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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