[Bug 245683] panic: solaris assert: HDR_EMPTY(hdr), file: /usr/src/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/arc.c, line: 6271

Fri Apr 17 06:19:50 UTC 2020

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=245683

            Bug ID: 245683
           Summary: panic: solaris assert: HDR_EMPTY(hdr), file:
                    /usr/src/sys/cddl/contrib/opensolaris/uts/common/fs/zf
                    s/arc.c, line: 6271
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs at FreeBSD.org
          Reporter: delphij at FreeBSD.org

I'm seeing this panic occasionally on my laptop.

Backtrace (from core.txt):

(kgdb) #0  doadump (textdump=0) at src/sys/amd64/include/pcpu_aux.h:55
#1  0xffffffff84e5ea51 in vt_kms_postswitch (arg=0xfffff80006b2b380)
    at /p51/home/delphij/kms-drm/drivers/gpu/drm/linux_fb.c:89
#2  0xffffffff80a2d7c2 in vt_window_switch (vw=0xffffffff818e5b58)
    at /usr/src/sys/dev/vt/vt_core.c:603
#3  0xffffffff80a2ad3f in vtterm_cngrab (tm=<value optimized out>)
    at /usr/src/sys/dev/vt/vt_core.c:1612
#4  0xffffffff80b5cac6 in cngrab () at /usr/src/sys/kern/kern_cons.c:397
#5  0xffffffff80bc0d4c in vpanic (
    fmt=0xffffffff82580209 "solaris assert: %s, file: %s, line: %d", 
    ap=0xfffffe00e1c85960) at /usr/src/sys/kern/kern_shutdown.c:887
#6  0xffffffff80bc0b93 in panic (fmt=<value optimized out>)
    at /usr/src/sys/kern/kern_shutdown.c:839
#7  0xffffffff8257f21a in assfail (a=<value optimized out>, 
    f=<value optimized out>, l=<value optimized out>)
    at /usr/src/sys/cddl/compat/opensolaris/kern/opensolaris_cmn_err.c:81
#8  0xffffffff82144359 in arc_release (buf=0xfffff804d08a03c0, 
    tag=0xfffff8000f508160)
    at /usr/src/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/arc.c:6271
#9  0xffffffff82152e35 in dbuf_free_range (dn=<value optimized out>, 
    start_blkid=0, end_blkid=0, tx=0xfffff806d9c8f500)
    at /usr/src/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/dbuf.c:2098
#10 0xffffffff8217c0be in dnode_free_range (dn=0xfffff8063bb5bb40, 
    off=<value optimized out>, len=<value optimized out>, 
    tx=0xfffff806d9c8f500)
    at /usr/src/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/dnode.c:2123
#11 0xffffffff82161183 in dmu_free_long_range (os=<value optimized out>, 
    object=<value optimized out>, offset=<value optimized out>, 
    length=<value optimized out>)
    at /usr/src/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/dmu.c:869
#12 0xffffffff8220b7a2 in zfs_freesp (zp=0xfffff8062a7ccea0, off=0, len=0, 
    flag=<value optimized out>, log=0)
    at /usr/src/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/zfs_znode.c:1743
#13 0xffffffff8224b501 in zfs_freebsd_setattr (ap=<value optimized out>)
    at /usr/src/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/zfs_vnops.c:2933
#14 0xffffffff810e06b5 in VOP_SETATTR_APV (vop=0xffffffff823161e0, 
    a=0xfffffe00e1c86778) at vnode_if.c:739
#15 0xffffffff80caf23e in vn_truncate_locked (vp=0xfffff805bad913d0, length=0, 
    sync=false, cred=0xfffff8000f68a900) at vnode_if.h:335
#16 0xffffffff80cac985 in vn_truncate (fp=0xfffff805aa03de60, length=0, 
    active_cred=0xfffff8000f68a900, td=<value optimized out>)
    at /usr/src/sys/kern/vfs_vnops.c:1329
#17 0xffffffff80ca59fd in kern_openat (td=0xfffffe012a066700, 
    fd=<value optimized out>, path=<value optimized out>, 
    pathseg=<value optimized out>, flags=<value optimized out>, 
    mode=<value optimized out>) at src/sys/sys/file.h:334
#18 0xffffffff84cb6415 in filemon_wrapper_openat (td=0xfffffe012a066700, 
    uap=0xfffffe012a066ad8) at src/sys/dev/filemon/filemon_wrapper.c:232
#19 0xffffffff81065c60 in amd64_syscall (td=0xfffffe012a066700, traced=0)
    at src/sys/amd64/amd64/../../kern/subr_syscall.c:162
#20 0xffffffff8103b510 in fast_syscall_common ()
    at /usr/src/sys/amd64/amd64/exception.S:584
#21 0x000000080bb67caa in ?? ()
Previous frame inner to this frame (corrupt stack?)
Current language:  auto; currently minimal
(kgdb) 

It's not really clear to me what is triggering this, but it seems to happen
when saving files in vscode-oss.  Looks like the system is trying to truncate a
file:

(kgdb) up
#13 0xffffffff8224b501 in zfs_freebsd_setattr (ap=<value optimized out>) at
/usr/src/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/zfs_vnops.c:2933
2933                    err = zfs_freesp(zp, vap->va_size, 0, 0, FALSE);

(kgdb) print *(a->a_vap)
$4 = {va_type = VNON, va_mode = 65535, va_padding0 = 0, va_uid = 4294967295,
va_gid = 4294967295, va_nlink = 18446744073709551615, va_fsid =
18446744073709551615, va_fileid = 18446744073709551615, va_size = 0,
va_blocksize = -1, 
  va_atime = {tv_sec = -1, tv_nsec = -1}, va_mtime = {tv_sec = -1, tv_nsec =
-1}, va_ctime = {tv_sec = -1, tv_nsec = -1}, va_birthtime = {tv_sec = -1,
tv_nsec = -1}, va_gen = 18446744073709551615, va_flags = 18446744073709551615, 
  va_rdev = 18446744073709551615, va_bytes = 18446744073709551615, va_filerev =
0, va_vaflags = 0, va_spare = 128}

A quick Google search suggests that this might be the same as
https://github.com/openzfs/zfs/issues/9897 .

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