list_del corruption, ffff8801a34334e8->next is LIST_POISON1 (dead000000000100) ------------[ cut here ]------------ kernel BUG at lib/list_debug.c:47! invalid opcode: 0000 [#1] SMP KASAN CPU: 1 PID: 9188 Comm: syz-executor048 Not tainted 4.18.0-rc4+ #42 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:__list_del_entry_valid.cold.1+0x26/0x58 lib/list_debug.c:45 Code: 02 fe 0f 0b 4c 89 e2 48 89 de 48 c7 c7 20 66 1a 88 e8 4a 6e 02 fe 0f 0b 4c 89 ea 48 89 de 48 c7 c7 c0 65 1a 88 e8 36 6e 02 fe <0f> 0b 48 89 de 48 c7 c7 e0 66 1a 88 e8 25 6e 02 fe 0f 0b 48 89 de RSP: 0018:ffff8801a35ef180 EFLAGS: 00010286 RAX: 000000000000004e RBX: ffff8801a34334e8 RCX: 0000000000000000 RDX: 0000000000000000 RSI: ffffffff81631821 RDI: 0000000000000001 RBP: ffff8801a35ef198 R08: ffff8801ca22c640 R09: ffffed003b5e4fc0 R10: ffffed003b5e4fc0 R11: ffff8801daf27e07 R12: ffff8801d943f3b0 R13: dead000000000100 R14: ffff8801a34334e8 R15: ffff8801a34334f0 FS: 0000000000000000(0000) GS:ffff8801daf00000(0063) knlGS:00000000f7fd1b40 CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 CR2: 0000000020000000 CR3: 00000001bb3c4000 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+0xf1f/0x1400 net/9p/client.c:800 p9_client_version net/9p/client.c:976 [inline] p9_client_create+0xd09/0x16c9 net/9p/client.c:1069 v9fs_session_init+0x21a/0x1a80 fs/9p/v9fs.c:400 v9fs_mount+0x7c/0x900 fs/9p/vfs_super.c:135 mount_fs+0xae/0x328 fs/super.c:1277 vfs_kern_mount.part.34+0xdc/0x4e0 fs/namespace.c:1037 vfs_kern_mount fs/namespace.c:1027 [inline] do_new_mount fs/namespace.c:2518 [inline] do_mount+0x581/0x30e0 fs/namespace.c:2848 __do_compat_sys_mount fs/compat.c:125 [inline] __se_compat_sys_mount fs/compat.c:92 [inline] __ia32_compat_sys_mount+0x5d5/0x860 fs/compat.c:92 do_syscall_32_irqs_on arch/x86/entry/common.c:326 [inline] do_fast_syscall_32+0x34d/0xfb2 arch/x86/entry/common.c:397 entry_SYSENTER_compat+0x70/0x7f arch/x86/entry/entry_64_compat.S:139 RIP: 0023:0xf7fd5cb9 Code: 55 08 8b 88 64 cd ff ff 8b 98 68 cd ff ff 89 c8 85 d2 74 02 89 0a 5b 5d c3 8b 04 24 c3 8b 1c 24 c3 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 eb 0d 90 90 90 90 90 90 90 90 90 90 90 90 RSP: 002b:00000000f7fd11dc EFLAGS: 00000286 ORIG_RAX: 0000000000000015 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000020000100 RDX: 00000000200001c0 RSI: 0000000000000000 RDI: 0000000020000200 RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 Modules linked in: Dumping ftrace buffer: (ftrace buffer empty) ---[ end trace bd095a9fa0a6a122 ]--- RIP: 0010:__list_del_entry_valid.cold.1+0x26/0x58 lib/list_debug.c:45 Code: 02 fe 0f 0b 4c 89 e2 48 89 de 48 c7 c7 20 66 1a 88 e8 4a 6e 02 fe 0f 0b 4c 89 ea 48 89 de 48 c7 c7 c0 65 1a 88 e8 36 6e 02 fe <0f> 0b 48 89 de 48 c7 c7 e0 66 1a 88 e8 25 6e 02 fe 0f 0b 48 89 de RSP: 0018:ffff8801a35ef180 EFLAGS: 00010286 RAX: 000000000000004e RBX: ffff8801a34334e8 RCX: 0000000000000000 RDX: 0000000000000000 RSI: ffffffff81631821 RDI: 0000000000000001 RBP: ffff8801a35ef198 R08: ffff8801ca22c640 R09: ffffed003b5e4fc0 R10: ffffed003b5e4fc0 R11: ffff8801daf27e07 R12: ffff8801d943f3b0 R13: dead000000000100 R14: ffff8801a34334e8 R15: ffff8801a34334f0 FS: 0000000000000000(0000) GS:ffff8801daf00000(0063) knlGS:00000000f7fd1b40 CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 CR2: 0000000020000000 CR3: 00000001bb3c4000 CR4: 00000000001406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400