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Date: Fri, 6 Mar 2015 14:09:14 +0800
From: Fengguang Wu <fengguang.wu@...el.com>
To: Andy Lutomirski <luto@...capital.net>
Cc: fengguang.wu@...el.com, LKP <lkp@...org>,
linux-kernel@...r.kernel.org
Subject: [x86] INFO: task swapper:1 blocked for more than 120 seconds.
Greetings,
0day kernel testing robot got the below dmesg and the first bad commit is
git://git.kernel.org/pub/scm/linux/kernel/git/luto/linux.git revert-a0bd5e26b32a2e1f08ff99017d0997118fbb2485-ef8254ad414cbb8034c9a56396eeb24f5dd5b0de
commit ef8254ad414cbb8034c9a56396eeb24f5dd5b0de
Author: Andy Lutomirski <luto@...capital.net>
AuthorDate: Thu Feb 26 15:14:01 2015 -0800
Commit: Andy Lutomirski <luto@...capital.net>
CommitDate: Thu Mar 5 15:35:21 2015 -0800
x86: Switch all C consumers of kernel_stack to this_cpu_sp0
This will make modifying the semantics of kernel_stack easier.
Signed-off-by: Andy Lutomirski <luto@...capital.net>
+------------------------------------------------------------------+------------+------------+------------+
| | 8d67558185 | ef8254ad41 | c87d971315 |
+------------------------------------------------------------------+------------+------------+------------+
| boot_successes | 12 | 0 | 0 |
| boot_failures | 68 | 20 | 12 |
| Kernel_panic-not_syncing:Out_of_memory_and_no_killable_processes | 68 | | |
| backtrace:serio_handle_event | 68 | | |
| INFO:task_blocked_for_more_than#seconds | 0 | 20 | 12 |
| Kernel_panic-not_syncing:hung_task:blocked_tasks | 0 | 20 | 12 |
| backtrace:misc_register | 0 | 20 | 12 |
| backtrace:vga_arb_device_init | 0 | 20 | 12 |
| backtrace:kernel_init_freeable | 0 | 20 | 12 |
| backtrace:watchdog | 0 | 20 | 12 |
+------------------------------------------------------------------+------------+------------+------------+
[ 8.256018] random: nonblocking pool is initialized
[ 8.256018] random: nonblocking pool is initialized
[ 240.191019] INFO: task swapper:1 blocked for more than 120 seconds.
[ 240.191019] INFO: task swapper:1 blocked for more than 120 seconds.
[ 240.192012] Not tainted 4.0.0-rc2-00051-gef8254a #5
[ 240.192012] Not tainted 4.0.0-rc2-00051-gef8254a #5
[ 240.193004] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
git bisect start c87d97131581b68d2662319b92bed9e1bdb8f294 13a7a6ac0a11197edcd0f756a035f472b42cdf8b --
git bisect good 98ad05d11493f4185838e72442e456b69b52cd8a # 09:18 20+ 0 Merge 'jtkirshe-net/community' into devel-roam-rand-201503060832
git bisect good 727969f6d9f5a5eab5f24683af0b31cb2c63b11e # 10:02 20+ 7 Merge 'block/blk-polled-io' into devel-roam-rand-201503060832
git bisect bad 85ea6a2a342c2b53d831ef1a07e58d47c17913dc # 10:29 0- 15 Merge 'luto/x86/entry' into devel-roam-rand-201503060832
git bisect good f8e92fb4b0ffc4d62279ab39f34e798e37e90b0b # 11:03 20+ 12 Merge tag 'alternatives_padding' of git://git.kernel.org/pub/scm/linux/kernel/git/bp/bp into x86/asm
git bisect good ebfc453e27c676e104378366a0b027e5c6918631 # 11:06 20+ 0 x86/asm/entry/64: Clean up and document various entry code details
git bisect good 8d675581859712bee09a055ed8f785d80dac1eca # 11:11 20+ 11 x86: Add this_cpu_sp0() to read sp0 for the current cpu
git bisect bad da29fb2a793e4f649d93ce2d1ed320ebe8516262 # 11:20 0- 1 x86: Rename init_tss to cpu_tss
git bisect bad 88ff9006163d296a0665338585c36d9bfb85235d # 11:38 0- 2 x86, asm: Change the 32-bit sysenter code to use sp0
git bisect bad ef8254ad414cbb8034c9a56396eeb24f5dd5b0de # 11:44 0- 20 x86: Switch all C consumers of kernel_stack to this_cpu_sp0
# first bad commit: [ef8254ad414cbb8034c9a56396eeb24f5dd5b0de] x86: Switch all C consumers of kernel_stack to this_cpu_sp0
git bisect good 8d675581859712bee09a055ed8f785d80dac1eca # 11:46 60+ 68 x86: Add this_cpu_sp0() to read sp0 for the current cpu
# extra tests with DEBUG_INFO
git bisect good ef8254ad414cbb8034c9a56396eeb24f5dd5b0de # 11:58 60+ 60 x86: Switch all C consumers of kernel_stack to this_cpu_sp0
# extra tests on HEAD of linux-devel/devel-roam-rand-201503060832
git bisect bad c87d97131581b68d2662319b92bed9e1bdb8f294 # 11:58 0- 12 0day head guard for 'devel-roam-rand-201503060832'
# extra tests on tree/branch luto/x86/entry
git bisect bad c68358fe5abeb55f430015010f14fc458f5d7d57 # 12:15 0- 37 x86, asm: Rename INIT_TSS_IST to TSS_IST
# extra tests with first bad commit reverted
# extra tests on tree/branch linus/master
git bisect good 99aedde0869ce194539166ac5a4d2e1a20995348 # 12:24 60+ 16 Merge branch 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
# extra tests on tree/branch next/master
git bisect good cbbf783608bd1f177fd8b1f6498bb2481116beed # 12:30 60+ 22 Add linux-next specific files for 20150305
This script may reproduce the error.
----------------------------------------------------------------------------
#!/bin/bash
kernel=$1
kvm=(
qemu-system-x86_64
-enable-kvm
-cpu Haswell,+smep,+smap
-kernel $kernel
-m 320
-smp 2
-net nic,vlan=1,model=e1000
-net user,vlan=1
-boot order=nc
-no-reboot
-watchdog i6300esb
-rtc base=localtime
-serial stdio
-display none
-monitor null
)
append=(
hung_task_panic=1
earlyprintk=ttyS0,115200
rd.udev.log-priority=err
systemd.log_target=journal
systemd.log_level=warning
debug
apic=debug
sysrq_always_enabled
rcupdate.rcu_cpu_stall_timeout=100
panic=-1
softlockup_panic=1
nmi_watchdog=panic
oops=panic
load_ramdisk=2
prompt_ramdisk=0
console=ttyS0,115200
console=tty0
vga=normal
root=/dev/ram0
rw
drbd.minor_count=8
)
"${kvm[@]}" --append "${append[*]}"
----------------------------------------------------------------------------
Thanks,
Fengguang
View attachment "dmesg-quantal-kbuild-21:20150306114251:i386-randconfig-r1-0305:4.0.0-rc2-00051-gef8254a:5" of type "text/plain" (32175 bytes)
View attachment "dmesg-quantal-client1-1:20150306110733:i386-randconfig-r1-0305:4.0.0-rc2-00050-g8d67558:3" of type "text/plain" (59701 bytes)
View attachment "config-4.0.0-rc2-00051-gef8254a" of type "text/plain" (75642 bytes)
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