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Bug #3194

Hammer kernel crash on mirror-stream of PFS after upgrade (assertion "cursor->flags & HAMMER_CURSOR_ITERATE_CHECK" failed in hammer_btree_iterate)

Added by benjolitz 4 months ago. Updated 4 months ago.

Status:
New
Priority:
High
Assignee:
-
Category:
Kernel
Target version:
Start date:
06/28/2019
Due date:
% Done:

0%

Estimated time:

Description

I operate two HAMMER arrays, each with PFSs that are mirrored via ``hammer mirror-stream`` from an array master to an array slave.

I recently upgraded to DragonFly 5.6.

After 18 hours of activity, I encountered a kernel fault that reliably can be provoked by running ``hammer mirror-stream`` on one PFS.

I've disabled PFS mirroring until this can be corrected.

Here is the transcribed error from the kernel fault:

```
panic: assertion "cursor->flags & HAMMER_CURSOR_ITERATE_CHECK" failed in hammer_btree_iterate at /usr/src/sys/vfs/hammer/hammer_btree.c:263
cpuid = 2
Trace beginning at frame 0xfffff801e6875158
hammer_btree_iterate() at hammer_btree_iterate+0x839 0xffffffff80900db9
hammer_btree_iterate() at hammer_btree_iterate+0x839 0xffffffff80900db9
hammer_mirror_delete_to.irsra.2() at hammer_mirror_delete_to.isra.2+0x12 0xffffffff80914d92
hammer_ioc_mirror_write() at hammer_ioc_mirror_write+0x3b7 0xffffffff809159a7
hammer_ioctl() at hammer_ioctl+0xebe 0xffffffff809143de
hammer_vop_ioctl() at hammer_vop_ioctl+0x48 0xffffffff8092d458
Debugger("panic")

CPU2 stopping CPUs: 0x0000000b
stopped
Stopped at Debugger+0x7c: movb $0,0xfc9be9(%rip)
db>
```

Unfortunately, nothing was saved to /var/crash for this fault except an empty ``kern.0`` file.


Files

IMG_0165.HEIC (1.26 MB) IMG_0165.HEIC benjolitz, 06/29/2019 12:55 PM

History

#1

Updated by benjolitz 4 months ago

attached photo of what I transcribed from.

#2

Updated by benjolitz 4 months ago

Addendum: this is really funny, but may be useful in determining what the exact issue is.

I had an error in my init that caused the ``hammer mirror-stream`` for a PFS to be launched *twice*.

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