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Re: kern/52569 (Entering ddb using USB keyboard panics with "locking against myself")

The following reply was made to PR kern/52569; it has been noted by GNATS.

From: Andreas Gustafsson <>
Subject: Re: kern/52569 (Entering ddb using USB keyboard panics with "locking against myself")
Date: Fri, 21 Sep 2018 15:30:17 +0300 wrote:
 > this should be fixed in -current now.  can you check?
 I was finally able to work around all of 53621, 41780, and 53599
 by adding "userconf=disable sb0" to /boot.cfg.
 Running the "while true; do ifconfig athn0 down; ifconfig athn0 up; done"
 loop from PR 52553 and hitting ctrl-alt-esc on the USB keyboard still
 causes a panic, but the panic message is now "mutex_owned(&sc->sc_lock)"
 rather than "locking against myself":
 test# gdb /netbsd
 GNU gdb (GDB) 7.12
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 License GPLv3+: GNU GPL version 3 or later <>
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 and "show warranty" for details.
 This GDB was configured as "i486--netbsdelf".
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 For bug reporting instructions, please see:
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 Type "apropos word" to search for commands related to "word"...
 Reading symbols from /netbsd...done.
 (gdb) target kvm netbsd.8.core
 0xc011b2b5 in cpu_reboot ()
 (gdb) bt
 #0  0xc011b2b5 in cpu_reboot ()
 #1  0xc0937140 in vpanic ()
 #2  0xc0d64c5f in kern_assert ()
 #3  0xc0596be6 in uhci_device_bulk_done ()
 #4  0xc039a357 in usb_transfer_complete ()
 #5  0xc059504c in uhci_softintr ()
 #6  0xc05976b1 in uhci_intr1 ()
 #7  0xc0597879 in uhci_poll ()
 #8  0xc03ae888 in ukbd_cngetc ()
 #9  0xc07a2377 in wskbd_cngetc ()
 #10 0xc0798f1f in wsdisplay_getc ()
 #11 0xc011dcf2 in cngetc ()
 #12 0xc06c51eb in db_readline ()
 #13 0xc06c5abf in db_read_line ()
 #14 0xc06c429e in db_command_loop ()
 #15 0xc06c7b2d in db_trap ()
 #16 0xc01172c6 in kdb_trap ()
 #17 0xc011cee3 in trap ()
 #18 0xc0114532 in alltraps ()
 #19 0xd85a0a70 in ?? ()
 #20 0xc07a2118 in wskbd_translate ()
 #21 0xc07a2549 in wskbd_input ()
 #22 0xc03aedfc in ukbd_decode ()
 #23 0xc091ae64 in callout_softclock ()
 #24 0xc090ea81 in softint_dispatch ()
 #25 0xc0100f2b in Xsoftintr ()
 #26 0xc1edcd20 in ?? ()
 Backtrace stopped: previous frame inner to this frame (corrupt stack?)
 test# crash -M netbsd.8.core
 Crash version 8.99.2, image version 8.99.25.
 WARNING: versions differ, you may not be able to examine this image.
 System panicked: kernel diagnostic assertion "mutex_owned(&sc->sc_lock)" failed: file "/tmp/bracket/build/2018.", line 3332 
 Backtrace from time of crash is available.
 crash> bt
 _KERNEL_OPT_NARCNET(8,104,c011b2b5,8,c10e5959,0,104,c10543a4,d85a0740,d85a0724) at 0
 __kernel_end(104,0,c10543a4,d85a0740,c214a4c8,c2045008,c204526c,d85a0734,c0d64c5f,c10543a4) at d85a0740
 vpanic(c10543a4,d85a0740,d85a0764,c0596be6,c10543a4,c10542e3,c1098caa,c10ce6ac,d04,40016b4) at vpanic+0x142
 __x86_indirect_thunk_edx(c10543a4,c10542e3,c1098caa,c10ce6ac,d04,40016b4,4,c2128d00,0,10) at __x86_indirect_thunk_edx
 uhci_device_bulk_done(c2128d00,c214a608,1,10,d85a07a4,c03992d4,c2128dd0,5a0002,1,c214a4c8) at uhci_device_bulk_done+0x262
 usb_transfer_complete(c2128d00,1710,10,a,20,d85a07df,73,0,10,3131205b) at usb_transfer_complete+0xce
 uhci_softintr(c204500c,2020,2,1,3,c2045008,c2045270,d85a0894,d85a0854,c0597879) at uhci_softintr+0x282
 uhci_intr1(c2045270,2020,2,20,3,c209e000,d85a0890,d85a087c,c03ae888,c204500c) at uhci_intr1+0x1d3
 uhci_poll(c204500c,2,d85a087c,c1629000,0,d85a0890,d85a0894,d85a09c4,d85a08a0,c07a2377) at uhci_poll+0x7f
 ukbd_cngetc(c209e000,d85a0890,d85a0894,122e,7020,8,6,d85a08b0,c0798f1f,2f00) at ukbd_cngetc+0x10b
 wskbd_cngetc(2f00,0,d85a08c8,c011dcf2,2f00,0,c13d8f80,c13d8f80,d85a08fc,c06c51eb) at wskbd_cngetc+0xae
 wsdisplay_getc(2f00,0,c13d8f80,c13d8f80,d85a08fc,c06c51eb,c10e57d7,0,0,0) at wsdisplay_getc+0x27
 cngetc(c10e57d7,0,0,0,0,7,2,0,0,6) at cngetc+0x40
 db_readline(c13d8f80,78,d85a0940,c06c429e,1,868847dd,0,0,0,d85a0910) at db_readline+0x4e
 db_read_line(1,868847dd,0,0,0,d85a0910,d85a0940,6,d85a09c4,c06c426c) at db_read_line+0x1a
 db_command_loop(c0115b64,0,5,c134c8c1,1,d85a0a70,d85a09d0,c01172c6,1,0) at db_command_loop+0x86
 db_trap(1,0,0,d85a097c,0,c0590010,c13c0030,10,c0590010,c213f1a6) at db_trap+0xe0
 kdb_trap(1,0,d85a0a70,5,d859e2c0,202,b6bb466d,6,d85a0af0,c1304580) at kdb_trap+0xd4
 trap() at trap+0x495
 --- trap (number 1) ---
 breakpoint(c201d188,0,0,c091af2a,c202bca8,c091b645,c1eb001b,c08f9087,c0921df2,c2155888) at breakpoint+0x4
 wskbd_translate(c2155888,1,c2398e00,d85a0b40,c0143fa9,8,200007,d85a0b4a,d85a0b4a,c209e000) at wskbd_translate+0xb12
 wskbd_input(c2155888,2,29,c201401c,c2014008,c209e000,c209ee28,2,1e10029,d83b002c) at wskbd_input+0x4f
 ukbd_decode(c209e000,0,2,c2031e48,3,c1446184,c209e000,0,c14461e0,d8590074) at ukbd_decode+0x1b1
 callout_softclock(0,c090df50,d8590074,c0100400,1606000,1610010,30,c0100010,c1edc540,0) at callout_softclock+0x344
 softint_dispatch(c1edcd20,2,c87,5a061084,7fbfdfe7,eebffff1,d85a3ff0,d85a3f98,c1edc2a0,80050033) at softint_dispatch+0xc9
 Bad frame pointer: 0xc2031208
 Andreas Gustafsson,

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