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From: John Baldwin <jhb@freebsd.org>
To: freebsd-current@freebsd.org
Cc: grarpamp <grarpamp@gmail.com>
Subject: Re: LOR panic on mount -uw
Date: Thu, 12 Oct 2017 08:15:26 -0700
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On Wednesday, October 11, 2017 05:18:17 PM grarpamp wrote:
> Let 12.0-current r324306 amd64 efi boot from usb to installer screen,
> try to write zeroes to an unallocated part of ada0, mount -uw a
> separate part of ada0 ...
> 
> 1st 0xc5ce5f0 ufs kern/vfs_mount.c:1274
> 2nd 0xc565b78 devfs ufs/ffs/ffs_vfsops.c:1414
> 
> db_trace_self_wrapper
> vpanic
> kassert_panic+0x126
> g_access+0x2b9/frame 0xfffffe0458a31550
> ffs_mount+0x1092/frame 0xfffffe0458a31700
> vfs_donmount+0x13b8/frame 0xfffffe0458a31940
> sys_nmount+0x72/frame 0xfffffe0458a31980
> amd64_syscall+0x79b/frame 0xfffffe0458a3a1b0
> Xfast_syscall+0xfb/frame 0xfffffe0458a31ab0
> syscall (378, FreeBSD ELF64, sys_nmount), rip = 0x800a88d6a, rsp =
> 0x7fffffffd428, rbp = 0x7fffffffd990
> kdb_enter+0x3b: movq $0,kdb_why

In this case the panic is separate from the LOR, and for a panic we really
need the panic message in addition to the stack trace.

-- 
John Baldwin