** Description changed: == SRU Justification == IBM reports a kernel crash with Bionic while in degraded mode(Degraded cores). IBM created a patch to resolve this bug and has submitted it upstream: https://lists.ozlabs.org/pipermail/linuxppc-dev/2018-May/172835.html - The patch has not laned in mainline as of yet, so it is being submitted + The patch has not landed in mainline as of yet, so it is being submitted as a SAUCE patch. - == Fix == UBUNTU: SAUCE: powerpc/perf: Fix memory allocation for core-imc based on num_possible_cpus() == Regression Potential == Low. Limited to powerpc. == Test Case == A test kernel was built with this patch and tested by the original bug reporter. The bug reporter states the test kernel resolved the bug. - - kernel crash The system is going down NOW! Sent SIGTERM to all processes Sent SIGKILL to all processes [ 64.713154] kexec_core: Starting new kernel [ 156.281504630,5] OPAL: Switch to big-endian OS [ 158.440263459,5] OPAL: Switch to little-endian OS [ 1.889211] Unable to handle kernel paging request for data at address 0x678e549df9e2878c [ 1.889289] Faulting instruction address: 0xc00000000038aa30 [ 1.889344] Oops: Kernel access of bad area, sig: 11 [#1] [ 1.889386] LE SMP NR_CPUS=2048 NUMA PowerNV [ 1.889432] Modules linked in: [ 1.889468] CPU: 3 PID: 1 Comm: swapper/0 Not tainted 4.15.0-20-generic #21-Ubuntu [ 1.889545] NIP: c00000000038aa30 LR: c00000000038aa1c CTR: 0000000000000000 [ 1.889608] REGS: c000003fed193840 TRAP: 0380 Not tainted (4.15.0-20-generic) [ 1.889670] MSR: 9000000000009033 <SF,HV,EE,ME,IR,DR,RI,LE> CR: 28000884 XER: 20040000 [ 1.889742] CFAR: c000000000016e1c SOFTE: 1 [ 1.889742] GPR00: c00000000038a914 c000003fed193ac0 c0000000016eae00 0000000000000001 [ 1.889742] GPR04: c000003fd754c7f8 000000000000002c 0000000000000001 000000000000002b [ 1.889742] GPR08: 678e549df9e28874 0000000000000000 0000000000000000 fffffffffffffffe [ 1.889742] GPR12: 0000000028000888 c00000000fa82100 c00000000000d3b8 0000000000000000 [ 1.889742] GPR16: 0000000000000000 0000000000000000 0000000000000000 0000000000000000 [ 1.889742] GPR20: 0000000000000000 0000000000000000 0000000000000000 a78e54a22eb64f8c [ 1.889742] GPR24: c000003fd754c800 678e549df9e2878c 0000000000000300 c0000000002bd05c [ 1.889742] GPR28: c000003fed01ea00 00000000014080c0 c000003fd754c800 c000003fed01ea00 [ 1.890286] NIP [c00000000038aa30] kmem_cache_alloc_trace+0x2d0/0x330 [ 1.890340] LR [c00000000038aa1c] kmem_cache_alloc_trace+0x2bc/0x330 [ 1.890391] Call Trace: [ 1.890416] [c000003fed193ac0] [c00000000038a914] kmem_cache_alloc_trace+0x1b4/0x330 (unreliable) [ 1.890491] [c000003fed193b30] [c0000000002bd05c] pmu_dev_alloc+0x3c/0x170 [ 1.890547] [c000003fed193bb0] [c0000000010e3210] perf_event_sysfs_init+0x8c/0xf0 [ 1.890611] [c000003fed193c40] [c00000000000d144] do_one_initcall+0x64/0x1d0 [ 1.890676] [c000003fed193d00] [c0000000010b4400] kernel_init_freeable+0x280/0x374 [ 1.890740] [c000003fed193dc0] [c00000000000d3d4] kernel_init+0x24/0x160 [ 1.890795] [c000003fed193e30] [c00000000000b528] ret_from_kernel_thread+0x5c/0xb4 [ 1.890857] Instruction dump: [ 1.890909] 7c97ba78 fb210038 38a50001 7f19ba78 fb290000 f8aa0000 4bc8c3f1 60000000 [ 1.890978] 7fb8b840 419e0028 e93f0022 e91f0140 <7d59482a> 7d394a14 7d4a4278 7fa95040 [ 1.891050] ---[ end trace 41b3fe7a827f3888 ]--- [ 2.900027] [ 3.900175] Kernel panic - not syncing: Attempted to kill init! exitcode=0x0000000b [ 3.900175] [ 4.71868[ 175.340944355,5] OPAL: Reboot request... 2] Rebooting in 10 seconds.. This fix is needed to resolve the crash https://lists.ozlabs.org/pipermail/linuxppc-dev/2018-May/172835.html
-- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1770849 Title: Ubuntu 18.04 kernel crashed while in degraded mode To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu-power-systems/+bug/1770849/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
