I believe that I'm also running into this bug except in my case
mksquashfs (from squashfs-tools 1:4.0-8) is being invoked by live-helper
(now known as live-build). Occasionally, mksquashfs will hang at
seemingly 100%. I've captured the following debug information:
`-lh_build,16803 /usr/bin/lh_build
`-lh_binary,7979 /usr/bin/lh_binary
`-lh_binary_rootf,9495 /usr/bin/lh_binary_rootfs
`-mksquashfs,9596 chroot filesystem.squashfs
|-{mksquashfs},9598
|-{mksquashfs},9599
|-{mksquashfs},9600
|-{mksquashfs},9601
|-{mksquashfs},9602
|-{mksquashfs},9603
|-{mksquashfs},9604
|-{mksquashfs},9605
|-{mksquashfs},9606
`-{mksquashfs},9607
strace of mksquashfs,9596:
sched_yield() = 0
sched_yield() = 0
sched_yield() = 0
sched_yield() = 0
....
strace of {mksquashfs},9598;
futex(0x92c6998, FUTEX_WAIT_PRIVATE, 5745, NULL
strace of {mksquashfs},9599:
strace of {mksquashfs},9600:
futex(0x92c6100, FUTEX_WAIT_PRIVATE, 73393, NULL) = -1 EAGAIN (Resource
temporarily unavailable)
futex(0x92c6100, FUTEX_WAIT_PRIVATE, 73396, NULL
strace of {mksquashfs},9601:
futex(0x92cb368, FUTEX_WAIT_PRIVATE, 852, NULL
strace of {mksquashfs},9602:
futex(0x92c6100, FUTEX_WAIT_PRIVATE, 73396, NULL
strace of {mksquashfs},9603:
futex(0x92cb368, FUTEX_WAIT_PRIVATE, 851, NULL) = -1 EAGAIN (Resource
temporarily unavailable)
futex(0x92cb368, FUTEX_WAIT_PRIVATE, 852, NULL
strace of {mksquashfs},9604:
futex(0x92c6100, FUTEX_WAIT_PRIVATE, 73394, NULL) = -1 EAGAIN (Resource
temporarily unavailable)
futex(0x92c6100, FUTEX_WAIT_PRIVATE, 73396, NULL
strace of {mksquashfs},9605:
futex(0x92cb368, FUTEX_WAIT_PRIVATE, 849, NULL) = -1 EAGAIN (Resource
temporarily unavailable)
futex(0x92cb368, FUTEX_WAIT_PRIVATE, 852, NULL
strace of {mksquashfs},9606:
futex(0x92c6100, FUTEX_WAIT_PRIVATE, 73395, NULL) = -1 EAGAIN (Resource
temporarily unavailable)
futex(0x92c6100, FUTEX_WAIT_PRIVATE, 73396, NULL
strace of {mksquashfs},9607:
futex(0x92cb368, FUTEX_WAIT_PRIVATE, 850, NULL) = -1 EAGAIN (Resource
temporarily unavailable)
futex(0x92cb368, FUTEX_WAIT_PRIVATE, 852, NULL
strace of mksquashfs,9596 with -f option (to follow children):
...
[pid 9596] sched_yield() = 0
[pid 9596] sched_yield() = 0
[pid 9596] --- SIGALRM (Alarm clock) @ 0 (0) ---
[pid 9596] sigreturn() = ? (mask now [])
[pid 9596] sched_yield() = 0
[pid 9596] sched_yield() = 0
...
pid 9596] sched_yield() = 0
[pid 9599] <... futex resumed> ) = -1 ETIMEDOUT (Connection timed out)
[pid 9599] gettimeofday({1302110049, 888547}, NULL) = 0
[pid 9599] futex(0x80e17a0, FUTEX_WAKE_PRIVATE, 1) = 0
[pid 9599] clock_gettime(CLOCK_REALTIME, {1302110049, 888637707}) = 0
[pid 9599] futex(0x8363de4, FUTEX_WAIT_PRIVATE, 4655307, {0, 249909293}
<unfinished ...>
[pid 9598] <... futex resumed> ) = ? ERESTARTSYS (To be restarted)
[pid 9596] --- SIGALRM (Alarm clock) @ 0 (0) ---
[pid 9598] futex(0x92c6998, FUTEX_WAIT_PRIVATE, 5745, NULL <unfinished ...>
[pid 9596] sigreturn() = ? (mask now [])
[pid 9596] sched_yield() = 0
[pid 9596] sched_yield() = 0
...
(gdb) thread apply all bt full:
Thread 11 (Thread 0xf6ca4b70 (LWP 9598)):
#0 0xf7723430 in __kernel_vsyscall ()
No symbol table info available.
#1 0xf76f94dc in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/libpthread.so.0
No symbol table info available.
#2 0x08050fd4 in queue_get (queue=0x92c6970) at mksquashfs.c:457
data = <value optimized out>
#3 0x080514d1 in writer (arg=0x0) at mksquashfs.c:2314
file_buffer = 0xe7ef070
off = 1006143431
write_error = 0
oldstate = 0
#4 0xf76f4cc9 in start_thread () from /lib/libpthread.so.0
No symbol table info available.
#5 0xf763a6ae in clone () from /lib/libc.so.6
No symbol table info available.
Thread 10 (Thread 0xf64a3b70 (LWP 9599)):
#0 0xf7723430 in __kernel_vsyscall ()
No symbol table info available.
#1 0xf76f9884 in pthread_cond_timedwait@@GLIBC_2.3.2 () from
/lib/libpthread.so.0
No symbol table info available.
#2 0x0804b1f4 in progress_thrd (arg=0x0) at mksquashfs.c:2521
timeval = {tv_sec = 1302110661, tv_usec = 973737}
timespec = {tv_sec = 1302110662, tv_nsec = 223737000}
itimerval = {it_interval = {tv_sec = 0, tv_usec = 250000}, it_value =
{tv_sec = 0, tv_usec = 250000}}
winsize = {ws_row = 0, ws_col = 0, ws_xpixel = 0, ws_ypixel = 0}
#3 0xf76f4cc9 in start_thread () from /lib/libpthread.so.0
No symbol table info available.
#4 0xf763a6ae in clone () from /lib/libc.so.6
No symbol table info available.
Thread 9 (Thread 0xf5ca2b70 (LWP 9600)):
#0 0xf7723430 in __kernel_vsyscall ()
No symbol table info available.
#1 0xf76f94dc in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/libpthread.so.0
No symbol table info available.
#2 0x08050fd4 in queue_get (queue=0x92c60d8) at mksquashfs.c:457
data = <value optimized out>
#3 0x08051345 in deflator (arg=0x0) at mksquashfs.c:2375
write_buffer = 0xd98c8e8
stream = 0xb413a30
oldstate = 0
#4 0xf76f4cc9 in start_thread () from /lib/libpthread.so.0
No symbol table info available.
#5 0xf763a6ae in clone () from /lib/libc.so.6
No symbol table info available.
Thread 8 (Thread 0xf54a1b70 (LWP 9601)):
#0 0xf7723430 in __kernel_vsyscall ()
No symbol table info available.
#1 0xf76f94dc in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/libpthread.so.0
No symbol table info available.
#2 0x08050fd4 in queue_get (queue=0x92cb340) at mksquashfs.c:457
data = <value optimized out>
#3 0x08051241 in frag_deflator (arg=0x0) at mksquashfs.c:2413
compressed_size = 15364
file_buffer = 0x116b6fe0
write_buffer = 0xe7ef070
stream = 0xf6b18b8
oldstate = 0
#4 0xf76f4cc9 in start_thread () from /lib/libpthread.so.0
No symbol table info available.
#5 0xf763a6ae in clone () from /lib/libc.so.6
No symbol table info available.
Thread 7 (Thread 0xf4ca0b70 (LWP 9602)):
#0 0xf7723430 in __kernel_vsyscall ()
No symbol table info available.
#1 0xf76f94dc in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/libpthread.so.0
No symbol table info available.
#2 0x08050fd4 in queue_get (queue=0x92c60d8) at mksquashfs.c:457
data = <value optimized out>
#3 0x08051345 in deflator (arg=0x0) at mksquashfs.c:2375
write_buffer = 0xead400c8
stream = 0xb414320
oldstate = 0
#4 0xf76f4cc9 in start_thread () from /lib/libpthread.so.0
No symbol table info available.
#5 0xf763a6ae in clone () from /lib/libc.so.6
No symbol table info available.
Thread 6 (Thread 0xf449fb70 (LWP 9603)):
#0 0xf7723430 in __kernel_vsyscall ()
No symbol table info available.
#1 0xf76f94dc in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/libpthread.so.0
No symbol table info available.
#2 0x08050fd4 in queue_get (queue=0x92cb340) at mksquashfs.c:457
data = <value optimized out>
#3 0x08051241 in frag_deflator (arg=0x0) at mksquashfs.c:2413
compressed_size = 13340
file_buffer = 0xb8c6ed8
write_buffer = 0xf15c0228
stream = 0x92d33c8
oldstate = 0
#4 0xf76f4cc9 in start_thread () from /lib/libpthread.so.0
No symbol table info available.
#5 0xf763a6ae in clone () from /lib/libc.so.6
No symbol table info available.
Thread 5 (Thread 0xf3c9eb70 (LWP 9604)):
#0 0xf7723430 in __kernel_vsyscall ()
No symbol table info available.
#1 0xf76f94dc in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/libpthread.so.0
No symbol table info available.
#2 0x08050fd4 in queue_get (queue=0x92c60d8) at mksquashfs.c:457
data = <value optimized out>
#3 0x08051345 in deflator (arg=0x0) at mksquashfs.c:2375
write_buffer = 0xda4caf8
stream = 0xb414360
oldstate = 0
#4 0xf76f4cc9 in start_thread () from /lib/libpthread.so.0
No symbol table info available.
#5 0xf763a6ae in clone () from /lib/libc.so.6
No symbol table info available.
Thread 4 (Thread 0xf349db70 (LWP 9605)):
#0 0xf7723430 in __kernel_vsyscall ()
No symbol table info available.
#1 0xf76f94dc in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/libpthread.so.0
No symbol table info available.
#2 0x08050fd4 in queue_get (queue=0x92cb340) at mksquashfs.c:457
data = <value optimized out>
#3 0x08051241 in frag_deflator (arg=0x0) at mksquashfs.c:2413
compressed_size = 8789
file_buffer = 0xe64ebf8
write_buffer = 0xf0fa01d0
stream = 0xb3d18a0
oldstate = 0
#4 0xf76f4cc9 in start_thread () from /lib/libpthread.so.0
No symbol table info available.
#5 0xf763a6ae in clone () from /lib/libc.so.6
No symbol table info available.
Thread 3 (Thread 0xf2c9cb70 (LWP 9606)):
#0 0xf7723430 in __kernel_vsyscall ()
No symbol table info available.
#1 0xf76f94dc in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/libpthread.so.0
No symbol table info available.
#2 0x08050fd4 in queue_get (queue=0x92c60d8) at mksquashfs.c:457
data = <value optimized out>
#3 0x08051345 in deflator (arg=0x0) at mksquashfs.c:2375
write_buffer = 0xdb2cd60
stream = 0xb4143a0
oldstate = 0
#4 0xf76f4cc9 in start_thread () from /lib/libpthread.so.0
No symbol table info available.
#5 0xf763a6ae in clone () from /lib/libc.so.6
No symbol table info available.
Thread 2 (Thread 0xf249bb70 (LWP 9607)):
#0 0xf7723430 in __kernel_vsyscall ()
No symbol table info available.
#1 0xf76f94dc in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/libpthread.so.0
No symbol table info available.
#2 0x08050fd4 in queue_get (queue=0x92cb340) at mksquashfs.c:457
data = <value optimized out>
#3 0x08051241 in frag_deflator (arg=0x0) at mksquashfs.c:2413
compressed_size = 20408
file_buffer = 0xf791b68
write_buffer = 0xc709608
stream = 0xf0e204c0
oldstate = 0
#4 0xf76f4cc9 in start_thread () from /lib/libpthread.so.0
No symbol table info available.
#5 0xf763a6ae in clone () from /lib/libc.so.6
No symbol table info available.
Thread 1 (Thread 0xf75696c0 (LWP 9596)):
#0 0xf7723430 in __kernel_vsyscall ()
No symbol table info available.
#1 0xf760f8ec in sched_yield () from /lib/libc.so.6
No symbol table info available.
#2 0x08057a09 in main (argc=3, argv=<value optimized out>) at mksquashfs.c:4779
buf = {st_dev = 0, __pad1 = 0, __st_ino = 0, st_mode = 0, st_nlink = 0,
st_uid = 0, st_gid = 0, st_rdev = 0,
__pad2 = 0, st_size = 0, st_blksize = 0, st_blocks = 0, st_atim =
{tv_sec = 0, tv_nsec = 0}, st_mtim = {
tv_sec = 0, tv_nsec = 0}, st_ctim = {tv_sec = 0, tv_nsec = 0},
st_ino = 0}
source_buf = {st_dev = 21, __pad1 = 0, __st_ino = 293859759, st_mode =
16877, st_nlink = 21, st_uid = 0, st_gid = 0,
st_rdev = 0, __pad2 = 0, st_size = 460, st_blksize = 4096, st_blocks
= 0, st_atim = {tv_sec = 1301538668,
tv_nsec = 859741929}, st_mtim = {tv_sec = 1301539108, tv_nsec =
659745930}, st_ctim = {tv_sec = 1301539136,
tv_nsec = 59747352}, st_ino = 293859759}
i = <value optimized out>
sBlk = {s_magic = 1936814952, inodes = 131210, mkfs_time = 1301539226,
block_size = 131072, fragments = 5352,
compression = 0, block_log = 17, flags = 192, no_ids = 0, s_major =
4, s_minor = 0, root_inode = 84226939007,
bytes_used = 0, id_table_start = 0, xattr_table_start = 0,
inode_table_start = 0, directory_table_start = 0,
fragment_table_start = 0, lookup_table_start = 0}
b = 0x0
root_name = 0x0
nopad = 0
keep_as_directory = 0
inode = 84226939007
readb_mbytes = 64
writeb_mbytes = 512
fragmentb_mbytes = 64
s_minor = 0
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https://bugs.launchpad.net/bugs/722168
Title:
mksquashfs hangs
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