Date: Sun, 28 Jan 2018 14:28:31 -0700 From: Warner Losh <imp@bsdimp.com> To: thomas masper <thomas.masper@gmail.com> Cc: FreeBSD Current <current@freebsd.org> Subject: Re: Panic on shutdown @r328436: "Unholding 6 with cnt = -559038242" Message-ID: <CANCZdfqBadFix2yq_P8xsQXC0Xh=559prr2%2Br0t7XXhNkaBQig@mail.gmail.com> In-Reply-To: <CAFZo-6zgQbhOk_=SVeEghnKCdidb8m9oq15LncYunqwCVWkd3w@mail.gmail.com> References: <20180126122947.GA1287@albert.catwhisker.org> <CANCZdfqWs_1Ss_oJ0ik8r17uDRyUN8nk%2Bt9DS=zZ=j92Xz=qZA@mail.gmail.com> <20180126150710.GV1287@albert.catwhisker.org> <CAFZo-6zgQbhOk_=SVeEghnKCdidb8m9oq15LncYunqwCVWkd3w@mail.gmail.com>
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On Sun, Jan 28, 2018 at 2:22 PM, thomas masper <thomas.masper@gmail.com> wrote: > Hi, > similar panic happen to me when extracting a pendrive from laptop USB por= t > (I tried 3 different pendrive). > No issue if I reboot or shutdown. I don't know if those two issues are > related. > Do you have a reproducible test case? Ideally, it would be 'insert and remove usb thumb drive' but maybe there's more steps between insert and removal. Warner > panic: Releasing 6 with cnt =3D -559038242 > > GNU gdb (GDB) 8.0.1 [GDB v8.0.1 for FreeBSD] > Copyright (C) 2017 Free Software Foundation, Inc. > License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl. > html > > > This is free software: you are free to change and redistribute it. > There is NO WARRANTY, to the extent permitted by law. Type "show copying= " > and "show warranty" for details. > This GDB was configured as "x86_64-portbld-freebsd12.0". > Type "show configuration" for configuration details. > For bug reporting instructions, please see: > <http://www.gnu.org/software/gdb/bugs/>. > Find the GDB manual and other documentation resources online at: > <http://www.gnu.org/software/gdb/documentation/>. > For help, type "help". > Type "apropos word" to search for commands related to "word"... > Reading symbols from /boot/kernel/kernel...Reading symbols from > /usr/lib/debug//boot/kernel/kernel.debug...done. > done. > > Unread portion of the kernel message buffer: > da0 at umass-sim0 bus 0 scbus4 target 0 lun 0 > da0: <Generic Flash Disk 8.07> s/n 30E47C20 detached > (da0:umass-sim0:0:0:0): Periph destroyed > panic: Releasing 6 with cnt =3D -559038242 > cpuid =3D 0 > time =3D 1517158352 > KDB: stack backtrace: > db_trace_self_wrapper() at db_trace_self_wrapper+0x2b/frame > 0xfffffe00593838c0 > vpanic() at vpanic+0x18d/frame 0xfffffe0059383920 > panic() at panic+0x43/frame 0xfffffe0059383980 > dadiskgonecb() at dadiskgonecb+0x42/frame 0xfffffe00593839a0 > g_disk_providergone() at g_disk_providergone+0x25/frame 0xfffffe00593839d= 0 > g_destroy_provider() at g_destroy_provider+0xae/frame 0xfffffe00593839f0 > g_wither_washer() at g_wither_washer+0x87/frame 0xfffffe0059383a30 > g_run_events() at g_run_events+0x3ca/frame 0xfffffe0059383a70 > fork_exit() at fork_exit+0x84/frame 0xfffffe0059383ab0 > fork_trampoline() at fork_trampoline+0xe/frame 0xfffffe0059383ab0 > --- trap 0, rip =3D 0, rsp =3D 0, rbp =3D 0 --- > KDB: enter: panic > > __curthread () at ./machine/pcpu.h:229 > 229 __asm("movq %%gs:%1,%0" : "=3Dr" (td) > (kgdb) #0 __curthread () at ./machine/pcpu.h:229 > #1 doadump (textdump=3D0) at /usr/src/sys/kern/kern_shutdown.c:346 > #2 0xffffffff8040a08b in db_dump (dummy=3D<optimized out>, > dummy2=3D<unavailable>, dummy3=3D<unavailable>, dummy4=3D<unavailable= >) > at /usr/src/sys/ddb/db_command.c:574 > #3 0xffffffff80409e59 in db_command (last_cmdp=3D<optimized out>, > cmd_table=3D<optimized out>, dopager=3D<optimized out>) > at /usr/src/sys/ddb/db_command.c:481 > #4 0xffffffff80409bd4 in db_command_loop () > at /usr/src/sys/ddb/db_command.c:534 > #5 0xffffffff8040cdff in db_trap (type=3D<optimized out>, code=3D<optimi= zed > out>) > at /usr/src/sys/ddb/db_main.c:250 > #6 0xffffffff80b0d923 in kdb_trap (type=3D3, code=3D-61456, tf=3D<optimi= zed > out>) > at /usr/src/sys/kern/subr_kdb.c:697 > #7 0xffffffff80f7b498 in trap (frame=3D0xfffffe00593837f0) > at /usr/src/sys/amd64/amd64/trap.c:547 > #8 <signal handler called> > #9 kdb_enter (why=3D0xffffffff811f101e "panic", msg=3D<optimized out>) > at /usr/src/sys/kern/subr_kdb.c:479 > #10 0xffffffff80ac8d3a in vpanic (fmt=3D<optimized out>, > ap=3D0xfffffe0059383960) > at /usr/src/sys/kern/kern_shutdown.c:800 > #11 0xffffffff80ac8dc3 in panic ( > fmt=3D0xffffffff81b1bbd8 <cnputs_mtx> "\257\257\033\201\377\377\377\ > 377") > at /usr/src/sys/kern/kern_shutdown.c:738 > #12 0xffffffff80368bb2 in da_periph_release (periph=3D<optimized out>, > token=3DDA_REF_GEOM) at /usr/src/sys/cam/scsi/scsi_da.c:1591 > #13 dadiskgonecb (dp=3D<optimized out>) at > /usr/src/sys/cam/scsi/scsi_da.c:1904 > #14 0xffffffff80a0fdd5 in g_disk_providergone (pp=3D0xfffff80003e8b700) > at /usr/src/sys/geom/geom_disk.c:783 > #15 0xffffffff80a15f9e in g_destroy_provider (pp=3D0xfffff80003e8b700) > at /usr/src/sys/geom/geom_subr.c:746 > #16 0xffffffff80a15e17 in g_wither_washer () > at /usr/src/sys/geom/geom_subr.c:461 > #17 0xffffffff80a112da in g_run_events () > at /usr/src/sys/geom/geom_event.c:297 > #18 0xffffffff80a89444 in fork_exit ( > callout=3D0xffffffff80a138c0 <g_event_procbody>, arg=3D0x0, > frame=3D0xfffffe0059383ac0) at /usr/src/sys/kern/kern_fork.c:1039 > #19 <signal handler called> > (kgdb) > > > uname -a > FreeBSD laptopW530.tommyBSD.org 12.0-CURRENT FreeBSD 12.0-CURRENT #13 > r328509M: Sun Jan 28 15:38:35 CET 2018 > tommy@laptopW530.tommyBSD.org:/usr/obj/usr/src/amd64.amd64/sys/GENERIC > amd64 > > Regards, > thomas > > > On Fri, Jan 26, 2018 at 4:07 PM, David Wolfskill <david@catwhisker.org> > wrote: > > > On Fri, Jan 26, 2018 at 07:47:48AM -0700, Warner Losh wrote: > > > On Fri, Jan 26, 2018 at 5:29 AM, David Wolfskill <david@catwhisker.or= g > > > > > wrote: > > > > > > > This is on my "build machine" (laptop is still building updated por= ts > > > > for today, so I don't know yet whether or not it encounters this.) > > > > > > > > > > Running a kernel with INVARIANTS, right? > > > > Yes -- GENERIC. > > > > > > I had performed a source-based update from r328393 to r328436, > > > > rebooted, performed "make delete-old-libs", and all seemed well. > > > > > > > > > > This has my change 328415 in it. > > > > :-) > > > > > > I then issued "sudo shutdown -p now", and serial console shows: > > > > panic: Unholding 6 with cnt =3D -559038242 > > > > cpuid =3D 3 > > > > time =3D 1516968697 > > > > KDB: stack backtrace: > > > > db_trace_self_wrapper() at db_trace_self_wrapper+0x2b/frame > > > > 0xfffffe00004288c0 > > > > vpanic() at vpanic+0x18d/frame 0xfffffe0000428920 > > > > panic() at panic+0x43/frame 0xfffffe0000428980 > > > > dadiskgonecb() at dadiskgonecb+0x42/frame 0xfffffe00004289a0 > > > > g_disk_providergone() at g_disk_providergone+0x25/frame > > 0xfffffe00004289d0 > > > > g_destroy_provider() at g_destroy_provider+0xae/frame > > 0xfffffe00004289f0 > > > > g_wither_washer() at g_wither_washer+0x87/frame 0xfffffe0000428a30 > > > > g_run_events() at g_run_events+0x3ca/frame 0xfffffe0000428a70 > > > > fork_exit() at fork_exit+0x84/frame 0xfffffe0000428ab0 > > > > fork_trampoline() at fork_trampoline+0xe/frame 0xfffffe0000428ab0 > > > > --- trap 0, rip =3D 0, rsp =3D 0, rbp =3D 0 --- > > > > KDB: enter: panic > > > > [ thread pid 13 tid 100044 ] > > > > Stopped at kdb_enter+0x3b: movq $0,kdb_why > > > > db> > > > > > > > > > > That's no good. We're releasing a reference to the da peripheral > because > > > geom has finished with the disk and is giving us a final callback so = we > > can > > > drop the reference we took when we created the geom. Trouble is, cnt > > should > > > be like 1 always for this code, but it's not. It looks like it may be > > bytes > > > to a pointer :( > > > > > > > > > > As noted, this is a build machine, and it was to be powered off for > > > > the rest of the day anyway, so I don't need to get it up & running > > > > immediately: I can poke at the ddb prompt, given some clues. > > > > > > > > > > I don't suppose you can attach kgdb to this machine? I'd be intereste= d > to > > > see what the contents of the softc are...a > > > > Pointer to how to do that? > > > > I do have ddb right now.... > > > > > .... > > > Thanks for the report. This is quite troubling. > > > > Well, let's get it fixed, then! :-) > > > > > Warner > > > .... > > > > I should still have access to the serial console after I get in to the > > office (heading out shortly). > > > > Peace, > > david > > -- > > David H. Wolfskill david@catwhisker.org > > "unfortunately, no trust!=E2=80=9D -- well, of course! You reap what y= ou sow. > > > > See http://www.catwhisker.org/~david/publickey.gpg for my public key. > > > _______________________________________________ > freebsd-current@freebsd.org mailing list > https://lists.freebsd.org/mailman/listinfo/freebsd-current > To unsubscribe, send any mail to "freebsd-current-unsubscribe@freebsd.org= " >
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