Re: [syzbot] [rdma?] WARNING in rxe_skb_tx_dtor

[syzbot <syzbot+8425ccfb599521edb153@syzkaller.appspotmail.com>]

Hello,

syzbot has tested the proposed patch but the reproducer is still triggering an issue:
WARNING in rxe_skb_tx_dtor

------------[ cut here ]------------
WARNING: CPU: 0 PID: 3034 at drivers/infiniband/sw/rxe/rxe_net.c:357 rxe_skb_tx_dtor+0x8b/0x2a0 drivers/infiniband/sw/rxe/rxe_net.c:357
Modules linked in:
CPU: 0 UID: 0 PID: 3034 Comm: kworker/u4:10 Not tainted 6.16.0-rc3-syzkaller-ge9ef70b277ad #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
Workqueue: rxe_wq do_work
RIP: 0010:rxe_skb_tx_dtor+0x8b/0x2a0 drivers/infiniband/sw/rxe/rxe_net.c:357
Code: 80 3c 20 00 74 08 4c 89 ff e8 c1 64 81 f9 4d 8b 37 44 89 f6 83 e6 01 31 ff e8 d1 e5 1d f9 41 f6 c6 01 75 0e e8 e6 e0 1d f9 90 <0f> 0b 90 e9 b4 01 00 00 4c 89 ff e8 45 97 fd 01 48 89 c7 be 0e 00
RSP: 0018:ffffc900000079e8 EFLAGS: 00010246
RAX: ffffffff88a26d8a RBX: ffff8880560d4500 RCX: ffff88801f722440
RDX: 0000000000000100 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000000 R09: ffffffff887bc1c4
R10: dffffc0000000000 R11: ffffffff88a26d00 R12: dffffc0000000000
R13: 1ffff1100ac1a8ab R14: 0000000000025820 R15: ffff888033440000
FS:  0000000000000000(0000) GS:ffff88808d250000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f5e595acfc8 CR3: 0000000056029000 CR4: 0000000000352ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 skb_release_head_state+0x101/0x250 net/core/skbuff.c:1139
 napi_consume_skb+0xd2/0x1e0 net/core/skbuff.c:-1
 e1000_unmap_and_free_tx_resource drivers/net/ethernet/intel/e1000/e1000_main.c:1972 [inline]
 e1000_clean_tx_irq drivers/net/ethernet/intel/e1000/e1000_main.c:3864 [inline]
 e1000_clean+0x49d/0x2b00 drivers/net/ethernet/intel/e1000/e1000_main.c:3805
 __napi_poll+0xc7/0x480 net/core/dev.c:7414
 napi_poll net/core/dev.c:7478 [inline]
 net_rx_action+0x707/0xe30 net/core/dev.c:7605
 handle_softirqs+0x286/0x870 kernel/softirq.c:579
 do_softirq+0xec/0x180 kernel/softirq.c:480
 </IRQ>
 <TASK>
 __local_bh_enable_ip+0x17d/0x1c0 kernel/softirq.c:407
 local_bh_enable include/linux/bottom_half.h:33 [inline]
 __neigh_event_send+0x9b/0x1560 net/core/neighbour.c:1194
 neigh_event_send_probe include/net/neighbour.h:463 [inline]
 neigh_event_send include/net/neighbour.h:469 [inline]
 neigh_resolve_output+0x198/0x750 net/core/neighbour.c:1496
 neigh_output include/net/neighbour.h:539 [inline]
 ip6_finish_output2+0x11fb/0x16a0 net/ipv6/ip6_output.c:141
 __ip6_finish_output net/ipv6/ip6_output.c:-1 [inline]
 ip6_finish_output+0x234/0x7d0 net/ipv6/ip6_output.c:226
 rxe_send drivers/infiniband/sw/rxe/rxe_net.c:391 [inline]
 rxe_xmit_packet+0x79e/0xa30 drivers/infiniband/sw/rxe/rxe_net.c:450
 rxe_requester+0x1fea/0x3d20 drivers/infiniband/sw/rxe/rxe_req.c:805
 rxe_sender+0x16/0x50 drivers/infiniband/sw/rxe/rxe_req.c:839
 do_task drivers/infiniband/sw/rxe/rxe_task.c:127 [inline]
 do_work+0x1b4/0x6c0 drivers/infiniband/sw/rxe/rxe_task.c:187
 process_one_work kernel/workqueue.c:3238 [inline]
 process_scheduled_works+0xae1/0x17b0 kernel/workqueue.c:3321
 worker_thread+0x8a0/0xda0 kernel/workqueue.c:3402
 kthread+0x70e/0x8a0 kernel/kthread.c:464
 ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>


Tested on:

commit:         e9ef70b2 RDNA/rxe: Fix rxe_skb_tx_dtor problem
git tree:       https://github.com/zhuyj/linux.git v6.16_fix_rxe_skb_tx_dtor
console output: https://syzkaller.appspot.com/x/log.txt?x=122183d4580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=79da270cec5ffd65
dashboard link: https://syzkaller.appspot.com/bug?extid=8425ccfb599521edb153
compiler:       Debian clang version 20.1.6 (++20250514063057+1e4d39e07757-1~exp1~20250514183223.118), Debian LLD 20.1.6

Note: no patches were applied.