Hello, syzbot found the following issue on: HEAD commit: 660a92a59b9e usb: xhci: Enable runtime-pm by default on AM.. 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=1506ccf0b00000 kernel config: https://syzkaller.appspot.com/x/.config?x=5016916cdc0a4a84 dashboard link: https://syzkaller.appspot.com/bug?extid=a6ec4dd9d38cb9261a77 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=11308734b00000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=12f56f68b00000 IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+a6ec4dd9d38cb9261a77@xxxxxxxxxxxxxxxxxxxxxxxxx gl620a 2-1:0.0 usb1: register 'gl620a' at usb-dummy_hcd.1-1, Genesys GeneLink, 7a:f2:d1:89:41:da divide error: 0000 [#1] SMP KASAN CPU: 0 PID: 7 Comm: kworker/0:1 Not tainted 5.15.0-rc5-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: mld mld_ifc_work RIP: 0010:genelink_tx_fixup+0x308/0x610 drivers/net/usb/gl620a.c:172 Code: 8b 44 24 70 48 ba 00 00 00 00 00 fc ff df 48 89 f9 48 c1 e9 03 0f b6 14 11 84 d2 74 09 80 fa 03 0f 8e 50 02 00 00 31 d2 31 ff <f7> b3 28 01 00 00 41 89 d5 89 d6 e8 f8 50 b6 fd 45 85 ed 0f 84 b1 RSP: 0018:ffffc9000007f5e8 EFLAGS: 00010246 RAX: 0000000000000062 RBX: ffff8881197c0c00 RCX: 1ffff110232f81a5 RDX: 0000000000000000 RSI: ffffffff84bd1bb7 RDI: 0000000000000000 RBP: ffff88811b40b780 R08: 0000000000000000 R09: 0000000000000000 R10: ffffffff838b813c R11: 0000000000000000 R12: ffff88811b40b780 R13: 0000000000000654 R14: 000000000000005a R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff8881f6800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f09f3e0aff8 CR3: 000000011c54f000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: usbnet_start_xmit+0x152/0x1f70 drivers/net/usb/usbnet.c:1370 __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 faca6a933050247e ]--- RIP: 0010:genelink_tx_fixup+0x308/0x610 drivers/net/usb/gl620a.c:172 Code: 8b 44 24 70 48 ba 00 00 00 00 00 fc ff df 48 89 f9 48 c1 e9 03 0f b6 14 11 84 d2 74 09 80 fa 03 0f 8e 50 02 00 00 31 d2 31 ff <f7> b3 28 01 00 00 41 89 d5 89 d6 e8 f8 50 b6 fd 45 85 ed 0f 84 b1 RSP: 0018:ffffc9000007f5e8 EFLAGS: 00010246 RAX: 0000000000000062 RBX: ffff8881197c0c00 RCX: 1ffff110232f81a5 RDX: 0000000000000000 RSI: ffffffff84bd1bb7 RDI: 0000000000000000 RBP: ffff88811b40b780 R08: 0000000000000000 R09: 0000000000000000 R10: ffffffff838b813c R11: 0000000000000000 R12: ffff88811b40b780 R13: 0000000000000654 R14: 000000000000005a R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff8881f6800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f09f3e0aff8 CR3: 000000011c54f000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: 8b 44 24 70 mov 0x70(%rsp),%eax 4: 48 ba 00 00 00 00 00 movabs $0xdffffc0000000000,%rdx b: fc ff df e: 48 89 f9 mov %rdi,%rcx 11: 48 c1 e9 03 shr $0x3,%rcx 15: 0f b6 14 11 movzbl (%rcx,%rdx,1),%edx 19: 84 d2 test %dl,%dl 1b: 74 09 je 0x26 1d: 80 fa 03 cmp $0x3,%dl 20: 0f 8e 50 02 00 00 jle 0x276 26: 31 d2 xor %edx,%edx 28: 31 ff xor %edi,%edi * 2a: f7 b3 28 01 00 00 divl 0x128(%rbx) <-- trapping instruction 30: 41 89 d5 mov %edx,%r13d 33: 89 d6 mov %edx,%esi 35: e8 f8 50 b6 fd callq 0xfdb65132 3a: 45 85 ed test %r13d,%r13d 3d: 0f .byte 0xf 3e: 84 .byte 0x84 3f: b1 .byte 0xb1 --- 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
