list_del corruption, ffff88811cd1f528->next is LIST_POISON1 (dead000000000100) ------------[ cut here ]------------ kernel BUG at lib/list_debug.c:47! invalid opcode: 0000 [#1] PREEMPT SMP KASAN CPU: 1 PID: 7019 Comm: syz-executor.5 Not tainted 5.10.104-syzkaller-00390-g5c5685cc64b4 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:__list_del_entry_valid+0xc0/0x100 lib/list_debug.c:45 Code: df e8 54 7d 54 ff 48 8b 13 4c 39 f2 75 44 b0 01 5b 41 5c 41 5e 41 5f 5d c3 48 c7 c7 00 bb 49 85 4c 89 f6 31 c0 e8 87 a6 01 ff <0f> 0b 48 c7 c7 60 bb 49 85 4c 89 f6 31 c0 e8 74 a6 01 ff 0f 0b 48 RSP: 0018:ffffc90004207428 EFLAGS: 00010246 RAX: 000000000000004e RBX: dead000000000100 RCX: 4f41583c74229f00 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000 RBP: ffffc90004207448 R08: ffffffff81544c28 R09: ffffed103ee2a5d8 R10: ffffed103ee2a5d8 R11: 0000000000000000 R12: dffffc0000000000 R13: dffffc0000000000 R14: ffff88811cd1f528 R15: dead000000000122 FS: 00007f364afe5700(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fde38089fc8 CR3: 000000016f385000 CR4: 00000000003506a0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __list_del_entry include/linux/list.h:132 [inline] list_del include/linux/list.h:146 [inline] p9_fd_cancelled+0x73/0x1d0 net/9p/trans_fd.c:722 p9_client_flush+0x374/0x560 net/9p/client.c:677 p9_client_rpc+0x837/0xa60 net/9p/client.c:784 p9_client_version+0x179/0x680 net/9p/client.c:945 p9_client_create+0x8f5/0xbb0 net/9p/client.c:1055 v9fs_session_init+0x208/0x1a00 fs/9p/v9fs.c:406 v9fs_mount+0x75/0x7e0 fs/9p/vfs_super.c:126 legacy_get_tree+0xf0/0x190 fs/fs_context.c:592 vfs_get_tree+0x89/0x270 fs/super.c:1549 do_new_mount fs/namespace.c:2899 [inline] path_mount+0x1975/0x2ab0 fs/namespace.c:3229 do_mount fs/namespace.c:3242 [inline] __do_sys_mount fs/namespace.c:3450 [inline] __se_sys_mount+0x2f7/0x3b0 fs/namespace.c:3427 __x64_sys_mount+0xbf/0xd0 fs/namespace.c:3427 do_syscall_64+0x31/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x7f364beb1049 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f364afe5168 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007f364bfc4100 RCX: 00007f364beb1049 RDX: 0000000020000040 RSI: 0000000020000000 RDI: 0000000000000000 RBP: 00007f364bf0b08d R08: 00000000200000c0 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffc6e2f625f R14: 00007f364afe5300 R15: 0000000000022000 Modules linked in: ---[ end trace 17dee370e9187309 ]--- RIP: 0010:__list_del_entry_valid+0xc0/0x100 lib/list_debug.c:45 Code: df e8 54 7d 54 ff 48 8b 13 4c 39 f2 75 44 b0 01 5b 41 5c 41 5e 41 5f 5d c3 48 c7 c7 00 bb 49 85 4c 89 f6 31 c0 e8 87 a6 01 ff <0f> 0b 48 c7 c7 60 bb 49 85 4c 89 f6 31 c0 e8 74 a6 01 ff 0f 0b 48 RSP: 0018:ffffc90004207428 EFLAGS: 00010246 RAX: 000000000000004e RBX: dead000000000100 RCX: 4f41583c74229f00 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000 RBP: ffffc90004207448 R08: ffffffff81544c28 R09: ffffed103ee2a5d8 R10: ffffed103ee2a5d8 R11: 0000000000000000 R12: dffffc0000000000 R13: dffffc0000000000 R14: ffff88811cd1f528 R15: dead000000000122 FS: 00007f364afe5700(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fde38089fc8 CR3: 000000016f385000 CR4: 00000000003506a0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400