Date: Sat, 9 Feb 2008 23:33:17 +0300 From: Yar Tikhiy <yar@comp.chem.msu.su> To: Attilio Rao <attilio@freebsd.org> Cc: Kostik Belousov <kostikbel@gmail.com>, Scot Hetzel <swhetzel@gmail.com>, freebsd-current@freebsd.org, Doug Barton <dougb@freebsd.org> Subject: Re: panic: System call lstat returning with 1 locks held Message-ID: <20080209203317.GB62234@comp.chem.msu.su> In-Reply-To: <3bbf2fe10802060657h1dbc93e2lf3fd1b0c6843f674@mail.gmail.com> References: <790a9fff0801312241s346068b6s40fcae71ebbf546@mail.gmail.com> <20080201145051.GE79881@comp.chem.msu.su> <3bbf2fe10802011041t28e419c9n5f0f6f34d6450184@mail.gmail.com> <20080205162217.GA56373@comp.chem.msu.su> <3bbf2fe10802051156p1cc6ea67t7938a60e306323ce@mail.gmail.com> <20080206112930.GD7592@comp.chem.msu.su> <3bbf2fe10802060549u66b1067cy4bb9d4232ccef05d@mail.gmail.com> <20080206144802.GH7592@comp.chem.msu.su> <3bbf2fe10802060652y3782d023k9c5299168a81093d@mail.gmail.com> <3bbf2fe10802060657h1dbc93e2lf3fd1b0c6843f674@mail.gmail.com>
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On Wed, Feb 06, 2008 at 03:57:58PM +0100, Attilio Rao wrote: > 2008/2/6, Attilio Rao <attilio@freebsd.org>: > > 2008/2/6, Yar Tikhiy <yar@comp.chem.msu.su>: > > > > > On Wed, Feb 06, 2008 at 02:49:49PM +0100, Attilio Rao wrote: > > > [...] > > > > > > > Want to see if this bt has been helpful? :) > > > > Can you try the attached patch and see if kernel rings a bell?: > > > > http://www.freebsd.org/~attilio/ntfs_debug.diff > > > > > > > > > The kernel just panics. :-) > > > > > > This is the new I wanted to know! :) > > With better checks in lockmgr code, we would have caught more > > informations about it. > > > > Can you please now add DDB support and once it breaks in DDB do a > > 'show alllocks' and maybe other small investigations? > > This should shade a light for us. > > Could you please enable NTFS_DEBUG too and maybe see, when the kernel > panics, what is the value of i_usecount for the specified ip? > I want to exclude refcount leaking. i_usecount is just zero for the faulty ip: (kgdb) bt #0 doadump () at pcpu.h:195 #1 0xc07680de in boot (howto=260) at /usr/src/sys/kern/kern_shutdown.c:417 #2 0xc07683a3 in panic (fmt=Variable "fmt" is not available. ) at /usr/src/sys/kern/kern_shutdown.c:571 #3 0xc048e507 in db_panic (addr=Could not find the frame base for "db_panic". ) at /usr/src/sys/ddb/db_command.c:444 #4 0xc048ef0c in db_command (last_cmdp=0xc0bdd194, cmd_table=0x0, dopager=1) at /usr/src/sys/ddb/db_command.c:411 #5 0xc048f01a in db_command_loop () at /usr/src/sys/ddb/db_command.c:464 #6 0xc04907bd in db_trap (type=3, code=0) at /usr/src/sys/ddb/db_main.c:228 #7 0xc07913b6 in kdb_trap (type=3, code=0, tf=0xd614e9fc) at /usr/src/sys/kern/subr_kdb.c:510 #8 0xc0a5dedb in trap (frame=0xd614e9fc) at /usr/src/sys/i386/i386/trap.c:647 #9 0xc0a438cb in calltrap () at /usr/src/sys/i386/i386/exception.s:146 #10 0xc079153a in kdb_enter (why=0xc0af0f54 "panic", msg=0xc0af0f54 "panic") at cpufunc.h:60 #11 0xc076838c in panic (fmt=0xc0aee673 "lockmgr still held") at /usr/src/sys/kern/kern_shutdown.c:555 #12 0xc0755abe in lockdestroy (lkp=0xc0af0f54) at /usr/src/sys/kern/kern_lock.c:574 #13 0xc2ff8688 in ntfs_ntput (ip=0xc2fbba00) at /usr/src/sys/modules/ntfs/../../fs/ntfs/ntfs_subr.c:467 #14 0xc2ff5eb8 in ntfs_reclaim (ap=0xd614eb04) at /usr/src/sys/modules/ntfs/../../fs/ntfs/ntfs_vnops.c:262 [...] (kgdb) frame 13 #13 0xc2ff8688 in ntfs_ntput (ip=0xc2fbba00) at /usr/src/sys/modules/ntfs/../../fs/ntfs/ntfs_subr.c:467 467 lockdestroy(&ip->i_lock); (kgdb) p *ip $2 = {i_devvp = 0xc2fe2dd0, i_dev = 0xc2e7de00, i_hash = {le_next = 0x0, le_prev = 0xc302002c}, i_next = 0x0, i_prev = 0x0, i_mp = 0xc2fbb500, i_number = 10, i_flag = 32768, i_lock = {lk_object = { lo_name = 0xc2ffb672 "ntnode", lo_type = 0xc2ffb672 "ntnode", lo_flags = 91947008, lo_witness_data = {lod_list = { stqe_next = 0xc0c21190}, lod_witness = 0xc0c21190}}, lk_interlock = 0xc0c0dbe8, lk_flags = 262144, lk_sharecount = 0, lk_waitcount = 0, lk_exclusivecount = 1, lk_prio = 72, lk_timo = 0, lk_lockholder = 0xc2fecaa0, lk_newlock = 0x0}, i_interlock = { lock_object = {lo_name = 0xc2ffc039 "ntnode interlock", lo_type = 0xc2ffc039 "ntnode interlock", lo_flags = 16908288, lo_witness_data = {lod_list = {stqe_next = 0xc0c21168}, lod_witness = 0xc0c21168}}, mtx_lock = 6, mtx_recurse = 0}, i_usecount = 0, i_fnlist = {lh_first = 0x0}, i_valist = {lh_first = 0x0}, i_nlink = 1, i_mainrec = 0, i_frflag = 1} -- Yar
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