[syzbot] [dccp?] general protection fault in dccp_write_xmit (2)

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit: 05d3ef8bba77 Linux 6.6-rc7
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=120b3971680000
kernel config: https://syzkaller.appspot.com/x/.config?x=667b53b8e7487997
dashboard link: https://syzkaller.appspot.com/bug?extid=c71bc336c5061153b502
compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40

Unfortunately, I don't have any reproducer for this issue yet.

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/a9faa0dd3d80/disk-05d3ef8b.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/cea22e55cef7/vmlinux-05d3ef8b.xz
kernel image: https://storage.googleapis.com/syzbot-assets/d0679f322d2a/bzImage-05d3ef8b.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+c71bc3...@syzkaller.appspotmail.com

general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007]
CPU: 1 PID: 1906 Comm: syz-executor.4 Not tainted 6.6.0-rc7-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/06/2023
RIP: 0010:ccid_hc_tx_send_packet net/dccp/ccid.h:166 [inline]
RIP: 0010:dccp_write_xmit+0x66/0x1d0 net/dccp/output.c:356
Code: 00 48 85 c0 49 89 c4 0f 84 03 01 00 00 e8 52 d8 0c f8 41 80 3e 00 0f 85 45 01 00 00 48 8b 9d f8 08 00 00 48 89 d8 48 c1 e8 03 <42> 80 3c 28 00 0f 85 1f 01 00 00 48 8b 1b 48 8d bb b0 00 00 00 48
RSP: 0018:ffffc90004cff870 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: ffff888016f85940 RSI: ffffffff897af1de RDI: ffff888020ba5c40
RBP: ffff888020ba5c40 R08: 0000000000000001 R09: fffffbfff2339be7
R10: ffffffff919cdf3f R11: 0000000000000000 R12: ffff888075c38280
R13: dffffc0000000000 R14: ffffed1004174ca7 R15: ffff888020ba6538
FS: 00007f31f81d66c0(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f9c878ffc83 CR3: 0000000066952000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<TASK>
dccp_sendmsg+0x968/0xcc0 net/dccp/proto.c:801
inet_sendmsg+0x9d/0xe0 net/ipv4/af_inet.c:846
sock_sendmsg_nosec net/socket.c:730 [inline]
__sock_sendmsg+0xd5/0x180 net/socket.c:745
____sys_sendmsg+0x2ac/0x940 net/socket.c:2558
___sys_sendmsg+0x135/0x1d0 net/socket.c:2612
__sys_sendmmsg+0x1a1/0x450 net/socket.c:2698
__do_sys_sendmmsg net/socket.c:2727 [inline]
__se_sys_sendmmsg net/socket.c:2724 [inline]
__x64_sys_sendmmsg+0x9c/0x100 net/socket.c:2724
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x38/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f31f747cae9
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:00007f31f81d60c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000133
RAX: ffffffffffffffda RBX: 00007f31f759c050 RCX: 00007f31f747cae9
RDX: 0000000000000002 RSI: 00000000200014c0 RDI: 0000000000000004
RBP: 00007f31f74c847a R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000000b R14: 00007f31f759c050 R15: 00007f31f76bfa48
</TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:ccid_hc_tx_send_packet net/dccp/ccid.h:166 [inline]
RIP: 0010:dccp_write_xmit+0x66/0x1d0 net/dccp/output.c:356
Code: 00 48 85 c0 49 89 c4 0f 84 03 01 00 00 e8 52 d8 0c f8 41 80 3e 00 0f 85 45 01 00 00 48 8b 9d f8 08 00 00 48 89 d8 48 c1 e8 03 <42> 80 3c 28 00 0f 85 1f 01 00 00 48 8b 1b 48 8d bb b0 00 00 00 48
RSP: 0018:ffffc90004cff870 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: ffff888016f85940 RSI: ffffffff897af1de RDI: ffff888020ba5c40
RBP: ffff888020ba5c40 R08: 0000000000000001 R09: fffffbfff2339be7
R10: ffffffff919cdf3f R11: 0000000000000000 R12: ffff888075c38280
R13: dffffc0000000000 R14: ffffed1004174ca7 R15: ffff888020ba6538
FS: 00007f31f81d66c0(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f5f4e398000 CR3: 0000000066952000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
0: 00 48 85 add %cl,-0x7b(%rax)
3: c0 49 89 c4 rorb $0xc4,-0x77(%rcx)
7: 0f 84 03 01 00 00 je 0x110
d: e8 52 d8 0c f8 call 0xf80cd864
12: 41 80 3e 00 cmpb $0x0,(%r14)
16: 0f 85 45 01 00 00 jne 0x161
1c: 48 8b 9d f8 08 00 00 mov 0x8f8(%rbp),%rbx
23: 48 89 d8 mov %rbx,%rax
26: 48 c1 e8 03 shr $0x3,%rax
* 2a: 42 80 3c 28 00 cmpb $0x0,(%rax,%r13,1) <-- trapping instruction
2f: 0f 85 1f 01 00 00 jne 0x154
35: 48 8b 1b mov (%rbx),%rbx
38: 48 8d bb b0 00 00 00 lea 0xb0(%rbx),%rdi
3f: 48 rex.W


---
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#syz undup

[syzbot]

syzbot has found a reproducer for the following issue on:

HEAD commit: d2f51b3516da Merge tag 'rtc-6.7' of git://git.kernel.org/p..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=16675f40e80000
kernel config: https://syzkaller.appspot.com/x/.config?x=cd456c5e6582895e

dashboard link: https://syzkaller.appspot.com/bug?extid=c71bc336c5061153b502
compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40

syz repro: https://syzkaller.appspot.com/x/repro.syz?x=167ac787680000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1799f190e80000

Downloadable assets:
disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/7bc7510fe41f/non_bootable_disk-d2f51b35.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/d678011e498e/vmlinux-d2f51b35.xz
kernel image: https://storage.googleapis.com/syzbot-assets/4f6ed772923d/bzImage-d2f51b35.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+c71bc3...@syzkaller.appspotmail.com

general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007]

CPU: 3 PID: 5345 Comm: syz-executor785 Not tainted 6.6.0-syzkaller-14651-gd2f51b3516da #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014

RIP: 0010:ccid_hc_tx_send_packet net/dccp/ccid.h:166 [inline]
RIP: 0010:dccp_write_xmit+0x66/0x1d0 net/dccp/output.c:356

Code: 00 48 85 c0 49 89 c4 0f 84 03 01 00 00 e8 82 5f cd f7 41 80 3e 00 0f 85 45 01 00 00 48 8b 9d f8 08 00 00 48 89 d8 48 c1 e8 03 <42> 80 3c 28 00 0f 85 1f 01 00 00 48 8b 1b 48 8d bb b0 00 00 00 48
RSP: 0018:ffffc90003797870 EFLAGS: 00010246

RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000

RDX: ffff88802a2bd000 RSI: ffffffff89ba330e RDI: ffff88802d7d9540
RBP: ffff88802d7d9540 R08: 0000000000000001 R09: fffffbfff23e11e9
R10: ffffffff91f08f4f R11: ffffffff915e5030 R12: ffff8880186c9cc0
R13: dffffc0000000000 R14: ffffed1005afb3c7 R15: ffff88802d7d9e38
FS: 00007f263ceef6c0(0000) GS:ffff88806b900000(0000) knlGS:0000000000000000

CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033

CR2: 0000000020002980 CR3: 000000001b2ab000 CR4: 0000000000350ef0

DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<TASK>
dccp_sendmsg+0x968/0xcc0 net/dccp/proto.c:801

inet_sendmsg+0x9d/0xe0 net/ipv4/af_inet.c:847

sock_sendmsg_nosec net/socket.c:730 [inline]
__sock_sendmsg+0xd5/0x180 net/socket.c:745

____sys_sendmsg+0x2ac/0x940 net/socket.c:2588
___sys_sendmsg+0x135/0x1d0 net/socket.c:2642
__sys_sendmmsg+0x1a1/0x450 net/socket.c:2728
__do_sys_sendmmsg net/socket.c:2757 [inline]
__se_sys_sendmmsg net/socket.c:2754 [inline]
__x64_sys_sendmmsg+0x9c/0x100 net/socket.c:2754
do_syscall_x64 arch/x86/entry/common.c:51 [inline]
do_syscall_64+0x3f/0x110 arch/x86/entry/common.c:82
entry_SYSCALL_64_after_hwframe+0x63/0x6b
RIP: 0033:0x7f263cf53559
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 61 1a 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:00007f263ceef218 EFLAGS: 00000246 ORIG_RAX: 0000000000000133
RAX: ffffffffffffffda RBX: 00007f263cfdd438 RCX: 00007f263cf53559
RDX: 0400000000000239 RSI: 0000000020002980 RDI: 0000000000000006
RBP: 00007f263cfdd430 R08: 00007fff5b335167 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f263cfdd43c
R13: 00007f263cfaa504 R14: 0400000000000239 R15: 00007fff5b335168

</TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:ccid_hc_tx_send_packet net/dccp/ccid.h:166 [inline]
RIP: 0010:dccp_write_xmit+0x66/0x1d0 net/dccp/output.c:356

Code: 00 48 85 c0 49 89 c4 0f 84 03 01 00 00 e8 82 5f cd f7 41 80 3e 00 0f 85 45 01 00 00 48 8b 9d f8 08 00 00 48 89 d8 48 c1 e8 03 <42> 80 3c 28 00 0f 85 1f 01 00 00 48 8b 1b 48 8d bb b0 00 00 00 48
RSP: 0018:ffffc90003797870 EFLAGS: 00010246

RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000

RDX: ffff88802a2bd000 RSI: ffffffff89ba330e RDI: ffff88802d7d9540
RBP: ffff88802d7d9540 R08: 0000000000000001 R09: fffffbfff23e11e9
R10: ffffffff91f08f4f R11: ffffffff915e5030 R12: ffff8880186c9cc0
R13: dffffc0000000000 R14: ffffed1005afb3c7 R15: ffff88802d7d9e38
FS: 00007f263ceef6c0(0000) GS:ffff88806b900000(0000) knlGS:0000000000000000

CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033

CR2: 0000000020002980 CR3: 000000001b2ab000 CR4: 0000000000350ef0

DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
0: 00 48 85 add %cl,-0x7b(%rax)
3: c0 49 89 c4 rorb $0xc4,-0x77(%rcx)
7: 0f 84 03 01 00 00 je 0x110

d: e8 82 5f cd f7 call 0xf7cd5f94

12: 41 80 3e 00 cmpb $0x0,(%r14)
16: 0f 85 45 01 00 00 jne 0x161
1c: 48 8b 9d f8 08 00 00 mov 0x8f8(%rbp),%rbx
23: 48 89 d8 mov %rbx,%rax
26: 48 c1 e8 03 shr $0x3,%rax
* 2a: 42 80 3c 28 00 cmpb $0x0,(%rax,%r13,1) <-- trapping instruction
2f: 0f 85 1f 01 00 00 jne 0x154
35: 48 8b 1b mov (%rbx),%rbx
38: 48 8d bb b0 00 00 00 lea 0xb0(%rbx),%rdi
3f: 48 rex.W


---

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.

[syzbot]

syzbot has bisected this issue to:

commit 419ce133ab928ab5efd7b50b2ef36ddfd4eadbd2
Author: Paolo Abeni <pab...@redhat.com>
Date: Wed Oct 11 07:20:55 2023 +0000

tcp: allow again tcp_disconnect() when threads are waiting

bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=142a647b680000
start commit: ff269e2cd5ad Merge tag 'net-next-6.7-followup' of git://gi..
git tree: net-next
final oops: https://syzkaller.appspot.com/x/report.txt?x=162a647b680000
console output: https://syzkaller.appspot.com/x/log.txt?x=122a647b680000
kernel config: https://syzkaller.appspot.com/x/.config?x=53cdcbf124ea14aa
dashboard link: https://syzkaller.appspot.com/bug?extid=c71bc336c5061153b502
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=142bff40e80000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1559f190e80000

Reported-by: syzbot+c71bc3...@syzkaller.appspotmail.com
Fixes: 419ce133ab92 ("tcp: allow again tcp_disconnect() when threads are waiting")

For information about bisection process see: https://goo.gl/tpsmEJ#bisection