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[DragonFlyBSD - Bug #2341] panic: hammer_io_set_modlist: duplicate entry

From: Matthew Dillon via Redmine <bugtracker-admin@xxxxxxxxxxxxxxxxxxxxx>
Date: Fri, 30 Mar 2012 10:18:51 -0700

Issue #2341 has been updated by Matthew Dillon.

File hammer_mvol_01.patch added
Assignee set to Matthew Dillon
% Done changed from 0 to 60

Please try the included patch.  It looks like the red-black tree code was trying to decode a volume number from the hammer_io->offset field but the volume number is not encoded in that field, so the same offset in two different volumes was resulting in a collision.

This patch is untested.

p.s. multi-volume support is not recommended, though other than stupid bugs like this it should work just fine.  The main reason is that it doesn't add any redundancy (HAMMER1 never progressed that far, but the HAMMER2 work in progress this year should be able to achieve ZFS-like redundancy).

Also note that we believe there may be a bug in live-dedup too.  batch dedup run from the hammer utility works fine though.

Bug #2341: panic: hammer_io_set_modlist: duplicate entry 

Author: Mark  Saad
Status: New
Priority: Urgent
Assignee: Matthew Dillon
Target version: 

For the past few days I have been crashing my 3.01 amd64 install of Dragonflybsd with the following crash.

Unread portion of the kernel message buffer:
panic: hammer_io_set_modlist: duplicate entry
cpuid = 1
Trace beginning at frame 0xffffffe09e2b0620
panic() at panic+0x1fb 0xffffffff8049a84d 
panic() at panic+0x1fb 0xffffffff8049a84d 
hammer_io_modify() at hammer_io_modify+0x1ed 0xffffffff8067cc03 
hammer_modify_buffer() at hammer_modify_buffer+0x6b 0xffffffff8067da2e 
hammer_blockmap_alloc() at hammer_blockmap_alloc+0x725 0xffffffff8066a4d7 
hammer_alloc_btree() at hammer_alloc_btree+0x2f 0xffffffff80688ba4 
btree_search() at btree_search+0x166e 0xffffffff80670584 
hammer_btree_lookup() at hammer_btree_lookup+0x107 0xffffffff80670e72 
hammer_ip_sync_record_cursor() at hammer_ip_sync_record_cursor+0x393 0xffffffff80684df7 
hammer_sync_record_callback() at hammer_sync_record_callback+0x230 0xffffffff80678331 
hammer_rec_rb_tree_RB_SCAN() at hammer_rec_rb_tree_RB_SCAN+0xf6 0xffffffff80682e83 
hammer_sync_inode() at hammer_sync_inode+0x28b 0xffffffff80677bd8 
hammer_flusher_flush_inode() at hammer_flusher_flush_inode+0x66 0xffffffff80675305 
hammer_fls_rb_tree_RB_SCAN() at hammer_fls_rb_tree_RB_SCAN+0xf7 0xffffffff80675a53 
hammer_flusher_slave_thread() at hammer_flusher_slave_thread+0x89 0xffffffff80675b45 

CPU1 stopping CPUs: 0x00000001
oops, ran out of processes early!
panic: from debugger
cpuid = 1
boot() called on cpu#1
Uptime: 2h26m4s
Physical memory: 3877 MB
Dumping 1336 MB: 1321 1305 1289 1273 1257 1241 1225 1209 1193 1177 1161 1145 1129 1113 1097 1081 1065 1049 1033 1017 1001 985 969 953 937 921 905 889 873 857 841 825 809 793 777 761 745 729 713 697 681 665 649 633 617 601 585 569 553 537 521 505 489 473 457 441 425 409 393 377 361 345 329 313 297 281 265 249 233 217 201 185 169 153 137 121 105 89 73 57 41 25 9

This box is mirrors.nycbug.org  here are the details on the hardware. This may be a hardware bug but I am not 100% sure

HP DL385 G1
2x AMD Opteron 252 CPUS
HP Smart Array 6i Raid
HP Smart Array 6402 Raid 
2x HP MSA20 arrays attached to the Smart Array 6402

HP SA 6i has 2 disks in a raid 1 with os install using hammer 58GB 5GB in use 
HP SA 6402 has 12 raid 1 sets setup in a giant hammer 2.7TB  248GB in use

The box runs periodic rsync jobs to rsync from  openbsd and dragonflybsd mirrors

This could be a mistake in how i setup the hammer volume on the external storage ( the msa 20's)

Here is what I did to set them up

newfs_hammer -Lexport  -f da1s4:da2s4:da3s4:da5s4:da6s4:da7s4:da8s4:da9s4:da10s4:da11s4:da12s4

then I added this to fstab

/export hammer rw,noatime 2 2

The txt dump is at pastebin http://pastebin.com/G8vPAvHf

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