Hello, syzbot found the following issue on: HEAD commit: 7993e65fdd0f Merge tag 'mtd/fixes-for-5.17-rc5' of git://g.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=16c9b264700000 kernel config: https://syzkaller.appspot.com/x/.config?x=b41a243aa9878175 dashboard link: https://syzkaller.appspot.com/bug?extid=3d2eaacbc2b94537c6c5 compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=133ec75a700000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1039840a700000 IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+3d2eaacbc2b94537c6c5@xxxxxxxxxxxxxxxxxxxxxxxxx vcan0: j1939_xtp_rx_dat_one: 0xffff88801fdd2800: Data of RX-looped back packet (00 ff ff ff ff ff ff) doesn't match TX data (00 00 00 00 00 00 00)! vcan0: j1939_xtp_rx_dat_one: 0xffff88801c86f000: last 15 vcan0: j1939_xtp_rx_abort_one: 0xffff88801fdd2800: 0x00000: (5) Maximal retransmit request limit reached vcan0: j1939_xtp_rx_abort_one: 0xffff88801fdd2000: 0x00000: (5) Maximal retransmit request limit reached ------------[ cut here ]------------ WARNING: CPU: 0 PID: 13 at net/can/j1939/transport.c:1090 j1939_session_deactivate net/can/j1939/transport.c:1090 [inline] WARNING: CPU: 0 PID: 13 at net/can/j1939/transport.c:1090 j1939_session_deactivate_activate_next+0x95/0xd3 net/can/j1939/transport.c:1100 Modules linked in: CPU: 0 PID: 13 Comm: ksoftirqd/0 Not tainted 5.17.0-rc4-syzkaller-00217-g7993e65fdd0f #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:j1939_session_deactivate net/can/j1939/transport.c:1090 [inline] RIP: 0010:j1939_session_deactivate_activate_next+0x95/0xd3 net/can/j1939/transport.c:1100 Code: 03 38 d0 7c 0c 84 d2 74 08 4c 89 ef e8 73 71 75 f8 8b 5d 28 bf 01 00 00 00 89 de e8 04 e3 2d f8 83 fb 01 77 07 e8 7a df 2d f8 <0f> 0b e8 73 df 2d f8 48 89 ef e8 8b 7a de fe 4c 89 e7 89 c3 e8 e1 RSP: 0018:ffffc90000d279b0 EFLAGS: 00010246 RAX: 0000000000000000 RBX: 0000000000000001 RCX: 0000000000000100 RDX: ffff888011918000 RSI: ffffffff894afea6 RDI: 0000000000000003 RBP: ffff88801fdd2000 R08: 0000000000000001 R09: ffff88801fdd202b R10: ffffffff894afe9c R11: 0000000000000000 R12: ffff88801dd41070 R13: ffff88801fdd2028 R14: ffff88801c9fd818 R15: ffffffff8ac38340 FS: 0000000000000000(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000020000048 CR3: 000000007f5b2000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <TASK> j1939_xtp_rx_abort_one.cold+0x20b/0x33c net/can/j1939/transport.c:1340 j1939_xtp_rx_abort net/can/j1939/transport.c:1352 [inline] j1939_tp_cmd_recv net/can/j1939/transport.c:2100 [inline] j1939_tp_recv+0xb3d/0xcb0 net/can/j1939/transport.c:2133 j1939_can_recv+0x6ff/0x9a0 net/can/j1939/main.c:108 deliver net/can/af_can.c:574 [inline] can_rcv_filter+0x5d4/0x8d0 net/can/af_can.c:608 can_receive+0x31d/0x580 net/can/af_can.c:665 can_rcv+0x120/0x1c0 net/can/af_can.c:696 __netif_receive_skb_one_core+0x114/0x180 net/core/dev.c:5351 __netif_receive_skb+0x24/0x1b0 net/core/dev.c:5465 process_backlog+0x2a5/0x6c0 net/core/dev.c:5797 __napi_poll+0xb3/0x6e0 net/core/dev.c:6365 napi_poll net/core/dev.c:6432 [inline] net_rx_action+0x801/0xb40 net/core/dev.c:6519 __do_softirq+0x29b/0x9c2 kernel/softirq.c:558 run_ksoftirqd kernel/softirq.c:921 [inline] run_ksoftirqd+0x2d/0x60 kernel/softirq.c:913 smpboot_thread_fn+0x645/0x9c0 kernel/smpboot.c:164 kthread+0x2e9/0x3a0 kernel/kthread.c:377 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 </TASK> --- This report is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@xxxxxxxxxxxxxxxx. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. syzbot can test patches for this issue, for details see: https://goo.gl/tpsmEJ#testing-patches
