Date: Sun, 28 Jan 2018 20:40:22 -0500 From: Allan Jude <allanjude@freebsd.org> To: freebsd-current@freebsd.org Subject: Re: Panic on shutdown @r328436: "Unholding 6 with cnt = -559038242" Message-ID: <2effa324-c428-6135-371b-acb00c803d29@freebsd.org> In-Reply-To: <CANCZdfqBadFix2yq_P8xsQXC0Xh=559prr2%2Br0t7XXhNkaBQig@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> <CANCZdfqBadFix2yq_P8xsQXC0Xh=559prr2%2Br0t7XXhNkaBQig@mail.gmail.com>
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On 2018-01-28 16:28, Warner Losh wrote: > 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 port >> (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 = -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 = -559038242 >> cpuid = 0 >> time = 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 0xfffffe00593839d0 >> 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 = 0, rsp = 0, rbp = 0 --- >> KDB: enter: panic >> >> __curthread () at ./machine/pcpu.h:229 >> 229 __asm("movq %%gs:%1,%0" : "=r" (td) >> (kgdb) #0 __curthread () at ./machine/pcpu.h:229 >> #1 doadump (textdump=0) at /usr/src/sys/kern/kern_shutdown.c:346 >> #2 0xffffffff8040a08b in db_dump (dummy=<optimized out>, >> dummy2=<unavailable>, dummy3=<unavailable>, dummy4=<unavailable>) >> at /usr/src/sys/ddb/db_command.c:574 >> #3 0xffffffff80409e59 in db_command (last_cmdp=<optimized out>, >> cmd_table=<optimized out>, dopager=<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=<optimized out>, code=<optimized >> out>) >> at /usr/src/sys/ddb/db_main.c:250 >> #6 0xffffffff80b0d923 in kdb_trap (type=3, code=-61456, tf=<optimized >> out>) >> at /usr/src/sys/kern/subr_kdb.c:697 >> #7 0xffffffff80f7b498 in trap (frame=0xfffffe00593837f0) >> at /usr/src/sys/amd64/amd64/trap.c:547 >> #8 <signal handler called> >> #9 kdb_enter (why=0xffffffff811f101e "panic", msg=<optimized out>) >> at /usr/src/sys/kern/subr_kdb.c:479 >> #10 0xffffffff80ac8d3a in vpanic (fmt=<optimized out>, >> ap=0xfffffe0059383960) >> at /usr/src/sys/kern/kern_shutdown.c:800 >> #11 0xffffffff80ac8dc3 in panic ( >> fmt=0xffffffff81b1bbd8 <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=<optimized out>, >> token=DA_REF_GEOM) at /usr/src/sys/cam/scsi/scsi_da.c:1591 >> #13 dadiskgonecb (dp=<optimized out>) at >> /usr/src/sys/cam/scsi/scsi_da.c:1904 >> #14 0xffffffff80a0fdd5 in g_disk_providergone (pp=0xfffff80003e8b700) >> at /usr/src/sys/geom/geom_disk.c:783 >> #15 0xffffffff80a15f9e in g_destroy_provider (pp=0xfffff80003e8b700) >> 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=0xffffffff80a138c0 <g_event_procbody>, arg=0x0, >> frame=0xfffffe0059383ac0) 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.org >>> >>>> wrote: >>>> >>>>> This is on my "build machine" (laptop is still building updated ports >>>>> 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 = -559038242 >>>>> cpuid = 3 >>>>> time = 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 = 0, rsp = 0, rbp = 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 interested >> 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!” -- well, of course! You reap what you 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" >> > _______________________________________________ > 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" > I've been seeing this today while working on my laptop. 1) insert USB stick. 2) mount UFS partition to /mnt 3) copy a file off 4) umount /mnt 5) remove usb stick 6) instant panic Oddly, it is the same negative number every time (-559038242), so it isn't random/memory corruption. -- Allan Jude
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