UFS panic when attempting to mount wrong device

[Allan Jude]

I accidentally forgot to specify -t cd9660 when mounting a CD image, and
UFS panicked the machine:

Unread portion of the kernel message buffer:
panic: vtopde on a uva/gpa 0x0
cpuid = 1
KDB: stack backtrace:
db_trace_self_wrapper() at db_trace_self_wrapper+0x2b/frame
0xfffffe0034409550
vpanic() at vpanic+0x18d/frame 0xfffffe00344095b0
vpanic() at vpanic/frame 0xfffffe0034409630
pmap_kextract() at pmap_kextract+0x121/frame 0xfffffe0034409660
free() at free+0x5e/frame 0xfffffe00344096a0
ffs_mount() at ffs_mount+0xe2f/frame 0xfffffe0034409840
vfs_donmount() at vfs_donmount+0xf56/frame 0xfffffe0034409a80
sys_nmount() at sys_nmount+0x72/frame 0xfffffe0034409ac0
amd64_syscall() at amd64_syscall+0x79b/frame 0xfffffe0034409bf0
fast_syscall_common() at fast_syscall_common+0x101/frame 0x7fffffffd990



(kgdb) bt
#0  __curthread () at ./machine/pcpu.h:230
#1  doadump (textdump=1) at
/zroot/zfs_zstd/head/sys/kern/kern_shutdown.c:347
#2  0xffffffff80ac9242 in kern_reboot (howto=260) at
/zroot/zfs_zstd/head/sys/kern/kern_shutdown.c:416
#3  0xffffffff80ac980d in vpanic (fmt=<optimized out>,
ap=0xfffffe00344095f0) at /zroot/zfs_zstd/head/sys/kern/kern_shutdown.c:812
#4  0xffffffff80ac9620 in kassert_panic (fmt=0xffffffff81157632 "vtopde
on a uva/gpa 0x%0lx") at /zroot/zfs_zstd/head/sys/kern/kern_shutdown.c:698
#5  0xffffffff80f683a1 in vtopde (va=0) at
/zroot/zfs_zstd/head/sys/amd64/amd64/pmap.c:835
#6  pmap_kextract (va=0) at /zroot/zfs_zstd/head/sys/amd64/amd64/pmap.c:2237
#7  0xffffffff80aa3f2e in vtoslab (va=0) at
/zroot/zfs_zstd/head/sys/vm/uma_int.h:455
#8  free (addr=0x8, mtp=0xffffffff8189bb20 <M_UFSMNT>) at
/zroot/zfs_zstd/head/sys/kern/kern_malloc.c:701
#9  0xffffffff80dc278f in ffs_mountfs (devvp=<optimized out>,
mp=<optimized out>, td=<optimized out>)
    at /zroot/zfs_zstd/head/sys/ufs/ffs/ffs_vfsops.c:1047
#10 ffs_mount (mp=0xfffff80085dda000) at
/zroot/zfs_zstd/head/sys/ufs/ffs/ffs_vfsops.c:531
#11 0xffffffff80b8ebc6 in vfs_domount_first (td=<optimized out>,
fspath=0xfffff80003723800 "/mnt", vp=0xfffff80085baf938, vfsp=<optimized
out>,
    fsflags=<optimized out>, optlist=<optimized out>) at
/zroot/zfs_zstd/head/sys/kern/vfs_mount.c:827
#12 vfs_domount (td=<optimized out>, fstype=<optimized out>,
fspath=<optimized out>, fsflags=<optimized out>, optlist=<optimized out>)
    at /zroot/zfs_zstd/head/sys/kern/vfs_mount.c:1117
#13 vfs_donmount (td=0xfffff800139c6560, fsflags=<optimized out>,
fsoptions=0xfffff800054d6e00) at
/zroot/zfs_zstd/head/sys/kern/vfs_mount.c:684
#14 0xffffffff80b8dc42 in sys_nmount (td=0xfffff800139c6560,
uap=0xfffff800139c6918) at /zroot/zfs_zstd/head/sys/kern/vfs_mount.c:427
#15 0xffffffff80f7ed0b in syscallenter (td=0xfffff800139c6560) at
/zroot/zfs_zstd/head/sys/amd64/amd64/../../kern/subr_syscall.c:134
#16 amd64_syscall (td=0xfffff800139c6560, traced=0) at
/zroot/zfs_zstd/head/sys/amd64/amd64/trap.c:935
#17 0xffffffff80f5a66d in fast_syscall_common () at
/zroot/zfs_zstd/head/sys/amd64/amd64/exception.S:480
#18 0x0000000800c78000 in ?? ()


That that maybe a double free?


-- 
Allan Jude

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