Interesting panic from the Yahoo builder (10-current)

[Sean Bruno]

Our "yBSD" builder needs to mount a disk image temporarily that has a
dos partition (for openstack-ish things) to put configs into it.  It
seems that under high stress, we can squeeze a panic out of it in
namei().

Sean


Unread portion of the kernel message buffer:
panic: namei: nameiop contaminated with flags
cpuid = 8
KDB: stack backtrace:
db_trace_self_wrapper() at db_trace_self_wrapper+0x2b/frame 0xfffffe048d8e53b0
kdb_backtrace() at kdb_backtrace+0x39/frame 0xfffffe048d8e5460
vpanic() at vpanic+0x126/frame 0xfffffe048d8e54a0
kassert_panic() at kassert_panic+0x136/frame 0xfffffe048d8e5510
namei() at namei+0x2c8/frame 0xfffffe048d8e5600
msdosfs_mount() at msdosfs_mount+0x556/frame 0xfffffe048d8e57c0
vfs_donmount() at vfs_donmount+0xc35/frame 0xfffffe048d8e5aa0
sys_nmount() at sys_nmount+0x72/frame 0xfffffe048d8e5ae0
amd64_syscall() at amd64_syscall+0x223/frame 0xfffffe048d8e5bf0
Xfast_syscall() at Xfast_syscall+0xfb/frame 0xfffffe048d8e5bf0
--- syscall (378, FreeBSD ELF64, sys_nmount), rip = 0x8000a8b68a, rsp = 0x7fffffffd508, rbp = 0x7fffffffdb30 ---
Uptime: 34m55s
Dumping 1140 out of 16350 MB:..2%..12%..22%..31%..41%..51%..61%..71%..82%..92%

Reading symbols from /boot/modules/msdosfs.ko...done.
Loaded symbols for /boot/modules/msdosfs.ko
#0  doadump (textdump=1) at pcpu.h:227
227	pcpu.h: No such file or directory.
	in pcpu.h
(kgdb) Hangup detected on fd 0
error detected on stdin
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