[Bug 220593] System panic after FC SAN storage detached

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=220593

            Bug ID: 220593
           Summary: System panic after FC SAN storage detached
           Product: Base System
           Version: 11.0-RELEASE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: steel.liu at huawei.com

The system version is FreeBSD 11.0-RELEASE-p1

FC SAN disk was formated as ufs filesystem and mounted. When we read/write from
the filesystem, we detached the storage array and the operating system crushed.

The dump info like following.

Device da2 went missing before all of the data could be written to it; expect
data loss.
panic: devfs_fsync: vop_stdfsync failed.
cpuid=5
KDB: stack backtrace
#0 0xffffffff80b24077 at kdb_backtrace+0x67
#1 0xffffffff80ad93e2 at vpanic+0x182
#2 0xffffffff80ad9253 at panic+0x43
#3 0xffffffff80985bdf at devfs_fsync+0x8f
#4 0xffffffff8110bbcd at VOP_FSYNC_APV+0x8d
#5 0xffffffff80bb2c7e at sched_sync+0x3be
#6 0xffffffff80a90055 at fork_exit+0x85
#7 0xffffffff80f8467e at fork_trampoline+0xe
Uptime: 8m8s
Automatic reboot in 15 seconds - press a key on the console to abort

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