We couldn't reproduce the bug and reporter cannot help in providing data, so
we're marking as invalid. If anybody ever reproduces that, please ping here and
reopen.
Thanks,
Guilherme
** Changed in: linux (Ubuntu)
Status: In Progress => Invalid
** Changed in: linux (Ubuntu Xenial)
** Tags added: cscc
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https://bugs.launchpad.net/bugs/1794877
Title:
Crash in ixgbe, during tx packet xmit (while potentially changing
queues number)
To manage notifications about
** Changed in: linux (Ubuntu Xenial)
Status: New => Confirmed
** Changed in: linux (Ubuntu)
Status: Confirmed => In Progress
** Changed in: linux (Ubuntu Xenial)
Assignee: (unassigned) => Guilherme G. Piccoli (gpiccoli)
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** Also affects: linux (Ubuntu Xenial)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1794877
Title:
Crash in ixgbe, during tx packet xmit (while
I was reading assembly and comparing with the code to evaluate the
accuracy of the registers during the dump, and also some points in which
it could has failed.
In the tx transmit function of ixgbe - ixgbe_xmit_frame(), we have the
following:
tx_ring = ring ? ring :
** Attachment added: "lspci_-nnvv.txt"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1794877/+attachment/5193804/+files/lspci_-nnvv.txt
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A preliminary analysis of the problem, based in a crash dump collected.
>From dmesg, we have
[28663.018356] BUG: unable to handle kernel NULL pointer dereference at
0058
[28663.026266] IP: [] ixgbe_xmit_frame_ring+0x81/0xf50
[ixgbe]
Using addr2line to validate the line in the
** Attachment added: "disassembly of relevant functions in crash"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1794877/+attachment/5193816/+files/ixgbe_xmit_ring.asm
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** Attachment added: "ethtool_-i_eth5.txt"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1794877/+attachment/5193805/+files/ethtool_-i_eth5.txt
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lspci -nn output for this adapter:
04:00.1 Ethernet controller [0200]: Intel Corporation 82599 10 Gigabit Dual
Port Backplane Connection [8086:10f8] (rev 01)
Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr-
Stepping- SERR- FastB2B- DisINTx+
Status: Cap+ 66MHz-
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