Hello, syzbot found the following issue on: HEAD commit: c03fb16bafdf Merge 5.15-rc6 into usb-next git tree: https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git usb-testing console output: https://syzkaller.appspot.com/x/log.txt?x=12d48f1f300000 kernel config: https://syzkaller.appspot.com/x/.config?x=c27d285bdb7457e2 dashboard link: https://syzkaller.appspot.com/bug?extid=76bb1d34ffa0adc03baa 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=14fe6decb00000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=15c7bcaf300000 IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+76bb1d34ffa0adc03baa@xxxxxxxxxxxxxxxxxxxxxxxxx divide error: 0000 [#1] SMP KASAN CPU: 0 PID: 1315 Comm: kworker/0:6 Not tainted 5.15.0-rc6-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: mld mld_ifc_work RIP: 0010:usbnet_start_xmit+0x3f1/0x1f70 drivers/net/usb/usbnet.c:1404 Code: 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 0f b6 04 02 84 c0 74 08 3c 03 0f 8e 4b 18 00 00 8b 44 24 08 31 d2 31 ff <41> f7 b5 28 0d 00 00 41 89 d4 89 d6 e8 4e 12 b5 fd 45 85 e4 0f 84 RSP: 0018:ffffc9000104f660 EFLAGS: 00010246 RAX: 000000000000005a RBX: 0000000000000000 RCX: 0000000000000000 RDX: 0000000000000000 RSI: ffffffff838cbdc1 RDI: 0000000000000000 RBP: ffff8881155b1350 R08: 0000000000000001 R09: 0000000000000000 R10: ffffffff838cbdb4 R11: 0000000000000000 R12: 00000000c0011100 R13: ffff888119304000 R14: ffff8881155b1280 R15: ffff8881155b0d00 FS: 0000000000000000(0000) GS:ffff8881f6800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f24d7edaa70 CR3: 000000010a45d000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __netdev_start_xmit include/linux/netdevice.h:4988 [inline] netdev_start_xmit include/linux/netdevice.h:5002 [inline] xmit_one net/core/dev.c:3576 [inline] dev_hard_start_xmit+0x1df/0x890 net/core/dev.c:3592 sch_direct_xmit+0x25b/0x790 net/sched/sch_generic.c:342 __dev_xmit_skb net/core/dev.c:3803 [inline] __dev_queue_xmit+0xf25/0x2d40 net/core/dev.c:4170 neigh_resolve_output net/core/neighbour.c:1492 [inline] neigh_resolve_output+0x50e/0x820 net/core/neighbour.c:1472 neigh_output include/net/neighbour.h:510 [inline] ip6_finish_output2+0xdbe/0x1b20 net/ipv6/ip6_output.c:126 __ip6_finish_output.part.0+0x387/0xbb0 net/ipv6/ip6_output.c:191 __ip6_finish_output include/linux/skbuff.h:982 [inline] ip6_finish_output net/ipv6/ip6_output.c:201 [inline] NF_HOOK_COND include/linux/netfilter.h:296 [inline] ip6_output+0x3d2/0x810 net/ipv6/ip6_output.c:224 dst_output include/net/dst.h:450 [inline] NF_HOOK include/linux/netfilter.h:307 [inline] NF_HOOK include/linux/netfilter.h:301 [inline] mld_sendpack+0x979/0xe10 net/ipv6/mcast.c:1826 mld_send_cr net/ipv6/mcast.c:2127 [inline] mld_ifc_work+0x71c/0xdc0 net/ipv6/mcast.c:2659 process_one_work+0x9bf/0x1620 kernel/workqueue.c:2297 worker_thread+0x658/0x11f0 kernel/workqueue.c:2444 kthread+0x3c2/0x4a0 kernel/kthread.c:319 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 Modules linked in: ---[ end trace 3c734ee50b55655e ]--- RIP: 0010:usbnet_start_xmit+0x3f1/0x1f70 drivers/net/usb/usbnet.c:1404 Code: 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 0f b6 04 02 84 c0 74 08 3c 03 0f 8e 4b 18 00 00 8b 44 24 08 31 d2 31 ff <41> f7 b5 28 0d 00 00 41 89 d4 89 d6 e8 4e 12 b5 fd 45 85 e4 0f 84 RSP: 0018:ffffc9000104f660 EFLAGS: 00010246 RAX: 000000000000005a RBX: 0000000000000000 RCX: 0000000000000000 RDX: 0000000000000000 RSI: ffffffff838cbdc1 RDI: 0000000000000000 RBP: ffff8881155b1350 R08: 0000000000000001 R09: 0000000000000000 R10: ffffffff838cbdb4 R11: 0000000000000000 R12: 00000000c0011100 R13: ffff888119304000 R14: ffff8881155b1280 R15: ffff8881155b0d00 FS: 0000000000000000(0000) GS:ffff8881f6800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f24d7edaa70 CR3: 000000010a45d000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess), 1 bytes skipped: 0: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax 7: fc ff df a: 48 89 fa mov %rdi,%rdx d: 48 c1 ea 03 shr $0x3,%rdx 11: 0f b6 04 02 movzbl (%rdx,%rax,1),%eax 15: 84 c0 test %al,%al 17: 74 08 je 0x21 19: 3c 03 cmp $0x3,%al 1b: 0f 8e 4b 18 00 00 jle 0x186c 21: 8b 44 24 08 mov 0x8(%rsp),%eax 25: 31 d2 xor %edx,%edx 27: 31 ff xor %edi,%edi * 29: 41 f7 b5 28 0d 00 00 divl 0xd28(%r13) <-- trapping instruction 30: 41 89 d4 mov %edx,%r12d 33: 89 d6 mov %edx,%esi 35: e8 4e 12 b5 fd callq 0xfdb51288 3a: 45 85 e4 test %r12d,%r12d 3d: 0f .byte 0xf 3e: 84 .byte 0x84 --- 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