kirkwood / openrd: umount problem using mdev (busybox)
Dieter Kiermaier
dk-arm-linux at gmx.de
Fri Nov 6 09:59:47 EST 2009
Hi all,
I've encountered a new problem with regards to busybox mdev while umounting a usb pendrive:
I'm using kernel
sh-3.2# uname -a
Linux DB88FXX81 2.6.32-rc4 #2 PREEMPT Thu Nov 5 13:41:41 CET 2009 armv5tel GNU/Linux
sh-3.2#
Mounting and umounting manually works like a charm without any problems. But if I disconnected a
mounted pendrive and wants mdev to umount it on a remove event the umount call hangs until I get a
message from my kernel (see below).
A strace of the umount call gives:
execve("/bin/umount", ["umount", "-f", "-l", "/dev/sda1"], [/* 14 vars */]) = 0
brk(0) = 0xf5000
uname({sys="Linux", node="DB88FXX81", ...}) = 0
mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x4001d000
access("/etc/ld.so.preload", R_OK) = -1 ENOENT (No such file or directory)
open("/etc/ld.so.cache", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/lib/tls/v5l/fast-mult/half/libm.so.6", O_RDONLY) = -1 ENOENT (No such file or directory)
stat64("/lib/tls/v5l/fast-mult/half", 0xbed722f8) = -1 ENOENT (No such file or directory)
open("/lib/tls/v5l/fast-mult/libm.so.6", O_RDONLY) = -1 ENOENT (No such file or directory)
stat64("/lib/tls/v5l/fast-mult", 0xbed722f8) = -1 ENOENT (No such file or directory)
open("/lib/tls/v5l/half/libm.so.6", O_RDONLY) = -1 ENOENT (No such file or directory)
stat64("/lib/tls/v5l/half", 0xbed722f8) = -1 ENOENT (No such file or directory)
open("/lib/tls/v5l/libm.so.6", O_RDONLY) = -1 ENOENT (No such file or directory)
stat64("/lib/tls/v5l", 0xbed722f8) = -1 ENOENT (No such file or directory)
open("/lib/tls/fast-mult/half/libm.so.6", O_RDONLY) = -1 ENOENT (No such file or directory)
stat64("/lib/tls/fast-mult/half", 0xbed722f8) = -1 ENOENT (No such file or directory)
open("/lib/tls/fast-mult/libm.so.6", O_RDONLY) = -1 ENOENT (No such file or directory)
stat64("/lib/tls/fast-mult", 0xbed722f8) = -1 ENOENT (No such file or directory)
open("/lib/tls/half/libm.so.6", O_RDONLY) = -1 ENOENT (No such file or directory)
stat64("/lib/tls/half", 0xbed722f8) = -1 ENOENT (No such file or directory)
open("/lib/tls/libm.so.6", O_RDONLY) = -1 ENOENT (No such file or directory)
stat64("/lib/tls", 0xbed722f8) = -1 ENOENT (No such file or directory)
open("/lib/v5l/fast-mult/half/libm.so.6", O_RDONLY) = -1 ENOENT (No such file or directory)
stat64("/lib/v5l/fast-mult/half", 0xbed722f8) = -1 ENOENT (No such file or directory)
open("/lib/v5l/fast-mult/libm.so.6", O_RDONLY) = -1 ENOENT (No such file or directory)
stat64("/lib/v5l/fast-mult", 0xbed722f8) = -1 ENOENT (No such file or directory)
open("/lib/v5l/half/libm.so.6", O_RDONLY) = -1 ENOENT (No such file or directory)
stat64("/lib/v5l/half", 0xbed722f8) = -1 ENOENT (No such file or directory)
open("/lib/v5l/libm.so.6", O_RDONLY) = -1 ENOENT (No such file or directory)
stat64("/lib/v5l", 0xbed722f8) = -1 ENOENT (No such file or directory)
open("/lib/fast-mult/half/libm.so.6", O_RDONLY) = -1 ENOENT (No such file or directory)
stat64("/lib/fast-mult/half", 0xbed722f8) = -1 ENOENT (No such file or directory)
open("/lib/fast-mult/libm.so.6", O_RDONLY) = -1 ENOENT (No such file or directory)
stat64("/lib/fast-mult", 0xbed722f8) = -1 ENOENT (No such file or directory)
open("/lib/half/libm.so.6", O_RDONLY) = -1 ENOENT (No such file or directory)
stat64("/lib/half", 0xbed722f8) = -1 ENOENT (No such file or directory)
open("/lib/libm.so.6", O_RDONLY) = 4
read(4, "\177ELF\1\1\1\0\0\0\0\0\0\0\0\0\3\0(\0\1\0\0\0\0342\0\0004\0\0\0"..., 512) = 512
fstat64(4, {st_mode=S_IFREG|0755, st_size=693352, ...}) = 0
mmap2(NULL, 712856, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 4, 0) = 0x40026000
mprotect(0x400cc000, 28672, PROT_NONE) = 0
mmap2(0x400d3000, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 4, 0xa5) = 0x400d3000
close(4) = 0
open("/lib/libgcc_s.so.1", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/usr/lib/tls/v5l/fast-mult/half/libgcc_s.so.1", O_RDONLY) = -1 ENOENT (No such file or directory)
stat64("/usr/lib/tls/v5l/fast-mult/half", 0xbed722e0) = -1 ENOENT (No such file or directory)
open("/usr/lib/tls/v5l/fast-mult/libgcc_s.so.1", O_RDONLY) = -1 ENOENT (No such file or directory)
stat64("/usr/lib/tls/v5l/fast-mult", 0xbed722e0) = -1 ENOENT (No such file or directory)
open("/usr/lib/tls/v5l/half/libgcc_s.so.1", O_RDONLY) = -1 ENOENT (No such file or directory)
stat64("/usr/lib/tls/v5l/half", 0xbed722e0) = -1 ENOENT (No such file or directory)
open("/usr/lib/tls/v5l/libgcc_s.so.1", O_RDONLY) = -1 ENOENT (No such file or directory)
stat64("/usr/lib/tls/v5l", 0xbed722e0) = -1 ENOENT (No such file or directory)
open("/usr/lib/tls/fast-mult/half/libgcc_s.so.1", O_RDONLY) = -1 ENOENT (No such file or directory)
stat64("/usr/lib/tls/fast-mult/half", 0xbed722e0) = -1 ENOENT (No such file or directory)
open("/usr/lib/tls/fast-mult/libgcc_s.so.1", O_RDONLY) = -1 ENOENT (No such file or directory)
stat64("/usr/lib/tls/fast-mult", 0xbed722e0) = -1 ENOENT (No such file or directory)
open("/usr/lib/tls/half/libgcc_s.so.1", O_RDONLY) = -1 ENOENT (No such file or directory)
stat64("/usr/lib/tls/half", 0xbed722e0) = -1 ENOENT (No such file or directory)
open("/usr/lib/tls/libgcc_s.so.1", O_RDONLY) = -1 ENOENT (No such file or directory)
stat64("/usr/lib/tls", 0xbed722e0) = -1 ENOENT (No such file or directory)
open("/usr/lib/v5l/fast-mult/half/libgcc_s.so.1", O_RDONLY) = -1 ENOENT (No such file or directory)
stat64("/usr/lib/v5l/fast-mult/half", 0xbed722e0) = -1 ENOENT (No such file or directory)
open("/usr/lib/v5l/fast-mult/libgcc_s.so.1", O_RDONLY) = -1 ENOENT (No such file or directory)
stat64("/usr/lib/v5l/fast-mult", 0xbed722e0) = -1 ENOENT (No such file or directory)
open("/usr/lib/v5l/half/libgcc_s.so.1", O_RDONLY) = -1 ENOENT (No such file or directory)
stat64("/usr/lib/v5l/half", 0xbed722e0) = -1 ENOENT (No such file or directory)
open("/usr/lib/v5l/libgcc_s.so.1", O_RDONLY) = -1 ENOENT (No such file or directory)
stat64("/usr/lib/v5l", 0xbed722e0) = -1 ENOENT (No such file or directory)
open("/usr/lib/fast-mult/half/libgcc_s.so.1", O_RDONLY) = -1 ENOENT (No such file or directory)
stat64("/usr/lib/fast-mult/half", 0xbed722e0) = -1 ENOENT (No such file or directory)
open("/usr/lib/fast-mult/libgcc_s.so.1", O_RDONLY) = -1 ENOENT (No such file or directory)
stat64("/usr/lib/fast-mult", 0xbed722e0) = -1 ENOENT (No such file or directory)
open("/usr/lib/half/libgcc_s.so.1", O_RDONLY) = -1 ENOENT (No such file or directory)
stat64("/usr/lib/half", 0xbed722e0) = -1 ENOENT (No such file or directory)
open("/usr/lib/libgcc_s.so.1", O_RDONLY) = 4
read(4, "\177ELF\1\1\1\0\0\0\0\0\0\0\0\0\3\0(\0\1\0\0\0\304\"\0\0004\0\0\0"..., 512) = 512
fstat64(4, {st_mode=S_IFREG|0644, st_size=65824, ...}) = 0
mmap2(NULL, 78540, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 4, 0) = 0x400d5000
mprotect(0x400e1000, 28672, PROT_NONE) = 0
mmap2(0x400e8000, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 4, 0xb) = 0x400e8000
close(4) = 0
open("/lib/libc.so.6", O_RDONLY) = 4
read(4, "\177ELF\1\1\1\0\0\0\0\0\0\0\0\0\3\0(\0\1\0\0\0\340J\1\0004\0\0\0"..., 512) = 512
fstat64(4, {st_mode=S_IFREG|0755, st_size=1249460, ...}) = 0
mmap2(NULL, 1237404, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 4, 0) = 0x400e9000
mprotect(0x4020b000, 28672, PROT_NONE) = 0
mmap2(0x40212000, 12288, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 4, 0x121) = 0x40212000
mmap2(0x40215000, 8604, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x40215000
close(4) = 0
mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x4001e000
set_tls(0x4001e720, 0x400256f4, 0x4001edf8, 0x40025058, 0x40) = 0
mprotect(0x40212000, 8192, PROT_READ) = 0
mprotect(0x400d3000, 4096, PROT_READ) = 0
getpid() = 562
getuid32() = 0
brk(0) = 0xf5000
brk(0x117000) = 0x117000
open("/proc/mounts", 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) = 0x4001f000
read(4, "rootfs / rootfs rw 0 0\n/dev/root"..., 1024) = 655
read(4, "", 1024) = 0
close(4) = 0
munmap(0x4001f000, 4096) = 0
lstat64("/dev", {st_mode=S_IFDIR|S_ISVTX|0777, st_size=2880, ...}) = 0
lstat64("/dev/sda1", {st_mode=S_IFBLK|0660, st_rdev=makedev(8, 1), ...}) = 0
umount("/mnt/usbdisk", 0
And after that the process hangs:
sh-3.2# ps
PID USER VSZ STAT COMMAND
1 root 3256 S init
2 root 0 SW [kthreadd]
3 root 0 SW [ksoftirqd/0]
4 root 0 SW [watchdog/0]
5 root 0 SW [events/0]
6 root 0 SW [khelper]
9 root 0 SW [async/mgr]
133 root 0 SW [sync_supers]
135 root 0 SW [bdi-default]
137 root 0 SW [kblockd/0]
143 root 0 SW [ata/0]
144 root 0 SW [ata_aux]
152 root 0 SW [khubd]
155 root 0 SW [kseriod]
158 root 0 SW [kmmcd]
178 root 0 SW [rpciod/0]
186 root 0 SW [khungtaskd]
187 root 0 SW [kswapd0]
236 root 0 SW [aio/0]
244 root 0 SW [nfsiod]
250 root 0 SW [crypto/0]
387 root 0 SW [scsi_eh_0]
390 root 0 SW [scsi_eh_1]
397 root 0 SW [mtdblockd]
411 root 0 SW [orion_spi]
494 root 0 SW [usbhid_resumer]
515 root 2280 S /bin/sh /sbin/mini_httpd_wrapper
516 root 2644 S -/bin/sh
519 root 2176 S /sbin/mini_httpd -D -d /var/www -u root -c **.cgi -i
527 root 0 SW [scsi_eh_2]
550 root 3264 S /sbin/mdev block
554 root 2604 S /bin/sh /sbin/mdev_mount_usbdisk.sh
561 root 1836 S strace umount -f -l /dev/sda1
562 root 3260 D umount -f -l /dev/sda1
564 root 3260 R ps
sh-3.2#
After a while I get this from my kernel every now and then:
sh-3.2# INFO: task umount:562 blocked for more than 120 seconds.
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
umount D c03467c0 0 562 561 0x00000100
[<c03467c0>] (schedule+0x360/0x3f0) from [<c00d18f0>] (bdi_sched_wait+0xc/0x18)
[<c00d18f0>] (bdi_sched_wait+0xc/0x18) from [<c03472e4>] (__wait_on_bit+0x60/0xac)
[<c03472e4>] (__wait_on_bit+0x60/0xac) from [<c03473a4>] (out_of_line_wait_on_bit+0x74/0x80)
[<c03473a4>] (out_of_line_wait_on_bit+0x74/0x80) from [<c00d1984>] (sync_inodes_sb+0x88/0x17c)
[<c00d1984>] (sync_inodes_sb+0x88/0x17c) from [<c00d5c38>] (__sync_filesystem+0x30/0x6c)
[<c00d5c38>] (__sync_filesystem+0x30/0x6c) from [<c00b6248>] (generic_shutdown_super+0x2c/0x130)
[<c00b6248>] (generic_shutdown_super+0x2c/0x130) from [<c00b6368>] (kill_block_super+0x1c/0x38)
[<c00b6368>] (kill_block_super+0x1c/0x38) from [<c00b66c0>] (deactivate_super+0x68/0x8c)
[<c00b66c0>] (deactivate_super+0x68/0x8c) from [<c00cd734>] (sys_umount+0x2c8/0x2fc)
[<c00cd734>] (sys_umount+0x2c8/0x2fc) from [<c0026b1c>] (__sys_trace_return+0x0/0x24)
Any help would be welcome!
Many thanks,
Dieter
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