Change Details

I don't have a great way to stress IO path. Some basic UFS activity with the patch seems to work.

Repro: db> show mount 0xfffff80007833330 /dev/vtbd0p2 on / (ufs) ... $ kgdb ... (gdb) p ((struct ufsmount*)((struct mount*)0xfffff80007833330).mnt_data).um_devvp $5 = (struct vnode *) 0xfffff80007846ce8 ... $ sysctl 'debug.fail_point.ffs_backgroundwritedone_error=return(0x07846ce8)' $ sync (Before): Panic in bdirty -> reassignbuf (After): No panic, log shows "ffs_backgroundwritedone: Erroring IO ..."

I don't have a great way to stress IO path. Some basic UFS activity with the Repro: patch seems to work. db> show mount 0xfffff80007833330 /dev/vtbd0p2 on / (ufs) ... $ kgdb ... (gdb) p ((struct ufsmount*)((struct mount*)0xfffff80007833330).mnt_data).um_devvp $5 = (struct vnode *) 0xfffff80007846ce8 ... $ sysctl 'debug.fail_point.ffs_backgroundwritedone_error=return(0x07846ce8)' $ sync (Before): Panic in bdirty -> reassignbuf (After): No panic, log shows "ffs_backgroundwritedone: Erroring IO ..."