Messages in this thread | | | Date | Wed, 22 Aug 2007 23:56:44 -0400 | From | Joel Fuster <> | Subject | Re: sysfs_dir_cache growing out of control |
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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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