Date: Sun, 18 Feb 2018 20:14:48 -0500 From: Allan Jude <allanjude@freebsd.org> To: freebsd-fs <freebsd-fs@freebsd.org>, Kirk McKusick <mckusick@mckusick.com> Subject: UFS panic when attempting to mount wrong device Message-ID: <8be41fc8-ea0a-da87-da89-68f531f1cb88@freebsd.org>
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From: Allan Jude <allanjude@freebsd.org>
To: freebsd-fs <freebsd-fs@freebsd.org>, Kirk McKusick <mckusick@mckusick.com>
Message-ID: <8be41fc8-ea0a-da87-da89-68f531f1cb88@freebsd.org>
Subject: UFS panic when attempting to mount wrong device
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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 =3D 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=3D1) at
/zroot/zfs_zstd/head/sys/kern/kern_shutdown.c:347
#2 0xffffffff80ac9242 in kern_reboot (howto=3D260) at
/zroot/zfs_zstd/head/sys/kern/kern_shutdown.c:416
#3 0xffffffff80ac980d in vpanic (fmt=3D<optimized out>,
ap=3D0xfffffe00344095f0) at /zroot/zfs_zstd/head/sys/kern/kern_shutdown.c=
:812
#4 0xffffffff80ac9620 in kassert_panic (fmt=3D0xffffffff81157632 "vtopde=
on a uva/gpa 0x%0lx") at /zroot/zfs_zstd/head/sys/kern/kern_shutdown.c:69=
8
#5 0xffffffff80f683a1 in vtopde (va=3D0) at
/zroot/zfs_zstd/head/sys/amd64/amd64/pmap.c:835
#6 pmap_kextract (va=3D0) at /zroot/zfs_zstd/head/sys/amd64/amd64/pmap.c=
:2237
#7 0xffffffff80aa3f2e in vtoslab (va=3D0) at
/zroot/zfs_zstd/head/sys/vm/uma_int.h:455
#8 free (addr=3D0x8, mtp=3D0xffffffff8189bb20 <M_UFSMNT>) at
/zroot/zfs_zstd/head/sys/kern/kern_malloc.c:701
#9 0xffffffff80dc278f in ffs_mountfs (devvp=3D<optimized out>,
mp=3D<optimized out>, td=3D<optimized out>)
at /zroot/zfs_zstd/head/sys/ufs/ffs/ffs_vfsops.c:1047
#10 ffs_mount (mp=3D0xfffff80085dda000) at
/zroot/zfs_zstd/head/sys/ufs/ffs/ffs_vfsops.c:531
#11 0xffffffff80b8ebc6 in vfs_domount_first (td=3D<optimized out>,
fspath=3D0xfffff80003723800 "/mnt", vp=3D0xfffff80085baf938, vfsp=3D<opti=
mized
out>,
fsflags=3D<optimized out>, optlist=3D<optimized out>) at
/zroot/zfs_zstd/head/sys/kern/vfs_mount.c:827
#12 vfs_domount (td=3D<optimized out>, fstype=3D<optimized out>,
fspath=3D<optimized out>, fsflags=3D<optimized out>, optlist=3D<optimized=
out>)
at /zroot/zfs_zstd/head/sys/kern/vfs_mount.c:1117
#13 vfs_donmount (td=3D0xfffff800139c6560, fsflags=3D<optimized out>,
fsoptions=3D0xfffff800054d6e00) at
/zroot/zfs_zstd/head/sys/kern/vfs_mount.c:684
#14 0xffffffff80b8dc42 in sys_nmount (td=3D0xfffff800139c6560,
uap=3D0xfffff800139c6918) at /zroot/zfs_zstd/head/sys/kern/vfs_mount.c:42=
7
#15 0xffffffff80f7ed0b in syscallenter (td=3D0xfffff800139c6560) at
/zroot/zfs_zstd/head/sys/amd64/amd64/../../kern/subr_syscall.c:134
#16 amd64_syscall (td=3D0xfffff800139c6560, traced=3D0) 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?
--=20
Allan Jude
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