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Bug #3348

closed

Panic when trying to mount_hammer2 a file

Added by zabolekar over 2 years ago. Updated 17 days ago.

Status:
Resolved
Priority:
Normal
Assignee:
tkusumi
Category:
VFS subsystem
Target version:
6.4
Start date:
03/30/2023
Due date:
% Done:

100%

Estimated time:

Description

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:

truncate -s 1G hammer2.img
newfs_hammer2 hammer2.img
mkdir mnt
mount_hammer2 ~/hammer2.img mnt

This is the output after the last command:

hammer2_mount: devstr="/root/hammer2.img@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>
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 #1

Updated by liweitianux 17 days ago

  • 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:

# mount_hammer2 ./hammer2.img /mnt
mount_hammer2: /dev/./hammer2.img@DATA not found

With dmesg showed messages:

hammer2_mount: devstr="/dev/./hammer2.img@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

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