? __kmalloc_track_caller+0x5f5/0x760 [ 30.342766] ? save_stack+0xa9/0xd0 [ 30.346371] ? save_stack+0x43/0xd0 [ 30.349977] ? kasan_kmalloc+0xc4/0xe0 [ 30.353845] ? kmem_cache_alloc_trace+0x152/0x780 [ 30.358675] ? memcpy+0x45/0x50 [ 30.361936] v9fs_session_init+0x21a/0x1a80 [ 30.366238] ? find_held_lock+0x36/0x1c0 [ 30.370279] ? v9fs_show_options+0x7e0/0x7e0 [ 30.374665] ? kasan_check_read+0x11/0x20 [ 30.378788] ? rcu_is_watching+0x8c/0x150 [ 30.382912] ? rcu_pm_notify+0xc0/0xc0 [ 30.386780] ? v9fs_mount+0x61/0x900 [ 30.390470] ? rcu_read_lock_sched_held+0x108/0x120 [ 30.395464] ? kmem_cache_alloc_trace+0x616/0x780 [ 30.400295] ? __sanitizer_cov_trace_const_cmp2+0x18/0x20 [ 30.405808] v9fs_mount+0x7c/0x900 [ 30.409333] mount_fs+0xae/0x328 [ 30.412681] vfs_kern_mount.part.34+0xdc/0x4e0 [ 30.417242] ? may_umount+0xb0/0xb0 [ 30.420848] ? _raw_read_unlock+0x22/0x30 [ 30.424975] ? __get_fs_type+0x97/0xc0 [ 30.428843] do_mount+0x581/0x30e0 [ 30.432372] ? copy_mount_string+0x40/0x40 [ 30.436586] ? copy_mount_options+0x5f/0x380 [ 30.440975] ? rcu_read_lock_sched_held+0x108/0x120 [ 30.445969] ? kmem_cache_alloc_trace+0x616/0x780 [ 30.450800] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 30.456318] ? _copy_from_user+0xdf/0x150 [ 30.460444] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 30.465957] ? copy_mount_options+0x285/0x380 [ 30.470430] ksys_mount+0x12d/0x140 [ 30.474037] __x64_sys_mount+0xbe/0x150 [ 30.477991] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 30.482992] do_syscall_64+0x1b9/0x820 [ 30.486860] ? syscall_slow_exit_work+0x500/0x500 [ 30.491683] ? syscall_return_slowpath+0x5e0/0x5e0 [ 30.496589] ? syscall_return_slowpath+0x31d/0x5e0 [ 30.501499] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 30.507021] ? retint_user+0x18/0x18 [ 30.510724] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 30.515557] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 30.520735] RIP: 0033:0x440149 [ 30.523901] 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 [ 30.543033] RSP: 002b:00007ffc6519c458 EFLAGS: 00000202 ORIG_RAX: 00000000000000a5 [ 30.550731] RAX: ffffffffffffffda RBX: 0030656c69662f2e RCX: 0000000000440149 [ 30.557979] RDX: 0000000020000340 RSI: 00000000200000c0 RDI: 0000000000000000 [ 30.565241] RBP: 00000000006ca018 R08: 00000000200001c0 R09: 00000000004002c8 [ 30.572487] R10: 0000000000000000 R11: 0000000000000202 R12: 00000000004019d0 [ 30.579743] R13: 0000000000401a60 R14: 0000000000000000 R15: 0000000000000000 [ 30.586994] Modules linked in: [ 30.590171] Dumping ftrace buffer: [ 30.593697] (ftrace buffer empty) [ 30.597384] CR2: ffffebe000000008 [ 30.600821] ---[ end trace 7e28655a4a683ec8 ]--- [ 30.605558] RIP: 0010:kfree+0xa0/0x260 [ 30.609415] 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 [ 30.628527] RSP: 0018:ffff8801ac4c7520 EFLAGS: 00010086 [ 30.633869] RAX: ffffea0000000000 RBX: 0000000000000286 RCX: 0000000000000000 [ 30.641118] RDX: ffffebe000000000 RSI: 0000000000000000 RDI: 0000000000000286 [ 30.648365] RBP: ffff8801ac4c7540 R08: ffffed003b5c46d7 R09: ffffed003b5c46d6 [ 30.655612] R10: ffffed003b5c46d6 R11: ffff8801dae236b3 R12: 0000000000000286 [ 30.662866] R13: ffffffff8766d6c3 R14: ffff8801ac4c7690 R15: ffff8801ac578380 [ 30.670113] FS: 0000000001130880(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000 [ 30.678314] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 30.684173] CR2: ffffebe000000008 CR3: 00000001d8f25000 CR4: 00000000001406f0 [ 30.691421] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 30.698669] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 30.705914] Kernel panic - not syncing: Fatal exception [ 30.711738] Dumping ftrace buffer: [ 30.715358] (ftrace buffer empty) [ 30.719046] Kernel Offset: disabled [ 30.722661] Rebooting in 86400 seconds..