Hello, syzbot found the following issue on: HEAD commit: fd0aa1a4 Merge tag 'for-linus' of git://git.kernel.org/pub.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=155c8d10300000 kernel config: https://syzkaller.appspot.com/x/.config?x=6ec2526c74098317 dashboard link: https://syzkaller.appspot.com/bug?extid=d56eaa979f1a3d6e2e2e syz repro: https://syzkaller.appspot.com/x/repro.syz?x=110912a4300000 IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+d56eaa979f1a3d6e2e2e@xxxxxxxxxxxxxxxxxxxxxxxxx BUG: memory leak unreferenced object 0xffff888126b3d500 (size 232): comm "softirq", pid 0, jiffies 4294974634 (age 13.120s) hex dump (first 32 bytes): 68 16 14 26 81 88 ff ff 68 16 14 26 81 88 ff ff h..&....h..&.... 00 80 5d 22 81 88 ff ff 00 00 00 00 00 00 00 00 ..]"............ backtrace: [<ffffffff836a0d5f>] __alloc_skb+0x20f/0x280 net/core/skbuff.c:413 [<ffffffff83c599e1>] alloc_skb include/linux/skbuff.h:1107 [inline] [<ffffffff83c599e1>] j1939_session_fresh_new net/can/j1939/transport.c:1484 [inline] [<ffffffff83c599e1>] j1939_xtp_rx_rts_session_new net/can/j1939/transport.c:1578 [inline] [<ffffffff83c599e1>] j1939_xtp_rx_rts+0x451/0xac0 net/can/j1939/transport.c:1679 [<ffffffff83c5a7eb>] j1939_tp_cmd_recv net/can/j1939/transport.c:1986 [inline] [<ffffffff83c5a7eb>] j1939_tp_recv+0x44b/0x640 net/can/j1939/transport.c:2067 [<ffffffff83c515dc>] j1939_can_recv+0x2bc/0x420 net/can/j1939/main.c:101 [<ffffffff83c43d98>] deliver net/can/af_can.c:574 [inline] [<ffffffff83c43d98>] can_rcv_filter+0xd8/0x290 net/can/af_can.c:608 [<ffffffff83c44360>] can_receive+0xf0/0x140 net/can/af_can.c:665 [<ffffffff83c4442d>] can_rcv+0x7d/0xf0 net/can/af_can.c:696 [<ffffffff836d2e1a>] __netif_receive_skb_one_core+0x6a/0xa0 net/core/dev.c:5459 [<ffffffff836d2ea7>] __netif_receive_skb+0x27/0xa0 net/core/dev.c:5573 [<ffffffff836d3234>] process_backlog+0xb4/0x1a0 net/core/dev.c:6437 [<ffffffff836d54fd>] __napi_poll+0x3d/0x2a0 net/core/dev.c:6985 [<ffffffff836d5cea>] napi_poll net/core/dev.c:7052 [inline] [<ffffffff836d5cea>] net_rx_action+0x32a/0x410 net/core/dev.c:7139 [<ffffffff846000bf>] __do_softirq+0xbf/0x2ab kernel/softirq.c:559 [<ffffffff81238a0c>] do_softirq kernel/softirq.c:460 [inline] [<ffffffff81238a0c>] do_softirq+0x5c/0x80 kernel/softirq.c:447 [<ffffffff81238a81>] __local_bh_enable_ip+0x51/0x60 kernel/softirq.c:384 [<ffffffff840bf0cd>] spin_unlock_bh include/linux/spinlock.h:399 [inline] [<ffffffff840bf0cd>] batadv_nc_purge_paths+0x19d/0x1f0 net/batman-adv/network-coding.c:467 BUG: memory leak unreferenced object 0xffff888126141600 (size 512): comm "softirq", pid 0, jiffies 4294974634 (age 13.120s) hex dump (first 32 bytes): 00 e0 9f 2a 81 88 ff ff 08 16 14 26 81 88 ff ff ...*.......&.... 08 16 14 26 81 88 ff ff 18 16 14 26 81 88 ff ff ...&.......&.... backtrace: [<ffffffff83c552eb>] kmalloc include/linux/slab.h:556 [inline] [<ffffffff83c552eb>] kzalloc include/linux/slab.h:686 [inline] [<ffffffff83c552eb>] j1939_session_new+0x5b/0x160 net/can/j1939/transport.c:1443 [<ffffffff83c59a78>] j1939_session_fresh_new net/can/j1939/transport.c:1495 [inline] [<ffffffff83c59a78>] j1939_xtp_rx_rts_session_new net/can/j1939/transport.c:1578 [inline] [<ffffffff83c59a78>] j1939_xtp_rx_rts+0x4e8/0xac0 net/can/j1939/transport.c:1679 [<ffffffff83c5a7eb>] j1939_tp_cmd_recv net/can/j1939/transport.c:1986 [inline] [<ffffffff83c5a7eb>] j1939_tp_recv+0x44b/0x640 net/can/j1939/transport.c:2067 [<ffffffff83c515dc>] j1939_can_recv+0x2bc/0x420 net/can/j1939/main.c:101 [<ffffffff83c43d98>] deliver net/can/af_can.c:574 [inline] [<ffffffff83c43d98>] can_rcv_filter+0xd8/0x290 net/can/af_can.c:608 [<ffffffff83c44360>] can_receive+0xf0/0x140 net/can/af_can.c:665 [<ffffffff83c4442d>] can_rcv+0x7d/0xf0 net/can/af_can.c:696 [<ffffffff836d2e1a>] __netif_receive_skb_one_core+0x6a/0xa0 net/core/dev.c:5459 [<ffffffff836d2ea7>] __netif_receive_skb+0x27/0xa0 net/core/dev.c:5573 [<ffffffff836d3234>] process_backlog+0xb4/0x1a0 net/core/dev.c:6437 [<ffffffff836d54fd>] __napi_poll+0x3d/0x2a0 net/core/dev.c:6985 [<ffffffff836d5cea>] napi_poll net/core/dev.c:7052 [inline] [<ffffffff836d5cea>] net_rx_action+0x32a/0x410 net/core/dev.c:7139 [<ffffffff846000bf>] __do_softirq+0xbf/0x2ab kernel/softirq.c:559 [<ffffffff81238a0c>] do_softirq kernel/softirq.c:460 [inline] [<ffffffff81238a0c>] do_softirq+0x5c/0x80 kernel/softirq.c:447 [<ffffffff81238a81>] __local_bh_enable_ip+0x51/0x60 kernel/softirq.c:384 [<ffffffff840bf0cd>] spin_unlock_bh include/linux/spinlock.h:399 [inline] [<ffffffff840bf0cd>] batadv_nc_purge_paths+0x19d/0x1f0 net/batman-adv/network-coding.c:467 BUG: memory leak unreferenced object 0xffff888126b3d300 (size 232): comm "softirq", pid 0, jiffies 4294974634 (age 13.120s) hex dump (first 32 bytes): 68 08 05 27 81 88 ff ff 68 08 05 27 81 88 ff ff h..'....h..'.... 00 00 0b 22 81 88 ff ff 00 00 00 00 00 00 00 00 ..."............ backtrace: [<ffffffff836a0d5f>] __alloc_skb+0x20f/0x280 net/core/skbuff.c:413 [<ffffffff83c599e1>] alloc_skb include/linux/skbuff.h:1107 [inline] [<ffffffff83c599e1>] j1939_session_fresh_new net/can/j1939/transport.c:1484 [inline] [<ffffffff83c599e1>] j1939_xtp_rx_rts_session_new net/can/j1939/transport.c:1578 [inline] [<ffffffff83c599e1>] j1939_xtp_rx_rts+0x451/0xac0 net/can/j1939/transport.c:1679 [<ffffffff83c5a7eb>] j1939_tp_cmd_recv net/can/j1939/transport.c:1986 [inline] [<ffffffff83c5a7eb>] j1939_tp_recv+0x44b/0x640 net/can/j1939/transport.c:2067 [<ffffffff83c515dc>] j1939_can_recv+0x2bc/0x420 net/can/j1939/main.c:101 [<ffffffff83c43d98>] deliver net/can/af_can.c:574 [inline] [<ffffffff83c43d98>] can_rcv_filter+0xd8/0x290 net/can/af_can.c:608 [<ffffffff83c44360>] can_receive+0xf0/0x140 net/can/af_can.c:665 [<ffffffff83c4442d>] can_rcv+0x7d/0xf0 net/can/af_can.c:696 [<ffffffff836d2e1a>] __netif_receive_skb_one_core+0x6a/0xa0 net/core/dev.c:5459 [<ffffffff836d2ea7>] __netif_receive_skb+0x27/0xa0 net/core/dev.c:5573 [<ffffffff836d3234>] process_backlog+0xb4/0x1a0 net/core/dev.c:6437 [<ffffffff836d54fd>] __napi_poll+0x3d/0x2a0 net/core/dev.c:6985 [<ffffffff836d5cea>] napi_poll net/core/dev.c:7052 [inline] [<ffffffff836d5cea>] net_rx_action+0x32a/0x410 net/core/dev.c:7139 [<ffffffff846000bf>] __do_softirq+0xbf/0x2ab kernel/softirq.c:559 [<ffffffff81238a0c>] do_softirq kernel/softirq.c:460 [inline] [<ffffffff81238a0c>] do_softirq+0x5c/0x80 kernel/softirq.c:447 [<ffffffff81238a81>] __local_bh_enable_ip+0x51/0x60 kernel/softirq.c:384 [<ffffffff840bf0cd>] spin_unlock_bh include/linux/spinlock.h:399 [inline] [<ffffffff840bf0cd>] batadv_nc_purge_paths+0x19d/0x1f0 net/batman-adv/network-coding.c:467 --- 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
