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Date:      Sat, 11 Mar 2017 18:17:24 +0000
From:      bugzilla-noreply@freebsd.org
To:        freebsd-bugs@FreeBSD.org
Subject:   [Bug 217708] panic: pfs_add_node() homonymous siblings in sys/fs/pseudofs/pseudofs.c
Message-ID:  <bug-217708-8-kQ34AId3pI@https.bugs.freebsd.org/bugzilla/>
In-Reply-To: <bug-217708-8@https.bugs.freebsd.org/bugzilla/>
References:  <bug-217708-8@https.bugs.freebsd.org/bugzilla/>

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=217708

--- Comment #1 from Dave Cottlehuber <dch@skunkwerks.at> ---
root@akai /u/o/u/s/s/GENERIC#  kgdb kernel.debug /var/crash/vmcore.last 
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 conditions.
Type "show copying" to see the conditions.
There is absolutely no warranty for GDB.  Type "show warranty" for details.
This GDB was configured as "amd64-marcel-freebsd"...

Unread portion of the kernel message buffer:
[327] vt_kms_postswitch() at vt_kms_postswitch+0x52/frame 0xfffffe0464f80430
[327] vt_window_switch() at vt_window_switch+0xdb/frame 0xfffffe0464f80470
[327] vtterm_cngrab() at vtterm_cngrab+0x20/frame 0xfffffe0464f80490
[327] cngrab() at cngrab+0x32/frame 0xfffffe0464f804b0
[327] vpanic() at vpanic+0x10a/frame 0xfffffe0464f80530
[327] kassert_panic() at kassert_panic+0x126/frame 0xfffffe0464f805a0
[327] pfs_add_node() at pfs_add_node+0x114/frame 0xfffffe0464f805d0
[327] pfs_create_link() at pfs_create_link+0xc5/frame 0xfffffe0464f80620
[327] linprocfs_dirfill() at linprocfs_dirfill+0x9c/frame 0xfffffe0464f80680
[327] pfs_iterate() at pfs_iterate+0x251/frame 0xfffffe0464f806f0
[327] Dumping 1034 out of 16254 MB: (CTRL-C to abort)
..2%..11%..21%..31%..41%..52%..61%..72%..81%..92%

...
Loaded symbols for /boot/kernel/debugfs.ko
#0  doadump (textdump=0) at pcpu.h:232
232             __asm("movq %%gs:%1,%0" : "=r" (td)

(kgdb) list
227     static __inline __pure2 struct thread *
228     __curthread(void)
229     {
230             struct thread *td;
231     
232             __asm("movq %%gs:%1,%0" : "=r" (td)
233                 : "m" (*(char *)OFFSETOF_CURTHREAD));
234             return (td);
235     }
236     #ifdef __clang__
Current language:  auto; currently minimal

up

#1  0xffffffff83ef3697 in vt_kms_postswitch (arg=<value optimized out>) at
/usr/src/sys/modules/drm/drm/../../../dev/drm/linux_fb.c:80


I had to stop here as my source was already pulled for building a new kernel..

I'll finish that and re-try this very repeatable crash.

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