Re: kdump regression compared to v2.6.35

From: caiqian
Date: Sat Aug 28 2010 - 14:37:28 EST

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Never mind. I figured out the bad commit,

commit 3b7433b8a8a83c87972065b1852b7dcae691e464
Merge: 4a386c3 6ee0578
Author: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Date: Sat Aug 7 12:42:58 2010 -0700

Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/wq

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/wq: (55 commits)
workqueue: mark init_workqueues() as early_initcall()
workqueue: explain for_each_*cwq_cpu() iterators
fscache: fix build on !CONFIG_SYSCTL
slow-work: kill it
gfs2: use workqueue instead of slow-work
drm: use workqueue instead of slow-work
cifs: use workqueue instead of slow-work
fscache: drop references to slow-work
fscache: convert operation to use workqueue instead of slow-work
fscache: convert object to use workqueue instead of slow-work
workqueue: fix how cpu number is stored in work->data
workqueue: fix mayday_mask handling on UP
workqueue: fix build problem on !CONFIG_SMP
workqueue: fix locking in retry path of maybe_create_worker()
async: use workqueue for worker pool
workqueue: remove WQ_SINGLE_CPU and use WQ_UNBOUND instead
workqueue: implement unbound workqueue
workqueue: prepare for WQ_UNBOUND implementation
libata: take advantage of cmwq and remove concurrency limitations
workqueue: fix worker management invocation without pending works
...

Fixed up conflicts in fs/cifs/* as per Tejun. Other trivial conflicts in
include/linux/workqueue.h, kernel/trace/Kconfig and kernel/workqueue.c

----- caiqian@xxxxxxxxxx wrote:

> Hmm, after bisect the mainline, it pointed to a wrong commit earlier
> than v2.6.35, since we knew that v2.6.35 was working fine and
> v2.6.36-rc1 was broken. Here was the log starting from HEAD (bad) and
> v2.6.35 (good).
>
> I noticed that we got this too,
> # git bisect good
> Bisecting: a merge base must be tested
> [21aa9af03d06cb1d19a3738e5cf12acff984e69b] sched: add hooks for
> workqueue
>
> # git bisect log
> git bisect start
> # good: [ab69bcd66fb4be64edfc767365cb9eb084961246] Merge
> git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core-2.6
> git bisect good ab69bcd66fb4be64edfc767365cb9eb084961246
> # good: [1cfd2bda8c486ae0e7a8005354758ebb68172bca] Merge branch
> 'linux-next' of
> git://git.kernel.org/pub/scm/linux/kernel/git/jbarnes/pci-2.6
> git bisect good 1cfd2bda8c486ae0e7a8005354758ebb68172bca
> # bad: [faa38b5e0e092914764cdba9f83d31a3f794d182] Merge branch
> 'for-linus' of
> git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound-2.6
> git bisect bad faa38b5e0e092914764cdba9f83d31a3f794d182
> # bad: [5df6b8e65ad0f2eaee202ff002ac00d1ac605315] Merge branch
> 'nfs-for-2.6.36' of git://git.linux-nfs.org/projects/trondmy/nfs-2.6
> git bisect bad 5df6b8e65ad0f2eaee202ff002ac00d1ac605315
> # bad: [1fc7995d19139d6f99203b43c161968f3f554a15] Merge
> git://git.kernel.org/pub/scm/linux/kernel/git/sfrench/cifs-2.6
> git bisect bad 1fc7995d19139d6f99203b43c161968f3f554a15
> # good: [e8779776afbd5f2d5315cf48c4257ca7e9b250fb] Merge branch
> 'x86-mce-for-linus' of
> git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip
> git bisect good e8779776afbd5f2d5315cf48c4257ca7e9b250fb
> # bad: [f34217977d717385a3e9fd7018ac39fade3964c0] workqueue: implement
> unbound workqueue
> git bisect bad f34217977d717385a3e9fd7018ac39fade3964c0
> # good: [7e27d6e778cd87b6f2415515d7127eba53fe5d02] Linux 2.6.35-rc3
> git bisect good 7e27d6e778cd87b6f2415515d7127eba53fe5d02
> # good: [21aa9af03d06cb1d19a3738e5cf12acff984e69b] sched: add hooks
> for workqueue
> git bisect good 21aa9af03d06cb1d19a3738e5cf12acff984e69b
> # good: [c8e55f360210c1bc49bea5d62bc3939b7ee13483] workqueue:
> implement worker states
> git bisect good c8e55f360210c1bc49bea5d62bc3939b7ee13483
> # good: [d320c03830b17af64e4547075003b1eeb274bc6c] workqueue:
> s/__create_workqueue()/alloc_workqueue()/, and add system workqueues
> git bisect good d320c03830b17af64e4547075003b1eeb274bc6c
> # good: [4ce48b37bfedc2bc11e61eae76784887e88b922c] workqueue: fix race
> condition in flush_workqueue()
> git bisect good 4ce48b37bfedc2bc11e61eae76784887e88b922c
> # good: [d313dd85ad846bc768d58e9ceb28588f917f4c9a] workqueue: fix
> worker management invocation without pending works
> git bisect good d313dd85ad846bc768d58e9ceb28588f917f4c9a
> # good: [bdbc5dd7de5d07d6c9d3536e598956165a031d4c] workqueue: prepare
> for WQ_UNBOUND implementation
> git bisect good bdbc5dd7de5d07d6c9d3536e598956165a031d4c
>
> Any suggestion how to track it down?
>
> ----- "CAI Qian" <caiqian@xxxxxxxxxx> wrote:
>
> > Just a head-up, the kdump kernel is stuck here. Bisect indicated
> that
> > cc41f5cede3c63836d1c0958204630b07f5b5ee7 was also good.
> >
> > Kernel command line: ro root=/dev/mapper/vg_intels3e3601-lv_root
> > rd_LVM_LV=vg_intels3e3601/lv_root rd_LVM_LV=vg_intels3e3601/lv_swap
> > rd_NO_LUKS rd_NO_MD rd_NO_DM LANG=en_US.UTF-8
> > SYSFONT=latarcyrheb-sun16 KEYBOARDTYPE=pc KEYTABLE=us
> > console=ttyS0,115200 irqpoll maxcpus=1 reset_devices
> > cgroup_disable=memory memmap=exactmap memmap=640K@0K
> > memmap=130412K@49792K elfcorehdr=180204K memmap=128K$896K
> > memmap=2124K#1978520K memmap=4280K#1980644K memmap=464K$1984924K
> > memmap=156K#1985388K memmap=84K$1985544K memmap=92K#1985628K
> > memmap=8K$1985720K memmap=124K#1985728K memmap=136K$1985852K
> > memmap=192K#1985988K memmap=260K$1986180K memmap=2816K#1986440K
> > memmap=176K$1989256K memmap=3028K#1989432K memmap=2048K#1992460K
> > memmap=2072K#1994508K memmap=8K$1996580K memmap=324K#1996588K
> > memmap=428K$1996912K memmap=31584K#1997340K memmap=960K$2028924K
> > memmap=1248K#2029884K memmap=288K#2031132K memmap=192K#2031420K
> > memmap=327684K$2031612K memmap=16384K$4128768K memmap=16K$4174960K
> > memmap=16384K$4177920K
> > Misrouted IRQ fixup and polling support enabled
> > This may significantly impact system performance
> > Disabling memory control group subsystem
> > PID hash table entries: 512 (order: 0, 4096 bytes)
> > Checking aperture...
> > No AGP bridge found
> > Queued invalidation will be enabled to support x2apic and
> > Intr-remapping.
> > Subtract (141 early reservations)
> > #1 [0004000000 - 00052b1548] TEXT DATA BSS
> > #2 [000ab63000 - 000afef000] RAMDISK
> > #3 [00052b2000 - 00052b2220] BRK
> > #4 [000009b000 - 00000fdd20] BIOS reserved
> > #5 [00000fdd30 - 0000100000] BIOS reserved
> > #6 [00000fdd20 - 00000fdd30] MP-table mpf
> > #7 [0000000012 - 000000f012] MP-table mpc
> > #8 [0000010000 - 0000012000] TRAMPOLINE
> > #9 [0000012000 - 0000016000] ACPI WAKEUP
> > #10 [0000016000 - 0000017000] PGTABLE
> > #11 [0000017000 - 000001703c] ACPI SLIT
> > #12 [000000f040 - 000000f4c0] MEMNODEMAP
> > #13 [00030a0000 - 00030c7000] NODE_DATA
> > #14 [00030c7000 - 00030c8000] BOOTMEM
> > #15 [00034c8000 - 00034c8030] BOOTMEM
> > #16 [00038c9000 - 00038ca000] BOOTMEM
> > #17 [00038ca000 - 00038cb000] BOOTMEM
> > #18 [0003a00000 - 0003e00000] MEMMAP 0
> > #19 [00030c8000 - 00030e0000] BOOTMEM
> > #20 [00030e0000 - 00030f8000] BOOTMEM
> > #21 [00030f8000 - 00030f9000] BOOTMEM
> > #22 [00030f9000 - 00030f9041] BOOTMEM
> > #23 [00030f9080 - 00030f9149] BOOTMEM
> > #24 [00030f9180 - 00030f9768] BOOTMEM
> > #25 [00030f9780 - 00030f97e8] BOOTMEM
> > #26 [00030f9800 - 00030f9868] BOOTMEM
> > #27 [00030f9880 - 00030f98e8] BOOTMEM
> > #28 [00030f9900 - 00030f9968] BOOTMEM
> > #29 [00030f9980 - 00030f99e8] BOOTMEM
> > #30 [00030f9a00 - 00030f9a68] BOOTMEM
> > #31 [00030f9a80 - 00030f9ae8] BOOTMEM
> > #32 [00030f9b00 - 00030f9b68] BOOTMEM
> > #33 [00030f9b80 - 00030f9be8] BOOTMEM
> > #34 [00030f9c00 - 00030f9c68] BOOTMEM
> > #35 [00030f9c80 - 00030f9ce8] BOOTMEM
> > #36 [00030f9d00 - 00030f9d68] BOOTMEM
> > #37 [00030f9d80 - 00030f9de8] BOOTMEM
> > #38 [00030f9e00 - 00030f9e68] BOOTMEM
> > #39 [00030f9e80 - 00030f9ee8] BOOTMEM
> > #40 [00030f9f00 - 00030f9f68] BOOTMEM
> > #41 [00030f9f80 - 00030f9fe8] BOOTMEM
> > #42 [00030fa000 - 00030fa068] BOOTMEM
> > #43 [00030fa080 - 00030fa0e8] BOOTMEM
> > #44 [00030fa100 - 00030fa168] BOOTMEM
> > #45 [00030fa180 - 00030fa1e8] BOOTMEM
> > #46 [00030fa200 - 00030fa268] BOOTMEM
> > #47 [00030fa280 - 00030fa2e8] BOOTMEM
> > #48 [00030fa300 - 00030fa368] BOOTMEM
> > #49 [00030fa380 - 00030fa3e8] BOOTMEM
> > #50 [00030fa400 - 00030fa468] BOOTMEM
> > #51 [00030fa480 - 00030fa4e8] BOOTMEM
> > #52 [00030fa500 - 00030fa568] BOOTMEM
> > #53 [00030fa580 - 00030fa5e8] BOOTMEM
> > #54 [00030fa600 - 00030fa668] BOOTMEM
> > #55 [00030fa680 - 00030fa6e8] BOOTMEM
> > #56 [00030fa700 - 00030fa768] BOOTMEM
> > #57 [00030fa780 - 00030fa7e8] BOOTMEM
> > #58 [00030fa800 - 00030fa820] BOOTMEM
> > #59 [00030fa840 - 00030fac0e] BOOTMEM
> > #60 [00030fac40 - 00030fb00e] BOOTMEM
> > #61 [0005400000 - 000541e000] BOOTMEM
> > #62 [0005420000 - 000543e000] BOOTMEM
> > #63 [0005440000 - 000545e000] BOOTMEM
> > #64 [0005460000 - 000547e000] BOOTMEM
> > #65 [0005480000 - 000549e000] BOOTMEM
> > #66 [00054a0000 - 00054be000] BOOTMEM
> > #67 [00054c0000 - 00054de000] BOOTMEM
> > #68 [00054e0000 - 00054fe000] BOOTMEM
> > #69 [0005500000 - 000551e000] BOOTMEM
> > #70 [0005520000 - 000553e000] BOOTMEM
> > #71 [0005540000 - 000555e000] BOOTMEM
> > #72 [0005560000 - 000557e000] BOOTMEM
> > #73 [0005580000 - 000559e000] BOOTMEM
> > #74 [00055a0000 - 00055be000] BOOTMEM
> > #75 [00055c0000 - 00055de000] BOOTMEM
> > #76 [00055e0000 - 00055fe000] BOOTMEM
> > #77 [0005600000 - 000561e000] BOOTMEM
> > #78 [0005620000 - 000563e000] BOOTMEM
> > #79 [0005640000 - 000565e000] BOOTMEM
> > #80 [0005660000 - 000567e000] BOOTMEM
> > #81 [0005680000 - 000569e000] BOOTMEM
> > #82 [00056a0000 - 00056be000] BOOTMEM
> > #83 [00056c0000 - 00056de000] BOOTMEM
> > #84 [00056e0000 - 00056fe000] BOOTMEM
> > #85 [0005700000 - 000571e000] BOOTMEM
> > #86 [0005720000 - 000573e000] BOOTMEM
> > #87 [0005740000 - 000575e000] BOOTMEM
> > #88 [0005760000 - 000577e000] BOOTMEM
> > #89 [0005780000 - 000579e000] BOOTMEM
> > #90 [00057a0000 - 00057be000] BOOTMEM
> > #91 [00057c0000 - 00057de000] BOOTMEM
> > #92 [00057e0000 - 00057fe000] BOOTMEM
> > #93 [0005800000 - 000581e000] BOOTMEM
> > #94 [0005820000 - 000583e000] BOOTMEM
> > #95 [0005840000 - 000585e000] BOOTMEM
> > #96 [0005860000 - 000587e000] BOOTMEM
> > #97 [0005880000 - 000589e000] BOOTMEM
> > #98 [00058a0000 - 00058be000] BOOTMEM
> > #99 [00058c0000 - 00058de000] BOOTMEM
> > #100 [00058e0000 - 00058fe000] BOOTMEM
> > #101 [0005900000 - 000591e000] BOOTMEM
> > #102 [0005920000 - 000593e000] BOOTMEM
> > #103 [0005940000 - 000595e000] BOOTMEM
> > #104 [0005960000 - 000597e000] BOOTMEM
> > #105 [0005980000 - 000599e000] BOOTMEM
> > #106 [00059a0000 - 00059be000] BOOTMEM
> > #107 [00059c0000 - 00059de000] BOOTMEM
> > #108 [00059e0000 - 00059fe000] BOOTMEM
> > #109 [0005a00000 - 0005a1e000] BOOTMEM
> > #110 [0005a20000 - 0005a3e000] BOOTMEM
> > #111 [0005a40000 - 0005a5e000] BOOTMEM
> > #112 [0005a60000 - 0005a7e000] BOOTMEM
> > #113 [0005a80000 - 0005a9e000] BOOTMEM
> > #114 [0005aa0000 - 0005abe000] BOOTMEM
> > #115 [0005ac0000 - 0005ade000] BOOTMEM
> > #116 [0005ae0000 - 0005afe000] BOOTMEM
> > #117 [0005b00000 - 0005b1e000] BOOTMEM
> > #118 [0005b20000 - 0005b3e000] BOOTMEM
> > #119 [0005b40000 - 0005b5e000] BOOTMEM
> > #120 [0005b60000 - 0005b7e000] BOOTMEM
> > #121 [0005b80000 - 0005b9e000] BOOTMEM
> > #122 [0005ba0000 - 0005bbe000] BOOTMEM
> > #123 [0005bc0000 - 0005bde000] BOOTMEM
> > #124 [0005be0000 - 0005bfe000] BOOTMEM
> > #125 [00030fd040 - 00030fd048] BOOTMEM
> > #126 [00030fd080 - 00030fd088] BOOTMEM
> > #127 [00030fd0c0 - 00030fd1c0] BOOTMEM
> > #128 [00030fd1c0 - 00030fd3c0] BOOTMEM
> > #129 [00030fd3c0 - 00030fd4d0] BOOTMEM
> > #130 [00030fd500 - 00030fd548] BOOTMEM
> > #131 [00030fd580 - 00030fd5c8] BOOTMEM
> > #132 [00030fb040 - 00030fb240] BOOTMEM
> > #133 [00030fb240 - 00030fb440] BOOTMEM
> > #134 [00030fb440 - 00030fb640] BOOTMEM
> > #135 [00030fb640 - 00030fb840] BOOTMEM
> > #136 [00030fb840 - 00030fba40] BOOTMEM
> > #137 [00030fba40 - 00030fbc40] BOOTMEM
> > #138 [00030fbc40 - 00030fbe40] BOOTMEM
> > #139 [00030fbe40 - 00030fc040] BOOTMEM
> > #140 [00030fc040 - 00030fd040] BOOTMEM
> > Memory: 94968k/180204k available (4766k kernel code, 49156k absent,
> > 36080k reserved, 7642k data, 1448k init)
> > Hierarchical RCU implementation.
> > RCU-based detection of stalled CPUs is disabled.
> > Verbose stalled-CPUs detection is disabled.
> > NR_IRQS:262400 nr_irqs:2008
> > Extended CMOS year: 2000
> > Spurious LAPIC timer interrupt on cpu 0
> > Console: colour VGA+ 80x25
> > console [ttyS0] enabled
> > Fast TSC calibration using PIT
> > Detected 1994.798 MHz processor.
> > Calibrating delay loop (skipped), value calculated using timer
> > frequency.. 3989.59 BogoMIPS (lpj=1994798)
> > pid_max: default: 65536 minimum: 512
> > Security Framework initialized
> > SELinux: Initializing.
> > Dentry cache hash table entries: 16384 (order: 5, 131072 bytes)
> > Inode-cache hash table entries: 8192 (order: 4, 65536 bytes)
> > Mount-cache hash table entries: 256
> > Initializing cgroup subsys ns
> > Initializing cgroup subsys cpuacct
> > Initializing cgroup subsys memory
> > Initializing cgroup subsys devices
> > Initializing cgroup subsys freezer
> > Initializing cgroup subsys net_cls
> > Initializing cgroup subsys blkio
> > CPU: Physical Processor ID: 3
> > CPU: Processor Core ID: 0
> > mce: CPU supports 22 MCE banks
> > using mwait in idle threads.
> > Performance Events: PEBS fmt1+, Nehalem events, Intel PMU driver.
> > ... version: 3
> > ... bit width: 48
> > ... generic registers: 4
> > ... value mask: 0000ffffffffffff
> > ... max period: 000000007fffffff
> > ... fixed-purpose events: 3
> > ... event mask: 000000070000000f
> > SMP alternatives: switching to UP code
> > ACPI: Core revision 20100702
> > ftrace: converting mcount calls to 0f 1f 44 00 00
> > ftrace: allocating 18514 entries in 73 pages
> > DMAR: Host address width 48
> > DMAR: DRHD base: 0x000000fd800000 flags: 0x0
> > IOMMU 0: reg_base_addr fd800000 ver 1:0 cap c90780106f0462 ecap
> f020fe
> > DMAR: DRHD base: 0x000000fd000000 flags: 0x1
> > IOMMU 1: reg_base_addr fd000000 ver 1:0 cap c90780106f0462 ecap
> f020fe
> > DMAR: RMRR base: 0x0000007be29000 end: 0x0000007be2bfff
> > DMAR: RMRR base: 0x0000007be16000 end: 0x0000007be16fff
> > DMAR: RMRR base: 0x0000007be13000 end: 0x0000007be13fff
> > DMAR: RMRR base: 0x0000007be10000 end: 0x0000007be10fff
> > DMAR: RMRR base: 0x0000007be0d000 end: 0x0000007be0dfff
> > DMAR: RMRR base: 0x0000007be0a000 end: 0x0000007be0afff
> > DMAR: RMRR base: 0x0000007be07000 end: 0x0000007be07fff
> > DMAR: RMRR base: 0x0000007be04000 end: 0x0000007be04fff
> > DMAR: RMRR base: 0x0000007be01000 end: 0x0000007be01fff
> > DMAR: ATSR flags: 0x0
> > DMAR: ATSR flags: 0x0
> > DMAR: RHSA base: 0x000000fd000000 proximity domain: 0x0
> > DMAR: RHSA base: 0x000000fd800000 proximity domain: 0x2
> > IOAPIC id 10 under DRHD base 0xfd800000 IOMMU 0
> > IOAPIC id 8 under DRHD base 0xfd000000 IOMMU 1
> > IOAPIC id 9 under DRHD base 0xfd000000 IOMMU 1
> > Enabled Interrupt-remapping
> > Setting APIC routing to cluster x2apic
> > ..TIMER: vector=0x30 apic1=0 pin1=2 apic2=-1 pin2=-1
> > CPU0: Intel(R) Xeon(R) CPU X7550 @ 2.00GHz stepping 06
> > Brought up 1 CPUs
> > Total of 1 processors activated (3989.59 BogoMIPS).
> > devtmpfs: initialized
> > regulator: core version 0.5
> > NET: Registered protocol family 16
> > ACPI FADT declares the system doesn't support PCIe ASPM, so disable
> it
> > ACPI: bus type pci registered
> > PCI: MMCONFIG for domain 0000 [bus 00-ff] at [mem
> > 0x80000000-0x8fffffff] (base 0x80000000)
> > PCI: MMCONFIG at [mem 0x80000000-0x8fffffff] reserved in E820
> > PCI: Using configuration type 1 for base access
> > bio: create slab <bio-0> at 0
>
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