Messages in this thread |  | | | From | Toralf Förster <> | | Subject | Re: kernel 2.6.39 (user mode linux) crashes (2.6.38 works fine) | | Date | Sat, 21 May 2011 10:53:59 +0200 |
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Toralf Förster wrote at 00:53:50 > Bisecting gave : > > > git bisect badd123375425d7df4b6081a631fc1203fceafa59b2 is the first bad > commit commit d123375425d7df4b6081a631fc1203fceafa59b2 > Author: Thomas Gleixner <tglx@linutronix.de> > Date: Wed Jan 26 21:32:01 2011 +0100 > > rwsem: Remove redundant asmregparm annotation > > Peter Zijlstra pointed out, that the only user of asmregparm (x86) is > compiling the kernel already with -mregparm=3. So the annotation of > the rwsem functions is redundant. Remove it.
BTW I double checked that this commit is the culprit of the hang - it is. Furthermore I added these kernel config options :
tfoerste@n22 ~/devel/linux-2.6 $ diff .config* | grep '<' | grep -v '#' < CONFIG_X86_CPU=y < CONFIG_CMPXCHG_LOCAL=y < CONFIG_IP_FIB_HASH=y < CONFIG_RPCSEC_GSS_KRB5=y < CONFIG_DEBUG_RT_MUTEXES=y < CONFIG_DEBUG_PI_LIST=y < CONFIG_DEBUG_MUTEXES=y < CONFIG_BKL=y < CONFIG_DEBUG_INFO=y < CONFIG_DEBUG_WRITECOUNT=y < CONFIG_DEBUG_LIST=y < CONFIG_DEBUG_PAGEALLOC=y < CONFIG_WANT_PAGE_DEBUG_FLAGS=y < CONFIG_PAGE_POISONING=y attached gdb to the top process of linx and run wiresahrk in parallel when I did $>firefox https://n22_uml/phpmyadmin/ &
GDB gave :
Program received signal SIGSEGV, Segmentation fault. 0x0829f2bd in rwsem_down_failed_common (sem=0x84f6000, flags=2, adjustment=65535) at lib/rwsem.c:189 189 adjustment += RWSEM_WAITING_BIAS; (gdb) bt full #0 0x0829f2bd in rwsem_down_failed_common (sem=0x84f6000, flags=2, adjustment=65535) at lib/rwsem.c:189 waiter = {list = {next = 0x0, prev = 0x6}, task = 0x1809d480, flags = 2} tsk = 0x1809d480 count = <value optimized out> #1 0x0829f375 in rwsem_down_write_failed (sem=0x84f6000) at lib/rwsem.c:236 No locals. #2 0x0829d0e2 in call_rwsem_down_write_failed () at arch/um/sys-i386/../../x86/lib/semaphore_32.S:97 No locals. #3 0x0829eaa7 in __down_write_nested (sem=0x182aa774) at /home/tfoerste/devel/linux-2.6/arch/x86/include/asm/rwsem.h:105 tmp = -1 #4 __down_write (sem=0x182aa774) at /home/tfoerste/devel/linux-2.6/arch/x86/include/asm/rwsem.h:121 No locals. #5 down_write (sem=0x182aa774) at kernel/rwsem.c:51 No locals. #6 0x080d2de3 in sys_brk (brk=139419648) at mm/mmap.c:254 rlim = <value optimized out> newbrk = <value optimized out> oldbrk = 0 mm = 0x182aa740 #7 0x08060d16 in handle_syscall (r=0x1809d650) at arch/um/kernel/skas/syscall.c:35 syscall = <value optimized out> #8 0x08074ca1 in handle_trap (regs=0x1809d650) at arch/um/os-Linux/skas/process.c:201 err = <value optimized out> status = 0 #9 userspace (regs=0x1809d650) at arch/um/os-Linux/skas/process.c:417 sig = <value optimized out> timer = {it_interval = {tv_sec = 0, tv_usec = 0}, it_value = {tv_sec = 0, tv_usec = 5999}} nsecs = <value optimized out> err = <value optimized out> status = 34175 op = 31 pid = 12820 local_using_sysemu = 2 #10 0x0805e0cb in fork_handler () at arch/um/kernel/process.c:181 No locals. #11 0xaaaaaaaa in ?? () No symbol table info available. (gdb) quit
I attached the wireshark stream onto this mail - the network connections at at packet #92:
TLSv1 754 [TCP Retransmission] Change Cipher Spec, Encrypted Handshake Message, Application Data
might give a hint, that in few cases the UML system even hangs during start of the sshd, isn't it ?
-- MfG/Sincerely Toralf Förster pgp finger print: 7B1A 07F4 EC82 0F90 D4C2 8936 872A E508 7DB6 9DA3 [unhandled content-type:application/octet-stream]
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