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Message-ID: <20150306233320.GC3556@wfg-t540p.sh.intel.com>
Date: Sat, 7 Mar 2015 07:33:20 +0800
From: Fengguang Wu <fengguang.wu@...el.com>
To: Andy Lutomirski <luto@...capital.net>
Cc: fengguang.wu@...el.com, Ingo Molnar <mingo@...nel.org>,
LKP <lkp@...org>, linux-kernel@...r.kernel.org
Subject: [x86/asm/entry] INFO: task swapper/0:1 blocked for more than 120
seconds.
Hi Andy,
Here is yet another warning message on commit
git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git x86/asm
commit 75182b1632a89f12540baa1806a7c5c180db620c
Author: Andy Lutomirski <luto@...capital.net>
AuthorDate: Thu Mar 5 19:19:03 2015 -0800
Commit: Ingo Molnar <mingo@...nel.org>
CommitDate: Fri Mar 6 08:32:57 2015 +0100
x86/asm/entry: Switch all C consumers of kernel_stack to this_cpu_sp0()
This will make modifying the semantics of kernel_stack easier.
The change to ist_begin_non_atomic() is necessary because sp0 no
longer points to the same THREAD_SIZE-aligned region as RSP;
it's one byte too high for that. At Denys' suggestion, rather
than offsetting it, just check explicitly that we're in the
correct range ending at sp0. This has the added benefit that we
no longer assume that the thread stack is aligned to
THREAD_SIZE.
Suggested-by: Denys Vlasenko <dvlasenk@...hat.com>
Signed-off-by: Andy Lutomirski <luto@...capital.net>
Cc: Borislav Petkov <bp@...en8.de>
Cc: H. Peter Anvin <hpa@...or.com>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Oleg Nesterov <oleg@...hat.com>
Cc: Thomas Gleixner <tglx@...utronix.de>
Link: http://lkml.kernel.org/r/ef8254ad414cbb8034c9a56396eeb24f5dd5b0de.1425611534.git.luto@amacapital.net
Signed-off-by: Ingo Molnar <mingo@...nel.org>
+--------------------------------------------------+------------+------------+------------+
| | 8ef46a672a | 75182b1632 | fad99646bd |
+--------------------------------------------------+------------+------------+------------+
| boot_successes | 153 | 0 | 0 |
| boot_failures | 0 | 51 | 12 |
| EIP_is_at_multi_cpu_stop | 0 | 18 | 4 |
| Kernel_panic-not_syncing:softlockup:hung_tasks | 0 | 18 | 4 |
| backtrace:smpboot_thread_fn | 0 | 18 | 4 |
| INFO:task_blocked_for_more_than#seconds | 0 | 33 | 8 |
| EIP_is_at_default_send_IPI_mask_logical | 0 | 33 | 8 |
| Kernel_panic-not_syncing:hung_task:blocked_tasks | 0 | 33 | 8 |
| backtrace:misc_register | 0 | 33 | 8 |
| backtrace:vga_arb_device_init | 0 | 33 | 8 |
| backtrace:kernel_init_freeable | 0 | 33 | 8 |
| backtrace:watchdog | 0 | 33 | 8 |
+--------------------------------------------------+------------+------------+------------+
[ 2.990165] ACPI:
[ 2.990165] ACPI: Enabled 16 GPEs in block 00 to 0FEnabled 16 GPEs in block 00 to 0F
[ 242.992054] INFO: task swapper/0:1 blocked for more than 120 seconds.
[ 242.992054] INFO: task swapper/0:1 blocked for more than 120 seconds.
[ 242.993686] Not tainted 4.0.0-rc2-00052-g75182b1 #51
[ 242.993686] Not tainted 4.0.0-rc2-00052-g75182b1 #51
[ 242.994973] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
git bisect start fad99646bd5e9e5cf78637701931518b8a55890e 4f671fe2f9523a1ea206f63fe60a7c7b3a56d5c7 --
git bisect good 7dfd6d85242a6790260381cb45ea407bd9b65af3 # 18:24 25+ 0 Merge branch 'linus'
git bisect good 0624492336dfd630334fb582eb3f20ee3e109293 # 18:34 25+ 0 Merge branch 'x86/asm'
git bisect good 93cbe2969a57747f291894e2331d9864034ac0a1 # 18:41 25+ 0 Merge branch 'timers/urgent'
git bisect good e0aa5c22486be95ff8b52926fcb4f0e6f01a79c6 # 18:47 25+ 0 Merge branch 'perf/urgent'
git bisect bad 74d398c3580c5cb5601028821833366dc8414a69 # 18:47 0- 12 Merge branch 'x86/asm'
git bisect bad 9d0c914c60f4d3123debb653340dc1f7cf44939d # 19:02 19- 25 x86/asm/entry/64/compat: Change the 32-bit sysenter code to use sp0
git bisect bad 75182b1632a89f12540baa1806a7c5c180db620c # 19:28 18- 51 x86/asm/entry: Switch all C consumers of kernel_stack to this_cpu_sp0()
git bisect good 8ef46a672a7d852709561d10672b6eaa8a4acd82 # 19:35 51+ 0 x86/asm/entry: Add this_cpu_sp0() to read sp0 for the current cpu
# first bad commit: [75182b1632a89f12540baa1806a7c5c180db620c] x86/asm/entry: Switch all C consumers of kernel_stack to this_cpu_sp0()
git bisect good 8ef46a672a7d852709561d10672b6eaa8a4acd82 # 19:38 153+ 0 x86/asm/entry: Add this_cpu_sp0() to read sp0 for the current cpu
# extra tests with DEBUG_INFO
git bisect good 75182b1632a89f12540baa1806a7c5c180db620c # 19:59 153+ 153 x86/asm/entry: Switch all C consumers of kernel_stack to this_cpu_sp0()
# extra tests on HEAD of tip/master
git bisect bad fad99646bd5e9e5cf78637701931518b8a55890e # 19:59 0- 12 Merge branch 'x86/urgent'
# extra tests on tree/branch tip/x86/asm
git bisect bad 9b47668843d800ed57f6f6bfd6f5c4cffdf201c6 # 20:09 43- 117 x86/asm/entry: Rename 'INIT_TSS_IST' to 'CPU_TSS_IST'
# extra tests on tree/branch tip/master
git bisect bad fad99646bd5e9e5cf78637701931518b8a55890e # 20:09 0- 12 Merge branch 'x86/urgent'
# extra tests on tree/branch linus/master
git bisect good 99aedde0869ce194539166ac5a4d2e1a20995348 # 20:34 153+ 0 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 28855005be1d6a0a041de46fd2e61da2b796abff # 20:39 153+ 0 Add linux-next specific files for 20150306
This script may reproduce the error.
----------------------------------------------------------------------------
#!/bin/bash
kernel=$1
kvm=(
qemu-system-x86_64
-cpu kvm64
-enable-kvm
-kernel $kernel
-m 320
-smp 1
-net nic,vlan=1,model=e1000
-net user,vlan=1
-boot order=nc
-no-reboot
-watchdog i6300esb
-rtc base=localtime
-serial stdio
-display none
-monitor null
)
append=(
hung_task_panic=1
earlyprintk=ttyS0,115200
rd.udev.log-priority=err
systemd.log_target=journal
systemd.log_level=warning
debug
apic=debug
sysrq_always_enabled
rcupdate.rcu_cpu_stall_timeout=100
panic=-1
softlockup_panic=1
nmi_watchdog=panic
oops=panic
load_ramdisk=2
prompt_ramdisk=0
console=ttyS0,115200
console=tty0
vga=normal
root=/dev/ram0
rw
drbd.minor_count=8
)
"${kvm[@]}" --append "${append[*]}"
----------------------------------------------------------------------------
Thanks,
Fengguang
--
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