https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=243973
Bug ID: 243973
Summary: [zfs] zfs rollback segmentation fault
Product: Base System
Version: 12.1-RELEASE
Hardware: amd64
OS: Any
Status: New
Severity: Affects Only Me
Priority: ---
Component: bin
Assignee: b...@freebsd.org
Reporter: reshadpatu...@gmail.com
Created attachment 211466
--> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=211466&action=edit
ZFS core file (xz compressed)
I have a FreeBSD 12.1 system running zfs as root (default zfs install) + pkg
base installed (all 318 packages).
While I was testing the rollback of a system update using the 'zfs rollback'
command after 'pkg upgrade -f' and I noticed that zfs rollback for
'zroot/ROOT/default@pre-update' is segfaulting.
Strangely if I run the same command again after sleeping for 10 seconds it
works flawlessly every time.
Here is the backtrace for the segmentation fault from the core file.
-----
(gdb) backtrace
#0 0x00000008004a7e4a in pthread_rwlock_unlock_exp (p0=0x6) at
/usr/src/lib/libc/gen/_pthread_stubs.c:249
#1 0x000000080029402e in zcmd_ioctl (fd=6, request=25, zc=0x6) at
/usr/src/cddl/contrib/opensolaris/lib/libzfs/common/libzfs_compat.c:113
#2 0x0000000800292374 in lzc_ioctl (ioc=3222821401, name=<optimized out>,
source=<optimized out>, resultp=0x7fffffffdc40) at
/usr/src/cddl/contrib/opensolaris/lib/libzfs_core/common/libzfs_core.c:187
#3 0x0000000800293492 in lzc_rollback_to (fsname=0xc0185a19 <error: Cannot
access memory at address 0xc0185a19>, snapname=<optimized out>) at
/usr/src/cddl/contrib/opensolaris/lib/libzfs_core/common/libzfs_core.c:869
#4 0x00000008002dc381 in zfs_rollback (zhp=0x800839280, snap=<optimized out>,
force=<optimized out>) at
/usr/src/cddl/contrib/opensolaris/lib/libzfs/common/libzfs_dataset.c:4194
#5 0x000000000020e2a1 in zfs_do_rollback (argc=<optimized out>,
argv=0x7fffffffeb18) at
/usr/src/cddl/contrib/opensolaris/cmd/zfs/zfs_main.c:3574
#6 0x000000000020c6a4 in main (argc=<optimized out>, argv=0x7fffffffeb10) at
/usr/src/cddl/contrib/opensolaris/cmd/zfs/zfs_main.c:7507
(gdb)
-----
I have attached the zfs.core file along with the shell script to reproduce the
segmentation fault.
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