[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 18.678276] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 22.651362] random: sshd: uninitialized urandom read (32 bytes read) [ 23.027773] random: sshd: uninitialized urandom read (32 bytes read) [ 23.853377] random: sshd: uninitialized urandom read (32 bytes read) [ 24.005506] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.8' (ECDSA) to the list of known hosts. [ 29.496324] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 29.585435] BUG: unable to handle kernel paging request at ffffebe000000008 [ 29.592566] PGD 0 P4D 0 [ 29.595233] Oops: 0000 [#1] SMP KASAN [ 29.599035] CPU: 1 PID: 4521 Comm: syz-executor606 Not tainted 4.18.0-rc4+ #142 [ 29.606472] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 29.615811] RIP: 0010:kfree+0xa0/0x260 [ 29.619671] 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 [ 29.638799] RSP: 0018:ffff8801d9667520 EFLAGS: 00010086 [ 29.644141] RAX: ffffea0000000000 RBX: 0000000000000286 RCX: 0000000000000000 [ 29.651398] RDX: ffffebe000000000 RSI: 0000000000000000 RDI: 0000000000000286 [ 29.658647] RBP: ffff8801d9667540 R08: ffffed003b5e46d7 R09: ffffed003b5e46d6 [ 29.665989] R10: ffffed003b5e46d6 R11: ffff8801daf236b3 R12: 0000000000000286 [ 29.673332] R13: ffffffff8766d6c3 R14: ffff8801d9667690 R15: ffff8801d9368380 [ 29.680607] FS: 0000000000a18880(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000 [ 29.688811] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 29.694679] CR2: ffffebe000000008 CR3: 00000001d92cf000 CR4: 00000000001406e0 [ 29.701938] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 29.709194] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 29.716450] Call Trace: [ 29.719032] p9_client_create+0xf43/0x16c9 [ 29.723262] ? p9_client_read+0xc60/0xc60 [ 29.727390] ? find_held_lock+0x36/0x1c0 [ 29.731447] ? __lockdep_init_map+0x105/0x590 [ 29.735930] ? kasan_check_write+0x14/0x20 [ 29.740143] ? __init_rwsem+0x1cc/0x2a0 [ 29.744105] ? do_raw_write_unlock.cold.8+0x49/0x49 [ 29.749195] ? rcu_read_lock_sched_held+0x108/0x120 [ 29.754192] ? __kmalloc_track_caller+0x5f5/0x760 [ 29.759017] ? save_stack+0xa9/0xd0 [ 29.762629] ? save_stack+0x43/0xd0 [ 29.766237] ? kasan_kmalloc+0xc4/0xe0 [ 29.770114] ? kmem_cache_alloc_trace+0x152/0x780 [ 29.774944] ? memcpy+0x45/0x50 [ 29.778222] v9fs_session_init+0x21a/0x1a80 [ 29.782536] ? lock_downgrade+0x8f0/0x8f0 [ 29.786663] ? v9fs_show_options+0x7e0/0x7e0 [ 29.791068] ? kasan_check_read+0x11/0x20 [ 29.795205] ? do_raw_spin_unlock+0xa7/0x2f0 [ 29.799598] ? kasan_check_read+0x11/0x20 [ 29.803726] ? rcu_is_watching+0x8c/0x150 [ 29.807863] ? rcu_pm_notify+0xc0/0xc0 [ 29.811732] ? v9fs_mount+0x61/0x900 [ 29.815425] ? rcu_read_lock_sched_held+0x108/0x120 [ 29.820426] ? kmem_cache_alloc_trace+0x616/0x780 [ 29.825601] v9fs_mount+0x7c/0x900 [ 29.829128] mount_fs+0xae/0x328 [ 29.832478] vfs_kern_mount.part.34+0xdc/0x4e0 [ 29.837044] ? may_umount+0xb0/0xb0 [ 29.840658] ? _raw_read_unlock+0x22/0x30 [ 29.844791] ? __get_fs_type+0x97/0xc0 [ 29.848658] do_mount+0x581/0x30e0 [ 29.852190] ? copy_mount_string+0x40/0x40 [ 29.856406] ? copy_mount_options+0x5f/0x380 [ 29.860797] ? rcu_read_lock_sched_held+0x108/0x120 [ 29.865795] ? kmem_cache_alloc_trace+0x616/0x780 [ 29.870622] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 29.876149] ? _copy_from_user+0xdf/0x150 [ 29.880290] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 29.885816] ? copy_mount_options+0x285/0x380 [ 29.890290] ksys_mount+0x12d/0x140 [ 29.893900] __x64_sys_mount+0xbe/0x150 [ 29.897857] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 29.902868] do_syscall_64+0x1b9/0x820 [ 29.906741] ? syscall_return_slowpath+0x5e0/0x5e0 [ 29.911661] ? syscall_return_slowpath+0x31d/0x5e0 [ 29.916576] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 29.922097] ? retint_user+0x18/0x18 [ 29.925795] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 29.930624] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 29.935802] RIP: 0033:0x440149 [ 29.938971] 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 [ 29.958115] RSP: 002b:00007ffd05cfbbc8 EFLAGS: 00000202 ORIG_RAX: 00000000000000a5 [ 29.965815] RAX: ffffffffffffffda RBX: 0030656c69662f2e RCX: 0000000000440149 [ 29.973069] RDX: 0000000020000340 RSI: 00000000200000c0 RDI: 0000000000000000 [ 29.980331] RBP: 00000000006ca018 R08: 00000000200001c0 R09: 00000000004002c8 [ 29.987580] R10: 0000000000000000 R11: 0000000000000202 R12: 00000000004019d0 [ 29.994841] R13: 0000000000401a60 R14: 0000000000000000 R15: 0000000000000000 [ 30.002104] Modules linked in: [ 30.005276] Dumping ftrace buffer: [ 30.008788] (ftrace buffer empty) [ 30.012475] CR2: ffffebe000000008 [ 30.015911] ---[ end trace f485495d01d45c6d ]--- [ 30.020651] RIP: 0010:kfree+0xa0/0x260 [ 30.024511] 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 [ 30.043641] RSP: 0018:ffff8801d9667520 EFLAGS: 00010086 [ 30.048981] RAX: ffffea0000000000 RBX: 0000000000000286 RCX: 0000000000000000 [ 30.056231] RDX: ffffebe000000000 RSI: 0000000000000000 RDI: 0000000000000286 [ 30.063487] RBP: ffff8801d9667540 R08: ffffed003b5e46d7 R09: ffffed003b5e46d6 [ 30.070735] R10: ffffed003b5e46d6 R11: ffff8801daf236b3 R12: 0000000000000286 [ 30.077982] R13: ffffffff8766d6c3 R14: ffff8801d9667690 R15: ffff8801d9368380 [ 30.085231] FS: 0000000000a18880(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000 [ 30.093431] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 30.099291] CR2: ffffebe000000008 CR3: 00000001d92cf000 CR4: 00000000001406e0 [ 30.106539] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 30.113785] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 30.121034] Kernel panic - not syncing: Fatal exception [ 30.126830] Dumping ftrace buffer: [ 30.130360] (ftrace buffer empty) [ 30.134058] Kernel Offset: disabled [ 30.137663] Rebooting in 86400 seconds..