[DragonFlyBSD - Bug #3348] (Resolved) Panic when trying to mount_hammer2 a file

[bugtracker-admin at leaf.dragonflybsd.org]

Issue #3348 has been updated by liweitianux.

Category set to VFS subsystem
Status changed from New to Resolved
Assignee set to tkusumi
% Done changed from 0 to 100

This KKASSERT() panic has been resolved in commit 8fd12ec463befacc05099d651f1acfd4ef17a4e5 by tkusumi in 2023.

I also cherry-picked this fix to 6.4 branch.

The new output looks like:
<pre>
# mount_hammer2 ./hammer2.img /mnt
mount_hammer2: /dev/./hammer2.img at DATA not found
</pre>

With dmesg showed messages:
<pre>
hammer2_mount: devstr="/dev/./hammer2.img at DATA"
hammer2_mount: device="/dev/./hammer2.img" label="DATA" rdonly=0
hammer2_ondisk: failed to nlookup /dev/./hammer2.img 2
hammer2_ondisk: failed to lookup /dev/./hammer2.img 2
hammer2: failed to initialize devvp in /dev/./hammer2.img
</pre>

----------------------------------------
Bug #3348: Panic when trying to mount_hammer2 a file
http://bugs.dragonflybsd.org/issues/3348#change-14610

* Author: zabolekar
* Status: Resolved
* Priority: Normal
* Assignee: tkusumi
* Category: VFS subsystem
* Target version: 6.4
* Start date: 2023-03-30
----------------------------------------
Dragonfly 6.4.0.

Observed behavior: when I create a HAMMER2 file system on a regular file and try to mount it, I get a panic.
Expected behavior: Maybe the program should exit with an error message? I suspect I'm not supposed to do this kind of thing: the man page of mount_hammer2 says the file should be _special_.

To reproduce, as root:

<pre><code class="shell">
truncate -s 1G hammer2.img
newfs_hammer2 hammer2.img
mkdir mnt
mount_hammer2 ~/hammer2.img mnt
</code></pre>

This is the output after the last command:

<pre>
hammer2_mount: devstr="/root/hammer2.img at DATA"
hammer2_mount: device="/root/hammer2.img" label="DATA" rdonly=0
panic: assertion "strncmp(path, "/dev/", 5) == 0" failed in hammer2_init_devvp a
t /usr/src/sys/vfs/hammer2/hammer2_ondisk.c:197
cpuid = 0
Trace beginning at frame 0xfffff800a9bbac18                                     
hammer2_init_devvp() at hammer2_init_devvp+0x48b 0xffffffff8098589b             
hammer2_init_devvp() at hammer2_init_devvp+0x48b 0xffffffff8098589b             
hammer2_vfs_mount() at hammer2_vfs_mount+0x379 0xffffffff8096a4d9
sys_mount() at sys_mount+0x33b 0xffffffff80702d7b
syscall2() at syscall2+0x11e 0xffffffff80bdc0ae
Debugger("panic")

CPU0 stopping CPUs: 0x00000000
stopped
Stopped at      Debugger+0x7c:  movb    $0,0xbcbd09(%rip)
db>
</pre>




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