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[Eric Desrochers <eric.desrochers@xxxxxxxxxxxxx>]

** 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 potentially changing
  queues number)

Status in linux package in Ubuntu:
  In Progress
Status in linux source package in Xenial:
  Confirmed

Bug description:
  It was reported that ixgbe driver may crash with the following stack
  trace, while changing interrupt/queue configuration (probably using
  ethtool --set-channel):

  [28661.949147] init: irqbalance main process (19397) killed by TERM signal 
  [28662.381154] ixgbe 0000:04:00.0: removed PHC on eth4 
  [28662.502142] ixgbe 0000:04:00.0: Multiqueue Enabled: Rx Queue count = 18, Tx Queue count = 18 
  [28662.588634] ixgbe 0000:04:00.0: registered PHC device on eth4 
  [28662.689789] br-iscsi-left: port 1(eth4.4011) entered disabled state 
  [28662.689951] br-sio-bel: port 1(eth4.4015) entered disabled state 
  [28662.690039] br-sio-fel: port 1(eth4.4017) entered disabled state 
  [28662.694227] ixgbe 0000:04:00.0 eth4: NIC Link is Up 10 Gbps, Flow Control: RX/TX 
  [28662.694506] br-iscsi-left: port 1(eth4.4011) entered forwarding state 
  [28662.694519] br-iscsi-left: port 1(eth4.4011) entered forwarding state 
  [28662.694596] br-sio-bel: port 1(eth4.4015) entered forwarding state 
  [28662.694604] br-sio-bel: port 1(eth4.4015) entered forwarding state 
  [28662.694651] br-sio-fel: port 1(eth4.4017) entered forwarding state 
  [28662.694658] br-sio-fel: port 1(eth4.4017) entered forwarding state 
  [28662.709921] ixgbe 0000:04:00.1: removed PHC on eth5 
  [28662.834289] ixgbe 0000:04:00.1: Multiqueue Enabled: Rx Queue count = 18, Tx Queue count = 18 
  [28662.915121] ixgbe 0000:04:00.1: registered PHC device on eth5 
  [28663.018209] ixgbe 0000:04:00.1 eth5: NIC Link is Up 10 Gbps, Flow Control: RX/TX 
  [28663.018356] BUG: unable to handle kernel NULL pointer dereference at 0000000000000058 
  [28663.026266] IP: [<ffffffffc00ddb21>] ixgbe_xmit_frame_ring+0x81/0xf50 [ixgbe] 
  [28663.033491] PGD 8000000046bcc067 PUD 46bcd067 PMD 0 
  [28663.038562] Oops: 0000 [#1] SMP 
  [28663.328921] Call Trace: 
  [28663.334598] <IRQ> 
  [28663.336551] [<ffffffffc00dea32>] ixgbe_xmit_frame+0x42/0x90 [ixgbe] 
  [28663.349627] [<ffffffff8171532d>] dev_hard_start_xmit+0x23d/0x400 
  [28663.358854] [<ffffffff81739d44>] sch_direct_xmit+0xe4/0x1f0 
  [28663.367602] [<ffffffff81739eeb>] __qdisc_run+0x9b/0x1c0 
  [28663.376110] [<ffffffff8171220e>] net_tx_action+0x15e/0x240 
  [28663.384673] [<ffffffff81084fb6>] __do_softirq+0xe6/0x2a0 
  [28663.392944] [<ffffffff81085395>] irq_exit+0x95/0xa0 
  [28663.400720] [<ffffffff8181d0f6>] do_IRQ+0x56/0xe0 
  [28663.408338] [<ffffffff8181a77f>] common_interrupt+0xbf/0xbf 
  [28663.416733] <EOI> 
  [28663.418680] [<ffffffff810998dc>] ? worker_thread+0x18c/0x480 
  [28663.430363] [<ffffffff81099750>] ? rescuer_thread+0x310/0x310 
  [28663.438870] [<ffffffff8109f138>] kthread+0xd8/0xf0 
  [28663.446368] [<ffffffff8109f060>] ? kthread_park+0x60/0x60 
  [28663.454385] [<ffffffff81819ff5>] ret_from_fork+0x55/0x80 
  [28663.462286] [<ffffffff8109f060>] ? kthread_park+0x60/0x60 
  [28663.470488] Code: 2a 41 83 e8 01 31 c0 45 0f b7 c0 49 83 c0 01 49 c1 e0 04 8b 74 07 3c 48 83 c0 10 8d 96 ff 3f 00 00 c1 ea 0e 01 d1 4c 39 c0 75 e8 <0f> b7 43 58 0f b7 73 5a 83 c1 03 31 d2 66 39 f0 66 0f 43 53 54 
  [28663.498992] RIP [<ffffffffc00ddb21>] ixgbe_xmit_frame_ring+0x81/0xf50 [ixgbe] 
  [28663.512112] RSP <ffff88103f283d20> 
  [28663.518217] CR2: 0000000000000058

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