linux-kernel - Re: [syzbot] [net?] WARNING in inet_csk_get

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Date: Mon, 27 May 2024 14:06:06 -0700
From: syzbot <syzbot+2459c1b9fcd39be822b1@...kaller.appspotmail.com>
To: hdanton@...a.com, linux-kernel@...r.kernel.org, 
	syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [net?] WARNING in inet_csk_get_port (3)

Hello,

syzbot has tested the proposed patch but the reproducer is still triggering an issue:
INFO: rcu detected stall in corrupted

rcu: INFO: rcu_preempt detected expedited stalls on CPUs/tasks: { 1-.... } 2676 jiffies s: 3265 root: 0x2/.
rcu: blocking rcu_node structures (internal RCU debug):
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 6099 Comm: syz-executor.1 Not tainted 6.9.0-rc4-syzkaller-00266-g977b1ef51866-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/02/2024
RIP: 0010:write_comp_data+0x34/0x90 kernel/kcov.c:236
Code: 48 8b 15 ff 1b 76 7e 65 8b 05 00 1c 76 7e a9 00 01 ff 00 74 0f f6 c4 01 74 59 8b 82 14 16 00 00 85 c0 74 4f 8b 82 f0 15 00 00 <83> f8 03 75 44 48 8b 82 f8 15 00 00 8b 92 f4 15 00 00 48 8b 38 48
RSP: 0018:ffffc90002e5fc88 EFLAGS: 00000246
RAX: 0000000000000000 RBX: ffff888068e7cb40 RCX: ffffffff894209a1
RDX: ffff88801bfa8000 RSI: 0000000000000000 RDI: 0000000000000001
RBP: ffff888068e7cb40 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000020 R11: 0000000000000003 R12: dffffc0000000000
R13: 0000000000000020 R14: 0000000000000000 R15: ffffed100d1cf96a
FS:  00007fe3784b36c0(0000) GS:ffff8880b9500000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f7b05dac000 CR3: 0000000011a78000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <NMI>
 </NMI>
 <TASK>
 __inet_bhash2_conflict net/ipv4/inet_connection_sock.c:206 [inline]
 inet_bhash2_conflict.isra.0+0xb1/0x210 net/ipv4/inet_connection_sock.c:229
 inet_csk_bind_conflict+0x40c/0x630 net/ipv4/inet_connection_sock.c:264
 inet_csk_get_port+0x1639/0x25b0 net/ipv4/inet_connection_sock.c:585
 inet_csk_listen_start+0x15e/0x390 net/ipv4/inet_connection_sock.c:1281
 inet_dccp_listen+0x1c5/0x220 net/dccp/proto.c:951
 __sys_listen+0x19b/0x280 net/socket.c:1881
 __do_sys_listen net/socket.c:1890 [inline]
 __se_sys_listen net/socket.c:1888 [inline]
 __x64_sys_listen+0x53/0x80 net/socket.c:1888
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcf/0x260 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fe37767dea9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 00 00 90 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 b0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fe3784b30c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000032
RAX: ffffffffffffffda RBX: 00007fe3777abf80 RCX: 00007fe37767dea9
RDX: 0000000000000000 RSI: 0000000020000005 RDI: 0000000000000003
RBP: 00007fe3776ca4a4 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000000b R14: 00007fe3777abf80 R15: 00007fff4057e238
 </TASK>


Tested on:

commit:         977b1ef5 Merge tag 'block-6.9-20240420' of git://git.k..
git tree:       https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
console output: https://syzkaller.appspot.com/x/log.txt?x=1530f71a980000
kernel config:  https://syzkaller.appspot.com/x/.config?x=85dbe39cf8e4f599
dashboard link: https://syzkaller.appspot.com/bug?extid=2459c1b9fcd39be822b1
compiler:       gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40
patch:          https://syzkaller.appspot.com/x/patch.diff?x=13e5e7f0980000