Hello,

I have FC6 with default latest kernel and I configured encrypted swap (using /etc/crypttab). Now when I need to use losetup to "mount" floppy disk image as a loop device, I should have module loop loaded first.

When I try "modprobe loop" modprobe hangs and starts to spawn its copies, and then I see more and more modprobe processes eating all my CPU time and swap space. The only thing which saves my system from crash is to cancel the modprobe or if I do "killall modprobe".

However I discovered that I can use insmod and it is working fine (also losetup is fine) - so this is kind of a workaround: # /sbin/insmod /lib/modules/2.6.20-1.2952.fc6/kernel/drivers/block/loop.ko #

Once the module loop.ko is in the loaded, modprobe does not have a problem (of course): # /sbin/modprobe loop #

However when I remove the loop.ko (rmmod loop), modprobe has a problem again.

I have the same problem with both below kernels: 2.6.20-1.2952.fc6 2.6.20-1.2944.fc6

Am I doing something wrong here or is it a bug?

My hardware is VIA C7 and below you can find strace and lsmod outputs.

Thank you very much,

Jan

PS: Here are mentioned outputs::

#strace /sbin/modprobe loop execve("/sbin/modprobe", ["/sbin/modprobe", "loop"], [/* 24 vars */]) = 0 brk(0) = 0x9abe000 mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0xb7fa0000 access("/etc/ld.so.preload", R_OK) = -1 ENOENT (No such file or directory) open("/etc/ld.so.cache", O_RDONLY) = 3 fstat64(3, {st_mode=S_IFREG|0644, st_size=66971, ...}) = 0 mmap2(NULL, 66971, PROT_READ, MAP_PRIVATE, 3, 0) = 0xb7f8f000 close(3) = 0 open("/lib/libc.so.6", O_RDONLY) = 3 read(3, "\177ELF\1\1\1\0\0\0\0\0\0\0\0\0\3\0\3\0\1\0\0\0p\20\200"..., 512) = 512 fstat64(3, {st_mode=S_IFREG|0755, st_size=1576920, ...}) = 0 mmap2(0x487eb000, 1295780, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x487eb000 mmap2(0x48922000, 12288, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x137) = 0x48922000 mmap2(0x48925000, 9636, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x48925000 close(3) = 0 mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0xb7f8e000 set_thread_area({entry_number:-1 -> 6, base_addr:0xb7f8e6c0, limit:1048575, seg_32bit:1, contents:0, read_exec_only:0, limit_in_pages:1, seg_not_present:0, useable:1}) = 0 mprotect(0x48922000, 8192, PROT_READ) = 0 mprotect(0x468e6000, 4096, PROT_READ) = 0 munmap(0xb7f8f000, 66971) = 0 uname({sys="Linux", node="thsw", ...}) = 0 fstat64(2, {st_mode=S_IFCHR|0620, st_rdev=makedev(136, 0), ...}) = 0 brk(0) = 0x9abe000 brk(0x9adf000) = 0x9adf000 open("/etc/modprobe.d", O_RDONLY|O_NONBLOCK|O_LARGEFILE|O_DIRECTORY) = 3 fstat64(3, {st_mode=S_IFDIR|0755, st_size=4096, ...}) = 0 fcntl64(3, F_SETFD, FD_CLOEXEC) = 0 getdents(3, /* 5 entries */, 4096) = 116 open("/etc/modprobe.d/blacklist", O_RDONLY|O_NONBLOCK|O_LARGEFILE|O_DIRECTORY) = -1 ENOTDIR (Not a directory) open("/etc/modprobe.d/blacklist", O_RDONLY) = 4 fstat64(4, {st_mode=S_IFREG|0644, st_size=809, ...}) = 0 mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0xb7f9f000 read(4, "#\n# Listing a module here preven"..., 4096) = 809 read(4, "", 4096) = 0 close(4) = 0 munmap(0xb7f9f000, 4096) = 0 open("/etc/modprobe.d/modprobe.conf.dist", O_RDONLY|O_NONBLOCK|O_LARGEFILE|O_DIRECTORY) = -1 ENOTDIR (Not a directory) open("/etc/modprobe.d/modprobe.conf.dist", O_RDONLY) = 4 fstat64(4, {st_mode=S_IFREG|0644, st_size=5717, ...}) = 0 mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0xb7f9f000 read(4, "# default modutils aliases\nalias"..., 4096) = 4096 read(4, "l net-pf-3 /bin/true\ninstall net"..., 4096) = 1621 read(4, "", 4096) = 0 close(4) = 0 munmap(0xb7f9f000, 4096) = 0 open("/etc/modprobe.d/blacklist-compat", O_RDONLY|O_NONBLOCK|O_LARGEFILE|O_DIRECTORY) = -1 ENOTDIR (Not a directory) open("/etc/modprobe.d/blacklist-compat", O_RDONLY) = 4 fstat64(4, {st_mode=S_IFREG|0644, st_size=833, ...}) = 0 mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0xb7f9f000 read(4, "#\n# Listing a module here preven"..., 4096) = 833 read(4, "", 4096) = 0 close(4) = 0 munmap(0xb7f9f000, 4096) = 0 getdents(3, /* 0 entries */, 4096) = 0 close(3) = 0 open("/etc/modprobe.d", O_RDONLY) = 3 fstat64(3, {st_mode=S_IFDIR|0755, st_size=4096, ...}) = 0 mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0xb7f9f000 read(3, 0xb7f9f000, 4096) = -1 EISDIR (Is a directory) close(3) = 0 munmap(0xb7f9f000, 4096) = 0 open("/etc/modprobe.conf", O_RDONLY|O_NONBLOCK|O_LARGEFILE|O_DIRECTORY) = -1 ENOTDIR (Not a directory) open("/etc/modprobe.conf", O_RDONLY) = 3 fstat64(3, {st_mode=S_IFREG|0644, st_size=432, ...}) = 0 mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0xb7f9f000 read(3, "#Tofu:\ninstall loop /sbin/modpro"..., 4096) = 432 read(3, "", 4096) = 0 close(3) = 0 munmap(0xb7f9f000, 4096) = 0 open("/lib/modules/2.6.20-1.2952.fc6/modules.dep", O_RDONLY) = 3 fstat64(3, {st_mode=S_IFREG|0644, st_size=276791, ...}) = 0 mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0xb7f9f000 read(3, "/lib/modules/2.6.20-1.2952.fc6/k"..., 4096) = 4096 read(3, "nls_cp857.ko:\n/lib/modules/2.6.2"..., 4096) = 4096 read(3, ".20-1.2952.fc6/kernel/net/802/p8"..., 4096) = 4096 read(3, "ernel/drivers/net/slhc.ko\n/lib/m"..., 4096) = 4096 read(3, "netfilter/x_tables.ko\n/lib/modul"..., 4096) = 4096 read(3, "ge/netfilter/ebtables.ko\n/lib/mo"..., 4096) = 4096 read(3, ".6.20-1.2952.fc6/kernel/net/netf"..., 4096) = 4096 read(3, "/lib/modules/2.6.20-1.2952.fc6/k"..., 4096) = 4096 read(3, "b/modules/2.6.20-1.2952.fc6/kern"..., 4096) = 4096 read(3, "-1.2952.fc6/kernel/net/netfilter"..., 4096) = 4096 read(3, "ules/2.6.20-1.2952.fc6/kernel/ne"..., 4096) = 4096 read(3, "/lib/modules/2.6.20-1.2952.fc6/k"..., 4096) = 4096 read(3, "vers/net/tokenring/olympic.ko:\n/"..., 4096) = 4096 read(3, "t/ieee80211/ieee80211_crypt.ko\n/"..., 4096) = 4096 read(3, "rda/irda.ko /lib/modules/2.6.20-"..., 4096) = 4096 read(3, "ib/modules/2.6.20-1.2952.fc6/ker"..., 4096) = 4096 read(3, "modules/2.6.20-1.2952.fc6/kernel"..., 4096) = 4096 read(3, ".fc6/kernel/drivers/i2c/i2c-core"..., 4096) = 4096 read(3, "/modules/2.6.20-1.2952.fc6/kerne"..., 4096) = 4096 read(3, "drivers/mtd/chips/chipreg.ko:\n/l"..., 4096) = 4096 read(3, "20-1.2952.fc6/kernel/drivers/mtd"..., 4096) = 4096 read(3, "mtd_blkdevs.ko /lib/modules/2.6."..., 4096) = 4096 read(3, "csi_transport_sas.ko /lib/module"..., 4096) = 4096 read(3, "2.6.20-1.2952.fc6/kernel/drivers"..., 4096) = 4096 read(3, "2952.fc6/kernel/drivers/infiniba"..., 4096) = 4096 read(3, "/drivers/media/video/compat_ioct"..., 4096) = 4096 read(3, "/2.6.20-1.2952.fc6/kernel/driver"..., 4096) = 4096 read(3, "/media/video/video-buf.ko /lib/m"..., 4096) = 4096 read(3, "-common.ko /lib/modules/2.6.20-1"..., 4096) = 4096 read(3, "media/dvb/frontends/isl6421.ko: "..., 4096) = 4096 read(3, "modules/2.6.20-1.2952.fc6/kernel"..., 4096) = 4096 read(3, "es/2.6.20-1.2952.fc6/kernel/driv"..., 4096) = 4096 read(3, ".ko /lib/modules/2.6.20-1.2952.f"..., 4096) = 4096 read(3, "es/2.6.20-1.2952.fc6/kernel/driv"..., 4096) = 4096 read(3, "lib/modules/2.6.20-1.2952.fc6/ke"..., 4096) = 4096 read(3, "common/ir-common.ko /lib/modules"..., 4096) = 4096 read(3, "ernel/drivers/media/video/v4l2-c"..., 4096) = 4096 read(3, "ko /lib/modules/2.6.20-1.2952.fc"..., 4096) = 4096 read(3, "/v4l1-compat.ko\n/lib/modules/2.6"..., 4096) = 4096 close(3) = 0 munmap(0xb7f9f000, 4096) = 0 open("/lib/modules/2.6.20-1.2952.fc6/kernel/drivers/block/loop.ko", O_RDWR) = 3 fcntl64(3, F_SETLKW, {type=F_WRLCK, whence=SEEK_SET, start=0, len=1}) = 0 open("/proc/modules", O_RDONLY) = 4 fstat64(4, {st_mode=S_IFREG|0444, st_size=0, ...}) = 0 mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0xb7f9f000 read(4, "autofs4 24261 2 - Live 0xf8dc600"..., 1024) = 1024 read(4, "onntrack, Live 0xf8cbf000\niptabl"..., 1024) = 1024 read(4, "7 1 asus_acpi, Live 0xf8b91000\na"..., 1024) = 1024 read(4, "ixer_oss,snd_pcm,snd_timer,snd_m"..., 1024) = 1024 read(4, "t3, Live 0xf8880000\nehci_hcd 341"..., 1024) = 125 read(4, "", 1024) = 0 close(4) = 0 munmap(0xb7f9f000, 4096) = 0 close(3) = 0 rt_sigaction(SIGINT, {SIG_IGN}, {SIG_DFL}, 8) = 0 rt_sigaction(SIGQUIT, {SIG_IGN}, {SIG_DFL}, 8) = 0 rt_sigprocmask(SIG_BLOCK, [CHLD], [], 8) = 0 clone(child_stack=0, flags=CLONE_PARENT_SETTID|SIGCHLD, parent_tidptr=0xbfc382a4) = 20034 waitpid(20034, !!!!! ^^^ Here it hangs and starts to fork itself

#--------------------------------------------------------------------------------------------------- # /sbin/lsmod Module Size Used by autofs4 24261 2 f71805f 22085 0 hwmon 7493 1 f71805f eeprom 11217 0 hidp 23617 2 l2cap 30657 5 hidp bluetooth 57893 2 hidp,l2cap sunrpc 153597 1 xt_conntrack 6849 3 nf_nat_ftp 7489 0 nf_conntrack_ftp 13761 1 nf_nat_ftp xt_pkttype 5953 6 xt_limit 6721 17 ipt_LOG 10305 20 iptable_mangle 6977 0 iptable_nat 11461 1 nf_nat 21997 2 nf_nat_ftp,iptable_nat nf_conntrack_netbios_ns 7104 0 ipt_REJECT 8641 1 nf_conntrack_ipv4 21709 18 iptable_nat xt_state 6593 13 nf_conntrack 62409 8 xt_conntrack,nf_nat_ftp,nf_conntrack_ftp,iptable_nat,nf_nat,nf_conntrack_netbios_ns,nf_conntrack_ipv4,xt_state nfnetlink 10841 3 nf_nat,nf_conntrack_ipv4,nf_conntrack iptable_filter 7105 1 ip_tables 16389 3 iptable_mangle,iptable_nat,iptable_filter ip6t_REJECT 9537 1 xt_tcpudp 7233 22 ip6table_filter 6849 1 ip6_tables 17541 1 ip6table_filter x_tables 18757 11 xt_conntrack,xt_pkttype,xt_limit,ipt_LOG,iptable_nat,ipt_REJECT,xt_state,ip_tables,ip6t_REJECT,xt_tcpudp,ip6_tables ipv6 275969 26 ip6t_REJECT acpi_cpufreq 14281 0 sha256 15297 0 aes 31617 4 cbc 8513 2 blkcipher 9665 1 cbc dm_crypt 16969 1 dm_multipath 21833 0 raid0 12225 3 video 19909 0 sbs 19073 0 i2c_ec 9025 1 sbs dock 13977 0 button 11857 0 battery 13893 0 asus_acpi 20445 0 backlight 10177 1 asus_acpi ac 9157 0 lp 16265 0 snd_via82xx 31577 0 gameport 19401 1 snd_via82xx snd_ac97_codec 93413 1 snd_via82xx ac97_bus 6465 1 snd_ac97_codec snd_seq_dummy 7877 0 snd_seq_oss 33601 0 snd_seq_midi_event 11201 1 snd_seq_oss snd_seq 51249 5 snd_seq_dummy,snd_seq_oss,snd_seq_midi_event snd_pcm_oss 43617 0 snd_mixer_oss 19393 1 snd_pcm_oss snd_pcm 75205 3 snd_via82xx,snd_ac97_codec,snd_pcm_oss snd_timer 25157 2 snd_seq,snd_pcm snd_page_alloc 13769 2 snd_via82xx,snd_pcm snd_mpu401_uart 12609 1 snd_via82xx snd_rawmidi 26817 1 snd_mpu401_uart snd_seq_device 11853 4 snd_seq_dummy,snd_seq_oss,snd_seq,snd_rawmidi snd 53829 11 snd_via82xx,snd_ac97_codec,snd_seq_oss,snd_seq,snd_pcm_oss,snd_mixer_oss,snd_pcm,snd_timer,snd_mpu401_uart,snd_rawmidi,snd_seq_device i2c_viapro 12629 0 r8169 33481 0 parport_pc 30053 1 soundcore 11681 1 snd ohci1394 37489 0 via_rhine 28489 0 mii 9409 1 via_rhine ieee1394 294681 1 ohci1394 i2c_core 24897 3 eeprom,i2c_ec,i2c_viapro parport 38537 2 lp,parport_pc pcspkr 7233 0 dm_snapshot 20849 0 dm_zero 6209 0 dm_mirror 25301 0 dm_mod 58253 24 dm_crypt,dm_multipath,dm_snapshot,dm_zero,dm_mirror sata_via 14533 0 libata 104661 1 sata_via sd_mod 24129 0 scsi_mod 138093 2 libata,sd_mod raid456 123473 0 xor 18121 1 raid456 raid1 26433 9 ext3 125641 7 jbd 60777 1 ext3 ehci_hcd 34125 0 ohci_hcd 23493 0 uhci_hcd 26705 0