Date: Fri, 10 Jul 2009 13:58:49 +1000 From: John Marshall <john.marshall@riverwillow.com.au> To: freebsd-current@freebsd.org Subject: Re: Process stuck in vmmaps on 8.0-BETA1 Message-ID: <20090710035849.GB31950@rwpc12.mby.riverwillow.net.au> In-Reply-To: <20090709142121.GS55190@deviant.kiev.zoral.com.ua> References: <20090709060556.GA27373@rwpc12.mby.riverwillow.net.au> <a31046fc0907082342g1343b138g2fc38fda890b582a@mail.gmail.com> <20090709073054.GB27373@rwpc12.mby.riverwillow.net.au> <20090709085242.GC27373@rwpc12.mby.riverwillow.net.au> <20090709142121.GS55190@deviant.kiev.zoral.com.ua>
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--EuxKj2iCbKjpUGkD Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Thu, 09 Jul 2009, 17:21 +0300, Kostik Belousov wrote: > On Thu, Jul 09, 2009 at 06:52:42PM +1000, John Marshall wrote: > > OK, now that I've rebuilt the kernel with the debugging options not > > commented out, I'm getting a number of 'lock order reversal' messages > > printed on the console: is that normal? > >=20 > > From the Debugging Deadlocks chapter to which I was referred by pluknet > > (above) it appears that I need to enter 'sysctl debug.kdb.enter=3D1' or > > 'sysctl debug.kdb.panic=3D1' after I get the process into the desired > > 'stuck' state. If I enter either of those commands, the system reboots. > > Now *I'm* stuck. >=20 > Since you have mostly working system, and interesting information most > easy accessible by kgdb, attach it to the live kernel: > kgdb <path to kernel.debug> /dev/mem >=20 > From there, switch to the stuck process, > process <pid> I tried that... (kgdb) process 1373 Undefined command: "process". Try "help". It took me several more hours to discover "proc" which I assume is what you meant? > do > bt > find the frame for vm_map_delete, and print the entry: > p entry I have no idea which number(s) to plug in here. I hope I guessed the right one. > Also, I need to see the information you posted earlier, namely, procstat > -k and -v output for the process. rwsrv05# procstat 1373 PID PPID PGID SID TSID THR LOGIN WCHAN EMUL COMM = =20 1373 1 1373 1373 0 1 john vmmaps FreeBSD ELF32 ntpd = =20 rwsrv05# procstat -k 1373 PID TID COMM TDNAME KSTACK = =20 1373 100168 ntpd - mi_switch sleepq_switch slee= pq_wait _sleep vm_map_unlock_and_wait vm_map_delete vm_map_fixed vm_mmap mm= ap syscall Xint0x80_syscall=20 rwsrv05# procstat -v 1373 PID START END PRT RES PRES REF SHD FL TP PATH 1373 0x8048000 0x807e000 r-x 54 60 2 1 CN vn /usr/local/bin/ntpd 1373 0x807e000 0x8080000 rw- 2 0 1 0 C- vn /usr/local/bin/ntpd 1373 0x8080000 0x8100000 rw- 128 0 1 0 C- df=20 1373 0x2807e000 0x280ab000 r-x 45 0 143 62 CN vn /libexec/ld-elf.so.1 1373 0x280ab000 0x280ad000 rw- 2 0 1 0 C- vn /libexec/ld-elf.so.1 1373 0x280ad000 0x280c0000 rw- 19 0 1 0 C- df=20 1373 0x280c0000 0x280d7000 r-x 23 0 1 0 CN vn /lib/libm.so.5 1373 0x280d7000 0x280d8000 r-x 1 0 1 0 CN vn /lib/libm.so.5 1373 0x280d8000 0x280d9000 rw- 1 0 1 0 C- vn /lib/libm.so.5 1373 0x280d9000 0x28211000 r-x 312 0 1 0 CN vn /lib/libcrypto.so.5 1373 0x28211000 0x28212000 r-x 1 0 1 0 CN vn /lib/libcrypto.so.5 1373 0x28212000 0x2822a000 rw- 24 0 1 0 C- vn /lib/libcrypto.so.5 1373 0x2822a000 0x2822c000 rw- 2 0 1 0 C- df=20 1373 0x2822c000 0x28232000 r-x 6 0 1 0 CN vn /lib/libkvm.so.4 1373 0x28232000 0x28233000 r-x 1 0 1 0 CN vn /lib/libkvm.so.4 1373 0x28233000 0x28234000 rw- 1 0 1 0 C- vn /lib/libkvm.so.4 1373 0x28234000 0x2824c000 r-x 24 0 1 0 CN vn /usr/lib/libelf.so.1 1373 0x2824c000 0x2824d000 r-x 1 0 1 0 CN vn /usr/lib/libelf.so.1 1373 0x2824d000 0x2824e000 rw- 1 0 1 0 C- vn /usr/lib/libelf.so.1 1373 0x2824e000 0x28251000 r-x 3 0 15 10 CN vn /usr/lib/librt.so.1 1373 0x28251000 0x28252000 r-x 1 0 1 0 CN vn /usr/lib/librt.so.1 1373 0x28252000 0x28253000 rw- 1 0 1 0 C- vn /usr/lib/librt.so.1 1373 0x28253000 0x28260000 r-x 13 0 1 0 CN vn /lib/libmd.so.4 1373 0x28260000 0x28261000 r-x 1 0 1 0 CN vn /lib/libmd.so.4 1373 0x28261000 0x28262000 rw- 1 0 1 0 C- vn /lib/libmd.so.4 1373 0x28262000 0x28351000 r-x 239 0 1 0 CN vn /lib/libc.so.7 1373 0x28351000 0x28352000 r-x 1 0 1 0 CN vn /lib/libc.so.7 1373 0x28352000 0x28358000 rw- 6 0 1 0 C- vn /lib/libc.so.7 1373 0x28358000 0x2836e000 rw- 22 0 1 0 C- df=20 1373 0x2836e000 0x2837a000 --- 0 0 0 0 -- --=20 1373 0x28400000 0x28500000 rw- 256 0 1 0 C- df=20 1373 0xbfbe0000 0xbfc00000 rwx 32 0 1 0 C- df=20 rwsrv05# kgdb /spare/obj8/usr/src/sys/RWSRV05/kernel.debug /dev/mem GNU gdb 6.1.1 [FreeBSD] Copyright 2004 Free Software Foundation, Inc. GDB is free software, covered by the GNU General Public License, and you are welcome to change it and/or distribute copies of it under certain condition= s. Type "show copying" to see the conditions. There is absolutely no warranty for GDB. Type "show warranty" for details. This GDB was configured as "i386-marcel-freebsd"... #0 sched_switch (td=3D0xc08ad090, newtd=3D0xc4d4d900, flags=3D260) at /usr/src/sys/kern/sched_ule.c:1864 1864 cpuid =3D PCPU_GET(cpuid); Ready to go. Enter 'tr' to connect to the remote target with /dev/cuad0, 'tr /dev/cuad1' to connect to a different port or 'trf portno' to connect to the remote target with the firewire interface. portno defaults to 5556. Type 'getsyms' after connection to load kld symbols. If you're debugging a local system, you can use 'kldsyms' instead to load the kld symbols. That's a less obnoxious interface. (kgdb) proc 1373 [Switching to thread 154 (Thread 100168)]#0 sched_switch (td=3D0xc5776240,= newtd=3D0xc4d4db40, flags=3D0x104) at /usr/src/sys/kern/sched_ule.c:1864 1864 cpuid =3D PCPU_GET(cpuid); (kgdb) bt 1373 #0 sched_switch (td=3D0xc5776240, newtd=3D0xc4d4db40, flags=3D0x104) at /u= sr/src/sys/kern/sched_ule.c:1864 During symbol reading, Incomplete CFI data; unspecified registers at 0xc05f= e876. #1 0xc05e572f in mi_switch (flags=3D0x104, newtd=3D0x0) at /usr/src/sys/ke= rn/kern_synch.c:444 #2 0xc06147fc in sleepq_switch (wchan=3D0xc5a5f338, pri=3D0x44) at /usr/sr= c/sys/kern/subr_sleepqueue.c:505 #3 0xc0615495 in sleepq_wait (wchan=3D0xc5a5f338, pri=3D0x44) at /usr/src/= sys/kern/subr_sleepqueue.c:584 #4 0xc05e5bd9 in _sleep (ident=3D0xc5a5f338, lock=3D0xc0a243a4, priority= =3D0x244, wmesg=3D0xc08357af "vmmaps", timo=3D0x0) at /usr/src/sys/kern/kern_synch.c:232 #5 0xc075f8d7 in vm_map_unlock_and_wait (map=3D0xc5a5f2b8, timo=3D0x0) at = /usr/src/sys/vm/vm_map.c:638 #6 0xc075f987 in vm_map_delete (map=3D0xc5a5f2b8, start=3D0x2836e000, end= =3D0x28374000) at /usr/src/sys/vm/vm_map.c:2703 #7 0xc076136e in vm_map_fixed (map=3D0xc5a5f2b8, object=3D0xc52ffc38, offs= et=3D0x0, start=3D0x2836e000, length=3D0x6000,=20 prot=3D0x5, max=3D0x7, cow=3D0x112) at /usr/src/sys/vm/vm_map.c:1367 #8 0xc0763a48 in vm_mmap (map=3D0xc5a5f2b8, addr=3D0xe7840c70, size=3D0x60= 00, prot=3DVariable "prot" is not available. ) at /usr/src/sys/vm/vm_mmap.c:1439 #9 0xc07641ef in mmap (td=3D0xc5776240, uap=3D0xe7840cf8) at /usr/src/sys/= vm/vm_mmap.c:390 #10 0xc07b955f in syscall (frame=3D0xe7840d38) at /usr/src/sys/i386/i386/tr= ap.c:1073 #11 0xc079dff0 in Xint0x80_syscall () at /usr/src/sys/i386/i386/exception.s= :261 #12 0x00000033 in ?? () Previous frame inner to this frame (corrupt stack?) (kgdb) p *0xc5a5f2b8=20 $1 =3D 0xc58cb048 --=20 John Marshall --EuxKj2iCbKjpUGkD Content-Type: application/pgp-signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.11 (FreeBSD) iEYEARECAAYFAkpWvHkACgkQw/tAaKKahKK2JwCfbP3SRWwxeONNQR9zHoOEZZEq heYAn1G3sm8mQKJ0qvg2MhZoKmj/63DX =RBni -----END PGP SIGNATURE----- --EuxKj2iCbKjpUGkD--
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