[syzbot] [net?] [bpf?] WARNING in sock_map_destroy (3)
From: syzbot
Date: Thu Apr 02 2026 - 15:39:56 EST
Hello,
syzbot found the following issue on:
HEAD commit: 1b237f190eb3 Linux 6.17-rc3
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=13551c42580000
kernel config: https://syzkaller.appspot.com/x/.config?x=e1e1566c7726877e
dashboard link: https://syzkaller.appspot.com/bug?extid=b0842d38af58376d1fdc
compiler: Debian clang version 20.1.7 (++20250616065708+6146a88f6049-1~exp1~20250616065826.132), Debian LLD 20.1.7
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=168d6ef0580000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=16f57862580000
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/d708c97252af/disk-1b237f19.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/3b964889e9fe/vmlinux-1b237f19.xz
kernel image: https://storage.googleapis.com/syzbot-assets/2d05741e1ef1/bzImage-1b237f19.xz
The issue was bisected to:
commit 8259eb0e06d8f64c700f5fbdb28a5c18e10de291
Author: Jiayuan Chen <jiayuan.chen@xxxxxxxxx>
Date: Fri May 16 14:17:12 2025 +0000
bpf, sockmap: Avoid using sk_socket after free when sending
bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=17fbce62580000
final oops: https://syzkaller.appspot.com/x/report.txt?x=1407ce62580000
console output: https://syzkaller.appspot.com/x/log.txt?x=1007ce62580000
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+b0842d38af58376d1fdc@xxxxxxxxxxxxxxxxxxxxxxxxx
Fixes: 8259eb0e06d8 ("bpf, sockmap: Avoid using sk_socket after free when sending")
------------[ cut here ]------------
WARNING: CPU: 1 PID: 8459 at net/core/sock_map.c:1667 sock_map_destroy+0x28b/0x2b0 net/core/sock_map.c:1667
Modules linked in:
CPU: 1 UID: 0 PID: 8459 Comm: syz.0.1109 Not tainted syzkaller #0 PREEMPT_{RT,(full)}
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
RIP: 0010:sock_map_destroy+0x28b/0x2b0 net/core/sock_map.c:1667
Code: 8b 36 49 83 c6 38 4c 89 f0 48 c1 e8 03 42 80 3c 38 00 74 08 4c 89 f7 e8 93 62 22 f9 4d 8b 3e e9 79 ff ff ff e8 a6 2b c3 f8 90 <0f> 0b 90 eb 9c e8 9b 2b c3 f8 4c 89 e7 be 03 00 00 00 e8 0e 4e bc
RSP: 0018:ffffc9000d067be8 EFLAGS: 00010293
RAX: ffffffff88fb30aa RBX: ffff888024832000 RCX: ffff888024283b80
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000000
R10: dffffc0000000000 R11: ffffed100862e946 R12: dffffc0000000000
R13: ffff888024832000 R14: ffffffff995b2208 R15: ffffffff88fb2e20
FS: 0000555579a7d500(0000) GS:ffff8881269c2000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00002000000048c0 CR3: 000000003713a000 CR4: 00000000003526f0
Call Trace:
<TASK>
inet_csk_destroy_sock+0x166/0x3a0 net/ipv4/inet_connection_sock.c:1294
__tcp_close+0xcc1/0xfd0 net/ipv4/tcp.c:3262
tcp_close+0x28/0x110 net/ipv4/tcp.c:3274
inet_release+0x144/0x190 net/ipv4/af_inet.c:435
__sock_release net/socket.c:649 [inline]
sock_close+0xc0/0x240 net/socket.c:1439
__fput+0x45b/0xa80 fs/file_table.c:468
task_work_run+0x1d4/0x260 kernel/task_work.c:227
resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
exit_to_user_mode_loop+0xec/0x110 kernel/entry/common.c:43
exit_to_user_mode_prepare include/linux/irq-entry-common.h:225 [inline]
syscall_exit_to_user_mode_work include/linux/entry-common.h:175 [inline]
syscall_exit_to_user_mode include/linux/entry-common.h:210 [inline]
do_syscall_64+0x2bd/0x3b0 arch/x86/entry/syscall_64.c:100
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f265847ebe9
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:00007ffd158dfbd8 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4
RAX: 0000000000000000 RBX: 000000000002ddb0 RCX: 00007f265847ebe9
RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003
RBP: 00007f26586a7da0 R08: 0000000000000001 R09: 0000000e158dfecf
R10: 0000001b30a20000 R11: 0000000000000246 R12: 00007f26586a5fac
R13: 00007f26586a5fa0 R14: ffffffffffffffff R15: 00007ffd158dfcf0
</TASK>
---
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