Well, I did an strace, and also a gdb backtrace of the problem at hand.
The strace fragment takes up right after login has succeeded ((visually
there's never any sign of a logged-in session -- the screen just blanks,
and Xorg restarts, it all happens very quickly).
At the end of this fragment notice that SIGPIPE is raised twice, on socket
fd's 25 and 26. I believe these are both /tmp/.X11-unix/X0.
The gdb backtrace reflects this as well, I think.
Now admittedly, this is taking me a bit far from the original problem,
getting ecryptfs to not auto-mount, and testing that by: umounting the
ecryptfs, removinf the file auto-mount, and then logging out and back into
the X server (not a reboot).
But the thing is, this dying of Xorg happens /only/ under exactly these
circumstances. Normally logging out and back in worked, and still works,
without any problem.
OK, here are the two traces:
strace:
(22932 = Xorg)
...
23246 13:03:23.308453 read(13, "\2"..., 1) = 1
23246 13:03:23.308508 read(13, "d"..., 1) = 1
23246 13:03:23.308556 read(13, "e"..., 1) = 1
23246 13:03:23.308603 read(13, "f"..., 1) = 1
23246 13:03:23.308650 read(13, "a"..., 1) = 1
23246 13:03:23.308698 read(13, "u"..., 1) = 1
23246 13:03:23.308746 read(13, "l"..., 1) = 1
23246 13:03:23.308793 read(13, "t"..., 1) = 1
23246 13:03:23.308840 read(13, "."..., 1) = 1
23246 13:03:23.308889 read(13, "d"..., 1) = 1
23246 13:03:23.308936 read(13, "e"..., 1) = 1
23246 13:03:23.308983 read(13, "s"..., 1) = 1
23246 13:03:23.309030 read(13, "k"..., 1) = 1
23246 13:03:23.309077 read(13, "t"..., 1) = 1
23246 13:03:23.309124 read(13, "o"..., 1) = 1
23246 13:03:23.309172 read(13, "p"..., 1) = 1
23246 13:03:23.309219 read(13, "\n"..., 1) = 1
23246 13:03:23.309270 gettimeofday({1256558603, 309287}, {4294967236, 0}) = 0
23246 13:03:23.309345 write(12, "\2&\n"..., 3) = 3
23246 13:03:23.309483 sched_yield() = 0
23246 13:03:23.309532 read(13, "\2"..., 1) = 1
23246 13:03:23.309585 read(13, "\n"..., 1) = 1
23246 13:03:23.309633 gettimeofday({1256558603, 309650}, {4294967236, 0}) = 0
23246 13:03:23.309695 write(12, "\2C\n"..., 3) = 3
23246 13:03:23.309782 sched_yield() = 0
23246 13:03:23.309829 read(13, "\2"..., 1) = 1
23246 13:03:23.309880 read(13, "\n"..., 1) = 1
23246 13:03:23.309929 gettimeofday({1256558603, 309946}, {4294967236, 0}) = 0
23246 13:03:23.309983 write(12, "\2R\n"..., 3) = 3
23246 13:03:23.310064 sched_yield() = 0
23246 13:03:23.310110 read(13, "\2"..., 1) = 1
23246 13:03:23.310162 read(13, "\n"..., 1) = 1
23246 13:03:23.310210 gettimeofday({1256558603, 310226}, {4294967236, 0}) = 0
23246 13:03:23.310277 rt_sigprocmask(SIG_BLOCK, [CHLD], [], 8) = 0
23246 13:03:23.310342 write(12, "\2P\n"..., 3) = 3
23246 13:03:23.310458 sched_yield() = 0
23246 13:03:23.310506 read(13, <unfinished ...>
22932 13:03:23.310532 <... select resumed> ) = 1 (in [25], left {97, 520820})
22932 13:03:23.310599 setitimer(ITIMER_REAL, {it_interval={0, 20000},
it_value={0, 20000}}, NULL) = 0
22932 13:03:23.310661 clock_gettime(CLOCK_MONOTONIC, {11883, 774747739}) = 0
22932 13:03:23.310718 read(25, "+\30\1\0"..., 4096) = 4
22932 13:03:23.310791 read(25, 0x8b58998, 4096) = -1 EAGAIN (Resource
temporarily unavailable)
22932 13:03:23.310847 writev(25,
[{"\1\0u\f\0\0\0\0\1\0\0\0\0\0\0\0\4\0\0\0a\0\0\0000D\257\10\0\0\0\0"..., 32}],
1 <unfinished ...>
23246 13:03:23.315077 <... read resumed> "\2"..., 1) = 1
23246 13:03:23.315199 read(13, "\n"..., 1) = 1
23246 13:03:23.315252 gettimeofday({1256558603, 315270}, {4294967236, 0}) = 0
23246 13:03:23.315318 rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
23246 13:03:23.315407 select(5, [4], NULL, NULL, NULL) = 1 (in [4])
23246 13:03:23.315470 read(4, "!"..., 1) = 1
23246 13:03:23.315521 select(5, [4], NULL, NULL, NULL <unfinished ...>
22932 13:03:23.315553 <... writev resumed> ) = 32
22932 13:03:23.315594 clock_gettime(CLOCK_MONOTONIC, {11883, 779682134}) = 0
22932 13:03:23.315652 setitimer(ITIMER_REAL, {it_interval={0, 0}, it_value={0,
0}}, NULL) = 0
22932 13:03:23.315726 select(256, [1 3 5 7 11 12 13 19 24 25 26], NULL, NULL,
{97, 516000}) = 2 (in [25 26], left {97, 515983})
22932 13:03:23.315840 setitimer(ITIMER_REAL, {it_interval={0, 20000},
it_value={0, 20000}}, NULL) = 0
22932 13:03:23.315898 clock_gettime(CLOCK_MONOTONIC, {11883, 779985014}) = 0
22932 13:03:23.315975 read(25,
"\2\30\4\0\3...@\0\1\0\0\0\0\0\0\0\2\4\4\0!\1@\0\1\0\0\0\0\0\0\0\n\0\2\0...@\0\2\2\4\0\30\1@\0\2\0\0\0\23\23\23\0\2\1\4\0...@\0\2"...,
4096) = 324
22932 13:03:23.316180 mmap2(NULL, 5246976, PROT_READ|PROT_WRITE,
MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0xb6119000
22932 13:03:23.335951 --- SIGALRM (Alarm clock) @ 0 (0) ---
22932 13:03:23.336089 sigreturn() = ? (mask now [])
22932 13:03:23.338420 setitimer(ITIMER_REAL, {it_interval={0, 0}, it_value={0,
0}}, NULL) = 0
22932 13:03:23.338547 select(256, [1 3 5 7 11 12 13 19 24 26], NULL, NULL, {0,
0}) = 1 (in [26], left {0, 0})
22932 13:03:23.338663 setitimer(ITIMER_REAL, {it_interval={0, 20000},
it_value={0, 20000}}, NULL) = 0
22932 13:03:23.338724 clock_gettime(CLOCK_MONOTONIC, {11883, 802812793}) = 0
22932 13:03:23.338806 munmap(0xb6119000, 5246976) = 0
22932 13:03:23.339839 read(25, ""..., 4096) = 0
22932 13:03:23.339913 writev(25,
[{"\22bx\f...@\0#\1@\0\0\0\0\0\310\310\267\277\332\37\t\10\354\310\267\277...@\0\f\37x\f!\1@\0\0\0\0\0\346\0\26\0\0\0\0\0\3249\37\10\0\0\0\0\0\0\0\0\22"...,
128}], 1) = -1 EPIPE (Broken pipe)
22932 13:03:23.340054 --- SIGPIPE (Broken pipe) @ 0 (0) ---
22932 13:03:23.340161 shutdown(25, 2 /* send and receive */) = 0
22932 13:03:23.340216 close(25) = 0
22932 13:03:23.340432 clock_gettime(CLOCK_MONOTONIC, {11883, 804533149}) = 0
22932 13:03:23.340586 shmdt(0xb60b9000) = 0
22932 13:03:23.340859 clock_gettime(CLOCK_MONOTONIC, {11883, 804958718}) = 0
22932 13:03:23.341034 writev(26,
[{"\21\310i\0\244\0\0\0\...@\0\270\32\256\10\260\32\256\10\364_\36\10\270\32\256\0107\0\0\0\22\34i\0\244\0\0\0\376\0@\0\0\0\0\0\30\310\267\277\30\320\f\267(#\257\0108\204\r\267\21"...,
96}], 1) = -1 EPIPE (Broken pipe)
22932 13:03:23.341199 --- SIGPIPE (Broken pipe) @ 0 (0) ---
22932 13:03:23.341300 shutdown(26, 2 /* send and receive */) = 0
22932 13:03:23.341356 close(26) = 0
22932 13:03:23.341422 clock_gettime(CLOCK_MONOTONIC, {11883, 805510707}) = 0
...
gdb:
...
(gdb) cont
Continuing.
Program received signal SIGUSR1, User defined signal 1.
[Switching to Thread 0xb78966d0 (LWP 6123)]
0xb7ef0430 in __kernel_vsyscall ()
(gdb) cont
Continuing.
Program received signal SIGPIPE, Broken pipe.
0xb7ef0430 in __kernel_vsyscall ()
(gdb) backtrace full
#0 0xb7ef0430 in __kernel_vsyscall ()
No symbol table info available.
#1 0xb7b871fc in writev () from /lib/tls/i686/cmov/libc.so.6
No symbol table info available.
#2 0x0813c29e in ?? ()
No symbol table info available.
#3 0x0813b2df in _XSERVTransWritev ()
No symbol table info available.
#4 0x08137282 in FlushClient ()
No symbol table info available.
#5 0x08135b17 in CloseDownConnection ()
No symbol table info available.
#6 0x080876ad in CloseDownClient ()
No symbol table info available.
#7 0x0808d418 in Dispatch ()
No symbol table info available.
#8 0x080722ed in main ()
No symbol table info available.
(gdb) quit
--
ecryptfs: disabling auto-mount diables gdm login
https://bugs.launchpad.net/bugs/460476
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