list_del corruption, ffff8881e4c66080->next is LIST_POISON1 (dead000000000100) ------------[ cut here ]------------ kernel BUG at lib/list_debug.c:47! invalid opcode: 0000 [#1] PREEMPT SMP KASAN CPU: 0 PID: 14602 Comm: syz-executor.0 Not tainted 5.4.101-syzkaller-00002-ga8baa288543d #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:__list_del_entry_valid+0xbb/0x100 lib/list_debug.c:45 Code: 89 df e8 08 f1 68 ff 48 8b 13 4c 39 f2 75 43 b0 01 5b 41 5c 41 5e 41 5f c3 48 c7 c7 e0 38 03 85 4c 89 f6 31 c0 e8 c1 6c 23 ff <0f> 0b 48 c7 c7 40 39 03 85 4c 89 f6 31 c0 e8 ae 6c 23 ff 0f 0b 48 RSP: 0018:ffff8881cc41f4b8 EFLAGS: 00010246 RAX: 000000000000004e RBX: dead000000000100 RCX: aeae538a17370000 RDX: ffffc9000062a000 RSI: 000000000001a98b RDI: 000000000001a98c RBP: 0000000000000005 R08: ffffffff814e6247 R09: ffffed103edc5e08 R10: ffffed103edc5e08 R11: 0000000000000000 R12: dffffc0000000000 R13: ffff8881e4c66000 R14: ffff8881e4c66080 R15: dead000000000122 FS: 00007f5101045700(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000511170 CR3: 00000001ef27f000 CR4: 00000000001426f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __list_del_entry include/linux/list.h:131 [inline] list_del include/linux/list.h:139 [inline] p9_fd_cancelled+0x71/0x1b0 net/9p/trans_fd.c:722 p9_client_flush+0x374/0x560 net/9p/client.c:675 p9_client_rpc+0x837/0xab0 net/9p/client.c:782 p9_client_version+0x179/0x710 net/9p/client.c:943 p9_client_create+0x8f5/0xbb0 net/9p/client.c:1053 v9fs_session_init+0x208/0x19f0 fs/9p/v9fs.c:406 v9fs_mount+0x72/0x780 fs/9p/vfs_super.c:124 legacy_get_tree+0xde/0x170 fs/fs_context.c:647 vfs_get_tree+0x83/0x260 fs/super.c:1547 do_new_mount fs/namespace.c:2825 [inline] do_mount+0x19d0/0x2670 fs/namespace.c:3145 ksys_mount+0xc2/0xf0 fs/namespace.c:3354 __do_sys_mount fs/namespace.c:3368 [inline] __se_sys_mount fs/namespace.c:3365 [inline] __x64_sys_mount+0xb1/0xc0 fs/namespace.c:3365 do_syscall_64+0xcb/0x150 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x465ef9 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 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f5101045188 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 000000000056bf60 RCX: 0000000000465ef9 RDX: 0000000020000100 RSI: 0000000020000040 RDI: 0000000000000000 RBP: 00000000004bfa34 R08: 0000000020000300 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf60 R13: 00007ffcb4777cef R14: 00007f5101045300 R15: 0000000000022000 Modules linked in: ---[ end trace 6383cf45ec5218ed ]--- RIP: 0010:__list_del_entry_valid+0xbb/0x100 lib/list_debug.c:45 Code: 89 df e8 08 f1 68 ff 48 8b 13 4c 39 f2 75 43 b0 01 5b 41 5c 41 5e 41 5f c3 48 c7 c7 e0 38 03 85 4c 89 f6 31 c0 e8 c1 6c 23 ff <0f> 0b 48 c7 c7 40 39 03 85 4c 89 f6 31 c0 e8 ae 6c 23 ff 0f 0b 48 RSP: 0018:ffff8881cc41f4b8 EFLAGS: 00010246 RAX: 000000000000004e RBX: dead000000000100 RCX: aeae538a17370000 RDX: ffffc9000062a000 RSI: 000000000001a98b RDI: 000000000001a98c RBP: 0000000000000005 R08: ffffffff814e6247 R09: ffffed103edc5e08 R10: ffffed103edc5e08 R11: 0000000000000000 R12: dffffc0000000000 R13: ffff8881e4c66000 R14: ffff8881e4c66080 R15: dead000000000122 FS: 00007f5101045700(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000511170 CR3: 00000001ef27f000 CR4: 00000000001426f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400