Thomas Meyer | 23 Aug 14:14 2014
Picon

[uml-user] Long loop in __getnsdayoftime() after resume from ram

Hello,

in UML kernel 3.16.1 I get a long loop in __getnstimeofday()
(kernel/time/timekeeping.c:315) in the call of timespec_add_ns(),
because it seems like the tk->xtime_sec wasn't updated yet, but the
nsecs were. nsecs can be as high as 8111000111000111000l when left the
host kernel suspended to ram over night.

then the function timespec_add_ns() (include/linux/time.h:266)
will call __iter_div_u64_rem() which has an optimized loop for the case
that the dividend is not much bigger as the divisior.
but this isn't the case for resume from ram on the host kernel.

any ideas how to fix this? is it possible to intercept the resume from
ram and update the timekeeper->xtime_sec somehow?
or can the um arch somehow overwrite timespec_add_ns() to always use
div_u64_rem() instead?

how does the host kernel deal with this? are there some .suspend/.resume
callbacks missing in the um "itimer" clocksource?

with kind regards
thomas

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Thomas Meyer | 19 Aug 20:53 2014
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[uml-user] 3.16 build without optimization fails

Hi,

the build with -O0 fails with:

make -f scripts/Makefile.build obj=init
  gcc -Wp,-MD,init/.main.o.d  -nostdinc -isystem /usr/lib/gcc/x86_64-redhat-linux/4.8.3/include
-I./arch/um/include -Iarch/um/include/generated  -Iinclude -I./arch/um/include/uapi
-Iarch/um/include/generated/uapi -I./include/uapi -Iinclude/generated/uapi -include
./include/linux/kconfig.h -D__KERNEL__ -m64 -I./arch/x86/um -I./arch/x86/include
-I./arch/x86/include/uapi -Iarch/x86/include/generated -Iarch/x86/include/generated/uapi
-Wall -Wundef -Wstrict-prototypes -Wno-trigraphs -fno-strict-aliasing -fno-common
-Werror-implicit-function-declaration -Wno-format-security -mcmodel=large -fno-builtin -m64
-funit-at-a-time -D__arch_um__ -I./arch/um/include/shared -I./arch/x86/um/shared
-I./arch/um/include/shared/skas -Dvmap=kernel_vmap
-Din6addr_loopback=kernel_in6addr_loopback -Din6addr_any=ker
 nel_in6addr_any -Dstrrchr=kernel_strrchr -D_LARGEFILE64_SOURCE -Derrno=kernel_errno
-Dsigprocmask=kernel_sigprocmask -Dmktime=kernel_mktime -fno-delete-null-pointer-checks -O0
-Wframe-larger-than=1024 -fno-stack-protector -Wno-unused-but-set-variable
-fno-omit-frame-pointer -fno-optimize-sibling-calls -fno-var-tracking-assignments -g
-Wdeclaration-after-statement -Wno-pointer-sign -fno-strict-overflow -fconserve-stack
-Werror=implicit-int -Werror=strict-prototypes -DCC_HAVE_ASM_GOTO    -D"KBUILD_STR(s)=#s"
-D"KBUILD_BASENAME=KBUILD_STR(main)"  -D"KBUILD_MODNAME=KBUILD_STR(main)" -c -o init/main.o init/main.c
In file included from ./arch/um/include/asm/fixmap.h:58:0,
                 from ./arch/um/include/asm/pgtable.h:11,
                 from include/linux/mm.h:51,
                 from include/linux/ring_buffer.h:5,
                 from include/linux/ftrace_event.h:5,
                 from include/trace/syscall.h:6,
                 from include/linux/syscalls.h:80,
                 from init/main.c:18:
(Continue reading)

Real Name | 16 Aug 17:27 2014
Picon

[uml-user] can't trace kmem_cache_init with gdb

hi,

 I can't trace kmem_cache_init function with GDB, because gdb jump to wrong source line. Is there anyone
know how to fix this issue?

[real <at> name tmp]$ tar -Jxf linux-3.12.6.tar.xz 
[real <at> name tmp]$ cd linux-3.12.6/
[real <at> name linux-3.12.6]$ make ARCH=um defconfig
  HOSTCC  scripts/basic/fixdep
  HOSTCC  scripts/kconfig/conf.o
  SHIPPED scripts/kconfig/zconf.tab.c
  SHIPPED scripts/kconfig/zconf.lex.c
  SHIPPED scripts/kconfig/zconf.hash.c
  HOSTCC  scripts/kconfig/zconf.tab.o
  HOSTLD  scripts/kconfig/conf
scripts/kconfig/conf --defconfig arch/x86/um/Kconfig
#
# configuration written to .config
#
[real <at> name linux-3.12.6]$ make ARCH=um linux 1>log.txt
arch/um/kernel/ptrace.c: In function ‘syscall_trace_enter’:
arch/um/kernel/ptrace.c:178:32: warning: ignoring return value of
‘tracehook_report_syscall_entry’, declared with attribute warn_unused_result [-Wunused-result]
  tracehook_report_syscall_entry(regs);
                                ^

[real <at> name linux-3.12.6]$ 
[real <at> name linux-3.12.6]$ cat gdb.txt 
file linux
handle SIGSEGV pass nostop noprint
(Continue reading)

Real Name | 4 Jun 10:26 2014
Picon

[uml-user] How to run UML with valgrind and GDB?

Hi,
  I tried to run UML (linux-3.12.6-x86) kernel with valgrind and GDB. 
But valgrind always terminated because SIGSEGV signal. I searched with 
google, just got some very old resource about run linux-2.6.xx with valgrind.

 So, is it possible to run linux (>3.12) with valgrind? If yes, how to do it?

thanks

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enjoy mindful | 30 May 09:29 2014
Picon

[uml-user] how to find out which functions have been record in exception table?

Hi, all
  I build linux-3.12.6 uml with default configure.

tar -jxf linux-3.12.6.tar.bz2
cd linux-3.12.6
make ARCH=um defconfig
make ARCH=um linux

I'm confused about the exception table of the uml kernel.

$ objdump --full-contents --section=__ex_table linux

linux:     file format elf32-i386

Contents of section __ex_table:
 82a5048 3e6fdcff bcbaf6ff 396fdcff b4baf6ff  >o......9o......
 82a5058 336fdcff acbaf6ff 306fdcff bfbaf6ff  3o......0o......
 82a5068 2b6fdcff 9cbaf6ff 286fdcff afbaf6ff  +o......(o......
 82a5078 236fdcff 8cbaf6ff 206fdcff 9fbaf6ff  #o...... o......
 82a5088 1b6fdcff 7cbaf6ff 186fdcff 8fbaf6ff  .o..|....o......
 82a5098 136fdcff 6cbaf6ff 106fdcff 7fbaf6ff  .o..l....o......
 82a50a8 0b6fdcff 5cbaf6ff 086fdcff 6fbaf6ff  .o..\....o..o...
 82a50b8 036fdcff 4cbaf6ff 006fdcff 5fbaf6ff  .o..L....o.._...
 82a50c8 fb6edcff 3cbaf6ff f86edcff 4fbaf6ff  .n..<....n..O...
 82a50d8 f36edcff 2cbaf6ff f06edcff 3fbaf6ff  .n..,....n..?...
 82a50e8 eb6edcff 1cbaf6ff e86edcff 2fbaf6ff  .n.......n../...
 82a50f8 e36edcff 0cbaf6ff e06edcff 1fbaf6ff  .n.......n......
 82a5108 db6edcff fcb9f6ff d86edcff 0fbaf6ff  .n.......n......
 82a5118 d36edcff ecb9f6ff d06edcff ffb9f6ff  .n.......n......
 82a5128 cb6edcff dcb9f6ff c86edcff efb9f6ff  .n.......n......
(Continue reading)

Nalli, Sanketh | 30 May 03:22 2014
Picon

[uml-user] invalid /proc/PID/exe in UML processes

Hi,

So I start UML with the cmdline

./linux rootfstype=hostfs rw mem=1G init=/bin/bash

 

When the bash shell comes up, I run my prog : ./my_prog

 

6173 pts/8    00:00:00 linux

6180 pts/8    00:00:00 linux

6181 pts/8    00:00:00 linux

6182 pts/8    00:00:00 linux

6183 pts/8    00:00:00 linux

6188 pts/8    00:00:13 linux

 

 

The last item in the list with PID is 6188 is my program.

I can tell because my_prog increments a counter in an infinite loop

And consumes CPU cycles. It shows up on “top” as the dominant process.

 

My question:

1.       /proc/6188/exe is invalid. Why ??

I mean, it doesn’t point to anything.

Shouldn’t it point to my_prog or something ?

 

2.       What do the 4 UML processes 6173, 6180, 6181, 6182 do ? (6183 is /bin/bash whos “exe” symlink is also doesn’t point to anything !!)

3.       When a UML process, say my_prog (PID 6188) makes a system call, where is the system call executed – is it within the addr space of 6173 (the UML kernel process) or 6188 (my_prog running in UML ??)

 

-Sanketh

 

 

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Nalli, Sanketh | 28 May 22:39 2014
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[uml-user] UML with PIN

Hey,

Has anyone successfully tried running UML with PIN attached to it ?

https://software.intel.com/en-us/articles/pin-a-dynamic-binary-instrumentation-tool

 

Also, can you explain the output of ps –e, after I run UML :

1256 pts/7    00:00:00 linux

1266 pts/7    00:00:00 linux

1267 pts/7    00:00:00 linux

1268 pts/7    00:00:00 linux

1269 pts/7    00:00:00 linux

 

Why are there these many processes ?

What is a good resource to understand UML better ?

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Richard Weinberger | 26 May 16:36 2014
Picon

Re: [uml-user] UML: Get's stuck

Am 20.05.2014 16:32, schrieb Jonathan Rudenberg:
> On 2014-03-16, 11:09 AM, Richard Weinberger wrote:
>> Am 14.03.2014 15:57, schrieb Thomas Meyer:
>>>
>>> only some processes get stuck.
>>>
>>> After enabling hung task detection in the kernel I see this in the logs:
>>>
>>> [ 8040.100000] INFO: task jbd2/ubda-8:308 blocked for more than 120
>>> seconds.
> ...
>>>
>>> any ideas? some synchronisation error in ext4?
>>
>> Hmm, maybe you suffer from the same issue this patch tries to address:
>> https://lkml.org/lkml/2014/2/14/733
> 
> I'm running into a very similar issue on vanilla 3.14.4 and 3.15-rc5, both appear to have that patch
already applied.
> 
> I've tested ext4, ext3, btrfs, all with the same issue: processes writing to disk in the guest randomly
hang permanently after a few minutes of uptime. The guest reports 100%
> iowait, the host has no load and is totally fine.

Can you share your UML disk image?
Maybe your userspace triggers some odds.
What distro is it?

Does it only happen with ubd disks?
IOW does NFS or hostfs work?

Thanks,
//richard

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Luis Henriques | 10 Dec 15:29 2013

[3.5.y.z extended stable] Patch "um: add missing declaration of 'getrlimit()' and friends" has been added to staging queue

This is a note to let you know that I have just added a patch titled

    um: add missing declaration of 'getrlimit()' and friends

to the linux-3.5.y-queue branch of the 3.5.y.z extended stable tree 
which can be found at:

 http://kernel.ubuntu.com/git?p=ubuntu/linux.git;a=shortlog;h=refs/heads/linux-3.5.y-queue

If you, or anyone else, feels it should not be added to this tree, please 
reply to this email.

For more information about the 3.5.y.z tree, see
https://wiki.ubuntu.com/Kernel/Dev/ExtendedStable

Thanks.
-Luis

------

From e79e33d9a4e1a528efc11b7cc3d5eba0871451f8 Mon Sep 17 00:00:00 2001
From: Sergei Trofimovich <slyfox <at> gentoo.org>
Date: Sun, 30 Dec 2012 01:37:30 +0300
Subject: um: add missing declaration of 'getrlimit()' and friends

commit fdfa4c952844fce881df8c76de9c7180cbe913ab upstream.

arch/um/os-Linux/start_up.c: In function 'check_coredump_limit':
arch/um/os-Linux/start_up.c:338:16: error: storage size of 'lim' isn't known
arch/um/os-Linux/start_up.c:339:2: error: implicit declaration of function 'getrlimit' [-Werror=implicit-function-declaration]

Signed-off-by: Sergei Trofimovich <slyfox <at> gentoo.org>
CC: Jeff Dike <jdike <at> addtoit.com>
CC: Richard Weinberger <richard <at> nod.at>
CC: Al Viro <viro <at> zeniv.linux.org.uk>
CC: user-mode-linux-devel <at> lists.sourceforge.net
CC: user-mode-linux-user <at> lists.sourceforge.net
CC: linux-kernel <at> vger.kernel.org
Signed-off-by: Richard Weinberger <richard <at> nod.at>
Signed-off-by: Luis Henriques <luis.henriques <at> canonical.com>
---
 arch/um/os-Linux/start_up.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/arch/um/os-Linux/start_up.c b/arch/um/os-Linux/start_up.c
index 425162e..2f53b89 100644
--- a/arch/um/os-Linux/start_up.c
+++ b/arch/um/os-Linux/start_up.c
 <at>  <at>  -15,6 +15,8  <at>  <at> 
 #include <sys/mman.h>
 #include <sys/stat.h>
 #include <sys/wait.h>
+#include <sys/time.h>
+#include <sys/resource.h>
 #include <asm/unistd.h>
 #include "init.h"
 #include "os.h"
--
1.8.3.2

Tamil Mani | 21 Nov 13:00 2013
Picon

Re: [uml-user] Building UML with busybox as root file system

thank you. got it :)


On Tue, Nov 19, 2013 at 8:58 PM, Teto <mattator <at> gmail.com> wrote:

Have you tried setting your init to the busybox binary ? try adding
"init=<pathToBusyboxInYourFileSystem>" o nthe command line

2013/11/19 Tamil Mani <rf.tamilmani <at> gmail.com>:
> Hi ,
> I downloaded the latest version of linux-3.11.8 ,configured it as UML and
> got the statically compiled binary (linux).
>
> Then i downloaded the latest busybox 1.21.1 and compiled with default
> configuration. Then i converted the busybox binary into a  ext4 filesystem.
>
> while running linux as UML,
>
> ./linux ubda=./busybox mem=128M
>
> i'm getting the following error
>
>  EXT4-fs (ubda): mounted filesystem with ordered data mode. Opts: (null)
> [    1.170000] VFS: Mounted root (ext4 filesystem) readonly on device 98:0.
> [    1.170000] Kernel panic - not syncing: No init found.  Try passing init=
> option to kernel. See Linux Documentation/init.txt for guidance.
> [    1.170000] CPU: 0 PID: 1 Comm: swapper Not tainted 3.11.8 #6
> [    1.170000] 67c3fe78 67c3feb0 60058699 6004c888 60600531 00000000
> 00000000 67c3fec0
> [    1.170000]        604f6fe3 67c3ffc0 604f1e3b 00000000 3000000008
> 67c3ffd0 67c3fef0 657fe900
> [    1.170000]        6004c888 00000f76 6004c888 00000003 67c3fe40 60600529
> fffffffe 67c3ffa0
> [    1.170000] Call Trace:
> [    1.170000] 67c3fe88:  [<60058699>] dump_stack_print_info+0xa5/0xae
> [    1.170000] 67c3fe90:  [<6004c888>] put_cred_rcu+0x0/0xa4
> [    1.170000] 67c3feb8:  [<604f6fe3>] dump_stack+0x17/0x19
> [    1.170000] 67c3fec8:  [<604f1e3b>] panic+0xf7/0x1ee
> [    1.170000] 67c3fef8:  [<6004c888>] put_cred_rcu+0x0/0xa4
> [    1.170000] 67c3ff08:  [<6004c888>] put_cred_rcu+0x0/0xa4
> [    1.170000] 67c3ff38:  [<600ac7ce>] do_execve_common+0x49b/0x4f0
> [    1.170000] 67c3ff48:  [<6004d600>]
> async_synchronize_cookie_domain+0x56/0x112
> [    1.170000] 67c3ffc8:  [<604f0c88>] kernel_init+0xb6/0xba
> [    1.170000] 67c3ffd8:  [<6001c374>] new_thread_handler+0x7a/0x95
> [    1.170000]
> [    1.170000]
> [    1.170000] Modules linked in:
> [    1.170000] Pid: 1, comm: swapper Not tainted 3.11.8
> [    1.170000] RIP: 0033:[<000000006048c0a7>]
> [    1.170000] RSP: 00007fff11356248  EFLAGS: 00000246
> [    1.170000] RAX: 0000000000000000 RBX: 00000000000048ec RCX:
> ffffffffffffffff
> [    1.170000] RDX: 0000000000000000 RSI: 0000000000000013 RDI:
> 00000000000048ec
> [    1.170000] RBP: 00007fff11356270 R08: 0000000000000000 R09:
> 00007fff11356270
> [    1.170000] R10: 0000000000000000 R11: 0000000000000246 R12:
> 00000000000048e8
> [    1.170000] R13: 00007fff11356458 R14: 00007fff11356e3a R15:
> 0000000000000007
> [    1.170000] Call Trace:
> [    1.170000] 67c3fe38:  [<6001d2f6>] show_trace+0x8e/0x95
> [    1.170000] 67c3fe48:  [<6001e808>] panic_exit+0x2b/0x41
> [    1.170000] 67c3fe68:  [<6004c298>] notifier_call_chain+0x32/0x5c
> [    1.170000] 67c3fea8:  [<6004c2cb>] __atomic_notifier_call_chain+0x9/0xb
> [    1.170000] 67c3feb8:  [<6004c2dc>] atomic_notifier_call_chain+0xf/0x11
> [    1.170000] 67c3fec8:  [<604f1e56>] panic+0x112/0x1ee
> [    1.170000] 67c3fef8:  [<6004c888>] put_cred_rcu+0x0/0xa4
> [    1.170000] 67c3ff08:  [<6004c888>] put_cred_rcu+0x0/0xa4
> [    1.170000] 67c3ff38:  [<600ac7ce>] do_execve_common+0x49b/0x4f0
> [    1.170000] 67c3ff48:  [<6004d600>]
> async_synchronize_cookie_domain+0x56/0x112
> [    1.170000] 67c3ffc8:  [<604f0c88>] kernel_init+0xb6/0xba
> [    1.170000] 67c3ffd8:  [<6001c374>] new_thread_handler+0x7a/0x95
> [    1.170000]
> Aborted
>
> To summarize,i'm getting a kernel panic due to the missing of init. Please
> help me in fixing the problem
>
> Thanks & regards,
> Tamil
>
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Tamil Mani | 19 Nov 11:23 2013
Picon

[uml-user] Building UML with busybox as root file system

Hi ,
I downloaded the latest version of linux-3.11.8 ,configured it as UML and got the statically compiled binary (linux).

Then i downloaded the latest busybox 1.21.1 and compiled with default configuration. Then i converted the busybox binary into a  ext4 filesystem.

while running linux as UML,

./linux ubda=./busybox mem=128M

i'm getting the following error

 EXT4-fs (ubda): mounted filesystem with ordered data mode. Opts: (null)
[    1.170000] VFS: Mounted root (ext4 filesystem) readonly on device 98:0.
[    1.170000] Kernel panic - not syncing: No init found.  Try passing init= option to kernel. See Linux Documentation/init.txt for guidance.
[    1.170000] CPU: 0 PID: 1 Comm: swapper Not tainted 3.11.8 #6
[    1.170000] 67c3fe78 67c3feb0 60058699 6004c888 60600531 00000000 00000000 67c3fec0
[    1.170000]        604f6fe3 67c3ffc0 604f1e3b 00000000 3000000008 67c3ffd0 67c3fef0 657fe900
[    1.170000]        6004c888 00000f76 6004c888 00000003 67c3fe40 60600529 fffffffe 67c3ffa0
[    1.170000] Call Trace:
[    1.170000] 67c3fe88:  [<60058699>] dump_stack_print_info+0xa5/0xae
[    1.170000] 67c3fe90:  [<6004c888>] put_cred_rcu+0x0/0xa4
[    1.170000] 67c3feb8:  [<604f6fe3>] dump_stack+0x17/0x19
[    1.170000] 67c3fec8:  [<604f1e3b>] panic+0xf7/0x1ee
[    1.170000] 67c3fef8:  [<6004c888>] put_cred_rcu+0x0/0xa4
[    1.170000] 67c3ff08:  [<6004c888>] put_cred_rcu+0x0/0xa4
[    1.170000] 67c3ff38:  [<600ac7ce>] do_execve_common+0x49b/0x4f0
[    1.170000] 67c3ff48:  [<6004d600>] async_synchronize_cookie_domain+0x56/0x112
[    1.170000] 67c3ffc8:  [<604f0c88>] kernel_init+0xb6/0xba
[    1.170000] 67c3ffd8:  [<6001c374>] new_thread_handler+0x7a/0x95
[    1.170000]
[    1.170000]
[    1.170000] Modules linked in:
[    1.170000] Pid: 1, comm: swapper Not tainted 3.11.8
[    1.170000] RIP: 0033:[<000000006048c0a7>]
[    1.170000] RSP: 00007fff11356248  EFLAGS: 00000246
[    1.170000] RAX: 0000000000000000 RBX: 00000000000048ec RCX: ffffffffffffffff
[    1.170000] RDX: 0000000000000000 RSI: 0000000000000013 RDI: 00000000000048ec
[    1.170000] RBP: 00007fff11356270 R08: 0000000000000000 R09: 00007fff11356270
[    1.170000] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000000048e8
[    1.170000] R13: 00007fff11356458 R14: 00007fff11356e3a R15: 0000000000000007
[    1.170000] Call Trace:
[    1.170000] 67c3fe38:  [<6001d2f6>] show_trace+0x8e/0x95
[    1.170000] 67c3fe48:  [<6001e808>] panic_exit+0x2b/0x41
[    1.170000] 67c3fe68:  [<6004c298>] notifier_call_chain+0x32/0x5c
[    1.170000] 67c3fea8:  [<6004c2cb>] __atomic_notifier_call_chain+0x9/0xb
[    1.170000] 67c3feb8:  [<6004c2dc>] atomic_notifier_call_chain+0xf/0x11
[    1.170000] 67c3fec8:  [<604f1e56>] panic+0x112/0x1ee
[    1.170000] 67c3fef8:  [<6004c888>] put_cred_rcu+0x0/0xa4
[    1.170000] 67c3ff08:  [<6004c888>] put_cred_rcu+0x0/0xa4
[    1.170000] 67c3ff38:  [<600ac7ce>] do_execve_common+0x49b/0x4f0
[    1.170000] 67c3ff48:  [<6004d600>] async_synchronize_cookie_domain+0x56/0x112
[    1.170000] 67c3ffc8:  [<604f0c88>] kernel_init+0xb6/0xba
[    1.170000] 67c3ffd8:  [<6001c374>] new_thread_handler+0x7a/0x95
[    1.170000]
Aborted

To summarize,i'm getting a kernel panic due to the missing of init. Please help me in fixing the problem

Thanks & regards,
Tamil
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