linux-kernel - Re: [syzbot] [rdma?] WARNING in rxe_skb_tx

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Message-ID: <685db3be.a00a0220.2e5631.0362.GAE@google.com>
Date: Thu, 26 Jun 2025 13:55:26 -0700
From: syzbot <syzbot+8425ccfb599521edb153@...kaller.appspotmail.com>
To: jgg@...pe.ca, leon@...nel.org, linux-kernel@...r.kernel.org, 
	linux-rdma@...r.kernel.org, syzkaller-bugs@...glegroups.com, 
	yanjun.zhu@...ux.dev, zyjzyj2000@...il.com
Subject: Re: [syzbot] [rdma?] WARNING in rxe_skb_tx_dtor

syzbot has found a reproducer for the following issue on:

HEAD commit:    ee88bddf7f2f Merge tag 'bpf-fixes' of git://git.kernel.org..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=14367182580000
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
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=10e9008c580000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=10c12f0c580000

Downloadable assets:
disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/d900f083ada3/non_bootable_disk-ee88bddf.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/258fe65055ba/vmlinux-ee88bddf.xz
kernel image: https://storage.googleapis.com/syzbot-assets/06b784a6d799/bzImage-ee88bddf.xz
mounted in repro: https://storage.googleapis.com/syzbot-assets/59084afab8b5/mount_2.gz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+8425ccfb599521edb153@...kaller.appspotmail.com

------------[ cut here ]------------
WARNING: CPU: 0 PID: 1088 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: 1088 Comm: kworker/u4:9 Not tainted 6.16.0-rc3-syzkaller-00072-gee88bddf7f2f #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 61 65 81 f9 4d 8b 37 44 89 f6 83 e6 01 31 ff e8 71 e6 1d f9 41 f6 c6 01 75 0e e8 86 e1 1d f9 90 <0f> 0b 90 e9 b4 01 00 00 4c 89 ff e8 75 89 fd 01 48 89 c7 be 0e 00
RSP: 0018:ffffc900000079e8 EFLAGS: 00010246
RAX: ffffffff88a26cea RBX: ffff888048886000 RCX: ffff8880330b4880
RDX: 0000000000000100 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000000 R09: ffffffff887bc1c4
R10: dffffc0000000000 R11: ffffffff88a26c60 R12: dffffc0000000000
R13: 1ffff11009110c0b R14: 0000000000025820 R15: ffff888033430000
FS:  0000000000000000(0000) GS:ffff88808d251000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffd7005cfa8 CR3: 0000000047588000 CR4: 0000000000352ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 skb_release_head_state+0xfe/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+0xc4/0x480 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]
 rcu_read_unlock_bh include/linux/rcupdate.h:910 [inline]
 __dev_queue_xmit+0x1cd7/0x3a70 net/core/dev.c:4740
 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+0x1b1/0x6c0 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>


---
If you want syzbot to run the reproducer, reply with:
#syz test: git://repo/address.git branch-or-commit-hash
If you attach or paste a git patch, syzbot will apply it before testing.