Date: Fri, 17 Jan 2014 11:49:18 +0800 From: Yang Yingliang <yangyingliang@huawei.com> To: Luigi Rizzo <rizzo@iet.unipi.it> Cc: freebsd-net@freebsd.org, dingtianhong@huawei.com Subject: BUG_ON triggered by igb driver in latest kernel Message-ID: <52D8A83E.5090201@huawei.com>
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Hi,
I use netmap with igb card in kernel 3.13-rc7, it triggered a bug_on.
The reason is that the patch "diff--igb--30b00--99999" remove the
napi_disable() in igb_down(). When netmap calls igb_up()->napi_enable(),
a bug_on is triggered.
-----------------------------------------------------------------------
Here is the calltrace:
PANIC: "kernel BUG at include/linux/netdevice.h:502!"
PID: 3200 TASK: ffff880069490410 CPU: 0 COMMAND: "pkt-gen"
#0 [ffff880069493a00] machine_kexec at ffffffff81033c1d
#1 [ffff880069493a50] crash_kexec at ffffffff810ad5a3
#2 [ffff880069493b20] oops_end at ffffffff81434650
#3 [ffff880069493b50] die at ffffffff81005716
#4 [ffff880069493b80] do_trap at ffffffff814341dc
#5 [ffff880069493bd0] do_invalid_op at ffffffff81003540
#6 [ffff880069493c70] invalid_op at ffffffff8143ace8
[exception RIP: igb_up+344]
RIP: ffffffffa030ed88 RSP: ffff880069493d28 RFLAGS: 00010246
RAX: 0000000000000000 RBX: ffff88007ac22840 RCX: 0000000000000000
RDX: ffff880037fbdc60 RSI: ffff88007ac22840 RDI: 0000000000000002
RBP: ffff880069493d38 R8: 0000000000000000 R9: 0000000000000006
R10: 000000000000000a R11: 0000000000000006 R12: ffff88007ac22000
R13: ffff8800377e7800 R14: ffff88007ac22840 R15: 0000000000000001
ORIG_RAX: ffffffffffffffff CS: 0010 SS: 0018
#7 [ffff880069493d20] igb_up at ffffffffa030ec41 [igb]
#8 [ffff880069493d40] igb_netmap_reg at ffffffffa030fa0d [igb]
#9 [ffff880069493d80] netmap_do_regif at ffffffffa02d3915 [netmap_lin]
#10 [ffff880069493dc0] linux_netmap_ioctl at ffffffffa02d4628 [netmap_lin]
#11 [ffff880069493eb0] do_vfs_ioctl at ffffffff81143d84
#12 [ffff880069493f30] sys_ioctl at ffffffff811442a1
#13 [ffff880069493f80] system_call_fastpath at ffffffff81439c62
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