Re: [uml-devel] negative pid -516 possible ?
-BEGIN PGP SIGNED MESSAGE-
Hash: SHA256
On 01/13/2014 08:54 PM, Toralf Förster wrote:
On 01/13/2014 12:21 AM, Richard Weinberger wrote:
On Sat, Jan 11, 2014 at 11:47 AM, Toralf Förster toralf.foers...@gmx.de
wrote:
I do fuzz testing with trinity (latest git version) a stable 32 bit Gentoo
Linux user mode linux image.
The host is a stable 32 bit vanilla 3.12.7 kernel, the guest runs latest git
tree + 2 patches (attached).
The trinity call in the UML guest is :
$ trinity -q -l off -N 1 -C 2 -x move_pages -x mremap -v /mnt/ramdisk
After a while there's no progress on the command line seen at the host
system - the trinity process seems to just hangs/idling. When this does
occur I cannot longer ssh into the system. The system however runs
furthermore. In another terminal I still see the output of this command:
Does it consume 100% CPU?
No.
It just doesnt allow new ssh connections. Existing ssh conenctinos are still
working.
$ ssh root@trinity tail -f /var/log/messages
That's why I do know that the system does not hang completely. The output of
top at the host system gives me the pid of the linux exe. A gdb call gives
for that pid :
$ date; sudo gdb /home/tfoerste/devel/linux/linux 25224 -n -batch -ex 'bt
full'
Sat Jan 11 11:36:47 CET 2014
warning: Could not load shared library symbols for linux-gate.so.1.
Do you need set solib-search-path or set sysroot?
0xb7800424 in __kernel_vsyscall ()
#0 0xb7800424 in __kernel_vsyscall ()
No symbol table info available.
#1 0x083d63ff in __nanosleep_nocancel ()
No symbol table info available.
#2 0x0807266c in idle_sleep (nsecs=602496380195307520) at
arch/um/os-Linux/time.c:183
ts = {tv_sec = 0, tv_nsec = 8436602}
#3 0x0805fc0f in arch_cpu_idle () at arch/um/kernel/process.c:208
No locals.
#4 0x080a8971 in cpu_idle_loop () at kernel/cpu/idle.c:98
No locals.
#5 cpu_startup_entry (state=CPUHP_ONLINE) at kernel/cpu/idle.c:140
No locals.
#6 0x084215e9 in rest_init () at init/main.c:402
pid = -516
__func__ = rest_init
#7 0x080487e1 in start_kernel () at init/main.c:656
command_line = 0x85b8400 command_line earlyprintk
ubda=/home/tfoerste/virtual/uml/trinity ubdb=/mnt/ramdisk/trinity_swap
eth0=tuntap,tap0,72:ef:3d:9f:c3:5a mem=1025M con0=fd:0,fd:1 con=pts
rootfstype=ext4 root=98:0
#8 0x08049e42 in start_kernel_proc (unused=0x0) at
arch/um/kernel/skas/process.c:48
pid = -516
__func__ = start_kernel_proc
#9 0x0805f7cb in new_thread_handler () at arch/um/kernel/process.c:129
fn = 0x0
#10 0x in ?? ()
No symbol table info available.
Please note that BUG_ON was not triggered. For completeness here are the gdb
traces from all linux processes currently running at the host:
So let's forget the 516 issue for now.
What we no for now is that you manage to trigger a lockup within UML.
Agreed, especially b/c I added this patch too :
$ cat ~/devel/priv/uml/pid516_2.patch
--- init/main.c_orig2014-01-12 16:43:48.585439158 +0100
+++ init/main.c 2014-01-12 16:44:01.706438453 +0100
@@ -389,6 +389,7 @@
BUG_ON(pid == -516);
rcu_read_lock();
kthreadd_task = find_task_by_pid_ns(pid, init_pid_ns);
+ BUG_ON(pid == -516);
rcu_read_unlock();
complete(kthreadd_done);
and this wasn't triggered (/me wonders if the -516 is somehow garbage).
But I can narrow down the problem. In an still open ssh sessions I made :
$ lsof | grep t3
bash 6129 tfoerste cwd DIR 98,0 4096734
/home/tfoerste/t3
logger6135 tfoerste cwd DIR 98,0 4096734
/home/tfoerste/t3
(t3 is the ~/t3 directory where I cd into it bewfore I run trinity.
And after killing the logger command the trinity batch continues :
$ ps xf -eo pid,start_time,command | grep trinity
6412 20:48 | \_ grep --colour=auto trinity
6129 19:17 \_ bash -c cd ~; sudo su -c 'if [[ -d ./t3 ]]; then sudo
chmod -R a+rwx ./t3; sudo rm -rf ./t3; fi'; mkdir ./t3; cd ./t3; logger
17#-1, M=/mnt/ramdisk; if [[ -n /mnt/ramdisk ]]; then if [[ -d
/mnt/ramdisk/victims/v1 ]]; then sudo chmod -R a+rwx /mnt/ramdisk/victims/v1;
sudo rm -rf /mnt/ramdisk/victims/v1; fi; mkdir -p /mnt/ramdisk/victims/v1/v2;
for i in $(seq -w 0 99); do touch /mnt/ramdisk/victims/v1/v2/f$i 2/dev/null;
mkdir /mnt/ramdisk/victims/v1/v2/d$i 2/dev/null; done; fi; trinity -q -N
1 -C 2 -x move_pages -x mremap -V /mnt/ramdisk/victims/v1/v2
6390 20:46 \_ trinity -q -N 1 -C 2 -x move_pages -x mremap
-V /mnt/ramdisk/victims/v1/v2
6391 20:46 \_ trinity -q -N 1 -C 2 -x move_pages -x
mremap -V /mnt/ramdisk/victims/v1/v2
6392 20:46 \_ trinity -q -N 1 -C 2 -x move_pages -x
mremap -V /mnt/ramdisk/victims/v1/v2
6408 20:47 \_ trinity -q -N 1 -C 2 -x move_pages -x
Re: [uml-devel] negative pid -516 possible ?
-BEGIN PGP SIGNED MESSAGE-
Hash: SHA256
On 01/13/2014 12:21 AM, Richard Weinberger wrote:
On Sat, Jan 11, 2014 at 11:47 AM, Toralf Förster toralf.foers...@gmx.de
wrote:
I do fuzz testing with trinity (latest git version) a stable 32 bit Gentoo
Linux user mode linux image.
The host is a stable 32 bit vanilla 3.12.7 kernel, the guest runs latest git
tree + 2 patches (attached).
The trinity call in the UML guest is :
$ trinity -q -l off -N 1 -C 2 -x move_pages -x mremap -v /mnt/ramdisk
After a while there's no progress on the command line seen at the host system
- the trinity process seems to just hangs/idling. When this does occur I
cannot longer ssh into the system. The system however runs furthermore. In
another terminal I still see the output of this command:
Does it consume 100% CPU?
No.
It just doesnt allow new ssh connections. Existing ssh conenctinos are still
working.
$ ssh root@trinity tail -f /var/log/messages
That's why I do know that the system does not hang completely. The output of
top at the host system gives me the pid of the linux exe. A gdb call gives
for that pid :
$ date; sudo gdb /home/tfoerste/devel/linux/linux 25224 -n -batch -ex 'bt
full'
Sat Jan 11 11:36:47 CET 2014
warning: Could not load shared library symbols for linux-gate.so.1.
Do you need set solib-search-path or set sysroot?
0xb7800424 in __kernel_vsyscall ()
#0 0xb7800424 in __kernel_vsyscall ()
No symbol table info available.
#1 0x083d63ff in __nanosleep_nocancel ()
No symbol table info available.
#2 0x0807266c in idle_sleep (nsecs=602496380195307520) at
arch/um/os-Linux/time.c:183
ts = {tv_sec = 0, tv_nsec = 8436602}
#3 0x0805fc0f in arch_cpu_idle () at arch/um/kernel/process.c:208
No locals.
#4 0x080a8971 in cpu_idle_loop () at kernel/cpu/idle.c:98
No locals.
#5 cpu_startup_entry (state=CPUHP_ONLINE) at kernel/cpu/idle.c:140
No locals.
#6 0x084215e9 in rest_init () at init/main.c:402
pid = -516
__func__ = rest_init
#7 0x080487e1 in start_kernel () at init/main.c:656
command_line = 0x85b8400 command_line earlyprintk
ubda=/home/tfoerste/virtual/uml/trinity ubdb=/mnt/ramdisk/trinity_swap
eth0=tuntap,tap0,72:ef:3d:9f:c3:5a mem=1025M con0=fd:0,fd:1 con=pts
rootfstype=ext4 root=98:0
#8 0x08049e42 in start_kernel_proc (unused=0x0) at
arch/um/kernel/skas/process.c:48
pid = -516
__func__ = start_kernel_proc
#9 0x0805f7cb in new_thread_handler () at arch/um/kernel/process.c:129
fn = 0x0
#10 0x in ?? ()
No symbol table info available.
Please note that BUG_ON was not triggered. For completeness here are the gdb
traces from all linux processes currently running at the host:
So let's forget the 516 issue for now.
What we no for now is that you manage to trigger a lockup within UML.
Agreed, especially b/c I added this patch too :
$ cat ~/devel/priv/uml/pid516_2.patch
- --- init/main.c_orig2014-01-12 16:43:48.585439158 +0100
+++ init/main.c 2014-01-12 16:44:01.706438453 +0100
@@ -389,6 +389,7 @@
BUG_ON(pid == -516);
rcu_read_lock();
kthreadd_task = find_task_by_pid_ns(pid, init_pid_ns);
+ BUG_ON(pid == -516);
rcu_read_unlock();
complete(kthreadd_done);
and this wasn't triggered (/me wonders if the -516 is somehow garbage).
But I can narrow down the problem. In an still open ssh sessions I made :
$ lsof | grep t3
bash 6129 tfoerste cwd DIR 98,0 4096734
/home/tfoerste/t3
logger6135 tfoerste cwd DIR 98,0 4096734
/home/tfoerste/t3
(t3 is the ~/t3 directory where I cd into it bewfore I run trinity.
And after killing the logger command the trinity batch continues :
$ ps xf -eo pid,start_time,command | grep trinity
6412 20:48 | \_ grep --colour=auto trinity
6129 19:17 \_ bash -c cd ~; sudo su -c 'if [[ -d ./t3 ]]; then sudo
chmod -R a+rwx ./t3; sudo rm -rf ./t3; fi'; mkdir ./t3; cd ./t3; logger 17#-1,
M=/mnt/ramdisk; if [[ -n /mnt/ramdisk ]]; then if [[ -d
/mnt/ramdisk/victims/v1 ]]; then sudo chmod -R a+rwx /mnt/ramdisk/victims/v1;
sudo rm -rf /mnt/ramdisk/victims/v1; fi; mkdir -p /mnt/ramdisk/victims/v1/v2;
for i in $(seq -w 0 99); do touch /mnt/ramdisk/victims/v1/v2/f$i 2/dev/null;
mkdir /mnt/ramdisk/victims/v1/v2/d$i 2/dev/null; done; fi; trinity -q -N
1 -C 2 -x move_pages -x mremap -V /mnt/ramdisk/victims/v1/v2
6390 20:46 \_ trinity -q -N 1 -C 2 -x move_pages -x mremap -V
/mnt/ramdisk/victims/v1/v2
6391 20:46 \_ trinity -q -N 1 -C 2 -x move_pages -x
mremap -V /mnt/ramdisk/victims/v1/v2
6392 20:46 \_ trinity -q -N 1 -C 2 -x move_pages -x
mremap -V /mnt/ramdisk/victims/v1/v2
6408 20:47 \_ trinity -q -N 1 -C 2 -x move_pages -x
mremap -V /mnt/ramdisk/victims/v1/v2
6410 20:48 \_ trinity -q -N 1 -C
Re: [uml-devel] negative pid -516 possible ?
On Sat, Jan 11, 2014 at 11:47 AM, Toralf Förster toralf.foers...@gmx.de wrote:
-BEGIN PGP SIGNED MESSAGE-
Hash: SHA256
I do fuzz testing with trinity (latest git version) a stable 32 bit Gentoo
Linux user mode linux image.
The host is a stable 32 bit vanilla 3.12.7 kernel, the guest runs latest git
tree + 2 patches (attached).
The trinity call in the UML guest is :
$ trinity -q -l off -N 1 -C 2 -x move_pages -x mremap -v /mnt/ramdisk
After a while there's no progress on the command line seen at the host system
- the trinity process seems to just hangs/idling. When this does occur I
cannot longer ssh into the system. The system however runs furthermore. In
another terminal I still see the output of this command:
Does it consume 100% CPU?
$ ssh root@trinity tail -f /var/log/messages
That's why I do know that the system does not hang completely. The output of
top at the host system gives me the pid of the linux exe. A gdb call gives
for that pid :
$ date; sudo gdb /home/tfoerste/devel/linux/linux 25224 -n -batch -ex 'bt
full'
Sat Jan 11 11:36:47 CET 2014
warning: Could not load shared library symbols for linux-gate.so.1.
Do you need set solib-search-path or set sysroot?
0xb7800424 in __kernel_vsyscall ()
#0 0xb7800424 in __kernel_vsyscall ()
No symbol table info available.
#1 0x083d63ff in __nanosleep_nocancel ()
No symbol table info available.
#2 0x0807266c in idle_sleep (nsecs=602496380195307520) at
arch/um/os-Linux/time.c:183
ts = {tv_sec = 0, tv_nsec = 8436602}
#3 0x0805fc0f in arch_cpu_idle () at arch/um/kernel/process.c:208
No locals.
#4 0x080a8971 in cpu_idle_loop () at kernel/cpu/idle.c:98
No locals.
#5 cpu_startup_entry (state=CPUHP_ONLINE) at kernel/cpu/idle.c:140
No locals.
#6 0x084215e9 in rest_init () at init/main.c:402
pid = -516
__func__ = rest_init
#7 0x080487e1 in start_kernel () at init/main.c:656
command_line = 0x85b8400 command_line earlyprintk
ubda=/home/tfoerste/virtual/uml/trinity ubdb=/mnt/ramdisk/trinity_swap
eth0=tuntap,tap0,72:ef:3d:9f:c3:5a mem=1025M con0=fd:0,fd:1 con=pts
rootfstype=ext4 root=98:0
#8 0x08049e42 in start_kernel_proc (unused=0x0) at
arch/um/kernel/skas/process.c:48
pid = -516
__func__ = start_kernel_proc
#9 0x0805f7cb in new_thread_handler () at arch/um/kernel/process.c:129
fn = 0x0
#10 0x in ?? ()
No symbol table info available.
Please note that BUG_ON was not triggered. For completeness here are the gdb
traces from all linux processes currently running at the host:
So let's forget the 516 issue for now.
What we no for now is that you manage to trigger a lockup within UML.
$ pgrep linux | xargs -n1 -I {} sudo gdb /home/tfoerste/devel/linux/linux {}
-n -batch -ex 'bt'
warning: process 1613 is already traced by process 25224
ptrace: Operation not permitted.
/home/tfoerste/1613: No such file or directory.
No stack.
warning: process 21849 is already traced by process 25224
ptrace: Operation not permitted.
/home/tfoerste/21849: No such file or directory.
No stack.
warning: Could not load shared library symbols for linux-gate.so.1.
Do you need set solib-search-path or set sysroot?
0xb7800424 in __kernel_vsyscall ()
#0 0xb7800424 in __kernel_vsyscall ()
#1 0x083d63ff in __nanosleep_nocancel ()
#2 0x0807266c in idle_sleep (nsecs=602496380205307520) at
arch/um/os-Linux/time.c:183
#3 0x0805fc0f in arch_cpu_idle () at arch/um/kernel/process.c:208
#4 0x080a8971 in cpu_idle_loop () at kernel/cpu/idle.c:98
#5 cpu_startup_entry (state=CPUHP_ONLINE) at kernel/cpu/idle.c:140
#6 0x084215e9 in rest_init () at init/main.c:402
#7 0x080487e1 in start_kernel () at init/main.c:656
#8 0x08049e42 in start_kernel_proc (unused=0x0) at
arch/um/kernel/skas/process.c:48
#9 0x0805f7cb in new_thread_handler () at arch/um/kernel/process.c:129
#10 0x in ?? ()
warning: process 25231 is a cloned process
warning: Could not load shared library symbols for linux-gate.so.1.
Do you need set solib-search-path or set sysroot?
0xb7800424 in __kernel_vsyscall ()
#0 0xb7800424 in __kernel_vsyscall ()
#1 0x083da446 in syscall ()
#2 0x0806e861 in io_getevents (events=optimized out, ctx_id=optimized
out, min_nr=optimized out, nr=optimized out, timeout=optimized out) at
arch/um/os-Linux/aio.c:49
#3 aio_thread (arg=0x0) at arch/um/os-Linux/aio.c:109
#4 0x083db56e in clone ()
warning: process 25232 is a cloned process
warning: Could not load shared library symbols for linux-gate.so.1.
Do you need set solib-search-path or set sysroot?
0xb7800424 in __kernel_vsyscall ()
#0 0xb7800424 in __kernel_vsyscall ()
#1 0x083d82c2 in __read_nocancel ()
#2 0x0806f3ff in read (__nbytes=optimized out, __buf=optimized out,
__fd=optimized out) at /usr/include/bits/unistd.h:44
#3 os_read_file (fd=-512, buf=0xfe00, len=-512) at
arch/um/os-Linux/file.c:253
#4 0x0806bafc in
Re: [uml-devel] negative pid -516 possible ?
-BEGIN PGP SIGNED MESSAGE-
Hash: SHA256
I do fuzz testing with trinity (latest git version) a stable 32 bit Gentoo
Linux user mode linux image.
The host is a stable 32 bit vanilla 3.12.7 kernel, the guest runs latest git
tree + 2 patches (attached).
The trinity call in the UML guest is :
$ trinity -q -l off -N 1 -C 2 -x move_pages -x mremap -v /mnt/ramdisk
After a while there's no progress on the command line seen at the host system -
the trinity process seems to just hangs/idling. When this does occur I cannot
longer ssh into the system. The system however runs furthermore. In another
terminal I still see the output of this command:
$ ssh root@trinity tail -f /var/log/messages
That's why I do know that the system does not hang completely. The output of
top at the host system gives me the pid of the linux exe. A gdb call gives for
that pid :
$ date; sudo gdb /home/tfoerste/devel/linux/linux 25224 -n -batch -ex 'bt full'
Sat Jan 11 11:36:47 CET 2014
warning: Could not load shared library symbols for linux-gate.so.1.
Do you need set solib-search-path or set sysroot?
0xb7800424 in __kernel_vsyscall ()
#0 0xb7800424 in __kernel_vsyscall ()
No symbol table info available.
#1 0x083d63ff in __nanosleep_nocancel ()
No symbol table info available.
#2 0x0807266c in idle_sleep (nsecs=602496380195307520) at
arch/um/os-Linux/time.c:183
ts = {tv_sec = 0, tv_nsec = 8436602}
#3 0x0805fc0f in arch_cpu_idle () at arch/um/kernel/process.c:208
No locals.
#4 0x080a8971 in cpu_idle_loop () at kernel/cpu/idle.c:98
No locals.
#5 cpu_startup_entry (state=CPUHP_ONLINE) at kernel/cpu/idle.c:140
No locals.
#6 0x084215e9 in rest_init () at init/main.c:402
pid = -516
__func__ = rest_init
#7 0x080487e1 in start_kernel () at init/main.c:656
command_line = 0x85b8400 command_line earlyprintk
ubda=/home/tfoerste/virtual/uml/trinity ubdb=/mnt/ramdisk/trinity_swap
eth0=tuntap,tap0,72:ef:3d:9f:c3:5a mem=1025M con0=fd:0,fd:1 con=pts
rootfstype=ext4 root=98:0
#8 0x08049e42 in start_kernel_proc (unused=0x0) at
arch/um/kernel/skas/process.c:48
pid = -516
__func__ = start_kernel_proc
#9 0x0805f7cb in new_thread_handler () at arch/um/kernel/process.c:129
fn = 0x0
#10 0x in ?? ()
No symbol table info available.
Please note that BUG_ON was not triggered. For completeness here are the gdb
traces from all linux processes currently running at the host:
$ pgrep linux | xargs -n1 -I {} sudo gdb /home/tfoerste/devel/linux/linux {} -n
-batch -ex 'bt'
warning: process 1613 is already traced by process 25224
ptrace: Operation not permitted.
/home/tfoerste/1613: No such file or directory.
No stack.
warning: process 21849 is already traced by process 25224
ptrace: Operation not permitted.
/home/tfoerste/21849: No such file or directory.
No stack.
warning: Could not load shared library symbols for linux-gate.so.1.
Do you need set solib-search-path or set sysroot?
0xb7800424 in __kernel_vsyscall ()
#0 0xb7800424 in __kernel_vsyscall ()
#1 0x083d63ff in __nanosleep_nocancel ()
#2 0x0807266c in idle_sleep (nsecs=602496380205307520) at
arch/um/os-Linux/time.c:183
#3 0x0805fc0f in arch_cpu_idle () at arch/um/kernel/process.c:208
#4 0x080a8971 in cpu_idle_loop () at kernel/cpu/idle.c:98
#5 cpu_startup_entry (state=CPUHP_ONLINE) at kernel/cpu/idle.c:140
#6 0x084215e9 in rest_init () at init/main.c:402
#7 0x080487e1 in start_kernel () at init/main.c:656
#8 0x08049e42 in start_kernel_proc (unused=0x0) at
arch/um/kernel/skas/process.c:48
#9 0x0805f7cb in new_thread_handler () at arch/um/kernel/process.c:129
#10 0x in ?? ()
warning: process 25231 is a cloned process
warning: Could not load shared library symbols for linux-gate.so.1.
Do you need set solib-search-path or set sysroot?
0xb7800424 in __kernel_vsyscall ()
#0 0xb7800424 in __kernel_vsyscall ()
#1 0x083da446 in syscall ()
#2 0x0806e861 in io_getevents (events=optimized out, ctx_id=optimized out,
min_nr=optimized out, nr=optimized out, timeout=optimized out) at
arch/um/os-Linux/aio.c:49
#3 aio_thread (arg=0x0) at arch/um/os-Linux/aio.c:109
#4 0x083db56e in clone ()
warning: process 25232 is a cloned process
warning: Could not load shared library symbols for linux-gate.so.1.
Do you need set solib-search-path or set sysroot?
0xb7800424 in __kernel_vsyscall ()
#0 0xb7800424 in __kernel_vsyscall ()
#1 0x083d82c2 in __read_nocancel ()
#2 0x0806f3ff in read (__nbytes=optimized out, __buf=optimized out,
Re: [uml-devel] negative pid -516 possible ?
On Sun, Dec 29, 2013 at 2:14 PM, st...@nixia.no wrote: #6 0x08421d02 in rest_init () at init/main.c:401 pid = -516 #7 0x080487e1 in start_kernel () at init/main.c:655 command_line = 0x85b6400 command_line earlyprintk ubda=/home/tfoerste/virtual/uml/trinity ubdb=/mnt/ramdisk/trinity_swap eth0=tuntap,tap0,72:ef:3d:9f:c3:5a mem=1025M con0=fd:0,fd:1 con=pts rootfstype=ext4 root=98:0 #8 0x08049e09 in start_kernel_proc (unused=0x0) at arch/um/kernel/skas/process.c:46 pid = -516 #9 0x0805f7cb in new_thread_handler () at arch/um/kernel/process.c:129 fn = 0x0 #10 0x in ?? () No symbol table info available. Is this a valid number ? I'm asking b/c there's no process group id 516, and -516 always happens in the back traces. And furthermore after a while the UML system does no longer serve any ssh login attempts. 516 == -ERESTART_RESTARTBLOCK ?? Yeah, maybe. Toralf, where exactly comes this back trace from? gives for a guest is not a good error description. Did it crash and you took it from the core dump? Did it panic() and you attached to it? Did it hang...? IOW don't throw random back traces to us without much details. ;-) The number -516 is a bit odd because you see it in arch/um/kernel/skas/process.c. In that function it comes from os_getpid() which indicates that the host kernel reports that number. ...very strange. init/main.c makes a bit more sense. Maybe a kthread creation within UML returned that internal error. Can you try the attached debug patch? If the BUG_ON() trigger, please show us panic from UML, not just the gdb back trace. -- Thanks, //richard diff --git a/arch/um/kernel/skas/process.c b/arch/um/kernel/skas/process.c index 4da11b3..71a5828 100644 --- a/arch/um/kernel/skas/process.c +++ b/arch/um/kernel/skas/process.c @@ -38,6 +38,8 @@ static int __init start_kernel_proc(void *unused) block_signals(); pid = os_getpid(); + BUG_ON(pid == -516); + cpu_tasks[0].pid = pid; cpu_tasks[0].task = current; #ifdef CONFIG_SMP diff --git a/init/main.c b/init/main.c index febc511..9ad68ab 100644 --- a/init/main.c +++ b/init/main.c @@ -386,6 +386,7 @@ static noinline void __init_refok rest_init(void) kernel_thread(kernel_init, NULL, CLONE_FS | CLONE_SIGHAND); numa_default_policy(); pid = kernel_thread(kthreadd, NULL, CLONE_FS | CLONE_FILES); + BUG_ON(pid == -516); rcu_read_lock(); kthreadd_task = find_task_by_pid_ns(pid, init_pid_ns); rcu_read_unlock(); -- Rapidly troubleshoot problems before they affect your business. Most IT organizations don't have a clear picture of how application performance affects their revenue. With AppDynamics, you get 100% visibility into your Java,.NET, PHP application. Start your 15-day FREE TRIAL of AppDynamics Pro! http://pubads.g.doubleclick.net/gampad/clk?id=84349831iu=/4140/ostg.clktrk___ User-mode-linux-devel mailing list User-mode-linux-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/user-mode-linux-devel
Re: [uml-devel] negative pid -516 possible ?
-BEGIN PGP SIGNED MESSAGE-
Hash: SHA256
On 12/21/2013 03:36 PM, Toralf Förster wrote:
Trinity'ing a 32 bit linux user mode linux (still the raid x tree issue )
gives for a guest :
tfoerste@n22 ~ $ date; sudo gdb /home/tfoerste/devel/linux/linux 10044 -n
-batch -ex 'bt full'
Sat Dec 21 15:33:03 CET 2013
0xb7710424 in __kernel_vsyscall ()
#0 0xb7710424 in __kernel_vsyscall ()
No symbol table info available.
#1 0x083d5d2f in __nanosleep_nocancel ()
No symbol table info available.
#2 0x0807267c in idle_sleep (nsecs=602496466104653440) at
arch/um/os-Linux/time.c:183
ts = {tv_sec = 0, tv_nsec = 6471789}
#3 0x0805fc0f in arch_cpu_idle () at arch/um/kernel/process.c:208
No locals.
#4 0x080a8981 in cpu_idle_loop () at kernel/cpu/idle.c:98
No locals.
#5 cpu_startup_entry (state=CPUHP_ONLINE) at kernel/cpu/idle.c:140
No locals.
#6 0x08421d02 in rest_init () at init/main.c:401
pid = -516
#7 0x080487e1 in start_kernel () at init/main.c:655
command_line = 0x85b6400 command_line earlyprintk
ubda=/home/tfoerste/virtual/uml/trinity ubdb=/mnt/ramdisk/trinity_swap
eth0=tuntap,tap0,72:ef:3d:9f:c3:5a mem=1025M con0=fd:0,fd:1 con=pts
rootfstype=ext4 root=98:0
#8 0x08049e09 in start_kernel_proc (unused=0x0) at
arch/um/kernel/skas/process.c:46
pid = -516
#9 0x0805f7cb in new_thread_handler () at arch/um/kernel/process.c:129
fn = 0x0
#10 0x in ?? ()
No symbol table info available.
Is this a valid number ?
I'm asking b/c there's no process group id 516, and -516 always happens in the
back traces.
And furthermore after a while the UML system does no longer serve any ssh login
attempts.
- --
MfG/Sincerely
Toralf Förster
pgp finger print:1A37 6F99 4A9D 026F 13E2 4DCF C4EA CDDE 0076 E94E
-BEGIN PGP SIGNATURE-
Version: GnuPG v2.0.22 (GNU/Linux)
Comment: Using GnuPG with Thunderbird - http://www.enigmail.net/
iF4EAREIAAYFAlLAGzwACgkQxOrN3gB26U4GaAD+J/AW3LTgeooTehy4vIw1QQO4
o1m6w/3Isy4JhVE/GBQA/AqqqNeuLRJsXrG0i3NpRiD9IpAiXbzieDaFQFOncGe5
=7Bs6
-END PGP SIGNATURE-
--
Rapidly troubleshoot problems before they affect your business. Most IT
organizations don't have a clear picture of how application performance
affects their revenue. With AppDynamics, you get 100% visibility into your
Java,.NET, PHP application. Start your 15-day FREE TRIAL of AppDynamics Pro!
http://pubads.g.doubleclick.net/gampad/clk?id=84349831iu=/4140/ostg.clktrk
___
User-mode-linux-devel mailing list
User-mode-linux-devel@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/user-mode-linux-devel
Re: [uml-devel] negative pid -516 possible ?
#6 0x08421d02 in rest_init () at init/main.c:401 pid = -516 #7 0x080487e1 in start_kernel () at init/main.c:655 command_line = 0x85b6400 command_line earlyprintk ubda=/home/tfoerste/virtual/uml/trinity ubdb=/mnt/ramdisk/trinity_swap eth0=tuntap,tap0,72:ef:3d:9f:c3:5a mem=1025M con0=fd:0,fd:1 con=pts rootfstype=ext4 root=98:0 #8 0x08049e09 in start_kernel_proc (unused=0x0) at arch/um/kernel/skas/process.c:46 pid = -516 #9 0x0805f7cb in new_thread_handler () at arch/um/kernel/process.c:129 fn = 0x0 #10 0x in ?? () No symbol table info available. Is this a valid number ? I'm asking b/c there's no process group id 516, and -516 always happens in the back traces. And furthermore after a while the UML system does no longer serve any ssh login attempts. 516 == -ERESTART_RESTARTBLOCK ?? Stian -- Rapidly troubleshoot problems before they affect your business. Most IT organizations don't have a clear picture of how application performance affects their revenue. With AppDynamics, you get 100% visibility into your Java,.NET, PHP application. Start your 15-day FREE TRIAL of AppDynamics Pro! http://pubads.g.doubleclick.net/gampad/clk?id=84349831iu=/4140/ostg.clktrk ___ User-mode-linux-devel mailing list User-mode-linux-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/user-mode-linux-devel
