[Bug 240853] Any moderate I/O panics the kernel when MAC_BIBA + multilabel is enabled

[bugzilla-noreply at freebsd.org]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=240853

            Bug ID: 240853
           Summary: Any moderate I/O panics the kernel when MAC_BIBA +
                    multilabel is enabled
           Product: Base System
           Version: 12.0-RELEASE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs at FreeBSD.org
          Reporter: realkay at mailbox.org

/dev/vtbd0p2 on / (ufs, local, noatime, journaled soft-updates, multilabel)


Any moderate I/O, such as running a find /, installing a package larger than
some arbitrary (and changing) size, or even reloading a tmux session with a
couple of windows and panes is enough to trigger this.

cpuid = 0
time = 1569485155
KDB: stack backtrace:
#0 0xffffffff80be78d7 at kdb_backtrace+0x67
#1 0xffffffff80b9b4b3 at vpanic+0x1a3
#2 0xffffffff80b9b303 at panic+0x43
#3 0xffffffff80e979f6 at softdep_deallocate_dependencies+0x76
#4 0xffffffff80c4a27f at brelse+0x16f
#5 0xffffffff80c4e7fd at buf_recycle+0x2ad
#6 0xffffffff80c48a3d at bufkva_reclaim+0x3d
#7 0xffffffff80c01899 at vmem_xalloc+0x469
#8 0xffffffff80c013f1 at vmem_alloc+0x31
#9 0xffffffff80c4f805 at bufkva_alloc+0xa5
#10 0xffffffff80c4c429 at getnewbuf+0x319
#11 0xffffffff80c49944 at getblkx+0x484
#12 0xffffffff80c4c0f5 at getblk+0x15
#13 0xffffffff80e8b71c at ffs_balloc_ufs2+0xd1c
#14 0xffffffff80ebb496 at ffs_close_ea+0x1b6
#15 0xffffffff811fc93e at VOP_SETEXTATTR_APV+0x7e
#16 0xffffffff80c7d05e at vn_extattr_set+0x13e
#17 0xffffffff826abbf6 at biba_vnode_create_extattr+0x126
Uptime: 40s


Since 12.1-RELEASE is coming, I figured it would be a good time to report this.
The presence of this bug makes MAC_BIBA unusable, which is a shame.

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