All of this testing was done on an amd64 host.
* With a 2.6.15-rc1 (+ 17-11-2005 patches from UML site) in skas0 mode:
Runs quite well, but when running some long compilation (php, gcc or
xorg for example) it ends up crashing (this not new to this version - I
believe this bug has been present for a long time, just never diagnosed
- but this is 100% reproducible):
During boot the kernel prints out a lot of:
"load_TLS(O_FORCE) in fork_handler returned -2"
Then for example, try:
emerge -a php
(...)
/bin/sh ../../libtool --mode=compile g++ -DHAVE_CONFIG_H -I. -I.
-I../../autocfg -O2 -march=athlon-xp -fomit-frame-pointer -c -o
arena.lo `test -f 'arena.cpp' || echo './'`arena.cpp
mkdir .libs
g++ -DHAVE_CONFIG_H -I. -I. -I../../autocfg -O2 -march=athlon-xp
-fomit-frame-pointer -c arena.cpp -MT arena.lo -MD -MP
-MF .deps/arena.TPlo -fPIC -DPIC -o .libs/arena.lo
[42951313.910000] Kernel panic - not syncing: Kernel mode signal 7
* Same kernel but in TT mode does not boot:
(...)
[42949377.540000] VFS: Mounted root (ext3 filesystem) readonly.
[42949377.560000] line_ioctl: tty0: ioctl KDSIGACCEPT called
[42949377.560000] os_set_fd_async : failed to set O_ASYNC and O_NONBLOCK
on fd # 6, errno = 9
[42949377.560000] register_winch_irq - failed to register IRQ
[42949377.560000] os_set_fd_async : failed to set O_ASYNC and O_NONBLOCK
on fd # 6, errno = 9
[42949377.560000] register_winch_irq - failed to register IRQ
INIT: [42949377.560000] os_set_fd_async : failed to set O_ASYNC and
O_NONBLOCK on fd # 6, errno = 9
[42949377.560000] register_winch_irq - failed to register IRQ
version 2.86 booting[42949377.560000] os_set_fd_async : failed to set
O_ASYNC and O_NONBLOCK on fd # 6, errno = 9
[42949377.560000] register_winch_irq - failed to register IRQ
[42949377.580000] Kernel panic - not syncing: read of switch_pipe
failed, errno = 11
* Now, with 2.6.15-rc3 it does not boot:
either in TT mode:
Checking PROT_EXEC mmap in /tmp...OK
UML running in TT mode
tracing thread pid = 11250
Child 11253 exited with signal 7
(hangs there until I kill it)
* or in skas0 mode:
Checking PROT_EXEC mmap in /tmp...OK
Checking for the skas3 patch in the host:
- /proc/mm...not found
- PTRACE_FAULTINFO...not found
- PTRACE_LDT...not found
UML running in SKAS0 mode
(then it exits)
This is the same problem I had reported earlier, where it gets stuck -
strace extract follows:
sigaltstack({ss_sp=0x200000000, ss_flags=0,
ss_size=11529956872819846383}, NULL) = 0
rt_sigprocmask(SIG_SETMASK, [IO], NULL, 8) = 0
rt_sigprocmask(SIG_BLOCK, NULL, [IO], 8) = 0
rt_sigprocmask(SIG_BLOCK, [ALRM VTALRM IO], NULL, 8) = 0
getpid() = 11503
rt_sigprocmask(SIG_SETMASK, NULL, [ALRM VTALRM IO], 8) = 0
rt_sigprocmask(SIG_BLOCK, [ALRM VTALRM IO], NULL, 8) = 0
rt_sigprocmask(SIG_UNBLOCK, [], [ALRM VTALRM IO], 8) = 0
rt_sigprocmask(SIG_BLOCK, [ALRM VTALRM IO], NULL, 8) = 0
(repeat for a while - then)
--- SIGBUS (Bus error) @ 0 (0) ---
rt_sigprocmask(SIG_UNBLOCK, [USR1], [BUS USR1 ALRM VTALRM WINCH IO], 8)
= 0
rt_sigprocmask(SIG_UNBLOCK, [ALRM VTALRM IO], NULL, 8) = 0
rt_sigprocmask(SIG_SETMASK, NULL, [BUS WINCH], 8) = 0
rt_sigprocmask(SIG_BLOCK, [ALRM VTALRM IO], NULL, 8) = 0
rt_sigprocmask(SIG_UNBLOCK, [ALRM VTALRM IO], [BUS ALRM VTALRM WINCH
IO], 8) = 0
rt_sigprocmask(SIG_BLOCK, [], NULL, 8) = 0
(this repeats until)
rt_sigprocmask(SIG_BLOCK, [ALRM VTALRM IO], NULL, 8) = 0
rt_sigprocmask(SIG_UNBLOCK, [ALRM VTALRM IO], [BUS ALRM VTALRM WINCH
IO], 8) = 0
rt_sigprocmask(SIG_BLOCK, [], NULL, 8) = 0
open("/uml/.uml/3", O_RDONLY|O_NONBLOCK|O_LARGEFILE|O_DIRECTORY) = 4
fstat64(0x4, 0xa05735ac) = 0
fcntl64(4, F_SETFD, FD_CLOEXEC) = 0
getdents64(4, /* 3 entries */, 131072) = 72
unlink("/uml/.uml/3/pid") = 0
getdents64(4, /* 0 entries */, 131072) = 0
rmdir("/uml/.uml/3") = 0
getpid() = 11503
rt_sigprocmask(SIG_BLOCK, [ALRM VTALRM IO], NULL, 8) = 0
rt_sigprocmask(SIG_SETMASK, [IO], NULL, 8) = 0
rt_sigprocmask(SIG_BLOCK, [PROF], [IO], 8) = 0
setitimer(ITIMER_VIRTUAL, {it_interval={0, 0},
it_value={11530534155079122944, 27}}, NULL) = 0
setitimer(ITIMER_REAL, {it_interval={0, 0},
it_value={11530534155079122944, 27}}, NULL) = 0
rt_sigaction(SIGALRM, {SIG_IGN}, NULL, 8) = 0
rt_sigaction(SIGVTALRM, {SIG_IGN}, NULL, 8) = 0
rt_sigaction(SIGIO, {SIG_IGN}, NULL, 8) = 0
rt_sigprocmask(SIG_UNBLOCK, [ALRM VTALRM IO], NULL, 8) = 0
write(1, "\n", 1
) = 1
munmap(0x55556000, 4096) = 0
exit_group(1) = ?
Let me know what I can do to help.
Antoine
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