Subject: [syzbot] [mptcp?] WARNING in mptcp_pm_nl_set_flags

From: syzbot <[email-masked]>
Date: Mon, 26 Aug 2024 01:50:25 -0700

Hello,

syzbot found the following issue on:

HEAD commit:    8af174ea863c net: mana: Fix race of mana_hwc_post_rx_wqe a..
git tree:       net
console output: https://syzkaller.appspot.com/x/log.txt?x=1718a993980000
kernel config:  https://syzkaller.appspot.com/x/.config?x=df2f0ed7e30a639d
dashboard link: https://syzkaller.appspot.com/bug?extid=455d38ecd5f655fc45cf
compiler:       Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=10a653d5980000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/86225fd99eec/disk-8af174ea.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/fc4394f330d4/vmlinux-8af174ea.xz
kernel image: https://storage.googleapis.com/syzbot-assets/1f30959324a7/bzImage-8af174ea.xz

The issue was bisected to:

commit 322ea3778965da72862cca2a0c50253aacf65fe6
Author: Matthieu Baerts (NGI0) <[email-masked]>
Date:   Mon Aug 19 19:45:26 2024 +0000

    mptcp: pm: only mark 'subflow' endp as available

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=159fb015980000
final oops:     https://syzkaller.appspot.com/x/report.txt?x=179fb015980000
console output: https://syzkaller.appspot.com/x/log.txt?x=139fb015980000

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: [email-masked]
Fixes: 322ea3778965 ("mptcp: pm: only mark 'subflow' endp as available")

------------[ cut here ]------------
WARNING: CPU: 1 PID: 5507 at net/mptcp/pm_netlink.c:1467 __mark_subflow_endp_available net/mptcp/pm_netlink.c:1467 [inline]
WARNING: CPU: 1 PID: 5507 at net/mptcp/pm_netlink.c:1467 mptcp_pm_nl_fullmesh net/mptcp/pm_netlink.c:1948 [inline]
WARNING: CPU: 1 PID: 5507 at net/mptcp/pm_netlink.c:1467 mptcp_nl_set_flags net/mptcp/pm_netlink.c:1971 [inline]
WARNING: CPU: 1 PID: 5507 at net/mptcp/pm_netlink.c:1467 mptcp_pm_nl_set_flags+0x926/0xd50 net/mptcp/pm_netlink.c:2032
Modules linked in:
CPU: 1 UID: 0 PID: 5507 Comm: syz.3.20 Not tainted 6.11.0-rc4-syzkaller-00138-g8af174ea863c #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024
RIP: 0010:__mark_subflow_endp_available net/mptcp/pm_netlink.c:1467 [inline]
RIP: 0010:mptcp_pm_nl_fullmesh net/mptcp/pm_netlink.c:1948 [inline]
RIP: 0010:mptcp_nl_set_flags net/mptcp/pm_netlink.c:1971 [inline]
RIP: 0010:mptcp_pm_nl_set_flags+0x926/0xd50 net/mptcp/pm_netlink.c:2032
Code: 00 00 00 49 89 c5 e8 29 b4 ef f5 e9 08 fd ff ff e8 1f b4 ef f5 4c 89 f7 be 03 00 00 00 e8 02 1c 0d f9 eb a0 e8 0b b4 ef f5 90 <0f> 0b 90 e9 14 ff ff ff 89 d9 80 e1 07 38 c1 0f 8c 19 fd ff ff 48
RSP: 0018:ffffc90003adf2a0 EFLAGS: 00010293
RAX: ffffffff8ba3d735 RBX: 1ffff11005fae2ca RCX: ffff888016b73c00
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc90003adf470 R08: ffffffff8ba3d621 R09: 1ffff11005fae2cb
R10: dffffc0000000000 R11: ffffed1005fae2cc R12: ffff88802fd71608
R13: ffff88802fd70bc0 R14: 0000000000000000 R15: ffff88802fd71650
FS:  00007fe0b3ff86c0(0000) GS:ffff8880b9300000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f0485fd5fb8 CR3: 000000002e73e000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 genl_family_rcv_msg_doit net/netlink/genetlink.c:1115 [inline]
 genl_family_rcv_msg net/netlink/genetlink.c:1195 [inline]
 genl_rcv_msg+0xb14/0xec0 net/netlink/genetlink.c:1210
 netlink_rcv_skb+0x1e3/0x430 net/netlink/af_netlink.c:2550
 genl_rcv+0x28/0x40 net/netlink/genetlink.c:1219
 netlink_unicast_kernel net/netlink/af_netlink.c:1331 [inline]
 netlink_unicast+0x7f6/0x990 net/netlink/af_netlink.c:1357
 netlink_sendmsg+0x8e4/0xcb0 net/netlink/af_netlink.c:1901
 sock_sendmsg_nosec net/socket.c:730 [inline]
 __sock_sendmsg+0x221/0x270 net/socket.c:745
 ____sys_sendmsg+0x525/0x7d0 net/socket.c:2597
 ___sys_sendmsg net/socket.c:2651 [inline]
 __sys_sendmsg+0x2b0/0x3a0 net/socket.c:2680
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fe0b3179e79
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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fe0b3ff8038 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007fe0b3316058 RCX: 00007fe0b3179e79
RDX: 0000000000000000 RSI: 0000000020000480 RDI: 0000000000000009
RBP: 00007fe0b31e793e R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007fe0b3316058 R15: 00007ffd9b67c0d8
 </TASK>

---
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