NetBSD Problem Report #56954

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Date: Fri,  5 Aug 2022 23:47:29 +0000 (UTC)
From: germain.lechapelain@lanvaux.fr
Reply-To: germain.lechapelain@lanvaux.fr
To: gnats-bugs@NetBSD.org
Subject: Kernel panic when attempting copying a file from a thumb-stick
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>Number:         56954
>Category:       kern
>Synopsis:       Kernel panic when attempting copying a file from a thumb-stick
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Fri Aug 05 23:50:00 +0000 2022
>Last-Modified:  Sat Aug 06 01:35:01 +0000 2022
>Originator:     Germain Le Chapelain
>Release:        Daily August 1st ?
>Organization:
Lanvaux Computer Games Limited
>Environment:
NetBSD germ2.lanvaux.fr 9.99.99 NetBSD 9.99.99 (GENERIC) #0: Mon Aug  1 01:32:15 UTC 2022  mkrepro@mkrepro.NetBSD.org:/usr/src/sys/arch/amd64/compile/GENERIC amd64

>Description:
Upon intending to copy a file from a USB drive I was met with the following kernel panic:

crash: _kvm_kvatop(0)
Kernel compiled without options LOCKDEBUG.
System panicked: kernel diagnostic assertion "(flags & UFP_NOBUSY) != 0 || rw_write_held(uobj->vmobjlock)" failed: file "/usr/src/sys/uvm/uvm_vnode.c", line 304
Backtrace from time of crash is available.
crash> bt
__kernel_end() at 0
kern_reboot() at sys_reboot
vpanic() at vpanic+0x18d
kern_assert() at __x86_indirect_thunk_rax
uvn_findpage() at uvn_findpage+0x1f1
uvn_findpages() at uvn_findpages+0xdd
genfs_compat_getpages() at genfs_compat_getpages+0x19d
VOP_GETPAGES() at VOP_GETPAGES+0x80
uvn_get() at uvn_get+0xbe
uvm_fault_internal() at uvm_fault_internal+0x10f1
trap() at trap+0x480
--- trap (number 6) ---
copyin() at copyin+0x2f
ubc_uiomove() at ubc_uiomove+0x162
ffs_write() at ffs_write+0x262
VOP_WRITE() at VOP_WRITE+0xd8
vn_write() at vn_write+0xe0
dofilewrite() at dofilewrite+0x80
sys_write() at sys_write+0x49
syscall() at syscall+0x196
--- syscall (number 4) ---
syscall+0x196:

>How-To-Repeat:
So far I know, format a GPT thumb stick (relatively large: 57GB.

I had to use diskpart under Windows bc I was already having troubles bringing it up in the File Explorer to get my file from there.)


In dmesg, I spotted sd0/dk3 being created

As root:

mount /dev/dk3 /mnt/key
ctrl-d (exit root)
cd /mnt/key
cp key-thinkcentre ~

Crash <-
>Fix:
N/A

>Audit-Trail:
From: Germain Le Chapelain <germain.lechapelain@lanvaux.fr>
To: gnats-bugs@netbsd.org
Cc: 
Subject: Re: kern/56954: Kernel panic when attempting copying a file from a
 thumb-stick
Date: Fri, 5 Aug 2022 17:13:41 -0700

 Additional info:

 germ2# gpt show sd0
       start       size  index  contents
           0          1         PMBR
           1          1         Pri GPT header
           2         32         Pri GPT table
          34       2014         Unused
        2048  120930304      1  GPT part - Windows basic data
   120932352       1503         Unused
   120933855         32         Sec GPT table
   120933887          1         Sec GPT header
 germ2# file -skr /dev/rdk3
 /dev/rdk3: DOS/MBR boot sector, code offset 0x52+2, OEM-ID "NTFS    ", sectors/cluster 8, Media descriptor 0xf8, sectors/track 63, heads 255, hidden sectors 2048, dos < 4.0 BootSector (0x0), FAT (1Y bit by descriptor); NTFS, sectors/track 63, physical drive 0x80, sectors 120930303, $MFT start cluster 786432, $MFTMirror start cluster 2, bytes/RecordSegment 2^(-1*246), clusters/index block 1, serial number 0949297ce9297b2ea; contains bootstrap BOOTMGR
 - DOS/MBR boot sector
 -  DOS/MBR boot sector DOS executable (COM), boot code
 - data
 germ2#


 -- 
 Germain Le Chapelain <germain.lechapelain@lanvaux.fr>

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