EXT4-fs (loop4): VFS: Can't find ext4 filesystem list_del corruption. prev->next should be ffff8801cf76bec8, but was ffff880196cef3b0 ------------[ cut here ]------------ kernel BUG at lib/list_debug.c:53! invalid opcode: 0000 [#1] SMP KASAN CPU: 1 PID: 32127 Comm: syz-executor4 Not tainted 4.18.0-rc5-next-20180719+ #11 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:__list_del_entry_valid.cold.1+0x48/0x58 lib/list_debug.c:51 Code: 8e 1a 88 e8 56 fc fe fd 0f 0b 48 89 de 48 c7 c7 c0 8f 1a 88 e8 45 fc fe fd 0f 0b 48 89 de 48 c7 c7 60 8f 1a 88 e8 34 fc fe fd <0f> 0b 90 90 90 90 90 90 90 90 90 90 90 90 90 90 55 48 89 e5 41 57 RSP: 0018:ffff8801abe5f2b8 EFLAGS: 00010282 RAX: 0000000000000054 RBX: ffff8801cf76bec8 RCX: ffffc90004819000 RDX: 0000000000000000 RSI: ffffffff81637611 RDI: 0000000000000001 RBP: ffff8801abe5f2d0 R08: ffff88019525c1c0 R09: ffffed003b5e4fd0 R10: ffffed003b5e4fd0 R11: ffff8801daf27e87 R12: ffff880196cef3b0 R13: ffff880196cef3b0 R14: ffff8801cf76bec8 R15: ffff8801cf76bed0 FS: 00007f169a4fe700(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fa0dae57000 CR3: 00000001cb164000 CR4: 00000000001406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __list_del_entry include/linux/list.h:117 [inline] list_del include/linux/list.h:125 [inline] p9_fd_cancel+0x104/0x360 net/9p/trans_fd.c:690 p9_client_rpc+0xe70/0x1330 net/9p/client.c:718 p9_client_version net/9p/client.c:890 [inline] p9_client_create+0xca4/0x1537 net/9p/client.c:974 v9fs_session_init+0x21a/0x1a80 fs/9p/v9fs.c:400 v9fs_mount+0x7c/0x900 fs/9p/vfs_super.c:135 legacy_get_tree+0x131/0x460 fs/fs_context.c:674 vfs_get_tree+0x1cb/0x5c0 fs/super.c:1743 do_new_mount fs/namespace.c:2603 [inline] do_mount+0x6f2/0x1e20 fs/namespace.c:2927 ksys_mount+0x12d/0x140 fs/namespace.c:3143 __do_sys_mount fs/namespace.c:3157 [inline] __se_sys_mount fs/namespace.c:3154 [inline] __x64_sys_mount+0xbe/0x150 fs/namespace.c:3154 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x455ab9 Code: 1d ba fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 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 eb b9 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f169a4fdc68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007f169a4fe6d4 RCX: 0000000000455ab9 RDX: 0000000020000040 RSI: 0000000020000000 RDI: 0000000000000000 RBP: 000000000072bff0 R08: 0000000020000080 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000004c0201 R14: 00000000004cfe50 R15: 0000000000000002 Modules linked in: Dumping ftrace buffer: --------------------------------- syz-exec-21996 1...3 371369272us : 0: }D syz-exec-22001 1...3 371372824us : 0: }D syz-exec-22001 1...3 371372844us : 0: }D --------------------------------- ---[ end trace 0844ee0db71a8b86 ]--- RIP: 0010:__list_del_entry_valid.cold.1+0x48/0x58 lib/list_debug.c:51 Code: 8e 1a 88 e8 56 fc fe fd 0f 0b 48 89 de 48 c7 c7 c0 8f 1a 88 e8 45 fc fe fd 0f 0b 48 89 de 48 c7 c7 60 8f 1a 88 e8 34 fc fe fd <0f> 0b 90 90 90 90 90 90 90 90 90 90 90 90 90 90 55 48 89 e5 41 57 RSP: 0018:ffff8801abe5f2b8 EFLAGS: 00010282 RAX: 0000000000000054 RBX: ffff8801cf76bec8 RCX: ffffc90004819000 RDX: 0000000000000000 RSI: ffffffff81637611 RDI: 0000000000000001 RBP: ffff8801abe5f2d0 R08: ffff88019525c1c0 R09: ffffed003b5e4fd0 R10: ffffed003b5e4fd0 R11: ffff8801daf27e87 R12: ffff880196cef3b0 R13: ffff880196cef3b0 R14: ffff8801cf76bec8 R15: ffff8801cf76bed0 FS: 00007f169a4fe700(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fa0dae57000 CR3: 00000001cb164000 CR4: 00000000001406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400