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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: dann frazier <dann.frazier@xxxxxxxxxxxxx>
Date: Thu, 18 Jun 2015 14:40:59 -0000
Reply-to: Bug 1425576 <1425576@xxxxxxxxxxxxxxxxxx>
Sender: bounces@xxxxxxxxxxxxx
** Description changed:

- 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.
+ [Impact]
+ System panics every few hours under constant network load
  
- 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
+ [Test Case]
+ On the X-Gene system, start an iperf server:
+   $ iperf -s
+ Connect to it from another system (1Gbps is sufficient)
+   $ iperf -t 100000 -c <xgene host>
  
- 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
+ On failure, you'll get a panic within several hours.
+ 
+ [Regression Risk]
+ The proposed patch only touches the impacted driver. It is adding a memory barrier - albeit a lightweight one - so there is the risk of a performance degradation. Indeed, when measured using a 60s iperf run, I do see a performance drop, but by < 0.5%.

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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:
  In Progress
Status in linux source package in Utopic:
  In Progress

Bug description:
  [Impact]
  System panics every few hours under constant network load

  [Test Case]
  On the X-Gene system, start an iperf server:
    $ iperf -s
  Connect to it from another system (1Gbps is sufficient)
    $ iperf -t 100000 -c <xgene host>

  On failure, you'll get a panic within several hours.

  [Regression Risk]
  The proposed patch only touches the impacted driver. It is adding a memory barrier - albeit a lightweight one - so there is the risk of a performance degradation. Indeed, when measured using a 60s iperf run, I do see a performance drop, but by < 0.5%.

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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