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[Bug 1425576] Re: Occasional crash in APM xgene enet driver on kernels prior to v3.19

To: kernel-packages@xxxxxxxxxxxxxxxxxxx
From: Joseph Salisbury <joseph.salisbury@xxxxxxxxxxxxx>
Date: Wed, 04 Mar 2015 18:38:04 -0000
Reply-to: Bug 1425576 <1425576@xxxxxxxxxxxxxxxxxx>
Sender: bounces@xxxxxxxxxxxxx
That test kernel should have upstream commit: 0b46b8a, which is the
following commit in Utopic:

commit e16bd2b7e29c5434505929deda4c6bb4436104d3
Author: Sonny Rao <sonnyrao@xxxxxxxxxxxx>
Date:   Sun Nov 23 23:02:44 2014 -0800

    clocksource: arch_timer: Fix code to use physical timers when
requested

git describe --contains e16bd2b
Ubuntu-3.16.0-31.41~254

Commit 0b46b8a was in mainline as of 3.19-rc1.  Vivid has since been
rebased to 3.19 final, so it will have the fix for the other bug.   I'll
apply the fix for this bug to a Vivid kernel and post it for testing.

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https://bugs.launchpad.net/bugs/1425576

Title:
  Occasional crash in APM xgene enet driver on kernels prior to v3.19

Status in linux package in Ubuntu:
  Triaged
Status in linux source package in Trusty:
  Triaged
Status in linux source package in Utopic:
  Triaged

Bug description:
  This crash was submitted upstream and a fix was already present, but
  it didn't land until the 3.19 kernel. This bug is to track getting
  that fix into trusty and utopic.

  Unable to handle kernel NULL pointer dereference at virtual address 000000c0
  pgd = ffffffc3e639a000
  [000000c0] *pgd=00000043e629d003, *pud=00000043e629d003, *pmd=0000000000000000
  Internal error: Oops: 96000006 [#1] PREEMPT SMP
  Modules linked in:
  CPU: 0 PID: 6643 Comm: qemu-system-aar Not tainted 3.19.0-rc7+ #254
  Hardware name: APM X-Gene Mustang board (DT)
  task: ffffffc3ee3aee00 ti: ffffffc3c044c000 task.ti: ffffffc3c044c000
  PC is at xgene_enet_process_ring+0x94/0x328
  LR is at xgene_enet_process_ring+0x78/0x328
  pc : [<ffffffc0003f9058>] lr : [<ffffffc0003f903c>] pstate: 80000145
  sp : ffffffc3c044fa00
  x29: ffffffc3c044fa00 x28: ffffffc0fe8aa218
  x27: 0000000000000000 x26: 0000000000000000
  x25: ffffffc3ee2b7000 x24: 0000000000000040
  x23: ffffffc0fe8aa418 x22: 00000000000001ff
  x21: 0000000000000001 x20: ffffffc0ff058380
  x19: 000000000000001c x18: 0000007f82d1c1f0
  x17: 0000007f84afbc90 x16: ffffffc0001a6a8c
  x15: 0000007f84b805a0 x14: 0000000000000000
  x13: 00000000d0d03820 x12: 0000000000000000
  x11: 0000000000000024 x10: 00000000d0d30a20
  x9 : ffffffc00031da28 x8 : ffffffbdc0000000
  x7 : ffffffc3cae0285e x6 : 00000040fec00000
  x5 : 0c08100801400148 x4 : 00000040ff000000
  x3 : 00020000000000d1 x2 : 0000000000000066
  x1 : 00000043cae0285e x0 : ffffffc3ee2bb818

  Process qemu-system-aar (pid: 6643, stack limit = 0xffffffc3c044c058)
  Stack: (0xffffffc3c044fa00 to 0xffffffc3c0450000)
  fa00: c044fa70 ffffffc3 003f93d0 ffffffc0 fe8aa290 ffffffc0 00000000 00000000
  fa20: 00000040 00000000 0078e000 ffffffc0 0016cac3 00000001 c044fb20 ffffffc3
  fa40: ff7d4000 00000003 007825c0 ffffffc0 0000012c 00000000 fff565c0 ffffffc3
  fa60: ffffffc0 00000000 ee2b7000 ffffffc3 c044faa0 ffffffc3 004a5cec ffffffc0
  fa80: fe8aa290 ffffffc0 00000000 00000000 00000040 00000000 84b805a0 0000007f
  faa0: c044fb40 ffffffc3 000b5da0 ffffffc0 c044c000 ffffffc3 0078e000 ffffffc0
  fac0: 0077faa0 ffffffc0 c044fb40 ffffffc3 00000018 00000000 00000101 00000000
  fae0: 00000003 00000000 0078e0c0 ffffffc0 0078e0d8 ffffffc0 00000000 00000000
  fb00: 00000008 00000000 006fbd90 ffffffc0 006fb9f0 ffffffc0 007e3d74 ffffffc0
  fb20: c044fb20 ffffffc3 c044fb20 ffffffc3 c044fb30 ffffffc3 c044fb30 ffffffc3
  fb40: c044fbc0 ffffffc3 000b6134 ffffffc0 00780000 ffffffc0 00000000 00000000
  fb60: 00000000 00000000 00002010 ffffff80 60000145 00000000 00000000 00000000
  fb80: 0000011a 00000000 0000001d 00000000 0079e000 ffffffc0 c044c000 ffffffc3
  fba0: 0000000a 00000000 0016cac2 00000001 00570c08 ffffffc0 084040c0 0000000a
  fbc0: c044fbe0 ffffffc3 000ecb2c ffffffc0 00780000 ffffffc0 000ecafc ffffffc0
  fbe0: c044fc20 ffffffc3 00082420 ffffffc0 00797000 ffffffc0 c044fc50 ffffffc3
  fc00: 0000200c ffffff80 000fc014 ffffffc0 ee010000 ffffffc3 000a253c 0000005c
  fc20: c044fd70 ffffffc3 00085da8 ffffffc0 00000000 00000000 fd024c90 ffffffc0
  fc40: c044fd70 ffffffc3 000d0938 ffffffc0 fd024c98 ffffffc0 ee3aee00 ffffffc3
  fc60: 00000000 00000000 00000000 00000000 0000ae80 00000000 00000000 00000000
  fc80: 00000000 00000000 c7e8ed00 5df42439 0000001d 00000000 00920000 00000000
  fca0: ffffffff 00000000 0000001b 00000000 00000000 00000000 00920000 00000000
  fcc0: 00000000 00000000 84b805a0 0000007f 001a6a8c ffffffc0 84afbc90 0000007f
  fce0: 82d1c1f0 0000007f 00000000 00000000 fd024c90 ffffffc0 00000000 00000000
  fd00: feabe300 ffffffc0 0000ae80 00000000 00000000 00000000 0000011a 00000000
  fd20: 0000001d 00000000 0079e000 ffffffc0 c044c000 ffffffc3 c044fd70 ffffffc3
  fd40: 0009c1d0 ffffffc0 c044fd70 ffffffc3 000d0938 ffffffc0 60000145 00000000
  fd60: c044fd70 ffffffc3 0009c1a4 ffffffc0 c044fda0 ffffffc3 0009c2e0 ffffffc0
  fd80: feabe300 ffffffc0 fd024c90 ffffffc0 0079e000 ffffffc0 c044c000 00000000
  fda0: c044fe10 ffffffc3 001a6824 ffffffc0 feabe300 ffffffc0 00000000 00000000
  fdc0: edc06f70 ffffffc3 0000000b 00000000 0000ae80 00000000 00000015 00000000
  fde0: 0000011a 00000000 00000040 0000ae80 c044fe20 ffffffc3 0019772c ffffffc0
  fe00: edb30000 ffffffc3 00000001 00000000 c044fe90 ffffffc3 001a6b10 ffffffc0
  fe20: 00000000 00000000 feabe301 ffffffc0 feabe300 ffffffc0 00000000 00000000
  fe40: c044fe70 ffffffc3 001b0a2c ffffffc0 00000000 00000000 ed3ea300 ffffffc3
  fe60: c044fe80 0000000b feabe300 ffffffc0 c044fe80 ffffffc3 001b0a80 ffffffc0
  fe80: c044fe90 ffffffc3 001a6acc ffffffc0 82d1c600 0000007f 00086430 ffffffc0
  fea0: 00000000 00000000 15b1cea0 00000000 ffffffff ffffffff 84afbc9c 0000007f
  fec0: 60000000 00000000 00000015 00000000 0000000b 00000000 0000ae80 00000000
  fee0: 00000000 00000000 ffffff80 00000000 82d1c700 0000007f 00000001 00000000
  ff00: 00000000 00000000 c7e8ed00 5df42439 0000001d 00000000 00920000 00000000
  ff20: ffffffff 00000000 0000001b 00000000 00000000 00000000 00920000 00000000
  ff40: 00000000 00000000 84b805a0 0000007f 008bc3d0 00000000 84afbc90 0000007f
  ff60: 82d1c1f0 0000007f 00920000 00000000 15b1cea0 00000000 00000000 00000000
  ff80: 00000001 00000000 84baa000 0000007f 82d1d090 0000007f 15b2512c 00000000
  ffa0: 837076f0 0000007f 00800000 00000000 84baf000 0000007f 82d1c600 0000007f
  ffc0: 004545a0 00000000 82d1c600 0000007f 84afbc9c 0000007f 60000000 00000000
  ffe0: 0000000b 00000000 0000001d 00000000 00000000 00000000 00000000 00000000
  Call trace:
  [<ffffffc0003f9058>] xgene_enet_process_ring+0x94/0x328
  [<ffffffc0003f93cc>] xgene_enet_napi+0x1c/0x54
  [<ffffffc0004a5ce8>] net_rx_action+0x1dc/0x2b8
  [<ffffffc0000b5d9c>] __do_softirq+0x100/0x220
  [<ffffffc0000b6130>] irq_exit+0x90/0xd0
  [<ffffffc0000ecb28>] __handle_domain_irq+0x60/0xac
  [<ffffffc00008241c>] gic_handle_irq+0x30/0x80
  Exception stack(0xffffffc3c044fc30 to 0xffffffc3c044fd50)
  fc20:                                     00000000 00000000 fd024c90 ffffffc0
  fc40: c044fd70 ffffffc3 000d0938 ffffffc0 fd024c98 ffffffc0 ee3aee00 ffffffc3
  fc60: 00000000 00000000 00000000 00000000 0000ae80 00000000 00000000 00000000
  fc80: 00000000 00000000 c7e8ed00 5df42439 0000001d 00000000 00920000 00000000
  fca0: ffffffff 00000000 0000001b 00000000 00000000 00000000 00920000 00000000
  fcc0: 00000000 00000000 84b805a0 0000007f 001a6a8c ffffffc0 84afbc90 0000007f
  fce0: 82d1c1f0 0000007f 00000000 00000000 fd024c90 ffffffc0 00000000 00000000
  fd00: feabe300 ffffffc0 0000ae80 00000000 00000000 00000000 0000011a 00000000
  fd20: 0000001d 00000000 0079e000 ffffffc0 c044c000 ffffffc3 c044fd70 ffffffc3
  fd40: 0009c1d0 ffffffc0 c044fd70 ffffffc3
  [<ffffffc000085da4>] el1_irq+0x64/0xd8
  [<ffffffc00009c2dc>] kvm_vcpu_ioctl+0x54/0x6f8
  [<ffffffc0001a6820>] do_vfs_ioctl+0x378/0x5e4
  [<ffffffc0001a6b0c>] SyS_ioctl+0x80/0x98
  Code: f1000b5f f863581b 54001348 79401e82 (f9406360)
  ---[ end trace 65548354a1e73544 ]---
  Kernel panic - not syncing: Fatal exception in interrupt
  CPU6: stopping
  CPU: 6 PID: 0 Comm: swapper/6 Tainted: G      D        3.19.0-rc7+ #254
  Hardware name: APM X-Gene Mustang board (DT)
  Call trace:
  [<ffffffc00008a01c>] dump_backtrace+0x0/0x124
  [<ffffffc00008a150>] show_stack+0x10/0x1c
  [<ffffffc00055f350>] dump_stack+0x80/0xc4
  [<ffffffc000092e74>] handle_IPI+0x184/0x194
  [<ffffffc000082464>] gic_handle_irq+0x78/0x80
  Exception stack(0xffffffc3ee16be40 to 0xffffffc3ee16bf60)
  be40: ee168000 ffffffc3 007945d0 ffffffc0 ee16bf80 ffffffc3 00087108 ffffffc0
  be60: 00000000 00000000 00000000 00000000 fffa1b1c ffffffc3 fffa1b1c ffffffc3
  be80: 00000020 00000000 0ccccccd 00000000 a7ea326e 002208f8 fffa1c88 ffffffc3
  bea0: ee14bc40 ffffffc3 ee16bd90 ffffffc3 54df86d6 00000000 0008d1b1 00000000
  bec0: 00000018 00000000 e8000000 00000003 00000000 00000000 37ea326e 0022731c
  bee0: 0010e164 ffffffc0 a9b20c84 0000007f dc507870 0000007f ee168000 ffffffc3
  bf00: 007945d0 ffffffc0 00794654 ffffffc0 00570920 ffffffc0 007e3beb ffffffc0
  bf20: 006b1598 ffffffc0 00816000 00000040 00818000 00000040 000826e0 ffffffc0
  bf40: 00000000 00000080 ee16bf80 ffffffc3 00087104 ffffffc0 ee16bf80 ffffffc3
  [<ffffffc000085da4>] el1_irq+0x64/0xd8
  [<ffffffc0000e3df4>] cpu_startup_entry+0xdc/0x12c
  [<ffffffc000092944>] secondary_start_kernel+0x114/0x124
  CPU2: stopping
  CPU: 2 PID: 0 Comm: swapper/2 Tainted: G      D        3.19.0-rc7+ #254
  Hardware name: APM X-Gene Mustang board (DT)
  Call trace:
  [<ffffffc00008a01c>] dump_backtrace+0x0/0x124
  [<ffffffc00008a150>] show_stack+0x10/0x1c
  [<ffffffc00055f350>] dump_stack+0x80/0xc4
  [<ffffffc000092e74>] handle_IPI+0x184/0x194
  [<ffffffc000082464>] gic_handle_irq+0x78/0x80
  Exception stack(0xffffffc3ee153e40 to 0xffffffc3ee153f60)
  3e40: ee150000 ffffffc3 007945d0 ffffffc0 ee153f80 ffffffc3 00087108 ffffffc0
  3e60: 00000000 00000000 00000000 00000000 fff6db1c ffffffc3 00000001 00000000
  3e80: 00000008 00000000 00000010 00000000 fff6e060 ffffffc3 fff6dc88 ffffffc3
  3ea0: ee149040 ffffffc3 ee153d90 ffffffc3 000003ff 00000000 b5193519 00000033
  3ec0: 56000000 00000000 00000000 00000000 00000000 00000000 98334438 0000007f
  3ee0: 440c0400 000000ff 00085000 ffffffc0 00000000 00000000 ee150000 ffffffc3
  3f00: 007945d0 ffffffc0 00794654 ffffffc0 00570920 ffffffc0 007e3beb ffffffc0
  3f20: 006b1598 ffffffc0 00816000 00000040 00818000 00000040 000826e0 ffffffc0
  3f40: 00000000 00000080 ee153f80 ffffffc3 00087104 ffffffc0 ee153f80 ffffffc3
  [<ffffffc000085da4>] el1_irq+0x64/0xd8
  [<ffffffc0000e3df4>] cpu_startup_entry+0xdc/0x12c
  [<ffffffc000092944>] secondary_start_kernel+0x114/0x124
  CPU4: stopping
  CPU: 4 PID: 0 Comm: swapper/4 Tainted: G      D        3.19.0-rc7+ #254
  Hardware name: APM X-Gene Mustang board (DT)
  Call trace:
  [<ffffffc00008a01c>] dump_backtrace+0x0/0x124
  [<ffffffc00008a150>] show_stack+0x10/0x1c
  [<ffffffc00055f350>] dump_stack+0x80/0xc4
  [<ffffffc000092e74>] handle_IPI+0x184/0x194
  [<ffffffc000082464>] gic_handle_irq+0x78/0x80
  Exception stack(0xffffffc3ee15be40 to 0xffffffc3ee15bf60)
  be40: ee158000 ffffffc3 007945d0 ffffffc0 ee15bf80 ffffffc3 00087108 ffffffc0
  be60: 00000000 00000000 00000000 00000000 fff87b1c ffffffc3 0046dda0 ffffffc0
  be80: 00000020 00000000 0ccccccd 00000000 a7ea326e 00364cf5 fff87c88 ffffffc3
  bea0: ee14a640 ffffffc3 ee15bd90 ffffffc3 000003ff 00000000 b5193519 00000033
  bec0: 56000000 00000000 00000000 00000000 00000000 00000000 0071eac8 00000000
  bee0: 440c0400 000000ff 00085000 ffffffc0 00000000 00000000 ee158000 ffffffc3
  bf00: 007945d0 ffffffc0 00794654 ffffffc0 00570920 ffffffc0 007e3beb ffffffc0
  bf20: 006b1598 ffffffc0 00816000 00000040 00818000 00000040 000826e0 ffffffc0
  bf40: 00000000 00000080 ee15bf80 ffffffc3 00087104 ffffffc0 ee15bf80 ffffffc3
  [<ffffffc000085da4>] el1_irq+0x64/0xd8
  [<ffffffc0000e3df4>] cpu_startup_entry+0xdc/0x12c
  [<ffffffc000092944>] secondary_start_kernel+0x114/0x124
  CPU5: stopping
  CPU: 5 PID: 0 Comm: swapper/5 Tainted: G      D        3.19.0-rc7+ #254
  Hardware name: APM X-Gene Mustang board (DT)
  Call trace:
  [<ffffffc00008a01c>] dump_backtrace+0x0/0x124
  [<ffffffc00008a150>] show_stack+0x10/0x1c
  [<ffffffc00055f350>] dump_stack+0x80/0xc4
  [<ffffffc000092e74>] handle_IPI+0x184/0x194
  [<ffffffc000082464>] gic_handle_irq+0x78/0x80
  Exception stack(0xffffffc3ee15fe40 to 0xffffffc3ee15ff60)
  fe40: ee15c000 ffffffc3 007945d0 ffffffc0 ee15ff80 ffffffc3 00087108 ffffffc0
  fe60: 00000000 00000000 00000000 00000000 fff94b1c ffffffc3 0046dda0 ffffffc0
  fe80: 00000020 00000000 0ccccccd 00000000 a7ea326e 00364cf5 fff94c88 ffffffc3
  fea0: ee14b140 ffffffc3 ee15fd90 ffffffc3 000003ff 00000000 b5193519 00000033
  fec0: 56000000 00000000 00000000 00000000 00000000 00000000 a4f652e0 0000007f
  fee0: 440c0400 000000ff 00085000 ffffffc0 00000000 00000000 ee15c000 ffffffc3
  ff00: 007945d0 ffffffc0 00794654 ffffffc0 00570920 ffffffc0 007e3beb ffffffc0
  ff20: 006b1598 ffffffc0 00816000 00000040 00818000 00000040 000826e0 ffffffc0
  ff40: 00000000 00000080 ee15ff80 ffffffc3 00087104 ffffffc0 ee15ff80 ffffffc3
  [<ffffffc000085da4>] el1_irq+0x64/0xd8
  [<ffffffc0000e3df4>] cpu_startup_entry+0xdc/0x12c
  [<ffffffc000092944>] secondary_start_kernel+0x114/0x124
  CPU1: stopping
  CPU: 1 PID: 0 Comm: swapper/1 Tainted: G      D        3.19.0-rc7+ #254
  Hardware name: APM X-Gene Mustang board (DT)
  Call trace:
  [<ffffffc00008a01c>] dump_backtrace+0x0/0x124
  [<ffffffc00008a150>] show_stack+0x10/0x1c
  [<ffffffc00055f350>] dump_stack+0x80/0xc4
  [<ffffffc000092e74>] handle_IPI+0x184/0x194
  [<ffffffc000082464>] gic_handle_irq+0x78/0x80
  Exception stack(0xffffffc3ee147e40 to 0xffffffc3ee147f60)
  7e40: ee144000 ffffffc3 007945d0 ffffffc0 ee147f80 ffffffc3 00087108 ffffffc0
  7e60: 00000000 00000000 00000000 00000000 fff60b1c ffffffc3 007a7840 ffffffc0
  7e80: ee147f00 ffffffc3 ff7e1000 00000003 27ea326e 003816b9 fff62798 ffffffc3
  7ea0: ee148540 ffffffc3 ee147d90 ffffffc3 54df86d6 00000000 000e84ba 00000000
  7ec0: 00000018 00000000 e8000000 00000003 00000000 00000000 97ea326e 0038b676
  7ee0: 0010e164 ffffffc0 86528280 0000007f 8525d920 0000007f ee144000 ffffffc3
  7f00: 007945d0 ffffffc0 00794654 ffffffc0 00570920 ffffffc0 007e3beb ffffffc0
  7f20: 006b1598 ffffffc0 00816000 00000040 00818000 00000040 000826e0 ffffffc0
  7f40: 00000000 00000080 ee147f80 ffffffc3 00087104 ffffffc0 ee147f80 ffffffc3
  [<ffffffc000085da4>] el1_irq+0x64/0xd8
  [<ffffffc0000e3df4>] cpu_startup_entry+0xdc/0x12c
  [<ffffffc000092944>] secondary_start_kernel+0x114/0x124
  CPU7: stopping
  CPU: 7 PID: 0 Comm: swapper/7 Tainted: G      D        3.19.0-rc7+ #254
  Hardware name: APM X-Gene Mustang board (DT)
  Call trace:
  [<ffffffc00008a01c>] dump_backtrace+0x0/0x124
  [<ffffffc00008a150>] show_stack+0x10/0x1c
  [<ffffffc00055f350>] dump_stack+0x80/0xc4
  [<ffffffc000092e74>] handle_IPI+0x184/0x194
  [<ffffffc000082464>] gic_handle_irq+0x78/0x80
  Exception stack(0xffffffc3ee16fe40 to 0xffffffc3ee16ff60)
  fe40: ee16c000 ffffffc3 007945d0 ffffffc0 ee16ff80 ffffffc3 00087108 ffffffc0
  fe60: 00000000 00000000 00000000 00000000 fffaeb1c ffffffc3 0046dda0 ffffffc0
  fe80: 00000020 00000000 0ccccccd 00000000 27ea326e 003816b9 fffaec88 ffffffc3
  fea0: ee14c740 ffffffc3 ee16fd90 ffffffc3 000003ff 00000000 00000005 00000000
  fec0: 005715fc ffffffc0 00000012 00000000 006ce888 ffffffc0 00000000 00000000
  fee0: 00000220 00000000 008bc420 00000000 87ffe440 0000007d ee16c000 ffffffc3
  ff00: 007945d0 ffffffc0 00794654 ffffffc0 00570920 ffffffc0 007e3beb ffffffc0
  ff20: 006b1598 ffffffc0 00816000 00000040 00818000 00000040 000826e0 ffffffc0
  ff40: 00000000 00000080 ee16ff80 ffffffc3 00087104 ffffffc0 ee16ff80 ffffffc3
  [<ffffffc000085da4>] el1_irq+0x64/0xd8
  [<ffffffc0000e3df4>] cpu_startup_entry+0xdc/0x12c
  [<ffffffc000092944>] secondary_start_kernel+0x114/0x124
  CPU3: stopping
  CPU: 3 PID: 0 Comm: swapper/3 Tainted: G      D        3.19.0-rc7+ #254
  Hardware name: APM X-Gene Mustang board (DT)
  Call trace:
  [<ffffffc00008a01c>] dump_backtrace+0x0/0x124
  [<ffffffc00008a150>] show_stack+0x10/0x1c
  [<ffffffc00055f350>] dump_stack+0x80/0xc4
  [<ffffffc000092e74>] handle_IPI+0x184/0x194
  [<ffffffc000082464>] gic_handle_irq+0x78/0x80
  Exception stack(0xffffffc3ee157e40 to 0xffffffc3ee157f60)
  7e40: ee154000 ffffffc3 007945d0 ffffffc0 ee157f80 ffffffc3 00087108 ffffffc0
  7e60: 00000000 00000000 00000000 00000000 fff7ab1c ffffffc3 0046dda0 ffffffc0
  7e80: 00000020 00000000 0ccccccd 00000000 27ea326e 001584a0 fff7ac88 ffffffc3
  7ea0: ee1dd038 ffffffc3 0000000b 00000000 00000000 00000000 00000040 00000000
  7ec0: 00000018 00000000 ab20b4ae ffffffff 84000000 002429ba 00000000 003b9aca
  7ee0: 001a8064 ffffffc0 ac9bc410 0000007f f9cdda11 00000000 ee154000 ffffffc3
  7f00: 007945d0 ffffffc0 00794654 ffffffc0 00570920 ffffffc0 007e3beb ffffffc0
  7f20: 006b1598 ffffffc0 00816000 00000040 00818000 00000040 000826e0 ffffffc0
  7f40: 00000000 00000080 ee157f80 ffffffc3 00087104 ffffffc0 ee157f80 ffffffc3
  [<ffffffc000085da4>] el1_irq+0x64/0xd8
  [<ffffffc0000e3df4>] cpu_startup_entry+0xdc/0x12c
  [<ffffffc000092944>] secondary_start_kernel+0x114/0x124
  ---[ end Kernel panic - not syncing: Fatal exception in interrupt

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References

[Bug 1425576] [NEW] Occasional crash in APM xgene enet driver on kernels prior to v3.19
From: Craig Magina, 2015-02-25