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Date: Wed, 25 Jun 2014 17:17:44 +0800
From: Fengguang Wu <fengguang.wu@...el.com>
To: Mark Brown <broonie@...aro.org>
Cc: Jet Chen <jet.chen@...el.com>, Yuanhan Liu <yuanhan.liu@...el.com>,
LKP <lkp@...org>, linux-kernel@...r.kernel.org,
"Su, Tao" <tao.su@...el.com>
Subject: [regulator] BUG: kernel early hang without any printk output
Hi Mark,
It seems this merge commit makes the kernel not 100% bootable.
5 out of 53 boots block w/o any dmesg output.
git://git.kernel.org/pub/scm/linux/kernel/git/broonie/regulator.git for-next
commit a920677c35627d1baac9776dfba0286e7a1e1f0f
Merge: 3b9f3f3 ce44beb 03187c7 c969faa 53ddddc
Author: Mark Brown <broonie@...aro.org>
AuthorDate: Sun Jun 22 11:58:45 2014 +0100
Merge remote-tracking branches 'regulator/topic/88pm800', 'regulator/topic/ab8500', 'regulator/topic/bcm590xx' and 'regulator/topic/ltc3589' into regulator-next
Attached dmesg for the parent commit, too, to help confirm whether it is a noise error.
+------------------------------------------------------------+------------+------------+------------+------------+------------+------------+------------------+
| | 3b9f3f33ad | ce44beb7c0 | 03187c72db | c969faadf0 | 53ddddcad5 | a920677c35 | v3.16-rc2_062302 |
+------------------------------------------------------------+------------+------------+------------+------------+------------+------------+------------------+
| boot_successes | 0 | 306 | 0 | 391 | 0 | 0 | 0 |
| boot_failures | 408 | 0 | 306 | 17 | 408 | 102 | 53 |
| genirq:Flags_mismatch_irq.(serial)vs.(goldfish_pdev_bus) | 408 | 0 | 306 | 0 | 408 | 96 | 48 |
| WARNING:CPU:PID:at_kernel/events/core.c:perf_swevent_add() | 0 | 0 | 0 | 16 | | | |
| WARNING:CPU:PID:at_mm/slab_common.c:kmalloc_slab() | 0 | 0 | 0 | 1 | | | |
| backtrace:netlink_setsockopt | 0 | 0 | 0 | 1 | | | |
| backtrace:SyS_setsockopt | 0 | 0 | 0 | 1 | | | |
| backtrace:SyS_socketcall | 0 | 0 | 0 | 1 | | | |
| BUG:kernel_early_hang_without_any_printk_output | 0 | 0 | 0 | 0 | 0 | 6 | 5 |
+------------------------------------------------------------+------------+------------+------------+------------+------------+------------+------------------+
BUG: kernel early hang without any printk output
Command line: hung_task_panic=1 earlyprintk=ttyS0,115200 debug apic=debug sysrq_always_enabled rcupdate.rcu_cpu_stall_timeout=100 panic=10 softlockup_panic=1 nmi_watchdog=panic prompt_ramdisk=0 console=ttyS0,115200 console=tty0 vga=normal root=/dev/ram0 rw link=/kbuild-tests/run-queue/kvm/i386-randconfig-c1-06230242/linux-devel:devel-hourly-2014062302:a920677c35627d1baac9776dfba0286e7a1e1f0f:bisect-linux4/.vmlinuz-a920677c35627d1baac9776dfba0286e7a1e1f0f-20140623053514-40-ivb42 branch=linux-devel/devel-hourly-2014062302 BOOT_IMAGE=/kernel/i386-randconfig-c1-06230242/a920677c35627d1baac9776dfba0286e7a1e1f0f/vmlinuz-3.16.0-rc1-00017-ga920677 drbd.minor_count=8
Early hang kernel: vmlinuz-3.16.0-rc1-00017-ga920677 3.16.0-rc1-00017-ga920677 #6
Elapsed time: 35
git bisect start 375e99ffd57ef530588f58288bc5fe39cf94cbae a497c3ba1d97fc69c1e78e7b96435ba8c2cb42ee --
git bisect good b3aa7a29807dac2dd7355ac97eb1462e97acf9e0 # 03:43 102+ 102 Merge 'rcu/dev.2014.06.19c' into devel-hourly-2014062302
git bisect bad 9e6424f1b56fc78818b92a5954fe8e37da497f32 # 04:05 0- 1 Merge 'regulator/for-next' into devel-hourly-2014062302
git bisect good e9ffadad61b2af6372be2e06802c0faeb5550250 # 04:26 102+ 102 Merge 'arm-jcooper/irqchip/urgent' into devel-hourly-2014062302
git bisect good 12318f8cc77eab9ca20188257664a2fc9f63a8a9 # 04:48 102+ 102 Merge 'arm-soc/for-next' into devel-hourly-2014062302
git bisect good 222980021ed94fe1201ad129ac7672cb7275ecec # 05:05 102+ 102 Merge 'spi/for-next' into devel-hourly-2014062302
git bisect good 3b9f3f33ad71b863673388f88cd2ba7df803e730 # 05:20 102+ 102 Merge remote-tracking branch 'regulator/topic/core' into regulator-next
git bisect bad a920677c35627d1baac9776dfba0286e7a1e1f0f # 05:48 0- 1 Merge remote-tracking branches 'regulator/topic/88pm800', 'regulator/topic/ab8500', 'regulator/topic/bcm590xx' and 'regulator/topic/ltc3589' into regulator-next
git bisect good c969faadf02076641a81197f2e8641c40d232edd # 06:07 102+ 3 regulator: bcm590xx: remove unnecessary OOM messages
git bisect good ce44beb7c0b12d33ce88b396aeaea0ba4ca1bbfc # 06:29 102+ 0 regulator: 88pm800: remove duplicate PM800_BUCK3 define
git bisect good 53ddddcad5a4fc41db3e2f16c22344d8da58cf74 # 06:44 102+ 102 regulator: ltc3589: Staticize ltc3589_reg_defaults
# first bad commit: [a920677c35627d1baac9776dfba0286e7a1e1f0f] Merge remote-tracking branches 'regulator/topic/88pm800', 'regulator/topic/ab8500', 'regulator/topic/bcm590xx' and 'regulator/topic/ltc3589' into regulator-next
git bisect good 3b9f3f33ad71b863673388f88cd2ba7df803e730 # 06:52 306+ 408 Merge remote-tracking branch 'regulator/topic/core' into regulator-next
git bisect good ce44beb7c0b12d33ce88b396aeaea0ba4ca1bbfc # 06:57 306+ 0 regulator: 88pm800: remove duplicate PM800_BUCK3 define
git bisect good 03187c72db60e20354aca6802bc5cc3e42c1d6e1 # 07:10 306+ 306 regulator: ab8500: Remove ab8500_regulator_debug_init/exit()
git bisect good c969faadf02076641a81197f2e8641c40d232edd # 07:16 306+ 17 regulator: bcm590xx: remove unnecessary OOM messages
git bisect good 53ddddcad5a4fc41db3e2f16c22344d8da58cf74 # 07:23 306+ 408 regulator: ltc3589: Staticize ltc3589_reg_defaults
git bisect bad 375e99ffd57ef530588f58288bc5fe39cf94cbae # 07:23 0- 53 0day head guard for 'devel-hourly-2014062302'
git bisect good a497c3ba1d97fc69c1e78e7b96435ba8c2cb42ee # 07:41 306+ 408 Linux 3.16-rc2
git bisect good 633594bb2d3890711a887897f2003f41735f0dfa # 08:08 306+ 306 Add linux-next specific files for 20140620
This script may reproduce the error.
-----------------------------------------------------------------------------
#!/bin/bash
kernel=$1
kvm=(
qemu-system-x86_64 -cpu kvm64 -enable-kvm
-kernel $kernel
-smp 2
-m 256M
-net nic,vlan=0,macaddr=00:00:00:00:00:00,model=virtio
-net user,vlan=0
-net nic,vlan=1,model=e1000
-net user,vlan=1
-boot order=nc
-no-reboot
-watchdog i6300esb
-serial stdio
-display none
-monitor null
)
append=(
debug
sched_debug
apic=debug
ignore_loglevel
sysrq_always_enabled
panic=10
prompt_ramdisk=0
earlyprintk=ttyS0,115200
console=ttyS0,115200
console=tty0
vga=normal
root=/dev/ram0
rw
)
"${kvm[@]}" --append "${append[*]}"
-----------------------------------------------------------------------------
Thanks,
Fengguang
View attachment "dmesg-quantal-ivb42-110:20140623054910:i386-randconfig-c1-06230242:3.16.0-rc1-00017-ga920677:6" of type "text/plain" (1958 bytes)
View attachment "dmesg-quantal-ivb41-100:20140623064903:i386-randconfig-c1-06230242:3.16.0-rc1-00011-g3b9f3f3:5" of type "text/plain" (39025 bytes)
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