Bug#872926: sysstat: running sadc results in segmentation fault
On 08/22/2017 03:09 PM, Robert Luberda wrote:
> Jamie McClelland writes:
>
>> I started getting email messages from the sysstat cron job reporting the
>> segmentation fault.
>
> When did you start receiving those e-mails? Just after upgrade systat to
> 11.5.7 or later i.e. did version 11.5.7 work, but then stopped for some
> reason?
I upgraded to 11.5.7 on July 25, 2017 - and the errors started August
20th. So - I don't think it is related to that upgrade.
However, the problem does seem to correlate with my use of the overlay2
filesystem with docker - perhaps that is the clue? The mtab file
contains a lot of lines related to overlay2 and docker.
>> Here's an strace:
>>
>> open("/etc/mtab", O_RDONLY) = 3
>> fstat(3, {st_mode=S_IFREG|0444, st_size=0, ...}) = 0
>> read(3, "sysfs /sys sysfs rw,nosuid,nodev"..., 1024) = 1024
>> [...]
>> statfs("0", 0x7ffef1ab0890) = -1 ENOENT (No such file or
>> directory)
>> read(3, "y2/l/7EEOV2FTKYKCYQJPMOALKJSL3M:"..., 1024) = 1024
>> --- SIGSEGV {si_signo=SIGSEGV, si_code=SEGV_MAPERR, si_addr=0x1} ---
>
> Looks like the last file read was /etc/mtab (which should be a symlink
> to /proc/self/mtab). Even though the beginning of the file looks pretty
> usual, then something in this file causes sadc to crash.
>
> Could you please send the contents of the /etc/mtab file, especially the
> lines around the "y2/l/7EEOV2FTKYKCYQJPMOALKJSL3M" string? In case it
> contain data you don't want to share into public, e.g. server names or
> paths on remote servers, please obfuscate it.
Attached.
Thanks for your help!
jamie
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sysfs /sys sysfs rw,nosuid,nodev,noexec,relatime 0 0
proc /proc proc rw,relatime 0 0
udev /dev devtmpfs rw,nosuid,relatime,size=8162252k,nr_inodes=2040563,mode=755
0 0
devpts /dev/pts devpts rw,nosuid,noexec,relatime,gid=5,mode=620,ptmxmode=000 0 0
tmpfs /run tmpfs rw,nosuid,noexec,relatime,size=1635072k,mode=755 0 0
/dev/mapper/vg_turkey0-root / ext4 rw,relatime,errors=remount-ro,data=ordered 0 0
securityfs /sys/kernel/security securityfs rw,nosuid,nodev,noexec,relatime 0 0
tmpfs /dev/shm tmpfs rw,nosuid,nodev 0 0
tmpfs /run/lock tmpfs rw,nosuid,nodev,noexec,relatime,size=5120k 0 0
tmpfs /sys/fs/cgroup tmpfs ro,nosuid,nodev,noexec,mode=755 0 0
cgroup /sys/fs/cgroup/systemd cgroup
rw,nosuid,nodev,noexec,relatime,xattr,release_agent=/lib/systemd/systemd-cgroups-agent,name=systemd
0 0
pstore /sys/fs/pstore pstore rw,nosuid,nodev,noexec,relatime 0 0
cgroup /sys/fs/cgroup/cpuset cgroup rw,nosuid,nodev,noexec,relatime,cpuset 0 0
cgroup /sys/fs/cgroup/pids cgroup rw,nosuid,nodev,noexec,relatime,pids 0 0
cgroup /sys/fs/cgroup/blkio cgroup rw,nosuid,nodev,noexec,relatime,blkio 0 0
cgroup /sys/fs/cgroup/net_cls,net_prio cgroup
rw,nosuid,nodev,noexec,relatime,net_cls,net_prio 0 0
cgroup /sys/fs/cgroup/devices cgroup rw,nosuid,nodev,noexec,relatime,devices 0 0
cgroup /sys/fs/cgroup/freezer cgroup rw,nosuid,nodev,noexec,relatime,freezer 0 0
cgroup /sys/fs/cgroup/perf_event cgroup
rw,nosuid,nodev,noexec,relatime,perf_event 0 0
cgroup /sys/fs/cgroup/cpu,cpuacct cgroup
rw,nosuid,nodev,noexec,relatime,cpu,cpuacct 0 0
cgroup /sys/fs/cgroup/memory cgroup rw,nosuid,nodev,noexec,relatime,memory 0 0
systemd-1 /proc/sys/fs/binfmt_misc autofs
rw,relatime,fd=35,pgrp=1,timeout=0,minproto=5,maxproto=5,direct,pipe_ino=12886
0 0
mqueue /dev/mqueue mqueue rw,relatime 0 0
hugetlbfs /dev/hugepages hugetlbfs rw,relatime 0 0
debugfs /sys/kernel/debug debugfs rw,relatime 0 0
tmpfs /tmp tmpfs rw,relatime 0 0
/dev/mapper/vg_turkey0-var /var ext4 rw,relatime,data=ordered 0 0
/dev/sda3 /boot ext4 rw,relatime,data=ordered 0 0
/dev/mapper/vg_turkey0-srv /srv ext4 rw,relatime,data=ordered 0 0
tmpfs /var/tmp tmpfs rw,relatime 0 0
/dev/mapper/vg_turkey0-docker /var/lib/docker ext4 rw,relatime,data=ordered 0 0
/dev/mapper/vg_turkey0-home /home ext4 rw,relatime,data=ordered 0 0
binfmt_misc /proc/sys/fs/binfmt_misc binfmt_misc rw,relatime 0 0
tmpfs /run/user/1000 tmpfs
rw,nosuid,nodev,relatime,size=1635072k,mode=700,uid=1000,gid=1000 0 0
/dev/mapper/vg_turkey0-docker /var/lib/docker/overlay2 ext4
rw,relatime,data=ordered 0 0
overlay
/var/lib/docker/overlay2/65da4a2286836f893462520d010450995d988c421437124fad9f486dc2d9d82f/merged
overlay
rw,relatime,lowerdir=/var/lib/docker/overlay2/l/NMYHQQQA4WXMLIPCAPGXLUDSDM:/var/lib/docker/overlay2/l/H5R6F5HP3R3SCZZG4A4MYHDX3I:/var/lib/docker/overlay2/l/IIY7KSCIDGMMF4SNSGFA347DNX:/var/lib/docker/overlay2/l/AVNFGYK4HWNLWVOWUWJ4RZO5LW:/var/lib/docker/overlay2/l/MHQ6VBITNXP6HB52UVJIDJBRWF,upperdir=/var/lib/docker/overlay2/65da4a2286836f893462520d010450995d988c421437124fad9f486dc2d9d82f/diff,workdir=/var/lib/docker/overlay2/65da4a2286836f893462520d010450995d988c421437124fad9f486dc2d9d82f/work
0 0
shm
Bug#872926: sysstat: running sadc results in segmentation fault
Jamie McClelland writes:
> I started getting email messages from the sysstat cron job reporting the
> segmentation fault.
When did you start receiving those e-mails? Just after upgrade systat to
11.5.7 or later i.e. did version 11.5.7 work, but then stopped for some
reason?
>
> root@turkey:~# /usr/lib/sysstat/sadc -F -L -S DISK 1 1 /var/log/sysstat
> Segmentation fault
> root@turkey:~#
>
> Here's an strace:
>
> open("/etc/mtab", O_RDONLY) = 3
> fstat(3, {st_mode=S_IFREG|0444, st_size=0, ...}) = 0
> read(3, "sysfs /sys sysfs rw,nosuid,nodev"..., 1024) = 1024
> [...]
> statfs("0", 0x7ffef1ab0890) = -1 ENOENT (No such file or
> directory)
> read(3, "y2/l/7EEOV2FTKYKCYQJPMOALKJSL3M:"..., 1024) = 1024
> --- SIGSEGV {si_signo=SIGSEGV, si_code=SEGV_MAPERR, si_addr=0x1} ---
Looks like the last file read was /etc/mtab (which should be a symlink
to /proc/self/mtab). Even though the beginning of the file looks pretty
usual, then something in this file causes sadc to crash.
Could you please send the contents of the /etc/mtab file, especially the
lines around the "y2/l/7EEOV2FTKYKCYQJPMOALKJSL3M" string? In case it
contain data you don't want to share into public, e.g. server names or
paths on remote servers, please obfuscate it.
Thanks a lot,
robert
Bug#872926: sysstat: running sadc results in segmentation fault
Package: sysstat
Version: 11.5.7-1
Severity: important
Dear Maintainer,
*** Reporter, please consider answering these questions, where appropriate ***
I started getting email messages from the sysstat cron job reporting the
segmentation fault.
I then tried to run the command manually and also get a segmentation
fault:
root@turkey:~# /usr/lib/sysstat/sadc -F -L -S DISK 1 1 /var/log/sysstat
Segmentation fault
root@turkey:~#
Here's an strace:
execve("/usr/lib/sysstat/sadc", ["/usr/lib/sysstat/sadc", "-F", "-L", "-S",
"DISK", "1", "1", "/var/log/sysstat"], [/* 23 vars */]) = 0
brk(NULL) = 0x5607e0014000
access("/etc/ld.so.nohwcap", F_OK) = -1 ENOENT (No such file or directory)
mmap(NULL, 12288, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) =
0x7fc14cc69000
access("/etc/ld.so.preload", R_OK) = 0
open("/etc/ld.so.preload", O_RDONLY|O_CLOEXEC) = 3
fstat(3, {st_mode=S_IFREG|0644, st_size=0, ...}) = 0
close(3)= 0
open("/etc/ld.so.cache", O_RDONLY|O_CLOEXEC) = 3
fstat(3, {st_mode=S_IFREG|0644, st_size=170401, ...}) = 0
mmap(NULL, 170401, PROT_READ, MAP_PRIVATE, 3, 0) = 0x7fc14cc3f000
close(3)= 0
access("/etc/ld.so.nohwcap", F_OK) = -1 ENOENT (No such file or directory)
open("/usr/lib/x86_64-linux-gnu/libsensors.so.4", O_RDONLY|O_CLOEXEC) = 3
read(3, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0\20%\0\0\0\0\0\0"...,
832) = 832
fstat(3, {st_mode=S_IFREG|0644, st_size=59872, ...}) = 0
mmap(NULL, 2155592, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) =
0x7fc14c83a000
mprotect(0x7fc14c848000, 2093056, PROT_NONE) = 0
mmap(0x7fc14ca47000, 8192, PROT_READ|PROT_WRITE,
MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0xd000) = 0x7fc14ca47000
close(3)= 0
access("/etc/ld.so.nohwcap", F_OK) = -1 ENOENT (No such file or directory)
open("/lib/x86_64-linux-gnu/libc.so.6", O_RDONLY|O_CLOEXEC) = 3
read(3, "\177ELF\2\1\1\3\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0\0\4\2\0\0\0\0\0"...,
832) = 832
fstat(3, {st_mode=S_IFREG|0755, st_size=1681176, ...}) = 0
mmap(NULL, 3787104, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) =
0x7fc14c49d000
mprotect(0x7fc14c63, 2097152, PROT_NONE) = 0
mmap(0x7fc14c83, 24576, PROT_READ|PROT_WRITE,
MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x193000) = 0x7fc14c83
mmap(0x7fc14c836000, 14688, PROT_READ|PROT_WRITE,
MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x7fc14c836000
close(3)= 0
access("/etc/ld.so.nohwcap", F_OK) = -1 ENOENT (No such file or directory)
open("/lib/x86_64-linux-gnu/libm.so.6", O_RDONLY|O_CLOEXEC) = 3
read(3, "\177ELF\2\1\1\3\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0\200V\0\0\0\0\0\0"...,
832) = 832
fstat(3, {st_mode=S_IFREG|0644, st_size=1063328, ...}) = 0
mmap(NULL, 3158248, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) =
0x7fc14c199000
mprotect(0x7fc14c29c000, 2093056, PROT_NONE) = 0
mmap(0x7fc14c49b000, 8192, PROT_READ|PROT_WRITE,
MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x102000) = 0x7fc14c49b000
close(3)= 0
mmap(NULL, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) =
0x7fc14cc3d000
arch_prctl(ARCH_SET_FS, 0x7fc14cc3d700) = 0
mprotect(0x7fc14c83, 16384, PROT_READ) = 0
mprotect(0x7fc14c49b000, 4096, PROT_READ) = 0
mprotect(0x7fc14ca47000, 4096, PROT_READ) = 0
mprotect(0x5607df6b4000, 4096, PROT_READ) = 0
mprotect(0x7fc14cc6c000, 4096, PROT_READ) = 0
munmap(0x7fc14cc3f000, 170401) = 0
statfs("/sys", {f_type=SYSFS_MAGIC, f_bsize=4096, f_blocks=0, f_bfree=0,
f_bavail=0, f_files=0, f_ffree=0, f_fsid={val=[0, 0]}, f_namelen=255,
f_frsize=4096, f_flags=ST_VALID|ST_NOSUID|ST_NODEV|ST_NOEXEC|ST_RELATIME}) = 0
open("/sys/class/i2c-adapter", O_RDONLY|O_NONBLOCK|O_DIRECTORY|O_CLOEXEC) = 3
fstat(3, {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
brk(NULL) = 0x5607e0014000
brk(0x5607e003d000) = 0x5607e003d000
getdents(3, /* 11 entries */, 32768)= 336
open("/sys/class/i2c-adapter/i2c-3/name", O_RDONLY) = 4
fstat(4, {st_mode=S_IFREG|0444, st_size=4096, ...}) = 0
read(4, "i915 gmbus panel\n", 4096) = 17
close(4)= 0
open("/sys/class/i2c-adapter/i2c-1/name", O_RDONLY) = 4
fstat(4, {st_mode=S_IFREG|0444, st_size=4096, ...}) = 0
read(4, "i915 gmbus ssc\n", 4096) = 15
close(4)= 0
open("/sys/class/i2c-adapter/i2c-8/name", O_RDONLY) = 4
fstat(4, {st_mode=S_IFREG|0444, st_size=4096, ...}) = 0
read(4, "DPDDC-B\n", 4096) = 8
close(4)= 0
open("/sys/class/i2c-adapter/i2c-6/name", O_RDONLY) = 4
fstat(4, {st_mode=S_IFREG|0444, st_size=4096, ...}) = 0
read(4, "i915 gmbus dpd\n", 4096) = 15
close(4)= 0
open("/sys/class/i2c-adapter/i2c-4/name", O_RDONLY) = 4
fstat(4, {st_mode=S_IFREG|0444, st_size=4096, ...}) = 0
read(4, "i915 gmbus dpc\n",
