kernel-packages team mailing list archive

[dann frazier <dann.frazier@xxxxxxxxxxxxx>]

** Description changed:

- While building coreutils on trusty with the testsuite enabled, we hit
- the following panic reproducibly on our Mustang buildds:
+ [Impact]
+ The kernel crashes when building coreutils on arm64, impacting the Ubuntu buildds. Also maybe considered a local DoS, as it can be used by a local non-privileged user to crash a system.
  
- [  715.969679] Kernel panic - not syncing: BUG!
- [  715.973930] CPU: 1 PID: 10872 Comm: bash Not tainted 3.13.0-57-generic #95-Ubuntu
- [  715.981373] Call trace:
- [  715.983811] [<ffffffc00008848c>] dump_backtrace+0x0/0x16c
- [  715.989182] [<ffffffc000088608>] show_stack+0x10/0x1c
- [  715.994208] [<ffffffc00060c660>] dump_stack+0x74/0x94
- [  715.999232] [<ffffffc000606864>] panic+0xe0/0x20c
- [  716.003911] [<ffffffc00017792c>] __get_user_pages+0x300/0x4ec
- [  716.009625] [<ffffffc000177b58>] get_user_pages+0x40/0x4c
- [  716.014996] [<ffffffc0001ad6d0>] get_arg_page+0x44/0xb8
- [  716.020193] [<ffffffc0001ae0e0>] copy_strings.isra.21+0x148/0x268
- [  716.026254] [<ffffffc0001aee90>] do_execve_common.isra.25+0x3fc/0x5b4
- [  716.032661] [<ffffffc0001af064>] do_execve+0x1c/0x28
- [  716.037599] [<ffffffc0001af2c0>] SyS_execve+0x34/0x54
- [  716.042624] CPU0: stopping
- [  716.045317] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 3.13.0-57-generic #95-Ubuntu
- [  716.052846] Call trace:
- [  716.055280] [<ffffffc00008848c>] dump_backtrace+0x0/0x16c
- [  716.060650] [<ffffffc000088608>] show_stack+0x10/0x1c
- [  716.065674] [<ffffffc00060c660>] dump_stack+0x74/0x94
- [  716.070699] [<ffffffc00008ed3c>] handle_IPI+0x120/0x138
- [  716.075895] [<ffffffc0000812cc>] gic_handle_irq+0x74/0x7c
- [  716.081264] Exception stack(0xffffffc0008efde0 to 0xffffffc0008eff00)
- [  716.087672] fde0: 008ec000 ffffffc0 008ec000 ffffffc0 008eff20 ffffffc0 00085600 ffffffc0
- [  716.095808] fe00: 0005ae0c 00000000 00000000 00000000 fff80834 ffffffc3 0000a281 00000001
- [  716.103942] fe20: 00000020 00000000 00000010 00000000 b9191580 000000a6 fff80df0 ffffffc3
- [  716.112077] fe40: 008f8e80 ffffffc0 008efd20 ffffffc0 0000a281 00000001 00000000 00000000
- [  716.120211] fe60: 0000002d 00000000 004ed968 00000000 004ed000 00000000 ffffffff ffffffff
- [  716.128345] fe80: 001af28c ffffffc0 004e2488 00000000 f00fad90 0000007f 008ec000 ffffffc0
- [  716.136479] fea0: 008ec000 ffffffc0 00972000 ffffffc0 0098ac78 ffffffc0 00980198 ffffffc0
- [  716.144613] fec0: 008ec000 ffffffc0 00971233 ffffffc0 0007d000 00000040 007d2890 ffffffc0
- [  716.152749] fee0: 0061cd98 ffffffc0 008eff20 ffffffc0 000855fc ffffffc0 008eff20 ffffffc0
- [  716.160883] [<ffffffc0000845a8>] el1_irq+0x68/0xc0
- [  716.165648] [<ffffffc0000ed6e4>] cpu_startup_entry+0x12c/0x1e4
- [  716.171451] [<ffffffc000603958>] rest_init+0x6c/0x78
- [  716.176390] [<ffffffc00089d7e4>] start_kernel+0x350/0x368
- [  716.181760] CPU7: stopping
- [  716.184455] CPU: 7 PID: 0 Comm: swapper/7 Not tainted 3.13.0-57-generic #95-Ubuntu
- [  716.191985] Call trace:
- [  716.194420] [<ffffffc00008848c>] dump_backtrace+0x0/0x16c
- [  716.199791] [<ffffffc000088608>] show_stack+0x10/0x1c
- [  716.204815] [<ffffffc00060c660>] dump_stack+0x74/0x94
- [  716.209840] [<ffffffc00008ed3c>] handle_IPI+0x120/0x138
- [  716.215036] [<ffffffc0000812cc>] gic_handle_irq+0x74/0x7c
- [  716.220405] Exception stack(0xffffffc3ec19be20 to 0xffffffc3ec19bf40)
- [  716.226812] be20: ec198000 ffffffc3 ec198000 ffffffc3 ec19bf60 ffffffc3 00085600 ffffffc0
- [  716.234946] be40: 0003bdee 00000000 00000000 00000000 fffcd834 ffffffc3 0000a281 00000001
- [  716.243081] be60: 00000000 00000000 ff6e5000 00000003 00906140 ffffffc0 00000400 00000000
- [  716.251215] be80: ec183c10 ffffffc3 ec19bd60 ffffffc3 0000a282 00000001 00000000 00000000
- [  716.259350] bea0: 00000001 00000000 f00faf10 0000007f 0043a548 00000000 ffffffff ffffffff
- [  716.267484] bec0: 000a92f8 ffffffc0 00115920 00000020 f00fad10 0000007f ec198000 ffffffc3
- [  716.275618] bee0: ec198000 ffffffc3 00972000 ffffffc0 0098ac78 ffffffc0 00980198 ffffffc0
- [  716.283752] bf00: ec198000 ffffffc3 00971233 ffffffc0 0007d000 00000040 007d2890 ffffffc0
- [  716.291886] bf20: 0061cd98 ffffffc0 ec19bf60 ffffffc3 000855fc ffffffc0 ec19bf60 ffffffc3
- [  716.300020] [<ffffffc0000845a8>] el1_irq+0x68/0xc0
- [  716.304785] [<ffffffc0000ed6e4>] cpu_startup_entry+0x12c/0x1e4
- [  716.310587] [<ffffffc00008e8b8>] secondary_start_kernel+0xf8/0x108
- [  716.316734] CPU6: stopping
- [  716.319427] CPU: 6 PID: 0 Comm: swapper/6 Not tainted 3.13.0-57-generic #95-Ubuntu
- [  716.326956] Call trace:
- [  716.329390] [<ffffffc00008848c>] dump_backtrace+0x0/0x16c
- [  716.334760] [<ffffffc000088608>] show_stack+0x10/0x1c
- [  716.339784] [<ffffffc00060c660>] dump_stack+0x74/0x94
- [  716.344808] [<ffffffc00008ed3c>] handle_IPI+0x120/0x138
- [  716.350004] [<ffffffc0000812cc>] gic_handle_irq+0x74/0x7c
- [  716.355374] Exception stack(0xffffffc3ec197e20 to 0xffffffc3ec197f40)
- [  716.361781] 7e20: ec194000 ffffffc3 ec194000 ffffffc3 ec197f60 ffffffc3 00085600 ffffffc0
- [  716.369915] 7e40: 0003b8ac 00000000 00000000 00000000 fffc2834 ffffffc3 0000a281 00000001
- [  716.378049] 7e60: 00000020 00000000 00000010 00000000 b9191580 000000a6 fffc2df0 ffffffc3
- [  716.386184] 7e80: ec183110 ffffffc3 ec197d60 ffffffc3 0000a281 00000001 00000000 00000000
- [  716.394318] 7ea0: 0001569d 00000000 f00fb230 0000007f 0043a548 00000000 00000000 00000000
- [  716.402453] 7ec0: 000a92f8 ffffffc0 00115920 00000020 f00f9350 0000007f ec194000 ffffffc3
- [  716.410587] 7ee0: ec194000 ffffffc3 00972000 ffffffc0 0098ac78 ffffffc0 00980198 ffffffc0
- [  716.418721] 7f00: ec194000 ffffffc3 00971233 ffffffc0 0007d000 00000040 007d2890 ffffffc0
- [  716.426855] 7f20: 0061cd98 ffffffc0 ec197f60 ffffffc3 000855fc ffffffc0 ec197f60 ffffffc3
- [  716.434989] [<ffffffc0000845a8>] el1_irq+0x68/0xc0
- [  716.439754] [<ffffffc0000ed6e4>] cpu_startup_entry+0x12c/0x1e4
- [  716.445555] [<ffffffc00008e8b8>] secondary_start_kernel+0xf8/0x108
- [  716.451703] CPU5: stopping
- [  716.454398] CPU: 5 PID: 0 Comm: swapper/5 Not tainted 3.13.0-57-generic #95-Ubuntu
- [  716.461928] Call trace:
- [  716.464363] [<ffffffc00008848c>] dump_backtrace+0x0/0x16c
- [  716.469734] [<ffffffc000088608>] show_stack+0x10/0x1c
- [  716.474759] [<ffffffc00060c660>] dump_stack+0x74/0x94
- [  716.479782] [<ffffffc00008ed3c>] handle_IPI+0x120/0x138
- [  716.484979] [<ffffffc0000812cc>] gic_handle_irq+0x74/0x7c
- [  716.490348] Exception stack(0xffffffc3ec193e20 to 0xffffffc3ec193f40)
- [  716.496755] 3e20: ec190000 ffffffc3 ec190000 ffffffc3 ec193f60 ffffffc3 00085600 ffffffc0
- [  716.504891] 3e40: 0002ccb8 00000000 00000000 00000000 fffb7834 ffffffc3 0000a281 00000001
- [  716.513025] 3e60: 00000020 00000000 00000010 00000000 26c54180 000000a7 fffb7df0 ffffffc3
- [  716.521159] 3e80: ec182610 ffffffc3 ec193d60 ffffffc3 0000a279 00000001 00000000 00000000
- [  716.529293] 3ea0: 00000020 00000000 00000018 00000000 ffffffff ffffffff ffffffff ffffffff
- [  716.537427] 3ec0: 001af28c ffffffc0 004e2488 00000000 dfb530d0 0000007f ec190000 ffffffc3
- [  716.545562] 3ee0: ec190000 ffffffc3 00972000 ffffffc0 0098ac78 ffffffc0 00980198 ffffffc0
- [  716.553696] 3f00: ec190000 ffffffc3 00971233 ffffffc0 0007d000 00000040 007d2890 ffffffc0
- [  716.561830] 3f20: 0061cd98 ffffffc0 ec193f60 ffffffc3 000855fc ffffffc0 ec193f60 ffffffc3
- [  716.569963] [<ffffffc0000845a8>] el1_irq+0x68/0xc0
- [  716.574728] [<ffffffc0000ed6e4>] cpu_startup_entry+0x12c/0x1e4
- [  716.580530] [<ffffffc00008e8b8>] secondary_start_kernel+0xf8/0x108
- [  716.586678] CPU2: stopping
- [  716.589373] CPU: 2 PID: 0 Comm: swapper/2 Not tainted 3.13.0-57-generic #95-Ubuntu
- [  716.596903] Call trace:
- [  716.599338] [<ffffffc00008848c>] dump_backtrace+0x0/0x16c
- [  716.604708] [<ffffffc000088608>] show_stack+0x10/0x1c
- [  716.609733] [<ffffffc00060c660>] dump_stack+0x74/0x94
- [  716.614757] [<ffffffc00008ed3c>] handle_IPI+0x120/0x138
- [  716.619953] [<ffffffc0000812cc>] gic_handle_irq+0x74/0x7c
- [  716.625322] Exception stack(0xffffffc3ec17fe20 to 0xffffffc3ec17ff40)
- [  716.631729] fe20: ec17c000 ffffffc3 ec17c000 ffffffc3 ec17ff60 ffffffc3 00085600 ffffffc0
- [  716.639864] fe40: 00032872 00000000 00000000 00000000 fff96834 ffffffc3 0000a281 00000001
- [  716.647998] fe60: 00000020 00000000 00000010 00000000 b9191580 000000a6 fff96df0 ffffffc3
- [  716.656132] fe80: ec180510 ffffffc3 ec17fd60 ffffffc3 0000a281 00000001 00000000 00000000
- [  716.664266] fea0: 0001ec9b 00000000 00000040 00000000 004eb000 00000000 ffffffff ffffffff
- [  716.672400] fec0: 001af28c ffffffc0 004e2488 00000000 f00f7d10 0000007f ec17c000 ffffffc3
- [  716.680535] fee0: ec17c000 ffffffc3 00972000 ffffffc0 0098ac78 ffffffc0 00980198 ffffffc0
- [  716.688669] ff00: ec17c000 ffffffc3 00971233 ffffffc0 0007d000 00000040 007d2890 ffffffc0
- [  716.696804] ff20: 0061cd98 ffffffc0 ec17ff60 ffffffc3 000855fc ffffffc0 ec17ff60 ffffffc3
- [  716.704939] [<ffffffc0000845a8>] el1_irq+0x68/0xc0
- [  716.709704] [<ffffffc0000ed6e4>] cpu_startup_entry+0x12c/0x1e4
- [  716.715506] [<ffffffc00008e8b8>] secondary_start_kernel+0xf8/0x108
- [  716.721653] CPU3: stopping
- [  716.724345] CPU: 3 PID: 0 Comm: swapper/3 Not tainted 3.13.0-57-generic #95-Ubuntu
- [  716.731874] Call trace:
- [  716.734308] [<ffffffc00008848c>] dump_backtrace+0x0/0x16c
- [  716.739679] [<ffffffc000088608>] show_stack+0x10/0x1c
- [  716.744703] [<ffffffc00060c660>] dump_stack+0x74/0x94
- [  716.749727] [<ffffffc00008ed3c>] handle_IPI+0x120/0x138
- [  716.754923] [<ffffffc0000812cc>] gic_handle_irq+0x74/0x7c
- [  716.760292] Exception stack(0xffffffc3ec18be20 to 0xffffffc3ec18bf40)
- [  716.766699] be20: ec188000 ffffffc3 ec188000 ffffffc3 ec18bf60 ffffffc3 00085600 ffffffc0
- [  716.774834] be40: 00039a32 00000000 00000000 00000000 fffa1834 ffffffc3 0000a281 00000001
- [  716.782968] be60: 00000000 00000000 fffa1c90 ffffffc3 b9191580 000000a6 e772fd48 ffffffc3
- [  716.791103] be80: ec181010 ffffffc3 ec18bd60 ffffffc3 0000a27a 00000001 00000000 00000000
- [  716.799237] bea0: 00000018 00000000 e8000000 00000003 00000000 00000000 d3fef76e 0021ced1
- [  716.807373] bec0: 001ef6a4 ffffffc0 b55e6360 0000007f a3ffe560 0000007f ec188000 ffffffc3
- [  716.815507] bee0: ec188000 ffffffc3 00972000 ffffffc0 0098ac78 ffffffc0 00980198 ffffffc0
- [  716.823642] bf00: ec188000 ffffffc3 00971233 ffffffc0 0007d000 00000040 007d2890 ffffffc0
- [  716.831776] bf20: 0061cd98 ffffffc0 ec18bf60 ffffffc3 000855fc ffffffc0 ec18bf60 ffffffc3
- [  716.839911] [<ffffffc0000845a8>] el1_irq+0x68/0xc0
- [  716.844675] [<ffffffc0000ed6e4>] cpu_startup_entry+0x12c/0x1e4
- [  716.850477] [<ffffffc00008e8b8>] secondary_start_kernel+0xf8/0x108
- [  716.856624] CPU4: stopping
- [  716.859317] CPU: 4 PID: 0 Comm: swapper/4 Not tainted 3.13.0-57-generic #95-Ubuntu
- [  716.866846] Call trace:
- [  716.869280] [<ffffffc00008848c>] dump_backtrace+0x0/0x16c
- [  716.874651] [<ffffffc000088608>] show_stack+0x10/0x1c
- [  716.879675] [<ffffffc00060c660>] dump_stack+0x74/0x94
- [  716.884699] [<ffffffc00008ed3c>] handle_IPI+0x120/0x138
- [  716.889895] [<ffffffc0000812cc>] gic_handle_irq+0x74/0x7c
- [  716.895264] Exception stack(0xffffffc3ec18fe20 to 0xffffffc3ec18ff40)
- [  716.901671] fe20: ec18c000 ffffffc3 ec18c000 ffffffc3 ec18ff60 ffffffc3 00085600 ffffffc0
- [  716.909807] fe40: 00032884 00000000 00000000 00000000 fffac834 ffffffc3 0000a281 00000001
- [  716.917941] fe60: 00000020 00000000 00000010 00000000 b9191580 000000a6 00984d18 ffffffc0
- [  716.926075] fe80: ec181b10 ffffffc3 ec18fd60 ffffffc3 00000400 00000000 00000000 00000000
- [  716.934210] fea0: 00012314 00000000 dfb53250 0000007f 0043a548 00000000 ffffffff ffffffff
- [  716.942344] fec0: 000a92f8 ffffffc0 00115920 00000020 dfb51c30 0000007f ec18c000 ffffffc3
- [  716.950478] fee0: ec18c000 ffffffc3 00972000 ffffffc0 0098ac78 ffffffc0 00980198 ffffffc0
- [  716.958612] ff00: ec18c000 ffffffc3 00971233 ffffffc0 0007d000 00000040 007d2890 ffffffc0
- [  716.966747] ff20: 0061cd98 ffffffc0 ec18ff60 ffffffc3 000855fc ffffffc0 ec18ff60 ffffffc3
- [  716.974882] [<ffffffc0000845a8>] el1_irq+0x68/0xc0
- [  716.979647] [<ffffffc0000ed6e4>] cpu_startup_entry+0x12c/0x1e4
- [  716.985449] [<ffffffc00008e8b8>] secondary_start_kernel+0xf8/0x108
+ [Test Case]
+ Build the Ubuntu coreutils package w/ tests enabled (the default) on an arm64 system.
+ 
+ [Regression Risk]
+ I'm no expert in this code, but it is an obviously missing part of the backport, and looks identical to what was used in other upstream stable trees (3.12.y in particular). So, though I don't feel like I can properly assess the regression risk - at least we should have some interest from upstream to help fix regressions that do pop up.

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https://bugs.launchpad.net/bugs/1471892

Title:
  [arm64] Kernel panic while running coreutils testsuite

Status in linux package in Ubuntu:
  Invalid
Status in linux source package in Trusty:
  In Progress

Bug description:
  [Impact]
  The kernel crashes when building coreutils on arm64, impacting the Ubuntu buildds. Also maybe considered a local DoS, as it can be used by a local non-privileged user to crash a system.

  [Test Case]
  Build the Ubuntu coreutils package w/ tests enabled (the default) on an arm64 system.

  [Regression Risk]
  I'm no expert in this code, but it is an obviously missing part of the backport, and looks identical to what was used in other upstream stable trees (3.12.y in particular). So, though I don't feel like I can properly assess the regression risk - at least we should have some interest from upstream to help fix regressions that do pop up.

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1471892/+subscriptions