https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=251320
Bug ID: 251320
Summary: vfs_domount_first: do not crash on mount failure
Product: Base System
Version: 12.2-RELEASE
Hardware: amd64
OS: Any
Status: New
Severity: Affects Only Me
Priority: ---
Component: kern
Assignee: b...@freebsd.org
Reporter: ztong0...@gmail.com
Created attachment 219896
--> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=219896&action=edit
patch
vfs_write_suspend_umnt() expect a non-zero vfs_write_suspend_umnt,
otherwise it will panic, however in vfs_domount_first(), the counter
is zero when calling VFS_UNMOUNT()
panic: vn_finished_write: neg cnt
cpuid = 7
time = 1606004193
KDB: stack backtrace:
#0 0xffffffff80c0a8f5 at kdb_backtrace+0x65
freebsd#1 0xffffffff80bbeb1b at vpanic+0x17b
freebsd#2 0xffffffff80bbe993 at panic+0x43
freebsd#3 0xffffffff80c9da05 at vn_finished_write+0xc5
freebsd#4 0xffffffff80c9f726 at vfs_write_suspend_umnt+0x16
freebsd#5 0xffffffff80ecdd31 at ffs_unmount+0x71
freebsd#6 0xffffffff80c844dd at vfs_domount+0xc0d
freebsd#7 0xffffffff80c83228 at vfs_donmount+0x988
freebsd#8 0xffffffff80c82871 at sys_nmount+0x71
freebsd#9 0xffffffff810904c7 at amd64_syscall+0x387
freebsd#10 0xffffffff8106785e at fast_syscall_common+0xf8
Uptime: 2h10m11s
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