[disk changes] CVS commit: src/sys/dev/dkwedge

[Maxime Villard]

> Module Name:    src
> Committed By:   jdolecek
> Date:           Sat Apr 11 16:00:34 UTC 2020
>
> Modified Files:
>         src/sys/dev/dkwedge: dkwedge_apple.c dkwedge_bsdlabel.c dkwedge_gpt.c
>             dkwedge_mbr.c dkwedge_rdb.c

It appears that since your recent changes, there is a systematic
use-after-free:

        panic: ASan: Unauthorized Access in 0x...: Addr 0x... [2 bytes, read, 
PoolUseAfterFree]
        wdc_ata_bio()
        wdstart1()
        wd_diskstart()
        dk_start()
        bdev_strategy()
        spec_strategy()
        VOP_STRATEGY()
        genfs_getpages()
        VOP_GETPAGES()
        ubc_fault()
        uvm_fault_internal()
        trap()
        --- trap (number 6) ---
        copyout()
        uiomove()
        ubc_uiomove()
        ffs_read()
        VOP_READ()
        vn_read()
        dofileread()
        sys_read()
        syscall()

This is reliably reproductible by just booting KASAN on amd64.

Can you give a look?

Thanks,
Maxime