Re: sysfs_dir_cache growing out of control

From: Joel Fuster
Date: Wed Aug 22 2007 - 23:56:58 EST

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Joel Fuster wrote:

Hi,

I am running 2.6.22.3. For reasons that escape me, over time (days) the sysfs_dir_cache, dentry, and inode_cache SLUB entries grow until they consume all the memory on my system, requiring a reboot.

Although I did not record objective evidence of this at the time, I suspect I had the same problem with 2.6.18 and 2.6.20...I certainly had the same symptoms.

An update to this...it seems to be related to "scanbuttond" which is an app that uses libusb to poll a scanner for button presses on the scanner itself. The number of objects in sysfs_dir_cache stops growing when I kill the scanbuttond process.

An strace of one poll loop for scanbuttond follows:

nanosleep({0, 333000000}, NULL) = 0
open("/dev/bus/usb", O_RDONLY|O_NONBLOCK|O_DIRECTORY) = 1
fstat(1, {st_mode=S_IFDIR|0755, st_size=80, ...}) = 0
fcntl(1, F_SETFD, FD_CLOEXEC) = 0
getdents(1, /* 4 entries */, 4096) = 96
getdents(1, /* 0 entries */, 4096) = 0
close(1) = 0
open("/dev/bus/usb/002", O_RDONLY|O_NONBLOCK|O_DIRECTORY) = 1
fstat(1, {st_mode=S_IFDIR|0755, st_size=60, ...}) = 0
fcntl(1, F_SETFD, FD_CLOEXEC) = 0
getdents(1, /* 3 entries */, 4096) = 72
open("/dev/bus/usb/002/001", O_RDWR) = -1 EACCES (Permission denied)
open("/dev/bus/usb/002/001", O_RDONLY) = 2
ioctl(2, USBDEVFS_CONNECTINFO, 0x7fffb3a08420) = -1 EPERM (Operation not permitted)
read(2, "\22\1\0\2\t\0\1@\0\0\0\0\6\2\3\2\1\1", 18) = 18
read(2, "\t\2\31\0\1\1\0\340", 8) = 8
read(2, "\0\t\4\0\0\1\t\0\0\0\7\5\201\3\4\0\f", 17) = 17
close(2) = 0
getdents(1, /* 0 entries */, 4096) = 0
close(1) = 0
open("/dev/bus/usb/002/001", O_RDWR) = -1 EACCES (Permission denied)
open("/dev/bus/usb/002/001", O_RDONLY) = 1
ioctl(1, USBDEVFS_IOCTL, 0x7fffb3a08420) = -1 EPERM (Operation not permitted)
close(1) = 0
open("/dev/bus/usb/001", O_RDONLY|O_NONBLOCK|O_DIRECTORY) = 1
fstat(1, {st_mode=S_IFDIR|0755, st_size=100, ...}) = 0
fcntl(1, F_SETFD, FD_CLOEXEC) = 0
getdents(1, /* 4 entries */, 4096) = 96
getdents(1, /* 0 entries */, 4096) = 0
close(1) = 0
open("/dev/bus/usb/002", O_RDONLY|O_NONBLOCK|O_DIRECTORY) = 1
fstat(1, {st_mode=S_IFDIR|0755, st_size=60, ...}) = 0
fcntl(1, F_SETFD, FD_CLOEXEC) = 0
getdents(1, /* 3 entries */, 4096) = 72
open("/dev/bus/usb/002/001", O_RDWR) = -1 EACCES (Permission denied)
open("/dev/bus/usb/002/001", O_RDONLY) = 2
ioctl(2, USBDEVFS_CONNECTINFO, 0x7fffb3a08420) = -1 EPERM (Operation not permitted)
read(2, "\22\1\0\2\t\0\1@\0\0\0\0\6\2\3\2\1\1", 18) = 18
read(2, "\t\2\31\0\1\1\0\340", 8) = 8
read(2, "\0\t\4\0\0\1\t\0\0\0\7\5\201\3\4\0\f", 17) = 17
close(2) = 0
getdents(1, /* 0 entries */, 4096) = 0
close(1) = 0
open("/dev/bus/usb/002/001", O_RDWR) = -1 EACCES (Permission denied)
open("/dev/bus/usb/002/001", O_RDONLY) = 1
ioctl(1, USBDEVFS_IOCTL, 0x7fffb3a08420) = -1 EPERM (Operation not permitted)
close(1) = 0
open("/dev/bus/usb/001", O_RDONLY|O_NONBLOCK|O_DIRECTORY) = 1
fstat(1, {st_mode=S_IFDIR|0755, st_size=100, ...}) = 0
fcntl(1, F_SETFD, FD_CLOEXEC) = 0
getdents(1, /* 5 entries */, 4096) = 120
open("/dev/bus/usb/001/004", O_RDWR) = 2
ioctl(2, USBDEVFS_CONNECTINFO, 0x7fffb3a08420) = 0
read(2, "\22\1\20\1\0\0\0@\330\5\3@\0\1\0\0\0\1", 18) = 18
read(2, "\t\2 \0\1\1\0\240", 8) = 8
read(2, "\372\t\4\0\0\2\377\377\377\0\7\5\201\2@\0\0\7\5\2\2@\0"..., 24) = 24
close(2) = 0
open("/dev/bus/usb/001/003", O_RDWR) = -1 EACCES (Permission denied)
open("/dev/bus/usb/001/003", O_RDONLY) = 2
ioctl(2, USBDEVFS_CONNECTINFO, 0x7fffb3a08420) = -1 EPERM (Operation not permitted)
read(2, "\22\1\20\1\0\0\0@{\6\3#\0\3\1\2\0\1", 18) = 18
read(2, "\t\2\'\0\1\1\0\200", 8) = 8
read(2, "2\t\4\0\0\3\377\0\0\0\7\5\201\3\n\0\1\7\5\2\2@\0\0\7\5"..., 31) = 31
close(2) = 0
open("/dev/bus/usb/001/001", O_RDWR) = -1 EACCES (Permission denied)
open("/dev/bus/usb/001/001", O_RDONLY) = 2
ioctl(2, USBDEVFS_CONNECTINFO, 0x7fffb3a08420) = -1 EPERM (Operation not permitted)
read(2, "\22\1\20\1\t\0\0@\0\0\0\0\6\2\3\2\1\1", 18) = 18
read(2, "\t\2\31\0\1\1\0\340", 8) = 8
read(2, "\0\t\4\0\0\1\t\0\0\0\7\5\201\3\2\0\377", 17) = 17
close(2) = 0
getdents(1, /* 0 entries */, 4096) = 0
close(1) = 0
open("/dev/bus/usb/001/004", O_RDWR) = 1
ioctl(1, USBDEVFS_IOCTL, 0x7fffb3a08420) = -1 ENOTTY (Inappropriate ioctl for device)
close(1) = 0
open("/dev/bus/usb/001/003", O_RDWR) = -1 EACCES (Permission denied)
open("/dev/bus/usb/001/003", O_RDONLY) = 1
ioctl(1, USBDEVFS_IOCTL, 0x7fffb3a08420) = -1 EPERM (Operation not permitted)
close(1) = 0
open("/dev/bus/usb/001/001", O_RDWR) = -1 EACCES (Permission denied)
open("/dev/bus/usb/001/001", O_RDONLY) = 1
ioctl(1, USBDEVFS_IOCTL, 0x7fffb3a08420) = -1 EPERM (Operation not permitted)
close(1) = 0
open("/dev/bus/usb", O_RDONLY|O_NONBLOCK|O_DIRECTORY) = 1
fstat(1, {st_mode=S_IFDIR|0755, st_size=80, ...}) = 0
fcntl(1, F_SETFD, FD_CLOEXEC) = 0
getdents(1, /* 4 entries */, 4096) = 96
getdents(1, /* 0 entries */, 4096) = 0
close(1) = 0
open("/dev/bus/usb/002", O_RDONLY|O_NONBLOCK|O_DIRECTORY) = 1
fstat(1, {st_mode=S_IFDIR|0755, st_size=60, ...}) = 0
fcntl(1, F_SETFD, FD_CLOEXEC) = 0
getdents(1, /* 3 entries */, 4096) = 72
open("/dev/bus/usb/002/001", O_RDWR) = -1 EACCES (Permission denied)
open("/dev/bus/usb/002/001", O_RDONLY) = 2
ioctl(2, USBDEVFS_CONNECTINFO, 0x7fffb3a08420) = -1 EPERM (Operation not permitted)
read(2, "\22\1\0\2\t\0\1@\0\0\0\0\6\2\3\2\1\1", 18) = 18
read(2, "\t\2\31\0\1\1\0\340", 8) = 8
read(2, "\0\t\4\0\0\1\t\0\0\0\7\5\201\3\4\0\f", 17) = 17
close(2) = 0
getdents(1, /* 0 entries */, 4096) = 0
close(1) = 0
open("/dev/bus/usb/002/001", O_RDWR) = -1 EACCES (Permission denied)
open("/dev/bus/usb/002/001", O_RDONLY) = 1
ioctl(1, USBDEVFS_IOCTL, 0x7fffb3a08420) = -1 EPERM (Operation not permitted)
close(1) = 0
open("/dev/bus/usb/001", O_RDONLY|O_NONBLOCK|O_DIRECTORY) = 1
fstat(1, {st_mode=S_IFDIR|0755, st_size=100, ...}) = 0
fcntl(1, F_SETFD, FD_CLOEXEC) = 0
getdents(1, /* 5 entries */, 4096) = 120
open("/dev/bus/usb/001/004", O_RDWR) = 2
ioctl(2, USBDEVFS_CONNECTINFO, 0x7fffb3a08420) = 0
read(2, "\22\1\20\1\0\0\0@\330\5\3@\0\1\0\0\0\1", 18) = 18
read(2, "\t\2 \0\1\1\0\240", 8) = 8
read(2, "\372\t\4\0\0\2\377\377\377\0\7\5\201\2@\0\0\7\5\2\2@\0"..., 24) = 24
close(2) = 0
open("/dev/bus/usb/001/003", O_RDWR) = -1 EACCES (Permission denied)
open("/dev/bus/usb/001/003", O_RDONLY) = 2
ioctl(2, USBDEVFS_CONNECTINFO, 0x7fffb3a08420) = -1 EPERM (Operation not permitted)
read(2, "\22\1\20\1\0\0\0@{\6\3#\0\3\1\2\0\1", 18) = 18
read(2, "\t\2\'\0\1\1\0\200", 8) = 8
read(2, "2\t\4\0\0\3\377\0\0\0\7\5\201\3\n\0\1\7\5\2\2@\0\0\7\5"..., 31) = 31
close(2) = 0
open("/dev/bus/usb/001/001", O_RDWR) = -1 EACCES (Permission denied)
open("/dev/bus/usb/001/001", O_RDONLY) = 2
ioctl(2, USBDEVFS_CONNECTINFO, 0x7fffb3a08420) = -1 EPERM (Operation not permitted)
read(2, "\22\1\20\1\t\0\0@\0\0\0\0\6\2\3\2\1\1", 18) = 18
read(2, "\t\2\31\0\1\1\0\340", 8) = 8
read(2, "\0\t\4\0\0\1\t\0\0\0\7\5\201\3\2\0\377", 17) = 17
close(2) = 0
getdents(1, /* 0 entries */, 4096) = 0
close(1) = 0
open("/dev/bus/usb/001/004", O_RDWR) = 1
ioctl(1, USBDEVFS_IOCTL, 0x7fffb3a08420) = -1 ENOTTY (Inappropriate ioctl for device)
close(1) = 0
open("/dev/bus/usb/001/003", O_RDWR) = -1 EACCES (Permission denied)
open("/dev/bus/usb/001/003", O_RDONLY) = 1
ioctl(1, USBDEVFS_IOCTL, 0x7fffb3a08420) = -1 EPERM (Operation not permitted)
close(1) = 0
open("/dev/bus/usb/001/001", O_RDWR) = -1 EACCES (Permission denied)
open("/dev/bus/usb/001/001", O_RDONLY) = 1
ioctl(1, USBDEVFS_IOCTL, 0x7fffb3a08420) = -1 EPERM (Operation not permitted)
close(1) = 0
open("/dev/bus/usb/001/004", O_RDWR) = 1
ioctl(1, USBDEVFS_CLAIMINTERFACE, 0x7fffb3a0848c) = 0
ioctl(1, USBDEVFS_CONTROL, 0x7fffb3a08420) = 64
ioctl(1, USBDEVFS_CONTROL, 0x7fffb3a08420) = 8
ioctl(1, USBDEVFS_RELEASEINTERFACE, 0x7fffb3a08494) = 0
close(1) = 0
nanosleep({0, 333000000}, <unfinished ...>

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Next message: Adrian Bunk: "Re: Ideas on column length in kernel "problem"?"
Previous message: Vivek Goyal: "Re: [patch] add kdump_after_notifier"
In reply to: Joel Fuster: "sysfs_dir_cache growing out of control"
Next in thread: Greg KH: "Re: sysfs_dir_cache growing out of control"
Messages sorted by: [ date ] [ thread ] [ subject ] [ author ]