7:38 a.m.
I haven't seen anything like this, and I don't see any codepaths that
would allow dirents and num_entries to get out-of-sync. Do you have a
workload to reproduce this? The relevant code is the same on next, so I
should be able to reproduce there.
Daniel
On 11/29/2018 01:22 PM, Malahal Naineni wrote:
The prev_chunk's dirent list is empty although it has num_entries
as
112. Crashes at the following line as the dirents list is empty.
chunk->reload_ck = glist_last_entry(&prev_chunk->dirents,
mdcache_dir_entry_t,
chunk_list)->ck;
#0 0x00007fae938dc4ab in raise () from /lib64/libpthread.so.0
#1 0x000000000045549e in crash_handler (signo=11,
info=0x7fae25f48eb0, ctx=0x7fae25f48d80) at
/usr/src/debug/nfs-ganesha-2.5.3-ibm031.00-0.1.1-Source/MainNFSD/nfs_init.c:225
#2 <signal handler called>
#3 mdcache_get_chunk (parent=0x7faa1001a290,
prev_chunk=0x7fade0206350, whence=2147483647) at
/usr/src/debug/nfs-ganesha-2.5.3-ibm031.00-0.1.1-Source/FSAL/Stackable_FSALs/FSAL_MDCACHE/mdcache_lru.c:909
#4 0x000000000054fbe9 in mdcache_populate_dir_chunk
(directory=0x7faa1001a290, whence=2147483647, dirent=0x7fae25f49680,
prev_chunk=0x7fade0206350, eod_met=0x7fae25f4967f) at
/usr/src/debug/nfs-ganesha-2.5.3-ibm031.00-0.1.1-Source/FSAL/Stackable_FSALs/FSAL_MDCACHE/mdcache_helpers.c:2659
#5 0x0000000000551767 in mdcache_readdir_chunked
(directory=0x7faa1001a290, whence=2147483647,
dir_state=0x7fae25f49990, cb=0x43310f <populate_dirent>, attrmask=0,
eod_met=0x7fae25f49e8b) at
/usr/src/debug/nfs-ganesha-2.5.3-ibm031.00-0.1.1-Source/FSAL/Stackable_FSALs/FSAL_MDCACHE/mdcache_helpers.c:3053
#6 0x000000000053f39f in mdcache_readdir (dir_hdl=0x7faa1001a2c8,
whence=0x7fae25f49970, dir_state=0x7fae25f49990, cb=0x43310f
<populate_dirent>, attrmask=0, eod_met=0x7fae25f49e8b) at
/usr/src/debug/nfs-ganesha-2.5.3-ibm031.00-0.1.1-Source/FSAL/Stackable_FSALs/FSAL_MDCACHE/mdcache_handle.c:639
#7 0x00000000004339f3 in fsal_readdir (directory=0x7faa1001a2c8,
cookie=2147483647, nbfound=0x7fae25f49e8c, eod_met=0x7fae25f49e8b,
attrmask=0, cb=0x495d70 <nfs3_readdir_callback>,
opaque=0x7fae25f49e40) at
/usr/src/debug/nfs-ganesha-2.5.3-ibm031.00-0.1.1-Source/FSAL/fsal_helper.c:1502
#8 0x0000000000495b57 in nfs3_readdir (arg=0x7fa8b4f75e80,
req=0x7fa8b4f75678, res=0x7faad82c8c70) at
/usr/src/debug/nfs-ganesha-2.5.3-ibm031.00-0.1.1-Source/Protocols/NFS/nfs3_readdir.c:289
#9 0x000000000044ccde in nfs_rpc_execute (reqdata=0x7fa8b4f75650) at
/usr/src/debug/nfs-ganesha-2.5.3-ibm031.00-0.1.1-Source/MainNFSD/nfs_worker_thread.c:1290
#10 0x000000000044d4e8 in worker_run (ctx=0x4926600) at
/usr/src/debug/nfs-ganesha-2.5.3-ibm031.00-0.1.1-Source/MainNFSD/nfs_worker_thread.c:1562
#11 0x000000000050c57f in fridgethr_start_routine (arg=0x4926600) at
/usr/src/debug/nfs-ganesha-2.5.3-ibm031.00-0.1.1-Source/support/fridgethr.c:550
(gdb) frame 3
(gdb) p *prev_chunk
$9 = {chunks = {next = 0x7faad808a570, prev = 0x7fade00000d8}, dirents
= {next = 0x7fade0206360, prev = 0x7fade0206360}, parent = 0x0,
chunk_lru = {q = {next = 0x0, prev = 0x0}, qid = LRU_ENTRY_L1, refcnt
= 0, flags = 0, lane = 534, cf = 0}, reload_ck = 1453366958, next_ck =
0, num_entries = 112}
Regards, Malahal.
PS: code frome here:
https://github.com/malahal/nfs-ganesha/commits/ibm2.5 for matching
crash line numbers!
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