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Date: Mon, 18 Oct 2021 11:55:26 -0700
From: syzbot <syzbot+a6ec4dd9d38cb9261a77@...kaller.appspotmail.com>
To: davem@...emloft.net, kuba@...nel.org, linux-kernel@...r.kernel.org,
linux-usb@...r.kernel.org, netdev@...r.kernel.org,
syzkaller-bugs@...glegroups.com
Subject: [syzbot] divide error in genelink_tx_fixup
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@...kaller.appspotmail.com
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@...glegroups.com.
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
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