Date: Thu, 14 Feb 2019 12:38:13 -0800 From: Steve Kargl <sgk@troutmask.apl.washington.edu> To: John Baldwin <jhb@freebsd.org> Cc: freebsd-current@freebsd.org Subject: Re: Panic in sys_fstatat() Message-ID: <20190214203813.GA75902@troutmask.apl.washington.edu> In-Reply-To: <786f8034-b3ef-54cb-043b-e189e752b18b@FreeBSD.org> References: <20190214024703.GA51003@troutmask.apl.washington.edu> <786f8034-b3ef-54cb-043b-e189e752b18b@FreeBSD.org>
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On Thu, Feb 14, 2019 at 12:26:01PM -0800, John Baldwin wrote: > On 2/13/19 6:47 PM, Steve Kargl wrote: > > #16 0x00ff58bb in trap (frame=0x2e7b6880) at /usr/src/sys/i386/i386/trap.c:519 > > #17 0xffc0315d in ?? () > > #18 0x2e7b6880 in ?? () > > #19 0x00d1de64 in lookup (ndp=0x2e7b6a50) > > at /usr/src/sys/kern/vfs_lookup.c:710 > > #20 0x00d1d763 in namei (ndp=0x2e7b6a50) at /usr/src/sys/kern/vfs_lookup.c:487 > > #21 0x00d372c5 in kern_statat (td=0x3c5dc700, flag=0, fd=-100, > > path=0x2cced08e <error: Cannot access memory at address 0x2cced08e>, > > pathseg=UIO_USERSPACE, sbp=0x2e7b6b18, hook=0x0) > > at /usr/src/sys/kern/vfs_syscalls.c:2307 > > #22 0x00d37c99 in sys_fstatat (td=0x3c5dc700, uap=0x3c5dc988) > > at /usr/src/sys/kern/vfs_syscalls.c:2284 > > #23 0x00ff69fa in syscallenter (td=<optimized out>) > > at /usr/src/sys/i386/i386/../../kern/subr_syscall.c:135 > > #24 syscall (frame=0x2e7b6ce8) at /usr/src/sys/i386/i386/trap.c:1144 > > #25 0xffc033a7 in ?? () > > #26 0x2e7b6ce8 in ?? () > > Backtrace stopped: Cannot access memory at address 0xfbafbbbc > > (kgdb) > > Frame 18 is probably the root problem, though it doesn't look like kgdb is > able to unwind it correctly. Looking at frame 19 might help though. It > seems like a NULL pointer dereference when invoking VOP_LOCK. > I can't look at this until tonight (about 6-7 hours). Anything in frame 19 that you would be particularly interested in? -- Steve
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