Hi, Guenter, > From: Guenter Roeck [mailto:linux@xxxxxxxxxxxx] > Sent: Monday, April 11, 2016 12:15 AM > To: Dongsheng Yang <yangds.fnst@xxxxxxxxxxxxxx> > Cc: linux-kernel@xxxxxxxxxxxxxxx; Zhao Lei <zhaolei@xxxxxxxxxxxxxx>; Peter > Zijlstra <peterz@xxxxxxxxxxxxx>; Tejun Heo <tj@xxxxxxxxxx>; Ingo Molnar > <mingo@xxxxxxxxxx>; linux-next@xxxxxxxxxxxxxxx > Subject: Commit 'sched/cpuacct: Split usage accounting into user_usage and > sys_usage' causing crashes > > Hi, > > your commit 'sched/cpuacct: Split usage accounting into user_usage and > sys_usage' in -next causes crashes with several of my qemu tests (mac99, > q3beige). Reverting the patch fixes the problem. > > Details and complete logs are available at > http://kerneltests.org/builders/qemu-ppc-next > The scripts are published at > https://github.com/groeck/linux-build-test/tree/master/rootfs/ppc > > Crash log and bisect log are attached. > Thanks for report. Seems it is same problem discussed in https://lkml.org/lkml/2016/4/4/312 and fixed by: https://lkml.org/lkml/2016/4/6/306 Thanks Zhaolei > Guenter > > --- > Crash log: > > [ ... ] > ftrace: allocating 20986 entries in 62 pages > Unable to handle kernel paging request for data at address 0x00000084 > Faulting instruction address: 0xc0067188 > Oops: Kernel access of bad area, sig: 11 [#1] > PREEMPT PowerMac > Modules linked in: > CPU: 0 PID: 2 Comm: kthreadd Not tainted > 4.6.0-rc2-next-20160408-yocto-standard #1 > task: c78d0e00 ti: c78e8000 task.ti: c78e8000 > NIP: c0067188 LR: c005c0d0 CTR: c005cf84 > REGS: c78e9da0 TRAP: 0300 Not tainted > (4.6.0-rc2-next-20160408-yocto-standard) > MSR: 00001032 <ME,IR,DR,RI> CR: 82040002 XER: 00000000 > DAR: 00000084 DSISR: 40000000 > GPR00: c005c0d0 c78e9e50 c78d0e00 c78d0e00 00000000 00000000 000a25f0 > 0037ecae > GPR08: ffffffff 00000000 00000000 0027ecae 22000008 00000000 c004decc > 00000000 > GPR16: 00000000 00000000 00000000 00000000 00000000 00000000 > 00000000 00000000 > GPR24: 00000001 c78d0e00 c0918580 c78d0e30 00000000 c78d0e00 > 00000000 000a25f0 > NIP [c0067188] cpuacct_charge+0x2c/0x90 > LR [c005c0d0] update_curr+0x110/0x250 > Call Trace: > [c78e9e70] [c005c0d0] update_curr+0x110/0x250 > [c78e9ea0] [c005d048] dequeue_task_fair+0xc4/0x27c > [c78e9ed0] [c06c67d4] __schedule+0x338/0x770 > [c78e9f00] [c06c6c54] schedule+0x48/0xb8 > [c78e9f10] [c004e070] kthreadd+0x1a4/0x1dc > [c78e9f40] [c0010540] ret_from_kernel_thread+0x5c/0x64 > Instruction dump: > 4bffffd0 7c0802a6 90010004 60000000 9421ffe0 7c0802a6 bf810010 90010024 > 81230cb4 7c7d1b78 7cdf3378 7cbe2b78 <83890084> 4800fbfd 813d047c > 6b9c4000 > ---[ end trace dc8fa200cb88537f ]--- > > > --- > bisect: > > # bad: [6e5921edae25005c5c25a79bb2ff5335650c1b66] Add linux-next specific > files > # for 20160408 > # good: [9735a22799b9214d17d3c231fe377fc852f042e9] Linux 4.6-rc2 > git bisect start 'HEAD' 'v4.6-rc2' > # good: [e61201ac50d9599aef64e8885d6bfa5b35d574d7] Merge > remote-tracking branch > # 'mac80211-next/master' > git bisect good e61201ac50d9599aef64e8885d6bfa5b35d574d7 > # bad: [5c4015574ec4d63b7d3a9efbd8b77f90bcac88be] Merge > remote-tracking branch > # 'usb-chipidea-next/ci-for-usb-next' > git bisect bad 5c4015574ec4d63b7d3a9efbd8b77f90bcac88be > # good: [35fda07ad91c8d46253f6dd262800a747adcede9] Merge > remote-tracking branch > # 'sound-asoc/for-next' > git bisect good 35fda07ad91c8d46253f6dd262800a747adcede9 > # good: [a2089aa1dcd0a33b8eb67d8db0e07f859b986e04] Merge > remote-tracking branch > # 'spi/for-next' > git bisect good a2089aa1dcd0a33b8eb67d8db0e07f859b986e04 > # bad: [129f0d75057f9e78ad70e3e01f6c9edbc7de553c] Merge > remote-tracking branch > # 'irqchip/irqchip/for-next' > git bisect bad 129f0d75057f9e78ad70e3e01f6c9edbc7de553c > # bad: [9338637e6e2256ac26ac75391dc1349fb492d7c6] Merge branch > 'x86/asm' > git bisect bad 9338637e6e2256ac26ac75391dc1349fb492d7c6 > # good: [66d219014a4ee47ad4ca2b9db5fe6547353e2a56] perf/x86/intel/pt: > Move > # transaction start/stop to PMU start/stop callbacks > git bisect good 66d219014a4ee47ad4ca2b9db5fe6547353e2a56 > # good: [5367d2a3279cd7aa40535efa526fe936ec24528d] Merge branch > 'mm/urgent' > git bisect good 5367d2a3279cd7aa40535efa526fe936ec24528d > # bad: [2b8c41daba327c633228169e8bd8ec067ab443f8] sched/fair: Initiate a > new > # task's util avg to a bounded value > git bisect bad 2b8c41daba327c633228169e8bd8ec067ab443f8 > # bad: [d02c071183e1c01a76811c878c8a52322201f81f] sched/fair: Reset > # nr_balance_failed after active balancing > git bisect bad d02c071183e1c01a76811c878c8a52322201f81f > # bad: [d740037fac7052e49450f6fa1454f1144a103b55] sched/cpuacct: Split > usage > # accounting into user_usage and sys_usage > git bisect bad d740037fac7052e49450f6fa1454f1144a103b55 > # good: [5ca3726af7f66a8cc71ce4414cfeb86deb784491] sched/cpuacct: Show > all > # possible CPUs in cpuacct output > git bisect good 5ca3726af7f66a8cc71ce4414cfeb86deb784491 > # first bad commit: [d740037fac7052e49450f6fa1454f1144a103b55] > sched/cpuacct: > # Split usage accounting into user_usage and sys_usage > -- To unsubscribe from this list: send the line "unsubscribe linux-next" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
