* PROBLEM: FUSE unmount breaks serial terminal line
@ 2006-08-20 18:05 Joerg Sommrey
2006-08-20 20:57 ` Miklos Szeredi
0 siblings, 1 reply; 9+ messages in thread
From: Joerg Sommrey @ 2006-08-20 18:05 UTC (permalink / raw)
To: Linux kernel mailing list
Hello,
something in FUSE breaks serial devices. I found this issue
using gphotofs, don't know if any other FUSE impementation has similar
effects. The problem is: from the moment the FUSE filesystem is unmounted,
a process that read()s on a serial device /dev/ttyS? gets an EOF
returncode.
Here is the tail of the output from "strace -tt cat /dev/ttyS0" when the
FUSE fs was unmounted:
19:41:46.513143 open("/dev/ttyS0", O_RDONLY|O_LARGEFILE) = 3
19:41:46.513373 fstat64(3, {st_mode=S_IFCHR|0660, st_rdev=makedev(4, 64), ...}) = 0
19:41:46.513552 read(3, "", 4096) = 0
19:42:49.854367 close(3) = 0
19:42:49.860663 close(1) = 0
19:42:49.860793 exit_group(0) = ?
Found this on x86 with kernels 2.6.16 and 2.6.17.
Any ideas?
-jo
--
-rw-r--r-- 1 jo users 62 2006-08-20 14:06 /home/jo/.signature
^ permalink raw reply [flat|nested] 9+ messages in thread* Re: PROBLEM: FUSE unmount breaks serial terminal line 2006-08-20 18:05 PROBLEM: FUSE unmount breaks serial terminal line Joerg Sommrey @ 2006-08-20 20:57 ` Miklos Szeredi 2006-08-20 21:28 ` Joerg Sommrey 0 siblings, 1 reply; 9+ messages in thread From: Miklos Szeredi @ 2006-08-20 20:57 UTC (permalink / raw) To: jo; +Cc: linux-kernel > something in FUSE breaks serial devices. I found this issue > using gphotofs, don't know if any other FUSE impementation has similar > effects. The problem is: from the moment the FUSE filesystem is unmounted, > a process that read()s on a serial device /dev/ttyS? gets an EOF > returncode. > > Here is the tail of the output from "strace -tt cat /dev/ttyS0" when the > FUSE fs was unmounted: > > 19:41:46.513143 open("/dev/ttyS0", O_RDONLY|O_LARGEFILE) = 3 > 19:41:46.513373 fstat64(3, {st_mode=S_IFCHR|0660, st_rdev=makedev(4, 64), ...}) = 0 > 19:41:46.513552 read(3, "", 4096) = 0 > 19:42:49.854367 close(3) = 0 > 19:42:49.860663 close(1) = 0 > 19:42:49.860793 exit_group(0) = ? > > Found this on x86 with kernels 2.6.16 and 2.6.17. > > Any ideas? Likely a userspace issue. Can you please attach a strace (strace -f -p `pidof gphotofs`) to the gphotofs process just before doing the unmount? Thanks, Miklos ^ permalink raw reply [flat|nested] 9+ messages in thread
* Re: PROBLEM: FUSE unmount breaks serial terminal line 2006-08-20 20:57 ` Miklos Szeredi @ 2006-08-20 21:28 ` Joerg Sommrey 2006-08-22 8:57 ` Miklos Szeredi 0 siblings, 1 reply; 9+ messages in thread From: Joerg Sommrey @ 2006-08-20 21:28 UTC (permalink / raw) To: Miklos Szeredi; +Cc: linux-kernel On Sun, Aug 20, 2006 at 10:57:43PM +0200, Miklos Szeredi wrote: > > something in FUSE breaks serial devices. I found this issue > > using gphotofs, don't know if any other FUSE impementation has similar > > effects. The problem is: from the moment the FUSE filesystem is unmounted, > > a process that read()s on a serial device /dev/ttyS? gets an EOF > > returncode. > > > > Here is the tail of the output from "strace -tt cat /dev/ttyS0" when the > > FUSE fs was unmounted: > > > > 19:41:46.513143 open("/dev/ttyS0", O_RDONLY|O_LARGEFILE) = 3 > > 19:41:46.513373 fstat64(3, {st_mode=S_IFCHR|0660, st_rdev=makedev(4, 64), ...}) = 0 > > 19:41:46.513552 read(3, "", 4096) = 0 > > 19:42:49.854367 close(3) = 0 > > 19:42:49.860663 close(1) = 0 > > 19:42:49.860793 exit_group(0) = ? > > > > Found this on x86 with kernels 2.6.16 and 2.6.17. > > > > Any ideas? > > Likely a userspace issue. Can you please attach a strace (strace -f > -p `pidof gphotofs`) to the gphotofs process just before doing the > unmount? Here it is together with the "cat" strace. cat receives EOF *after* fusermount has exited - if it matters. -jo bear:/home/jo:0# strace -tt -fp $(pidof gphotofs): 30050 23:16:29.665421 read(3, <unfinished ...> 30049 23:16:29.666004 read(3, <unfinished ...> 30050 23:16:41.749481 <... read resumed> 0xb745d008, 135168) = -1 ENODEV (No such device) 30049 23:16:41.750746 <... read resumed> 0xb7c7f008, 135168) = -1 ENODEV (No such device) 30050 23:16:41.750801 munmap(0xb745d000, 139264) = 0 30050 23:16:41.750895 tgkill(30049, 30049, SIGTERM) = 0 30050 23:16:41.750977 pause( <unfinished ...> 30049 23:16:41.751025 --- SIGTERM (Terminated) @ 0 (0) --- 30049 23:16:41.751198 sigreturn() = ? (mask now []) 30049 23:16:41.751341 munmap(0xb7c7f000, 139264) = 0 30049 23:16:41.751463 open("/etc/ld.so.cache", O_RDONLY) = 5 30049 23:16:41.751561 fstat64(5, {st_mode=S_IFREG|0644, st_size=106424, ...}) = 0 30049 23:16:41.751676 mmap2(NULL, 106424, PROT_READ, MAP_PRIVATE, 5, 0) = 0xb7c87000 30049 23:16:41.751762 close(5) = 0 30049 23:16:41.751830 access("/etc/ld.so.nohwcap", F_OK) = -1 ENOENT (No such file or directory) 30049 23:16:41.751933 open("/lib/libgcc_s.so.1", O_RDONLY) = 5 30049 23:16:41.752014 read(5, "\177ELF\1\1\1\0\0\0\0\0\0\0\0\0\3\0\3\0\1\0\0\0000\30\0"..., 512) = 512 30049 23:16:41.752136 fstat64(5, {st_mode=S_IFREG|0644, st_size=40328, ...}) = 0 30049 23:16:41.752257 mmap2(NULL, 43524, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 5, 0) = 0xb7f63000 30049 23:16:41.752332 mmap2(0xb7f6d000, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 5, 0x9) = 0xb7f6d000 30049 23:16:41.752426 close(5) = 0 30049 23:16:41.752557 munmap(0xb7c87000, 106424) = 0 30049 23:16:41.752650 tgkill(30049, 30050, SIGRTMIN <unfinished ...> 30050 23:16:41.752698 <... pause resumed> ) = ? ERESTARTNOHAND (To be restarted) 30049 23:16:41.752737 <... tgkill resumed> ) = 0 30050 23:16:41.752778 --- SIGRTMIN (Unknown signal 32) @ 0 (0) --- 30049 23:16:41.752962 futex(0xb7c7ebf8, FUTEX_WAIT, 30050, NULL <unfinished ...> 30050 23:16:41.753031 futex(0xb7f6d8e4, FUTEX_WAKE, 2147483647) = 0 30050 23:16:41.753167 _exit(0) = ? 30049 23:16:41.753475 <... futex resumed> ) = 0 30049 23:16:41.753554 rt_sigaction(SIGHUP, NULL, {0xb7f54d90, [], 0}, 8) = 0 30049 23:16:41.753647 rt_sigaction(SIGINT, NULL, {0xb7f54d90, [], 0}, 8) = 0 30049 23:16:41.753725 rt_sigaction(SIGTERM, NULL, {0xb7f54d90, [], 0}, 8) = 0 30049 23:16:41.753801 rt_sigaction(SIGPIPE, NULL, {SIG_IGN}, 8) = 0 30049 23:16:41.753881 vfork() = 30060 30049 23:16:41.754969 waitpid(30060, <unfinished ...> 30060 23:16:41.755873 execve("/home/jo/bin/fusermount", ["fusermount", "-u", "-q", "-z", "--", "/camera/"], [/* 46 vars */]) = -1 ENOENT (No such file or directory) 30060 23:16:41.756705 execve("/usr/local/bin/fusermount", ["fusermount", "-u", "-q", "-z", "--", "/camera/"], [/* 46 vars */]) = -1 ENOENT (No such file or directory) 30060 23:16:41.756931 execve("/usr/bin/fusermount", ["fusermount", "-u", "-q", "-z", "--", "/camera/"], [/* 46 vars */]) = 0 30060 23:16:41.757678 uname({sys="Linux", node="bear", ...}) = 0 30060 23:16:41.757934 brk(0) = 0x804e000 30060 23:16:41.758018 fcntl64(0, F_GETFD) = 0 30060 23:16:41.758126 fcntl64(1, F_GETFD) = 0 30060 23:16:41.758188 fcntl64(2, F_GETFD) = 0 30060 23:16:41.758270 access("/etc/suid-debug", F_OK) = -1 ENOENT (No such file or directory) 30060 23:16:41.758379 access("/etc/ld.so.nohwcap", F_OK) = -1 ENOENT (No such file or directory) 30060 23:16:41.758463 mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0xb7f0d000 30060 23:16:41.758545 access("/etc/ld.so.preload", R_OK) = -1 ENOENT (No such file or directory) 30060 23:16:41.758626 mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0xb7f0c000 30060 23:16:41.758719 open("/etc/ld.so.cache", O_RDONLY) = 5 30060 23:16:41.758804 fstat64(5, {st_mode=S_IFREG|0644, st_size=106424, ...}) = 0 30060 23:16:41.758914 mmap2(NULL, 106424, PROT_READ, MAP_PRIVATE, 5, 0) = 0xb7ef2000 30060 23:16:41.758980 close(5) = 0 30060 23:16:41.759077 access("/etc/ld.so.nohwcap", F_OK) = -1 ENOENT (No such file or directory) 30060 23:16:41.759175 open("/lib/tls/libc.so.6", O_RDONLY) = 5 30060 23:16:41.759344 read(5, "\177ELF\1\1\1\0\0\0\0\0\0\0\0\0\3\0\3\0\1\0\0\0\260O\1"..., 512) = 512 30060 23:16:41.759449 fstat64(5, {st_mode=S_IFREG|0755, st_size=1270928, ...}) = 0 30060 23:16:41.759559 mmap2(NULL, 1276892, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 5, 0) = 0xb7dba000 30060 23:16:41.759633 mmap2(0xb7ee8000, 32768, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 5, 0x12e) = 0xb7ee8000 30060 23:16:41.759739 mmap2(0xb7ef0000, 7132, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0xb7ef0000 30060 23:16:41.759826 close(5) = 0 30060 23:16:41.759920 mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0xb7db9000 30060 23:16:41.760244 mprotect(0xb7ee8000, 20480, PROT_READ) = 0 30060 23:16:41.760340 set_thread_area({entry_number:-1 -> 6, base_addr:0xb7db96c0, limit:1048575, seg_32bit:1, contents:0, read_exec_only:0, limit_in_pages:1, seg_not_present:0, useable:1}) = 0 30060 23:16:41.760434 munmap(0xb7ef2000, 106424) = 0 30060 23:16:41.760642 brk(0) = 0x804e000 30060 23:16:41.760712 brk(0x806f000) = 0x806f000 30060 23:16:41.760811 getuid32() = 1001 30060 23:16:41.760874 getuid32() = 1001 30060 23:16:41.760935 setfsuid32(1001) = 0 30060 23:16:41.761004 getgid32() = 100 30060 23:16:41.761101 setfsgid32(100) = 100 30060 23:16:41.761218 getuid32() = 1001 30060 23:16:41.761289 setfsuid32(0) = 1001 30060 23:16:41.761348 setfsgid32(100) = 100 30060 23:16:41.761413 umask(033) = 022 30060 23:16:41.761478 geteuid32() = 0 30060 23:16:41.761545 open("/etc/mtab.fuselock", O_RDWR|O_CREAT|O_LARGEFILE, 0600) = 5 30060 23:16:41.761645 fcntl64(5, F_SETLKW64, {type=F_WRLCK, whence=SEEK_CUR, start=0, len=0}, 0xbfd001c4) = 0 30060 23:16:41.761736 lstat64("/etc/mtab", {st_mode=S_IFREG|0644, st_size=1130, ...}) = 0 30060 23:16:41.761866 open("/etc/mtab", O_RDONLY) = 6 30060 23:16:41.761948 open("/etc/mtab~fuse~", O_WRONLY|O_CREAT|O_TRUNC, 0666) = 7 30060 23:16:41.762205 getuid32() = 1001 30060 23:16:41.762267 getuid32() = 1001 30060 23:16:41.762355 socket(PF_FILE, SOCK_STREAM, 0) = 8 30060 23:16:41.762445 fcntl64(8, F_GETFL) = 0x2 (flags O_RDWR) 30060 23:16:41.762512 fcntl64(8, F_SETFL, O_RDWR|O_NONBLOCK) = 0 30060 23:16:41.762579 connect(8, {sa_family=AF_FILE, path="/var/run/nscd/socket"}, 110) = -1 ENOENT (No such file or directory) 30060 23:16:41.762712 close(8) = 0 30060 23:16:41.762793 socket(PF_FILE, SOCK_STREAM, 0) = 8 30060 23:16:41.762860 fcntl64(8, F_GETFL) = 0x2 (flags O_RDWR) 30060 23:16:41.762924 fcntl64(8, F_SETFL, O_RDWR|O_NONBLOCK) = 0 30060 23:16:41.762988 connect(8, {sa_family=AF_FILE, path="/var/run/nscd/socket"}, 110) = -1 ENOENT (No such file or directory) 30060 23:16:41.763129 close(8) = 0 30060 23:16:41.763208 open("/etc/nsswitch.conf", O_RDONLY) = 8 30060 23:16:41.763306 fstat64(8, {st_mode=S_IFREG|0644, st_size=465, ...}) = 0 30060 23:16:41.763416 mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0xb7f0b000 30060 23:16:41.763497 read(8, "# /etc/nsswitch.conf\n#\n# Example"..., 4096) = 465 30060 23:16:41.763629 read(8, "", 4096) = 0 30060 23:16:41.763703 close(8) = 0 30060 23:16:41.763768 munmap(0xb7f0b000, 4096) = 0 30060 23:16:41.763883 open("/etc/ld.so.cache", O_RDONLY) = 8 30060 23:16:41.763965 fstat64(8, {st_mode=S_IFREG|0644, st_size=106424, ...}) = 0 30060 23:16:41.764098 mmap2(NULL, 106424, PROT_READ, MAP_PRIVATE, 8, 0) = 0xb7ef2000 30060 23:16:41.764169 close(8) = 0 30060 23:16:41.764235 access("/etc/ld.so.nohwcap", F_OK) = -1 ENOENT (No such file or directory) 30060 23:16:41.764332 open("/lib/tls/libnss_compat.so.2", O_RDONLY) = 8 30060 23:16:41.764420 read(8, "\177ELF\1\1\1\0\0\0\0\0\0\0\0\0\3\0\3\0\1\0\0\0\320\20"..., 512) = 512 30060 23:16:41.764516 fstat64(8, {st_mode=S_IFREG|0644, st_size=30428, ...}) = 0 30060 23:16:41.764627 mmap2(NULL, 33392, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 8, 0) = 0xb7db0000 30060 23:16:41.767519 mmap2(0xb7db7000, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 8, 0x6) = 0xb7db7000 30060 23:16:41.767873 close(8) = 0 30060 23:16:41.767979 access("/etc/ld.so.nohwcap", F_OK) = -1 ENOENT (No such file or directory) 30060 23:16:41.768135 open("/lib/tls/libnsl.so.1", O_RDONLY) = 8 30060 23:16:41.768244 read(8, "\177ELF\1\1\1\0\0\0\0\0\0\0\0\0\3\0\3\0\1\0\0\0\3405\0"..., 512) = 512 30060 23:16:41.768367 fstat64(8, {st_mode=S_IFREG|0644, st_size=80888, ...}) = 0 30060 23:16:41.768505 mmap2(NULL, 88096, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 8, 0) = 0xb7d9a000 30060 23:16:41.768591 mmap2(0xb7dac000, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 8, 0x12) = 0xb7dac000 30060 23:16:41.768697 mmap2(0xb7dae000, 6176, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0xb7dae000 30060 23:16:41.768788 close(8) = 0 30060 23:16:41.769004 munmap(0xb7ef2000, 106424) = 0 30060 23:16:41.769181 open("/etc/ld.so.cache", O_RDONLY) = 8 30060 23:16:41.769273 fstat64(8, {st_mode=S_IFREG|0644, st_size=106424, ...}) = 0 30060 23:16:41.769379 mmap2(NULL, 106424, PROT_READ, MAP_PRIVATE, 8, 0) = 0xb7ef2000 30060 23:16:41.769447 close(8) = 0 30060 23:16:41.769517 access("/etc/ld.so.nohwcap", F_OK) = -1 ENOENT (No such file or directory) 30060 23:16:41.769616 open("/lib/tls/libnss_nis.so.2", O_RDONLY) = 8 30060 23:16:41.769702 read(8, "\177ELF\1\1\1\0\0\0\0\0\0\0\0\0\3\0\3\0\1\0\0\0\200\34"..., 512) = 512 30060 23:16:41.769804 fstat64(8, {st_mode=S_IFREG|0644, st_size=38420, ...}) = 0 30060 23:16:41.769918 mmap2(NULL, 37424, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 8, 0) = 0xb7d90000 30060 23:16:41.769992 mmap2(0xb7d98000, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 8, 0x8) = 0xb7d98000 30060 23:16:41.770138 close(8) = 0 30060 23:16:41.770216 access("/etc/ld.so.nohwcap", F_OK) = -1 ENOENT (No such file or directory) 30060 23:16:41.770298 open("/lib/tls/libnss_files.so.2", O_RDONLY) = 8 30060 23:16:41.770386 read(8, "\177ELF\1\1\1\0\0\0\0\0\0\0\0\0\3\0\3\0\1\0\0\0\220\33"..., 512) = 512 30060 23:16:41.770481 fstat64(8, {st_mode=S_IFREG|0644, st_size=42472, ...}) = 0 30060 23:16:41.770590 mmap2(NULL, 45720, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 8, 0) = 0xb7d84000 30060 23:16:41.770664 mmap2(0xb7d8e000, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 8, 0x9) = 0xb7d8e000 30060 23:16:41.770779 close(8) = 0 30060 23:16:41.770911 munmap(0xb7ef2000, 106424) = 0 30060 23:16:41.771018 open("/etc/passwd", O_RDONLY) = 8 30060 23:16:41.771154 fcntl64(8, F_GETFD) = 0 30060 23:16:41.771222 fcntl64(8, F_SETFD, FD_CLOEXEC) = 0 30060 23:16:41.771302 _llseek(8, 0, [0], SEEK_CUR) = 0 30060 23:16:41.771382 fstat64(8, {st_mode=S_IFREG|0644, st_size=2244, ...}) = 0 30060 23:16:41.771487 mmap2(NULL, 2244, PROT_READ, MAP_SHARED, 8, 0) = 0xb7f0b000 30060 23:16:41.771556 _llseek(8, 2244, [2244], SEEK_SET) = 0 30060 23:16:41.771670 munmap(0xb7f0b000, 2244) = 0 30060 23:16:41.771737 close(8) = 0 30060 23:16:41.771806 getuid32() = 1001 30060 23:16:41.771902 fstat64(6, {st_mode=S_IFREG|0644, st_size=1130, ...}) = 0 30060 23:16:41.772013 mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0xb7f0b000 30060 23:16:41.772083 read(6, "/dev/sda1 / ext3 rw,noatime,acl,"..., 4096) = 1130 30060 23:16:41.773216 fstat64(7, {st_mode=S_IFREG|0644, st_size=0, ...}) = 0 30060 23:16:41.773354 mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0xb7f0a000 30060 23:16:41.773439 fstat64(7, {st_mode=S_IFREG|0644, st_size=0, ...}) = 0 30060 23:16:41.773545 _llseek(7, 0, [0], SEEK_SET) = 0 30060 23:16:41.773654 write(7, "/dev/sda1 / ext3 rw,noatime,acl,"..., 54) = 54 30060 23:16:41.774015 fstat64(7, {st_mode=S_IFREG|0644, st_size=54, ...}) = 0 30060 23:16:41.774168 _llseek(7, 54, [54], SEEK_SET) = 0 30060 23:16:41.774270 write(7, "proc /proc proc rw 0 0\n", 23) = 23 30060 23:16:41.774409 fstat64(7, {st_mode=S_IFREG|0644, st_size=77, ...}) = 0 30060 23:16:41.774516 _llseek(7, 77, [77], SEEK_SET) = 0 30060 23:16:41.774607 write(7, "sysfs /sys sysfs rw 0 0\n", 24) = 24 30060 23:16:41.774806 fstat64(7, {st_mode=S_IFREG|0644, st_size=101, ...}) = 0 30060 23:16:41.774912 _llseek(7, 101, [101], SEEK_SET) = 0 30060 23:16:41.775008 write(7, "usbfs /proc/bus/usb usbfs rw,dev"..., 46) = 46 30060 23:16:41.775163 fstat64(7, {st_mode=S_IFREG|0644, st_size=147, ...}) = 0 30060 23:16:41.775270 _llseek(7, 147, [147], SEEK_SET) = 0 30060 23:16:41.775361 write(7, "tmpfs /dev/shm tmpfs rw 0 0\n", 28) = 28 30060 23:16:41.775488 fstat64(7, {st_mode=S_IFREG|0644, st_size=175, ...}) = 0 30060 23:16:41.775594 _llseek(7, 175, [175], SEEK_SET) = 0 30060 23:16:41.775688 write(7, "devpts /dev/pts devpts rw,gid=5,"..., 45) = 45 30060 23:16:41.775817 fstat64(7, {st_mode=S_IFREG|0644, st_size=220, ...}) = 0 30060 23:16:41.775922 _llseek(7, 220, [220], SEEK_SET) = 0 30060 23:16:41.776020 write(7, "tmpfs /tmp tmpfs rw,mode=1777 0 "..., 34) = 34 30060 23:16:41.776170 fstat64(7, {st_mode=S_IFREG|0644, st_size=254, ...}) = 0 30060 23:16:41.776278 _llseek(7, 254, [254], SEEK_SET) = 0 30060 23:16:41.776374 write(7, "configfs /config configfs rw 0 0"..., 33) = 33 30060 23:16:41.776506 fstat64(7, {st_mode=S_IFREG|0644, st_size=287, ...}) = 0 30060 23:16:41.776613 _llseek(7, 287, [287], SEEK_SET) = 0 30060 23:16:41.776706 write(7, "/dev/mapper/vg2-usr /usr reiserf"..., 41) = 41 30060 23:16:41.776835 fstat64(7, {st_mode=S_IFREG|0644, st_size=328, ...}) = 0 30060 23:16:41.776942 _llseek(7, 328, [328], SEEK_SET) = 0 30060 23:16:41.777038 write(7, "/dev/mapper/vg2-src /usr/src rei"..., 45) = 45 30060 23:16:41.778805 fstat64(7, {st_mode=S_IFREG|0644, st_size=373, ...}) = 0 30060 23:16:41.779001 _llseek(7, 373, [373], SEEK_SET) = 0 30060 23:16:41.779172 write(7, "/dev/mapper/vg2-var /var reiserf"..., 46) = 46 30060 23:16:41.779398 fstat64(7, {st_mode=S_IFREG|0644, st_size=419, ...}) = 0 30060 23:16:41.779508 _llseek(7, 419, [419], SEEK_SET) = 0 30060 23:16:41.779606 write(7, "/dev/mapper/vg2-spool /var/spool"..., 49) = 49 30060 23:16:41.779743 fstat64(7, {st_mode=S_IFREG|0644, st_size=468, ...}) = 0 30060 23:16:41.779850 _llseek(7, 468, [468], SEEK_SET) = 0 30060 23:16:41.781483 write(7, "/dev/mapper/vg2-share /usr/share"..., 49) = 49 30060 23:16:41.781814 fstat64(7, {st_mode=S_IFREG|0644, st_size=517, ...}) = 0 30060 23:16:41.781934 _llseek(7, 517, [517], SEEK_SET) = 0 30060 23:16:41.782033 write(7, "/dev/mapper/vg2-local /usr/local"..., 49) = 49 30060 23:16:41.784486 fstat64(7, {st_mode=S_IFREG|0644, st_size=566, ...}) = 0 30060 23:16:41.784680 _llseek(7, 566, [566], SEEK_SET) = 0 30060 23:16:41.784816 write(7, "/dev/mapper/vg2-home /home reise"..., 43) = 43 30060 23:16:41.785066 fstat64(7, {st_mode=S_IFREG|0644, st_size=609, ...}) = 0 30060 23:16:41.785216 _llseek(7, 609, [609], SEEK_SET) = 0 30060 23:16:41.785312 write(7, "/dev/mapper/vg3-jo /home/jo reis"..., 44) = 44 30060 23:16:41.785448 fstat64(7, {st_mode=S_IFREG|0644, st_size=653, ...}) = 0 30060 23:16:41.785556 _llseek(7, 653, [653], SEEK_SET) = 0 30060 23:16:41.785650 write(7, "/dev/mapper/vg3-ragn /home/ragn "..., 48) = 48 30060 23:16:41.785780 fstat64(7, {st_mode=S_IFREG|0644, st_size=701, ...}) = 0 30060 23:16:41.785887 _llseek(7, 701, [701], SEEK_SET) = 0 30060 23:16:41.785981 write(7, "/dev/mapper/vg1-burn /burn reise"..., 43) = 43 30060 23:16:41.786133 fstat64(7, {st_mode=S_IFREG|0644, st_size=744, ...}) = 0 30060 23:16:41.786240 _llseek(7, 744, [744], SEEK_SET) = 0 30060 23:16:41.786334 write(7, "/dev/mapper/vg1-mmedia /mmedia r"..., 47) = 47 30060 23:16:41.786465 fstat64(7, {st_mode=S_IFREG|0644, st_size=791, ...}) = 0 30060 23:16:41.786572 _llseek(7, 791, [791], SEEK_SET) = 0 30060 23:16:41.786665 write(7, "/dev/mapper/vg2-opt /opt reiserf"..., 41) = 41 30060 23:16:41.786794 fstat64(7, {st_mode=S_IFREG|0644, st_size=832, ...}) = 0 30060 23:16:41.786901 _llseek(7, 832, [832], SEEK_SET) = 0 30060 23:16:41.787003 write(7, "/dev/mapper/vg4-backup /backup r"..., 47) = 47 30060 23:16:41.787151 fstat64(7, {st_mode=S_IFREG|0644, st_size=879, ...}) = 0 30060 23:16:41.787259 _llseek(7, 879, [879], SEEK_SET) = 0 30060 23:16:41.787353 write(7, "/dev/mapper/vg5-data /data reise"..., 43) = 43 30060 23:16:41.787580 fstat64(7, {st_mode=S_IFREG|0644, st_size=922, ...}) = 0 30060 23:16:41.787682 _llseek(7, 922, [922], SEEK_SET) = 0 30060 23:16:41.787773 write(7, "tmpfs /dev tmpfs rw,size=10M,mod"..., 43) = 43 30060 23:16:41.787898 fstat64(7, {st_mode=S_IFREG|0644, st_size=965, ...}) = 0 30060 23:16:41.788004 _llseek(7, 965, [965], SEEK_SET) = 0 30060 23:16:41.788116 write(7, "capifs /dev/capi capifs rw,mode="..., 41) = 41 30060 23:16:41.788244 fstat64(7, {st_mode=S_IFREG|0644, st_size=1006, ...}) = 0 30060 23:16:41.788345 _llseek(7, 1006, [1006], SEEK_SET) = 0 30060 23:16:41.788435 write(7, "binfmt_misc /proc/sys/fs/binfmt_"..., 56) = 56 30060 23:16:41.788602 fstat64(7, {st_mode=S_IFREG|0644, st_size=1062, ...}) = 0 30060 23:16:41.788704 _llseek(7, 1062, [1062], SEEK_SET) = 0 30060 23:16:41.788794 read(6, "", 4096) = 0 30060 23:16:41.788884 close(6) = 0 30060 23:16:41.788955 munmap(0xb7f0b000, 4096) = 0 30060 23:16:41.789054 write(7, "/dev/mapper/jo-crypt /home/jo/cr"..., 68) = 68 30060 23:16:41.790863 close(7) = 0 30060 23:16:41.790991 munmap(0xb7f0a000, 4096) = 0 30060 23:16:41.791166 unlink("/etc/mtab~fuse~") = 0 30060 23:16:41.791493 fcntl64(5, F_SETLK64, {type=F_UNLCK, whence=SEEK_CUR, start=0, len=0}, 0xbfd001c4) = 0 30060 23:16:41.791591 close(5) = 0 30060 23:16:41.791706 exit_group(1) = ? 30049 23:16:41.791923 <... waitpid resumed> NULL, 0) = 30060 30049 23:16:41.791966 --- SIGCHLD (Child exited) @ 0 (0) --- 30049 23:16:41.792443 gettimeofday({1156108601, 792490}, NULL) = 0 30049 23:16:41.792536 ioctl(4, USBDEVFS_SUBMITURB, 0xbfac5e84) = 0 30049 23:16:41.792652 ioctl(4, USBDEVFS_REAPURBNDELAY, 0xbfac5ec8) = -1 EAGAIN (Resource temporarily unavailable) 30049 23:16:41.792726 select(5, NULL, [4], NULL, {0, 1000}) = 0 (Timeout) 30049 23:16:41.793225 gettimeofday({1156108601, 793252}, NULL) = 0 30049 23:16:41.793289 ioctl(4, USBDEVFS_REAPURBNDELAY, 0xbfac5ec8) = -1 EAGAIN (Resource temporarily unavailable) 30049 23:16:41.793352 select(5, NULL, [], NULL, {0, 1000}) = 0 (Timeout) 30049 23:16:41.794143 gettimeofday({1156108601, 794171}, NULL) = 0 30049 23:16:41.794208 ioctl(4, USBDEVFS_REAPURBNDELAY, 0xbfac5ec8) = -1 EAGAIN (Resource temporarily unavailable) 30049 23:16:41.794270 select(5, NULL, [], NULL, {0, 1000}) = 0 (Timeout) 30049 23:16:41.796486 gettimeofday({1156108601, 796575}, NULL) = 0 30049 23:16:41.796626 ioctl(4, USBDEVFS_REAPURBNDELAY, 0xbfac5ec8) = 0 30049 23:16:41.796768 gettimeofday({1156108601, 796801}, NULL) = 0 30049 23:16:41.796841 ioctl(4, USBDEVFS_SUBMITURB, 0xbfac5e54) = 0 30049 23:16:41.796936 ioctl(4, USBDEVFS_REAPURBNDELAY, 0xbfac5e98) = -1 EAGAIN (Resource temporarily unavailable) 30049 23:16:41.797008 select(5, NULL, [4], NULL, {0, 1000}) = 0 (Timeout) 30049 23:16:41.798135 gettimeofday({1156108601, 798163}, NULL) = 0 30049 23:16:41.798201 ioctl(4, USBDEVFS_REAPURBNDELAY, 0xbfac5e98) = -1 EAGAIN (Resource temporarily unavailable) 30049 23:16:41.798264 select(5, NULL, [], NULL, {0, 1000}) = 0 (Timeout) 30049 23:16:41.799138 gettimeofday({1156108601, 799164}, NULL) = 0 30049 23:16:41.799200 ioctl(4, USBDEVFS_REAPURBNDELAY, 0xbfac5e98) = -1 EAGAIN (Resource temporarily unavailable) 30049 23:16:41.799263 select(5, NULL, [], NULL, {0, 1000}) = 0 (Timeout) 30049 23:16:41.800163 gettimeofday({1156108601, 800197}, NULL) = 0 30049 23:16:41.800235 ioctl(4, USBDEVFS_REAPURBNDELAY, 0xbfac5e98) = 0 30049 23:16:41.800407 ioctl(4, USBDEVFS_CLEAR_HALT, 0xbfac6fe4) = 0 30049 23:16:41.803593 ioctl(4, USBDEVFS_CLEAR_HALT, 0xbfac6fe4) = 0 30049 23:16:41.807399 ioctl(4, USBDEVFS_CLEAR_HALT, 0xbfac6fe4) = 0 30049 23:16:41.811526 ioctl(4, USBDEVFS_RELEASEINTERFACE, 0xbfac7004) = 0 30049 23:16:41.815468 close(4) = 0 30049 23:16:41.815601 munmap(0xb73fa000, 138608) = 0 30049 23:16:41.815821 munmap(0xb7f6e000, 12688) = 0 30049 23:16:41.815902 munmap(0xb73b9000, 32024) = 0 30049 23:16:41.816018 close(3) = 0 30049 23:16:41.816211 exit_group(1) = ? jo@bear:~:0$ strace -tt cat /dev/ttyS0 [...] 23:16:18.884163 open("/dev/ttyS0", O_RDONLY|O_LARGEFILE) = 3 23:16:18.884367 fstat64(3, {st_mode=S_IFCHR|0660, st_rdev=makedev(4, 64), ...}) = 0 23:16:18.884500 read(3, "", 4096) = 0 23:16:41.817019 close(3) = 0 23:16:41.817164 close(1) = 0 23:16:41.817260 exit_group(0) = ? ^ permalink raw reply [flat|nested] 9+ messages in thread
* Re: PROBLEM: FUSE unmount breaks serial terminal line 2006-08-20 21:28 ` Joerg Sommrey @ 2006-08-22 8:57 ` Miklos Szeredi 2006-08-22 15:59 ` Joerg Sommrey 0 siblings, 1 reply; 9+ messages in thread From: Miklos Szeredi @ 2006-08-22 8:57 UTC (permalink / raw) To: jo; +Cc: linux-kernel > > > something in FUSE breaks serial devices. I found this issue > > > using gphotofs, don't know if any other FUSE impementation has similar > > > effects. The problem is: from the moment the FUSE filesystem is unmounted, > > > a process that read()s on a serial device /dev/ttyS? gets an EOF > > > returncode. > > > > > > Here is the tail of the output from "strace -tt cat /dev/ttyS0" when the > > > FUSE fs was unmounted: > > > > > > 19:41:46.513143 open("/dev/ttyS0", O_RDONLY|O_LARGEFILE) = 3 > > > 19:41:46.513373 fstat64(3, {st_mode=S_IFCHR|0660, st_rdev=makedev(4, 64), ...}) = 0 > > > 19:41:46.513552 read(3, "", 4096) = 0 > > > 19:42:49.854367 close(3) = 0 > > > 19:42:49.860663 close(1) = 0 > > > 19:42:49.860793 exit_group(0) = ? > > > > > > Found this on x86 with kernels 2.6.16 and 2.6.17. > > > > > > Any ideas? > > > > Likely a userspace issue. Can you please attach a strace (strace -f > > -p `pidof gphotofs`) to the gphotofs process just before doing the > > unmount? > > Here it is together with the "cat" strace. cat receives EOF *after* > fusermount has exited - if it matters. Yes, I think it matters. I think one of those USBDEVFS ioctls might be responsible. These are probably invoked by the libgphoto2 cleanup routines called when the filesystem exits. Can you verify with a non-FUSE application (gphoto2, gtkam) that the same thing happens on exit? If it turns out, that libgphoto2 is responsible, you can forward the bug report to them. Thanks, Miklos > > -jo > > bear:/home/jo:0# strace -tt -fp $(pidof gphotofs): > 30050 23:16:29.665421 read(3, <unfinished ...> > 30049 23:16:29.666004 read(3, <unfinished ...> > 30050 23:16:41.749481 <... read resumed> 0xb745d008, 135168) = -1 ENODEV (No such device) > 30049 23:16:41.750746 <... read resumed> 0xb7c7f008, 135168) = -1 ENODEV (No such device) > 30050 23:16:41.750801 munmap(0xb745d000, 139264) = 0 > 30050 23:16:41.750895 tgkill(30049, 30049, SIGTERM) = 0 > 30050 23:16:41.750977 pause( <unfinished ...> > 30049 23:16:41.751025 --- SIGTERM (Terminated) @ 0 (0) --- > 30049 23:16:41.751198 sigreturn() = ? (mask now []) > 30049 23:16:41.751341 munmap(0xb7c7f000, 139264) = 0 > 30049 23:16:41.751463 open("/etc/ld.so.cache", O_RDONLY) = 5 > 30049 23:16:41.751561 fstat64(5, {st_mode=S_IFREG|0644, st_size=106424, ...}) = 0 > 30049 23:16:41.751676 mmap2(NULL, 106424, PROT_READ, MAP_PRIVATE, 5, 0) = 0xb7c87000 > 30049 23:16:41.751762 close(5) = 0 > 30049 23:16:41.751830 access("/etc/ld.so.nohwcap", F_OK) = -1 ENOENT (No such file or directory) > 30049 23:16:41.751933 open("/lib/libgcc_s.so.1", O_RDONLY) = 5 > 30049 23:16:41.752014 read(5, "\177ELF\1\1\1\0\0\0\0\0\0\0\0\0\3\0\3\0\1\0\0\0000\30\0"..., 512) = 512 > 30049 23:16:41.752136 fstat64(5, {st_mode=S_IFREG|0644, st_size=40328, ...}) = 0 > 30049 23:16:41.752257 mmap2(NULL, 43524, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 5, 0) = 0xb7f63000 > 30049 23:16:41.752332 mmap2(0xb7f6d000, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 5, 0x9) = 0xb7f6d000 > 30049 23:16:41.752426 close(5) = 0 > 30049 23:16:41.752557 munmap(0xb7c87000, 106424) = 0 > 30049 23:16:41.752650 tgkill(30049, 30050, SIGRTMIN <unfinished ...> > 30050 23:16:41.752698 <... pause resumed> ) = ? ERESTARTNOHAND (To be restarted) > 30049 23:16:41.752737 <... tgkill resumed> ) = 0 > 30050 23:16:41.752778 --- SIGRTMIN (Unknown signal 32) @ 0 (0) --- > 30049 23:16:41.752962 futex(0xb7c7ebf8, FUTEX_WAIT, 30050, NULL <unfinished ...> > 30050 23:16:41.753031 futex(0xb7f6d8e4, FUTEX_WAKE, 2147483647) = 0 > 30050 23:16:41.753167 _exit(0) = ? > 30049 23:16:41.753475 <... futex resumed> ) = 0 > 30049 23:16:41.753554 rt_sigaction(SIGHUP, NULL, {0xb7f54d90, [], 0}, 8) = 0 > 30049 23:16:41.753647 rt_sigaction(SIGINT, NULL, {0xb7f54d90, [], 0}, 8) = 0 > 30049 23:16:41.753725 rt_sigaction(SIGTERM, NULL, {0xb7f54d90, [], 0}, 8) = 0 > 30049 23:16:41.753801 rt_sigaction(SIGPIPE, NULL, {SIG_IGN}, 8) = 0 > 30049 23:16:41.753881 vfork() = 30060 > 30049 23:16:41.754969 waitpid(30060, <unfinished ...> > 30060 23:16:41.755873 execve("/home/jo/bin/fusermount", ["fusermount", "-u", "-q", "-z", "--", "/camera/"], [/* 46 vars */]) = -1 ENOENT (No such file or directory) > 30060 23:16:41.756705 execve("/usr/local/bin/fusermount", ["fusermount", "-u", "-q", "-z", "--", "/camera/"], [/* 46 vars */]) = -1 ENOENT (No such file or directory) > 30060 23:16:41.756931 execve("/usr/bin/fusermount", ["fusermount", "-u", "-q", "-z", "--", "/camera/"], [/* 46 vars */]) = 0 > 30060 23:16:41.757678 uname({sys="Linux", node="bear", ...}) = 0 > 30060 23:16:41.757934 brk(0) = 0x804e000 > 30060 23:16:41.758018 fcntl64(0, F_GETFD) = 0 > 30060 23:16:41.758126 fcntl64(1, F_GETFD) = 0 > 30060 23:16:41.758188 fcntl64(2, F_GETFD) = 0 > 30060 23:16:41.758270 access("/etc/suid-debug", F_OK) = -1 ENOENT (No such file or directory) > 30060 23:16:41.758379 access("/etc/ld.so.nohwcap", F_OK) = -1 ENOENT (No such file or directory) > 30060 23:16:41.758463 mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0xb7f0d000 > 30060 23:16:41.758545 access("/etc/ld.so.preload", R_OK) = -1 ENOENT (No such file or directory) > 30060 23:16:41.758626 mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0xb7f0c000 > 30060 23:16:41.758719 open("/etc/ld.so.cache", O_RDONLY) = 5 > 30060 23:16:41.758804 fstat64(5, {st_mode=S_IFREG|0644, st_size=106424, ...}) = 0 > 30060 23:16:41.758914 mmap2(NULL, 106424, PROT_READ, MAP_PRIVATE, 5, 0) = 0xb7ef2000 > 30060 23:16:41.758980 close(5) = 0 > 30060 23:16:41.759077 access("/etc/ld.so.nohwcap", F_OK) = -1 ENOENT (No such file or directory) > 30060 23:16:41.759175 open("/lib/tls/libc.so.6", O_RDONLY) = 5 > 30060 23:16:41.759344 read(5, "\177ELF\1\1\1\0\0\0\0\0\0\0\0\0\3\0\3\0\1\0\0\0\260O\1"..., 512) = 512 > 30060 23:16:41.759449 fstat64(5, {st_mode=S_IFREG|0755, st_size=1270928, ...}) = 0 > 30060 23:16:41.759559 mmap2(NULL, 1276892, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 5, 0) = 0xb7dba000 > 30060 23:16:41.759633 mmap2(0xb7ee8000, 32768, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 5, 0x12e) = 0xb7ee8000 > 30060 23:16:41.759739 mmap2(0xb7ef0000, 7132, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0xb7ef0000 > 30060 23:16:41.759826 close(5) = 0 > 30060 23:16:41.759920 mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0xb7db9000 > 30060 23:16:41.760244 mprotect(0xb7ee8000, 20480, PROT_READ) = 0 > 30060 23:16:41.760340 set_thread_area({entry_number:-1 -> 6, base_addr:0xb7db96c0, limit:1048575, seg_32bit:1, contents:0, read_exec_only:0, limit_in_pages:1, seg_not_present:0, useable:1}) = 0 > 30060 23:16:41.760434 munmap(0xb7ef2000, 106424) = 0 > 30060 23:16:41.760642 brk(0) = 0x804e000 > 30060 23:16:41.760712 brk(0x806f000) = 0x806f000 > 30060 23:16:41.760811 getuid32() = 1001 > 30060 23:16:41.760874 getuid32() = 1001 > 30060 23:16:41.760935 setfsuid32(1001) = 0 > 30060 23:16:41.761004 getgid32() = 100 > 30060 23:16:41.761101 setfsgid32(100) = 100 > 30060 23:16:41.761218 getuid32() = 1001 > 30060 23:16:41.761289 setfsuid32(0) = 1001 > 30060 23:16:41.761348 setfsgid32(100) = 100 > 30060 23:16:41.761413 umask(033) = 022 > 30060 23:16:41.761478 geteuid32() = 0 > 30060 23:16:41.761545 open("/etc/mtab.fuselock", O_RDWR|O_CREAT|O_LARGEFILE, 0600) = 5 > 30060 23:16:41.761645 fcntl64(5, F_SETLKW64, {type=F_WRLCK, whence=SEEK_CUR, start=0, len=0}, 0xbfd001c4) = 0 > 30060 23:16:41.761736 lstat64("/etc/mtab", {st_mode=S_IFREG|0644, st_size=1130, ...}) = 0 > 30060 23:16:41.761866 open("/etc/mtab", O_RDONLY) = 6 > 30060 23:16:41.761948 open("/etc/mtab~fuse~", O_WRONLY|O_CREAT|O_TRUNC, 0666) = 7 > 30060 23:16:41.762205 getuid32() = 1001 > 30060 23:16:41.762267 getuid32() = 1001 > 30060 23:16:41.762355 socket(PF_FILE, SOCK_STREAM, 0) = 8 > 30060 23:16:41.762445 fcntl64(8, F_GETFL) = 0x2 (flags O_RDWR) > 30060 23:16:41.762512 fcntl64(8, F_SETFL, O_RDWR|O_NONBLOCK) = 0 > 30060 23:16:41.762579 connect(8, {sa_family=AF_FILE, path="/var/run/nscd/socket"}, 110) = -1 ENOENT (No such file or directory) > 30060 23:16:41.762712 close(8) = 0 > 30060 23:16:41.762793 socket(PF_FILE, SOCK_STREAM, 0) = 8 > 30060 23:16:41.762860 fcntl64(8, F_GETFL) = 0x2 (flags O_RDWR) > 30060 23:16:41.762924 fcntl64(8, F_SETFL, O_RDWR|O_NONBLOCK) = 0 > 30060 23:16:41.762988 connect(8, {sa_family=AF_FILE, path="/var/run/nscd/socket"}, 110) = -1 ENOENT (No such file or directory) > 30060 23:16:41.763129 close(8) = 0 > 30060 23:16:41.763208 open("/etc/nsswitch.conf", O_RDONLY) = 8 > 30060 23:16:41.763306 fstat64(8, {st_mode=S_IFREG|0644, st_size=465, ...}) = 0 > 30060 23:16:41.763416 mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0xb7f0b000 > 30060 23:16:41.763497 read(8, "# /etc/nsswitch.conf\n#\n# Example"..., 4096) = 465 > 30060 23:16:41.763629 read(8, "", 4096) = 0 > 30060 23:16:41.763703 close(8) = 0 > 30060 23:16:41.763768 munmap(0xb7f0b000, 4096) = 0 > 30060 23:16:41.763883 open("/etc/ld.so.cache", O_RDONLY) = 8 > 30060 23:16:41.763965 fstat64(8, {st_mode=S_IFREG|0644, st_size=106424, ...}) = 0 > 30060 23:16:41.764098 mmap2(NULL, 106424, PROT_READ, MAP_PRIVATE, 8, 0) = 0xb7ef2000 > 30060 23:16:41.764169 close(8) = 0 > 30060 23:16:41.764235 access("/etc/ld.so.nohwcap", F_OK) = -1 ENOENT (No such file or directory) > 30060 23:16:41.764332 open("/lib/tls/libnss_compat.so.2", O_RDONLY) = 8 > 30060 23:16:41.764420 read(8, "\177ELF\1\1\1\0\0\0\0\0\0\0\0\0\3\0\3\0\1\0\0\0\320\20"..., 512) = 512 > 30060 23:16:41.764516 fstat64(8, {st_mode=S_IFREG|0644, st_size=30428, ...}) = 0 > 30060 23:16:41.764627 mmap2(NULL, 33392, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 8, 0) = 0xb7db0000 > 30060 23:16:41.767519 mmap2(0xb7db7000, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 8, 0x6) = 0xb7db7000 > 30060 23:16:41.767873 close(8) = 0 > 30060 23:16:41.767979 access("/etc/ld.so.nohwcap", F_OK) = -1 ENOENT (No such file or directory) > 30060 23:16:41.768135 open("/lib/tls/libnsl.so.1", O_RDONLY) = 8 > 30060 23:16:41.768244 read(8, "\177ELF\1\1\1\0\0\0\0\0\0\0\0\0\3\0\3\0\1\0\0\0\3405\0"..., 512) = 512 > 30060 23:16:41.768367 fstat64(8, {st_mode=S_IFREG|0644, st_size=80888, ...}) = 0 > 30060 23:16:41.768505 mmap2(NULL, 88096, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 8, 0) = 0xb7d9a000 > 30060 23:16:41.768591 mmap2(0xb7dac000, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 8, 0x12) = 0xb7dac000 > 30060 23:16:41.768697 mmap2(0xb7dae000, 6176, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0xb7dae000 > 30060 23:16:41.768788 close(8) = 0 > 30060 23:16:41.769004 munmap(0xb7ef2000, 106424) = 0 > 30060 23:16:41.769181 open("/etc/ld.so.cache", O_RDONLY) = 8 > 30060 23:16:41.769273 fstat64(8, {st_mode=S_IFREG|0644, st_size=106424, ...}) = 0 > 30060 23:16:41.769379 mmap2(NULL, 106424, PROT_READ, MAP_PRIVATE, 8, 0) = 0xb7ef2000 > 30060 23:16:41.769447 close(8) = 0 > 30060 23:16:41.769517 access("/etc/ld.so.nohwcap", F_OK) = -1 ENOENT (No such file or directory) > 30060 23:16:41.769616 open("/lib/tls/libnss_nis.so.2", O_RDONLY) = 8 > 30060 23:16:41.769702 read(8, "\177ELF\1\1\1\0\0\0\0\0\0\0\0\0\3\0\3\0\1\0\0\0\200\34"..., 512) = 512 > 30060 23:16:41.769804 fstat64(8, {st_mode=S_IFREG|0644, st_size=38420, ...}) = 0 > 30060 23:16:41.769918 mmap2(NULL, 37424, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 8, 0) = 0xb7d90000 > 30060 23:16:41.769992 mmap2(0xb7d98000, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 8, 0x8) = 0xb7d98000 > 30060 23:16:41.770138 close(8) = 0 > 30060 23:16:41.770216 access("/etc/ld.so.nohwcap", F_OK) = -1 ENOENT (No such file or directory) > 30060 23:16:41.770298 open("/lib/tls/libnss_files.so.2", O_RDONLY) = 8 > 30060 23:16:41.770386 read(8, "\177ELF\1\1\1\0\0\0\0\0\0\0\0\0\3\0\3\0\1\0\0\0\220\33"..., 512) = 512 > 30060 23:16:41.770481 fstat64(8, {st_mode=S_IFREG|0644, st_size=42472, ...}) = 0 > 30060 23:16:41.770590 mmap2(NULL, 45720, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 8, 0) = 0xb7d84000 > 30060 23:16:41.770664 mmap2(0xb7d8e000, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 8, 0x9) = 0xb7d8e000 > 30060 23:16:41.770779 close(8) = 0 > 30060 23:16:41.770911 munmap(0xb7ef2000, 106424) = 0 > 30060 23:16:41.771018 open("/etc/passwd", O_RDONLY) = 8 > 30060 23:16:41.771154 fcntl64(8, F_GETFD) = 0 > 30060 23:16:41.771222 fcntl64(8, F_SETFD, FD_CLOEXEC) = 0 > 30060 23:16:41.771302 _llseek(8, 0, [0], SEEK_CUR) = 0 > 30060 23:16:41.771382 fstat64(8, {st_mode=S_IFREG|0644, st_size=2244, ...}) = 0 > 30060 23:16:41.771487 mmap2(NULL, 2244, PROT_READ, MAP_SHARED, 8, 0) = 0xb7f0b000 > 30060 23:16:41.771556 _llseek(8, 2244, [2244], SEEK_SET) = 0 > 30060 23:16:41.771670 munmap(0xb7f0b000, 2244) = 0 > 30060 23:16:41.771737 close(8) = 0 > 30060 23:16:41.771806 getuid32() = 1001 > 30060 23:16:41.771902 fstat64(6, {st_mode=S_IFREG|0644, st_size=1130, ...}) = 0 > 30060 23:16:41.772013 mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0xb7f0b000 > 30060 23:16:41.772083 read(6, "/dev/sda1 / ext3 rw,noatime,acl,"..., 4096) = 1130 > 30060 23:16:41.773216 fstat64(7, {st_mode=S_IFREG|0644, st_size=0, ...}) = 0 > 30060 23:16:41.773354 mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0xb7f0a000 > 30060 23:16:41.773439 fstat64(7, {st_mode=S_IFREG|0644, st_size=0, ...}) = 0 > 30060 23:16:41.773545 _llseek(7, 0, [0], SEEK_SET) = 0 > 30060 23:16:41.773654 write(7, "/dev/sda1 / ext3 rw,noatime,acl,"..., 54) = 54 > 30060 23:16:41.774015 fstat64(7, {st_mode=S_IFREG|0644, st_size=54, ...}) = 0 > 30060 23:16:41.774168 _llseek(7, 54, [54], SEEK_SET) = 0 > 30060 23:16:41.774270 write(7, "proc /proc proc rw 0 0\n", 23) = 23 > 30060 23:16:41.774409 fstat64(7, {st_mode=S_IFREG|0644, st_size=77, ...}) = 0 > 30060 23:16:41.774516 _llseek(7, 77, [77], SEEK_SET) = 0 > 30060 23:16:41.774607 write(7, "sysfs /sys sysfs rw 0 0\n", 24) = 24 > 30060 23:16:41.774806 fstat64(7, {st_mode=S_IFREG|0644, st_size=101, ...}) = 0 > 30060 23:16:41.774912 _llseek(7, 101, [101], SEEK_SET) = 0 > 30060 23:16:41.775008 write(7, "usbfs /proc/bus/usb usbfs rw,dev"..., 46) = 46 > 30060 23:16:41.775163 fstat64(7, {st_mode=S_IFREG|0644, st_size=147, ...}) = 0 > 30060 23:16:41.775270 _llseek(7, 147, [147], SEEK_SET) = 0 > 30060 23:16:41.775361 write(7, "tmpfs /dev/shm tmpfs rw 0 0\n", 28) = 28 > 30060 23:16:41.775488 fstat64(7, {st_mode=S_IFREG|0644, st_size=175, ...}) = 0 > 30060 23:16:41.775594 _llseek(7, 175, [175], SEEK_SET) = 0 > 30060 23:16:41.775688 write(7, "devpts /dev/pts devpts rw,gid=5,"..., 45) = 45 > 30060 23:16:41.775817 fstat64(7, {st_mode=S_IFREG|0644, st_size=220, ...}) = 0 > 30060 23:16:41.775922 _llseek(7, 220, [220], SEEK_SET) = 0 > 30060 23:16:41.776020 write(7, "tmpfs /tmp tmpfs rw,mode=1777 0 "..., 34) = 34 > 30060 23:16:41.776170 fstat64(7, {st_mode=S_IFREG|0644, st_size=254, ...}) = 0 > 30060 23:16:41.776278 _llseek(7, 254, [254], SEEK_SET) = 0 > 30060 23:16:41.776374 write(7, "configfs /config configfs rw 0 0"..., 33) = 33 > 30060 23:16:41.776506 fstat64(7, {st_mode=S_IFREG|0644, st_size=287, ...}) = 0 > 30060 23:16:41.776613 _llseek(7, 287, [287], SEEK_SET) = 0 > 30060 23:16:41.776706 write(7, "/dev/mapper/vg2-usr /usr reiserf"..., 41) = 41 > 30060 23:16:41.776835 fstat64(7, {st_mode=S_IFREG|0644, st_size=328, ...}) = 0 > 30060 23:16:41.776942 _llseek(7, 328, [328], SEEK_SET) = 0 > 30060 23:16:41.777038 write(7, "/dev/mapper/vg2-src /usr/src rei"..., 45) = 45 > 30060 23:16:41.778805 fstat64(7, {st_mode=S_IFREG|0644, st_size=373, ...}) = 0 > 30060 23:16:41.779001 _llseek(7, 373, [373], SEEK_SET) = 0 > 30060 23:16:41.779172 write(7, "/dev/mapper/vg2-var /var reiserf"..., 46) = 46 > 30060 23:16:41.779398 fstat64(7, {st_mode=S_IFREG|0644, st_size=419, ...}) = 0 > 30060 23:16:41.779508 _llseek(7, 419, [419], SEEK_SET) = 0 > 30060 23:16:41.779606 write(7, "/dev/mapper/vg2-spool /var/spool"..., 49) = 49 > 30060 23:16:41.779743 fstat64(7, {st_mode=S_IFREG|0644, st_size=468, ...}) = 0 > 30060 23:16:41.779850 _llseek(7, 468, [468], SEEK_SET) = 0 > 30060 23:16:41.781483 write(7, "/dev/mapper/vg2-share /usr/share"..., 49) = 49 > 30060 23:16:41.781814 fstat64(7, {st_mode=S_IFREG|0644, st_size=517, ...}) = 0 > 30060 23:16:41.781934 _llseek(7, 517, [517], SEEK_SET) = 0 > 30060 23:16:41.782033 write(7, "/dev/mapper/vg2-local /usr/local"..., 49) = 49 > 30060 23:16:41.784486 fstat64(7, {st_mode=S_IFREG|0644, st_size=566, ...}) = 0 > 30060 23:16:41.784680 _llseek(7, 566, [566], SEEK_SET) = 0 > 30060 23:16:41.784816 write(7, "/dev/mapper/vg2-home /home reise"..., 43) = 43 > 30060 23:16:41.785066 fstat64(7, {st_mode=S_IFREG|0644, st_size=609, ...}) = 0 > 30060 23:16:41.785216 _llseek(7, 609, [609], SEEK_SET) = 0 > 30060 23:16:41.785312 write(7, "/dev/mapper/vg3-jo /home/jo reis"..., 44) = 44 > 30060 23:16:41.785448 fstat64(7, {st_mode=S_IFREG|0644, st_size=653, ...}) = 0 > 30060 23:16:41.785556 _llseek(7, 653, [653], SEEK_SET) = 0 > 30060 23:16:41.785650 write(7, "/dev/mapper/vg3-ragn /home/ragn "..., 48) = 48 > 30060 23:16:41.785780 fstat64(7, {st_mode=S_IFREG|0644, st_size=701, ...}) = 0 > 30060 23:16:41.785887 _llseek(7, 701, [701], SEEK_SET) = 0 > 30060 23:16:41.785981 write(7, "/dev/mapper/vg1-burn /burn reise"..., 43) = 43 > 30060 23:16:41.786133 fstat64(7, {st_mode=S_IFREG|0644, st_size=744, ...}) = 0 > 30060 23:16:41.786240 _llseek(7, 744, [744], SEEK_SET) = 0 > 30060 23:16:41.786334 write(7, "/dev/mapper/vg1-mmedia /mmedia r"..., 47) = 47 > 30060 23:16:41.786465 fstat64(7, {st_mode=S_IFREG|0644, st_size=791, ...}) = 0 > 30060 23:16:41.786572 _llseek(7, 791, [791], SEEK_SET) = 0 > 30060 23:16:41.786665 write(7, "/dev/mapper/vg2-opt /opt reiserf"..., 41) = 41 > 30060 23:16:41.786794 fstat64(7, {st_mode=S_IFREG|0644, st_size=832, ...}) = 0 > 30060 23:16:41.786901 _llseek(7, 832, [832], SEEK_SET) = 0 > 30060 23:16:41.787003 write(7, "/dev/mapper/vg4-backup /backup r"..., 47) = 47 > 30060 23:16:41.787151 fstat64(7, {st_mode=S_IFREG|0644, st_size=879, ...}) = 0 > 30060 23:16:41.787259 _llseek(7, 879, [879], SEEK_SET) = 0 > 30060 23:16:41.787353 write(7, "/dev/mapper/vg5-data /data reise"..., 43) = 43 > 30060 23:16:41.787580 fstat64(7, {st_mode=S_IFREG|0644, st_size=922, ...}) = 0 > 30060 23:16:41.787682 _llseek(7, 922, [922], SEEK_SET) = 0 > 30060 23:16:41.787773 write(7, "tmpfs /dev tmpfs rw,size=10M,mod"..., 43) = 43 > 30060 23:16:41.787898 fstat64(7, {st_mode=S_IFREG|0644, st_size=965, ...}) = 0 > 30060 23:16:41.788004 _llseek(7, 965, [965], SEEK_SET) = 0 > 30060 23:16:41.788116 write(7, "capifs /dev/capi capifs rw,mode="..., 41) = 41 > 30060 23:16:41.788244 fstat64(7, {st_mode=S_IFREG|0644, st_size=1006, ...}) = 0 > 30060 23:16:41.788345 _llseek(7, 1006, [1006], SEEK_SET) = 0 > 30060 23:16:41.788435 write(7, "binfmt_misc /proc/sys/fs/binfmt_"..., 56) = 56 > 30060 23:16:41.788602 fstat64(7, {st_mode=S_IFREG|0644, st_size=1062, ...}) = 0 > 30060 23:16:41.788704 _llseek(7, 1062, [1062], SEEK_SET) = 0 > 30060 23:16:41.788794 read(6, "", 4096) = 0 > 30060 23:16:41.788884 close(6) = 0 > 30060 23:16:41.788955 munmap(0xb7f0b000, 4096) = 0 > 30060 23:16:41.789054 write(7, "/dev/mapper/jo-crypt /home/jo/cr"..., 68) = 68 > 30060 23:16:41.790863 close(7) = 0 > 30060 23:16:41.790991 munmap(0xb7f0a000, 4096) = 0 > 30060 23:16:41.791166 unlink("/etc/mtab~fuse~") = 0 > 30060 23:16:41.791493 fcntl64(5, F_SETLK64, {type=F_UNLCK, whence=SEEK_CUR, start=0, len=0}, 0xbfd001c4) = 0 > 30060 23:16:41.791591 close(5) = 0 > 30060 23:16:41.791706 exit_group(1) = ? > 30049 23:16:41.791923 <... waitpid resumed> NULL, 0) = 30060 > 30049 23:16:41.791966 --- SIGCHLD (Child exited) @ 0 (0) --- > 30049 23:16:41.792443 gettimeofday({1156108601, 792490}, NULL) = 0 > 30049 23:16:41.792536 ioctl(4, USBDEVFS_SUBMITURB, 0xbfac5e84) = 0 > 30049 23:16:41.792652 ioctl(4, USBDEVFS_REAPURBNDELAY, 0xbfac5ec8) = -1 EAGAIN (Resource temporarily unavailable) > 30049 23:16:41.792726 select(5, NULL, [4], NULL, {0, 1000}) = 0 (Timeout) > 30049 23:16:41.793225 gettimeofday({1156108601, 793252}, NULL) = 0 > 30049 23:16:41.793289 ioctl(4, USBDEVFS_REAPURBNDELAY, 0xbfac5ec8) = -1 EAGAIN (Resource temporarily unavailable) > 30049 23:16:41.793352 select(5, NULL, [], NULL, {0, 1000}) = 0 (Timeout) > 30049 23:16:41.794143 gettimeofday({1156108601, 794171}, NULL) = 0 > 30049 23:16:41.794208 ioctl(4, USBDEVFS_REAPURBNDELAY, 0xbfac5ec8) = -1 EAGAIN (Resource temporarily unavailable) > 30049 23:16:41.794270 select(5, NULL, [], NULL, {0, 1000}) = 0 (Timeout) > 30049 23:16:41.796486 gettimeofday({1156108601, 796575}, NULL) = 0 > 30049 23:16:41.796626 ioctl(4, USBDEVFS_REAPURBNDELAY, 0xbfac5ec8) = 0 > 30049 23:16:41.796768 gettimeofday({1156108601, 796801}, NULL) = 0 > 30049 23:16:41.796841 ioctl(4, USBDEVFS_SUBMITURB, 0xbfac5e54) = 0 > 30049 23:16:41.796936 ioctl(4, USBDEVFS_REAPURBNDELAY, 0xbfac5e98) = -1 EAGAIN (Resource temporarily unavailable) > 30049 23:16:41.797008 select(5, NULL, [4], NULL, {0, 1000}) = 0 (Timeout) > 30049 23:16:41.798135 gettimeofday({1156108601, 798163}, NULL) = 0 > 30049 23:16:41.798201 ioctl(4, USBDEVFS_REAPURBNDELAY, 0xbfac5e98) = -1 EAGAIN (Resource temporarily unavailable) > 30049 23:16:41.798264 select(5, NULL, [], NULL, {0, 1000}) = 0 (Timeout) > 30049 23:16:41.799138 gettimeofday({1156108601, 799164}, NULL) = 0 > 30049 23:16:41.799200 ioctl(4, USBDEVFS_REAPURBNDELAY, 0xbfac5e98) = -1 EAGAIN (Resource temporarily unavailable) > 30049 23:16:41.799263 select(5, NULL, [], NULL, {0, 1000}) = 0 (Timeout) > 30049 23:16:41.800163 gettimeofday({1156108601, 800197}, NULL) = 0 > 30049 23:16:41.800235 ioctl(4, USBDEVFS_REAPURBNDELAY, 0xbfac5e98) = 0 > 30049 23:16:41.800407 ioctl(4, USBDEVFS_CLEAR_HALT, 0xbfac6fe4) = 0 > 30049 23:16:41.803593 ioctl(4, USBDEVFS_CLEAR_HALT, 0xbfac6fe4) = 0 > 30049 23:16:41.807399 ioctl(4, USBDEVFS_CLEAR_HALT, 0xbfac6fe4) = 0 > 30049 23:16:41.811526 ioctl(4, USBDEVFS_RELEASEINTERFACE, 0xbfac7004) = 0 > 30049 23:16:41.815468 close(4) = 0 > 30049 23:16:41.815601 munmap(0xb73fa000, 138608) = 0 > 30049 23:16:41.815821 munmap(0xb7f6e000, 12688) = 0 > 30049 23:16:41.815902 munmap(0xb73b9000, 32024) = 0 > 30049 23:16:41.816018 close(3) = 0 > 30049 23:16:41.816211 exit_group(1) = ? > > jo@bear:~:0$ strace -tt cat /dev/ttyS0 > [...] > 23:16:18.884163 open("/dev/ttyS0", O_RDONLY|O_LARGEFILE) = 3 > 23:16:18.884367 fstat64(3, {st_mode=S_IFCHR|0660, st_rdev=makedev(4, 64), ...}) = 0 > 23:16:18.884500 read(3, "", 4096) = 0 > 23:16:41.817019 close(3) = 0 > 23:16:41.817164 close(1) = 0 > 23:16:41.817260 exit_group(0) = ? > ^ permalink raw reply [flat|nested] 9+ messages in thread
* Re: PROBLEM: FUSE unmount breaks serial terminal line 2006-08-22 8:57 ` Miklos Szeredi @ 2006-08-22 15:59 ` Joerg Sommrey 2006-08-22 16:07 ` Miklos Szeredi 0 siblings, 1 reply; 9+ messages in thread From: Joerg Sommrey @ 2006-08-22 15:59 UTC (permalink / raw) To: Miklos Szeredi; +Cc: linux-kernel On Tue, Aug 22, 2006 at 10:57:15AM +0200, Miklos Szeredi wrote: > > > > something in FUSE breaks serial devices. I found this issue > > > > using gphotofs, don't know if any other FUSE impementation has similar > > > > effects. The problem is: from the moment the FUSE filesystem is unmounted, > > > > a process that read()s on a serial device /dev/ttyS? gets an EOF > > > > returncode. > > > > > > > > Here is the tail of the output from "strace -tt cat /dev/ttyS0" when the > > > > FUSE fs was unmounted: > > > > > > > > 19:41:46.513143 open("/dev/ttyS0", O_RDONLY|O_LARGEFILE) = 3 > > > > 19:41:46.513373 fstat64(3, {st_mode=S_IFCHR|0660, st_rdev=makedev(4, 64), ...}) = 0 > > > > 19:41:46.513552 read(3, "", 4096) = 0 > > > > 19:42:49.854367 close(3) = 0 > > > > 19:42:49.860663 close(1) = 0 > > > > 19:42:49.860793 exit_group(0) = ? > > > > > > > > Found this on x86 with kernels 2.6.16 and 2.6.17. > > > > > > > > Any ideas? > > > > > > Likely a userspace issue. Can you please attach a strace (strace -f > > > -p `pidof gphotofs`) to the gphotofs process just before doing the > > > unmount? > > > > Here it is together with the "cat" strace. cat receives EOF *after* > > fusermount has exited - if it matters. > > Yes, I think it matters. I think one of those USBDEVFS ioctls might > be responsible. These are probably invoked by the libgphoto2 cleanup > routines called when the filesystem exits. > > Can you verify with a non-FUSE application (gphoto2, gtkam) that the > same thing happens on exit? > Tested both gphoto2 and gtkam without any problems. There is no impact on the serial lines. NB: The *real* trouble I have is with ntpd and a reference clock attached to /dev/ttyS1. ntpd enters a busy loop reading ttyS1, stops working and eats up 100% CPU. Thanks for your investigations. Any other idea? -jo -- -rw-r--r-- 1 jo users 62 2006-08-22 17:50 /home/jo/.signature ^ permalink raw reply [flat|nested] 9+ messages in thread
* Re: PROBLEM: FUSE unmount breaks serial terminal line 2006-08-22 15:59 ` Joerg Sommrey @ 2006-08-22 16:07 ` Miklos Szeredi 2006-08-22 17:43 ` Joerg Sommrey 0 siblings, 1 reply; 9+ messages in thread From: Miklos Szeredi @ 2006-08-22 16:07 UTC (permalink / raw) To: jo; +Cc: linux-kernel > Tested both gphoto2 and gtkam without any problems. There is no impact > on the serial lines. > > NB: The *real* trouble I have is with ntpd and a reference clock > attached to /dev/ttyS1. ntpd enters a busy loop reading ttyS1, stops > working and eats up 100% CPU. > > Thanks for your investigations. Any other idea? Try 'killall -9 gphotofs' and then the 'fusermount -u'. Does that have the same effect? If so, after which does the serial line die? Miklos ^ permalink raw reply [flat|nested] 9+ messages in thread
* Re: PROBLEM: FUSE unmount breaks serial terminal line 2006-08-22 16:07 ` Miklos Szeredi @ 2006-08-22 17:43 ` Joerg Sommrey 2006-08-22 17:54 ` Russell King 0 siblings, 1 reply; 9+ messages in thread From: Joerg Sommrey @ 2006-08-22 17:43 UTC (permalink / raw) To: Miklos Szeredi; +Cc: linux-kernel On Tue, Aug 22, 2006 at 06:07:24PM +0200, Miklos Szeredi wrote: > > Tested both gphoto2 and gtkam without any problems. There is no impact > > on the serial lines. > > > > NB: The *real* trouble I have is with ntpd and a reference clock > > attached to /dev/ttyS1. ntpd enters a busy loop reading ttyS1, stops > > working and eats up 100% CPU. > > > > Thanks for your investigations. Any other idea? > > Try 'killall -9 gphotofs' and then the 'fusermount -u'. > > Does that have the same effect? If so, after which does the serial > line die? Here are the results and another insight: only the first serial device open for reading is affected. I.e. if ttyS0 is open for reading, ttyS1 doesn't break. If ttyS0 is not open, then ttyS1 breaks. This happens when gphotofs gets killed (or with fusermount -u without killing). -jo -- -rw-r--r-- 1 jo users 62 2006-08-22 19:05 /home/jo/.signature ^ permalink raw reply [flat|nested] 9+ messages in thread
* Re: PROBLEM: FUSE unmount breaks serial terminal line 2006-08-22 17:43 ` Joerg Sommrey @ 2006-08-22 17:54 ` Russell King 2006-08-22 18:24 ` Joerg Sommrey 0 siblings, 1 reply; 9+ messages in thread From: Russell King @ 2006-08-22 17:54 UTC (permalink / raw) To: Joerg Sommrey, Miklos Szeredi, linux-kernel On Tue, Aug 22, 2006 at 07:43:29PM +0200, Joerg Sommrey wrote: > On Tue, Aug 22, 2006 at 06:07:24PM +0200, Miklos Szeredi wrote: > > > Tested both gphoto2 and gtkam without any problems. There is no impact > > > on the serial lines. > > > > > > NB: The *real* trouble I have is with ntpd and a reference clock > > > attached to /dev/ttyS1. ntpd enters a busy loop reading ttyS1, stops > > > working and eats up 100% CPU. > > > > > > Thanks for your investigations. Any other idea? > > > > Try 'killall -9 gphotofs' and then the 'fusermount -u'. > > > > Does that have the same effect? If so, after which does the serial > > line die? > > Here are the results and another insight: only the first serial device > open for reading is affected. I.e. if ttyS0 is open for reading, > ttyS1 doesn't break. If ttyS0 is not open, then ttyS1 breaks. This > happens when gphotofs gets killed (or with fusermount -u without > killing). Have you checked to see what files gphotofs has open? (Check in /proc/<pid>/fd/). -- Russell King Linux kernel 2.6 ARM Linux - http://www.arm.linux.org.uk/ maintainer of: 2.6 Serial core ^ permalink raw reply [flat|nested] 9+ messages in thread
* Re: PROBLEM: FUSE unmount breaks serial terminal line 2006-08-22 17:54 ` Russell King @ 2006-08-22 18:24 ` Joerg Sommrey 0 siblings, 0 replies; 9+ messages in thread From: Joerg Sommrey @ 2006-08-22 18:24 UTC (permalink / raw) To: Russell King; +Cc: linux-kernel On Tue, Aug 22, 2006 at 06:54:11PM +0100, Russell King wrote: > On Tue, Aug 22, 2006 at 07:43:29PM +0200, Joerg Sommrey wrote: > > On Tue, Aug 22, 2006 at 06:07:24PM +0200, Miklos Szeredi wrote: > > > > Tested both gphoto2 and gtkam without any problems. There is no impact > > > > on the serial lines. > > > > > > > > NB: The *real* trouble I have is with ntpd and a reference clock > > > > attached to /dev/ttyS1. ntpd enters a busy loop reading ttyS1, stops > > > > working and eats up 100% CPU. > > > > > > > > Thanks for your investigations. Any other idea? > > > > > > Try 'killall -9 gphotofs' and then the 'fusermount -u'. > > > > > > Does that have the same effect? If so, after which does the serial > > > line die? > > > > Here are the results and another insight: only the first serial device > > open for reading is affected. I.e. if ttyS0 is open for reading, > > ttyS1 doesn't break. If ttyS0 is not open, then ttyS1 breaks. This > > happens when gphotofs gets killed (or with fusermount -u without > > killing). > > Have you checked to see what files gphotofs has open? (Check in > /proc/<pid>/fd/). > Sure I did check this. No ttyS? there. Thanks anyway! -jo -- -rw-r--r-- 1 jo users 62 2006-08-22 19:05 /home/jo/.signature ^ permalink raw reply [flat|nested] 9+ messages in thread
end of thread, other threads:[~2006-08-22 18:24 UTC | newest] Thread overview: 9+ messages (download: mbox.gz follow: Atom feed -- links below jump to the message on this page -- 2006-08-20 18:05 PROBLEM: FUSE unmount breaks serial terminal line Joerg Sommrey 2006-08-20 20:57 ` Miklos Szeredi 2006-08-20 21:28 ` Joerg Sommrey 2006-08-22 8:57 ` Miklos Szeredi 2006-08-22 15:59 ` Joerg Sommrey 2006-08-22 16:07 ` Miklos Szeredi 2006-08-22 17:43 ` Joerg Sommrey 2006-08-22 17:54 ` Russell King 2006-08-22 18:24 ` Joerg Sommrey
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