Re: [syzbot] [nvme?] BUG: corrupted list in nvmet_fc_remove_port

[syzbot <syzbot+c98b21427617af7f547a@syzkaller.appspotmail.com>]

Hello,

syzbot has tested the proposed patch but the reproducer is still triggering an issue:
BUG: corrupted list in nvmet_fc_remove_port

 non-slab/vmalloc memory
list_del corruption. prev->next should be ffff88802b1c4020, but was 0000000000000000. (prev=ffffffff9aecd380)
------------[ cut here ]------------
kernel BUG at lib/list_debug.c:64!
Oops: invalid opcode: 0000 [#1] SMP KASAN PTI
CPU: 1 UID: 0 PID: 6659 Comm: syz.1.38 Not tainted syzkaller #0 PREEMPT_{RT,(full)} 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/07/2026
RIP: 0010:__list_del_entry_valid_or_report+0x15a/0x190 lib/list_debug.c:62
Code: e8 fb f0 37 fd 43 80 3c 2c 00 74 08 4c 89 ff e8 bc b7 58 fd 49 8b 17 48 c7 c7 40 6f cc 8b 48 89 de 4c 89 f9 e8 e7 82 4c fc 90 <0f> 0b 4c 89 f7 e8 cc f0 37 fd 43 80 3c 2c 00 74 08 4c 89 ff e8 8d
RSP: 0018:ffffc90004f07c30 EFLAGS: 00010246
RAX: 000000000000006d RBX: ffff88802b1c4020 RCX: 1c46e68f21e3c500
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000201 R08: 0000000000000000 R09: 0000000000000000
R10: dffffc0000000000 R11: ffffed10170a490b R12: 1ffffffff35d9a70
R13: dffffc0000000000 R14: ffffffff85f7f100 R15: ffffffff9aecd380
FS:  00007fccc25bd6c0(0000) GS:ffff888124abb000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fbda5aaf000 CR3: 000000002c6f4000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 __list_del_entry_valid include/linux/list.h:140 [inline]
 __list_del_entry include/linux/list.h:261 [inline]
 list_del include/linux/list.h:275 [inline]
 nvmet_fc_portentry_unbind drivers/nvme/target/fc.c:1281 [inline]
 nvmet_fc_remove_port+0x16b/0x320 drivers/nvme/target/fc.c:2928
 nvmet_disable_port+0x13e/0x1f0 drivers/nvme/target/core.c:400
 nvmet_port_subsys_drop_link+0x1e8/0x210 drivers/nvme/target/configfs.c:1123
 configfs_unlink+0x44f/0x6b0 fs/configfs/symlink.c:258
 vfs_unlink+0x27b/0x6e0 fs/namei.c:5648
 filename_unlinkat+0x3d3/0x610 fs/namei.c:5718
 __do_sys_unlinkat fs/namei.c:5747 [inline]
 __se_sys_unlinkat+0x83/0x1a0 fs/namei.c:5739
 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
 do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fccc2f7e1d9
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fccc25bd028 EFLAGS: 00000246 ORIG_RAX: 0000000000000107
RAX: ffffffffffffffda RBX: 00007fccc3206090 RCX: 00007fccc2f7e1d9
RDX: 0000000000000000 RSI: 0000200000000780 RDI: ffffffffffffff9c
RBP: 00007fccc3015888 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fccc3206128 R14: 00007fccc3206090 R15: 00007ffcdc929c08
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:__list_del_entry_valid_or_report+0x15a/0x190 lib/list_debug.c:62
Code: e8 fb f0 37 fd 43 80 3c 2c 00 74 08 4c 89 ff e8 bc b7 58 fd 49 8b 17 48 c7 c7 40 6f cc 8b 48 89 de 4c 89 f9 e8 e7 82 4c fc 90 <0f> 0b 4c 89 f7 e8 cc f0 37 fd 43 80 3c 2c 00 74 08 4c 89 ff e8 8d
RSP: 0018:ffffc90004f07c30 EFLAGS: 00010246
RAX: 000000000000006d RBX: ffff88802b1c4020 RCX: 1c46e68f21e3c500
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000201 R08: 0000000000000000 R09: 0000000000000000
R10: dffffc0000000000 R11: ffffed10170a490b R12: 1ffffffff35d9a70
R13: dffffc0000000000 R14: ffffffff85f7f100 R15: ffffffff9aecd380
FS:  00007fccc25bd6c0(0000) GS:ffff888124abb000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fbda5aaf000 CR3: 000000002c6f4000 CR4: 00000000003526f0


Tested on:

commit:         58161ead Merge tag 'drm-fixes-2026-10-17' of https://g..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=179ce895580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=b38d39c45202f4fa
dashboard link: https://syzkaller.appspot.com/bug?extid=c98b21427617af7f547a
compiler:       Debian clang version 22.1.8 (1~deb13u4), Debian LLD 22.1.8
patch:          https://syzkaller.appspot.com/x/patch.diff?x=13ea960d580000