[syzbot] [can?] WARNING in j1939_xtp_rx_rts

From: syzbot
Date: Wed Nov 01 2023 - 15:39:37 EST

Hello,

syzbot found the following issue on:

HEAD commit: 2af9b20dbb39 Merge tag 'x86-urgent-2023-10-28' of git://gi..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=12257ac3680000
kernel config: https://syzkaller.appspot.com/x/.config?x=7d1f30869bb78ec6
dashboard link: https://syzkaller.appspot.com/bug?extid=daa36413a5cedf799ae4
compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40
userspace arch: i386

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

Downloadable assets:
disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/7bc7510fe41f/non_bootable_disk-2af9b20d.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/1e66f0c379e2/vmlinux-2af9b20d.xz
kernel image: https://storage.googleapis.com/syzbot-assets/3732b6e62161/bzImage-2af9b20d.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+daa36413a5cedf799ae4@xxxxxxxxxxxxxxxxxxxxxxxxx

WARNING: CPU: 2 PID: 5504 at net/can/j1939/transport.c:1656 j1939_xtp_rx_rts_session_new net/can/j1939/transport.c:1656 [inline]
WARNING: CPU: 2 PID: 5504 at net/can/j1939/transport.c:1656 j1939_xtp_rx_rts+0x1553/0x17e0 net/can/j1939/transport.c:1735
Modules linked in:
CPU: 2 PID: 5504 Comm: syz-executor.3 Not tainted 6.6.0-rc7-syzkaller-00195-g2af9b20dbb39 #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
RIP: 0010:j1939_xtp_rx_rts_session_new net/can/j1939/transport.c:1656 [inline]
RIP: 0010:j1939_xtp_rx_rts+0x1553/0x17e0 net/can/j1939/transport.c:1735
Code: 00 48 89 ef e8 fe d9 eb fa e9 42 ef ff ff e8 b4 1b 4e f8 be 01 00 00 00 48 89 ef e8 e7 d9 eb fa e9 a8 f9 ff ff e8 9d 1b 4e f8 <0f> 0b 48 8d 83 c0 00 00 00 4c 8d b3 c2 00 00 00 48 89 44 24 10 e9
RSP: 0018:ffffc90000520950 EFLAGS: 00010246

RAX: 0000000000000000 RBX: ffff8880267b8400 RCX: 0000000000000100
RDX: ffff88807058c800 RSI: ffffffff8939be93 RDI: 0000000000000005
RBP: 00000000fffffff5 R08: 0000000000000005 R09: 0000000000000000
R10: 00000000fffffff5 R11: dffffc0000000000 R12: ffff8880198ec000
R13: 0000000000000002 R14: ffff888074db3c1b R15: 0000000000000002
FS: 0000000000000000(0000) GS:ffff88802c800000(0063) knlGS:00000000f7fc4b40
CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033
CR2: 000000002fa23000 CR3: 000000004a9cd000 CR4: 0000000000350ee0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<IRQ>
j1939_tp_cmd_recv net/can/j1939/transport.c:2057 [inline]
j1939_tp_recv+0x366/0xf50 net/can/j1939/transport.c:2144
j1939_can_recv+0x78b/0xa70 net/can/j1939/main.c:112
deliver net/can/af_can.c:572 [inline]
can_rcv_filter+0x2a5/0x8e0 net/can/af_can.c:606
can_receive+0x31b/0x5c0 net/can/af_can.c:663
can_rcv+0x1dc/0x270 net/can/af_can.c:687
__netif_receive_skb_one_core+0x115/0x180 net/core/dev.c:5552
__netif_receive_skb+0x1f/0x1b0 net/core/dev.c:5666
process_backlog+0x101/0x6b0 net/core/dev.c:5994
__napi_poll.constprop.0+0xb4/0x530 net/core/dev.c:6556
napi_poll net/core/dev.c:6623 [inline]
net_rx_action+0x956/0xe90 net/core/dev.c:6756
__do_softirq+0x218/0x965 kernel/softirq.c:553
do_softirq kernel/softirq.c:454 [inline]
do_softirq+0xaa/0xe0 kernel/softirq.c:441
</IRQ>
<TASK>
__local_bh_enable_ip+0xf8/0x120 kernel/softirq.c:381
j1939_sk_sendmsg+0xeb7/0x13a0 net/can/j1939/socket.c:1266
sock_sendmsg_nosec net/socket.c:730 [inline]
__sock_sendmsg+0xd5/0x180 net/socket.c:745
____sys_sendmsg+0x6ac/0x940 net/socket.c:2558
___sys_sendmsg+0x135/0x1d0 net/socket.c:2612
__sys_sendmsg+0x117/0x1e0 net/socket.c:2641
do_syscall_32_irqs_on arch/x86/entry/common.c:112 [inline]
__do_fast_syscall_32+0x61/0xe0 arch/x86/entry/common.c:178
do_fast_syscall_32+0x33/0x70 arch/x86/entry/common.c:203
entry_SYSENTER_compat_after_hwframe+0x70/0x82
RIP: 0023:0xf7fc9579
Code: b8 01 10 06 03 74 b4 01 10 07 03 74 b0 01 10 08 03 74 d8 01 00 00 00 00 00 00 00 00 00 00 00 00 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 8d b4 26 00 00 00 00 8d b4 26 00 00 00 00
RSP: 002b:00000000f7fc45ac EFLAGS: 00000292 ORIG_RAX: 0000000000000172
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000020000200
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000292 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
</TASK>
----------------
Code disassembly (best guess), 2 bytes skipped:
0: 10 06 adc %al,(%rsi)
2: 03 74 b4 01 add 0x1(%rsp,%rsi,4),%esi
6: 10 07 adc %al,(%rdi)
8: 03 74 b0 01 add 0x1(%rax,%rsi,4),%esi
c: 10 08 adc %cl,(%rax)
e: 03 74 d8 01 add 0x1(%rax,%rbx,8),%esi
1e: 00 51 52 add %dl,0x52(%rcx)
21: 55 push %rbp
22: 89 e5 mov %esp,%ebp
24: 0f 34 sysenter
26: cd 80 int $0x80
* 28: 5d pop %rbp <-- trapping instruction
29: 5a pop %rdx
2a: 59 pop %rcx
2b: c3 ret
2c: 90 nop
2d: 90 nop
2e: 90 nop
2f: 90 nop
30: 8d b4 26 00 00 00 00 lea 0x0(%rsi,%riz,1),%esi
37: 8d b4 26 00 00 00 00 lea 0x0(%rsi,%riz,1),%esi


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