Nothing directly related to the content lock. However, there have been several use-after-free races fixed, and it's not impossible that trying to interacte with a freed lock will cause a hang. The commits in question are: 11e0e375e40658267cbf449afacaa53a136f7097 eb98f5b855147f44e79fe08dcec8d5057b05ea30 There have been quite a few fixes to readdir since 2.7.6 (and specifically to whence-is-name; I believe your FSAL is a whence-is-name FSAL?) so you might want to look into updating to a newer version. 2.8.4 should come out next week, and 3.3 soon after that. Daniel On 4/23/20 11:17 AM, QR wrote:
Hi Dang, I generate a core dump for this.
It seems something wrong with "entry->content_lock". Is there a known issue for this? Thanks in advance.
Ganesha server info ganesha version: V2.7.6 FSAL : In house nfs client info nfs version : nfs v3 client info : Centos 7.4
======================================================================================================================================================================= (gdb) thread 204 [Switching to thread 204 (Thread 0x7fa7932f2700 (LWP 348))] #0 0x00007faa5ba2cf4d in __lll_lock_wait () from /lib64/libpthread.so.0 (gdb) bt #0 0x00007faa5ba2cf4d in __lll_lock_wait () from /lib64/libpthread.so.0 #1 0x00007faa5ba28d02 in _L_lock_791 () from /lib64/libpthread.so.0 #2 0x00007faa5ba28c08 in pthread_mutex_lock () from /lib64/libpthread.so.0 #3 0x0000000000528657 in _mdcache_lru_unref_chunk (chunk=0x7fa7e03e31d0, func=0x59abd0 <__func__.20247> "mdcache_clean_dirent_chunks", line=579) at /export/jcloud-zbs/src/jd.com/zfs/FSAL_SkyFS/nfs-ganesha/src/FSAL/Stackable_FSALs/FSAL_MDCACHE/mdcache_lru.c:2066 #4 0x000000000053894c in mdcache_clean_dirent_chunks (entry=0x7fa740035400) at /export/jcloud-zbs/src/jd.com/zfs/FSAL_SkyFS/nfs-ganesha/src/FSAL/Stackable_FSALs/FSAL_MDCACHE/mdcache_helpers.c:578 #5 0x0000000000538a30 in mdcache_dirent_invalidate_all (entry=0x7fa740035400) at /export/jcloud-zbs/src/jd.com/zfs/FSAL_SkyFS/nfs-ganesha/src/FSAL/Stackable_FSALs/FSAL_MDCACHE/mdcache_helpers.c:603 #6 0x00000000005376fc in mdc_clean_entry (entry=0x7fa740035400) at /export/jcloud-zbs/src/jd.com/zfs/FSAL_SkyFS/nfs-ganesha/src/FSAL/Stackable_FSALs/FSAL_MDCACHE/mdcache_helpers.c:302 #7 0x0000000000523559 in mdcache_lru_clean (entry=0x7fa740035400) at /export/jcloud-zbs/src/jd.com/zfs/FSAL_SkyFS/nfs-ganesha/src/FSAL/Stackable_FSALs/FSAL_MDCACHE/mdcache_lru.c:592 #8 0x00000000005278b1 in mdcache_lru_get (sub_handle=0x7fa7383cdf40) at /export/jcloud-zbs/src/jd.com/zfs/FSAL_SkyFS/nfs-ganesha/src/FSAL/Stackable_FSALs/FSAL_MDCACHE/mdcache_lru.c:1821 #9 0x0000000000536e91 in _mdcache_alloc_handle (export=0x1b4eed0, sub_handle=0x7fa7383cdf40, fs=0x0, reason=MDC_REASON_DEFAULT, func=0x59ac10 <__func__.20274> "mdcache_new_entry", line=691) at /export/jcloud-zbs/src/jd.com/zfs/FSAL_SkyFS/nfs-ganesha/src/FSAL/Stackable_FSALs/FSAL_MDCACHE/mdcache_helpers.c:174 #10 0x0000000000538c50 in mdcache_new_entry (export=0x1b4eed0, sub_handle=0x7fa7383cdf40, attrs_in=0x7fa7932f00a0, attrs_out=0x7fa7932f0760, new_directory=false, entry=0x7fa7932f0018, state=0x0, reason=MDC_REASON_DEFAULT) at /export/jcloud-zbs/src/jd.com/zfs/FSAL_SkyFS/nfs-ganesha/src/FSAL/Stackable_FSALs/FSAL_MDCACHE/mdcache_helpers.c:690 #11 0x000000000052d156 in mdcache_alloc_and_check_handle (export=0x1b4eed0, sub_handle=0x7fa7383cdf40, new_obj=0x7fa7932f01b0, new_directory=false, attrs_in=0x7fa7932f00a0, attrs_out=0x7fa7932f0760, tag=0x5999a4 "lookup ", parent=0x7fa878288cb0, name=0x7fa738229270 "cer_7_0.5", invalidate=0x7fa7932f009f, state=0x0) at /export/jcloud-zbs/src/jd.com/zfs/FSAL_SkyFS/nfs-ganesha/src/FSAL/Stackable_FSALs/FSAL_MDCACHE/mdcache_handle.c:100 #12 0x000000000053aea1 in mdc_lookup_uncached (mdc_parent=0x7fa878288cb0, name=0x7fa738229270 "cer_7_0.5", new_entry=0x7fa7932f02c8, attrs_out=0x7fa7932f0760) at /export/jcloud-zbs/src/jd.com/zfs/FSAL_SkyFS/nfs-ganesha/src/FSAL/Stackable_FSALs/FSAL_MDCACHE/mdcache_helpers.c:1391 #13 0x000000000053ab27 in mdc_lookup (mdc_parent=0x7fa878288cb0, name=0x7fa738229270 "cer_7_0.5", uncached=true, new_entry=0x7fa7932f02c8, attrs_out=0x7fa7932f0760) at /export/jcloud-zbs/src/jd.com/zfs/FSAL_SkyFS/nfs-ganesha/src/FSAL/Stackable_FSALs/FSAL_MDCACHE/mdcache_helpers.c:1325 #14 0x000000000052d5bb in mdcache_lookup (parent=0x7fa878288ce8, name=0x7fa738229270 "cer_7_0.5", handle=0x7fa7932f0878, attrs_out=0x7fa7932f0760) at /export/jcloud-zbs/src/jd.com/zfs/FSAL_SkyFS/nfs-ganesha/src/FSAL/Stackable_FSALs/FSAL_MDCACHE/mdcache_handle.c:181 #15 0x0000000000431a60 in fsal_lookup (parent=0x7fa878288ce8, name=0x7fa738229270 "cer_7_0.5", obj=0x7fa7932f0878, attrs_out=0x7fa7932f0760) at /export/jcloud-zbs/src/jd.com/zfs/FSAL_SkyFS/nfs-ganesha/src/FSAL/fsal_helper.c:683 #16 0x000000000048e83e in nfs3_lookup (arg=0x7fa7381bdc88, req=0x7fa7381bd580, res=0x7fa73839dab0) at /export/jcloud-zbs/src/jd.com/zfs/FSAL_SkyFS/nfs-ganesha/src/Protocols/NFS/nfs3_lookup.c:104 #17 0x000000000045703b in nfs_rpc_process_request (reqdata=0x7fa7381bd580) at /export/jcloud-zbs/src/jd.com/zfs/FSAL_SkyFS/nfs-ganesha/src/MainNFSD/nfs_worker_thread.c:1329 #18 0x000000000045781f in nfs_rpc_process_request_slowio (reqdata=0x7fa7381bd580, slowio_check_cb=0x553b4a <nfs3_timeout_proc>) at /export/jcloud-zbs/src/jd.com/zfs/FSAL_SkyFS/nfs-ganesha/src/MainNFSD/nfs_worker_thread.c:1542 #19 0x0000000000457955 in nfs_rpc_valid_NFS (req=0x7fa7381bd580) at /export/jcloud-zbs/src/jd.com/zfs/FSAL_SkyFS/nfs-ganesha/src/MainNFSD/nfs_worker_thread.c:1586 #20 0x00007faa5c901435 in svc_vc_decode (req=0x7fa7381bd580) at /export/jcloud-zbs/src/jd.com/zfs/FSAL_SkyFS/nfs-ganesha/src/libntirpc/src/svc_vc.c:829 #21 0x000000000044a497 in nfs_rpc_decode_request (xprt=0x7fa8840027d0, xdrs=0x7fa7384befa0) at /export/jcloud-zbs/src/jd.com/zfs/FSAL_SkyFS/nfs-ganesha/src/MainNFSD/nfs_rpc_dispatcher_thread.c:1345 #22 0x00007faa5c901346 in svc_vc_recv (xprt=0x7fa8840027d0) at /export/jcloud-zbs/src/jd.com/zfs/FSAL_SkyFS/nfs-ganesha/src/libntirpc/src/svc_vc.c:802 #23 0x00007faa5c8fda92 in svc_rqst_xprt_task (wpe=0x7fa8840029e8) at /export/jcloud-zbs/src/jd.com/zfs/FSAL_SkyFS/nfs-ganesha/src/libntirpc/src/svc_rqst.c:769 #24 0x00007faa5c8fdeea in svc_rqst_epoll_events (sr_rec=0x1b62c60, n_events=1) at /export/jcloud-zbs/src/jd.com/zfs/FSAL_SkyFS/nfs-ganesha/src/libntirpc/src/svc_rqst.c:941 #25 0x00007faa5c8fe17f in svc_rqst_epoll_loop (sr_rec=0x1b62c60) at /export/jcloud-zbs/src/jd.com/zfs/FSAL_SkyFS/nfs-ganesha/src/libntirpc/src/svc_rqst.c:1014 #26 0x00007faa5c8fe232 in svc_rqst_run_task (wpe=0x1b62c60) at /export/jcloud-zbs/src/jd.com/zfs/FSAL_SkyFS/nfs-ganesha/src/libntirpc/src/svc_rqst.c:1050 #27 0x00007faa5c906dbb in work_pool_thread (arg=0x7fa7540008c0) at /export/jcloud-zbs/src/jd.com/zfs/FSAL_SkyFS/nfs-ganesha/src/libntirpc/src/work_pool.c:181 #28 0x00007faa5ba26dc5 in start_thread () from /lib64/libpthread.so.0 #29 0x00007faa5b33321d in clone () from /lib64/libc.so.6 (gdb) frame 3 #3 0x0000000000528657 in _mdcache_lru_unref_chunk (chunk=0x7fa7e03e31d0, func=0x59abd0 <__func__.20247> "mdcache_clean_dirent_chunks", line=579) at /export/jcloud-zbs/src/jd.com/zfs/FSAL_SkyFS/nfs-ganesha/src/FSAL/Stackable_FSALs/FSAL_MDCACHE/mdcache_lru.c:2066 2066in /export/jcloud-zbs/src/jd.com/zfs/FSAL_SkyFS/nfs-ganesha/src/FSAL/Stackable_FSALs/FSAL_MDCACHE/mdcache_lru.c (gdb) p qlane->mtx $42 = {__data = {__lock = 2, __count = 0, *__owner = 225*, __nusers = 1, __kind = 0, __spins = 0, __elision = 0, __list = {__prev = 0x0, __next = 0x0}}, __size = "\002\000\000\000\000\000\000\000\341\000\000\000\001", '\000' <repeats 26 times>, __align = 2} ======================================================================================================================================================================= (gdb) info threads 84 Thread 0x7fa9a68e8700 (LWP 228) 0x00007faa5ba2a03e in pthread_rwlock_wrlock () from /lib64/libpthread.so.0 83 Thread 0x7fa9a69e9700 (LWP 227) 0x00007faa5ba29e24 in pthread_rwlock_rdlock () from /lib64/libpthread.so.0 *82 Thread 0x7fa9a6aea700 (LWP 225)* 0x00007faa5ba2cf4d in __lll_lock_wait () from /lib64/libpthread.so.0 81 Thread 0x7fa9a6beb700 (LWP 226) 0x00007faa5ba2a03e in pthread_rwlock_wrlock () from /lib64/libpthread.so.0 80 Thread 0x7fa9a6cec700 (LWP 224) 0x00007faa5ba2a03e in pthread_rwlock_wrlock () from /lib64/libpthread.so.0 79 Thread 0x7fa9a6ded700 (LWP 223) 0x00007faa5ba29e24 in pthread_rwlock_rdlock () from /lib64/libpthread.so.0 78 Thread 0x7fa9a6eee700 (LWP 222) 0x00007faa5ba2a03e in pthread_rwlock_wrlock () from /lib64/libpthread.so.0 77 Thread 0x7fa9a6fef700 (LWP 221) 0x00007faa5ba29e24 in pthread_rwlock_rdlock () from /lib64/libpthread.so.0 76 Thread 0x7fa9a70f0700 (LWP 220) 0x00007faa5ba2a03e in pthread_rwlock_wrlock () from /lib64/libpthread.so.0 75 Thread 0x7fa9a71f1700 (LWP 219) 0x00007faa5ba2a03e in pthread_rwlock_wrlock () from /lib64/libpthread.so.0 74 Thread 0x7fa9a72f2700 (LWP 218) 0x00007faa5ba29e24 in pthread_rwlock_rdlock () from /lib64/libpthread.so.0 73 Thread 0x7fa9a73f3700 (LWP 217) 0x00007faa5ba2a03e in pthread_rwlock_wrlock () from /lib64/libpthread.so.0 ======================================================================================================================================================================= (gdb) *thread 82* [Switching to thread 82 (Thread 0x7fa9a6aea700 (LWP 225))] #0 0x00007faa5ba2cf4d in __lll_lock_wait () from /lib64/libpthread.so.0 (gdb) bt #0 0x00007faa5ba2cf4d in __lll_lock_wait () from /lib64/libpthread.so.0 #1 0x00007faa5ba2a307 in _L_lock_14 () from /lib64/libpthread.so.0 #2 0x00007faa5ba2a2b3 in pthread_rwlock_trywrlock () from /lib64/libpthread.so.0 #3 0x0000000000524547 in *lru_reap_chunk_impl* (qid=LRU_ENTRY_L2, parent=0x7fa7f8122810) at /export/jcloud-zbs/src/jd.com/zfs/FSAL_SkyFS/nfs-ganesha/src/FSAL/Stackable_FSALs/FSAL_MDCACHE/mdcache_lru.c:809 #4 0x0000000000524a01 in mdcache_get_chunk (parent=0x7fa7f8122810, prev_chunk=0x0, whence=0) at /export/jcloud-zbs/src/jd.com/zfs/FSAL_SkyFS/nfs-ganesha/src/FSAL/Stackable_FSALs/FSAL_MDCACHE/mdcache_lru.c:886 #5 0x000000000053f0b6 in mdcache_populate_dir_chunk (directory=0x7fa7f8122810, whence=0, dirent=0x7fa9a6ae7f80, prev_chunk=0x0, eod_met=0x7fa9a6ae7f7f) at /export/jcloud-zbs/src/jd.com/zfs/FSAL_SkyFS/nfs-ganesha/src/FSAL/Stackable_FSALs/FSAL_MDCACHE/mdcache_helpers.c:2554 #6 0x0000000000540aff in mdcache_readdir_chunked (directory=0x7fa7f8122810, whence=0, dir_state=0x7fa9a6ae8130, cb=0x43215e <populate_dirent>, attrmask=122830, eod_met=0x7fa9a6ae884b) at /export/jcloud-zbs/src/jd.com/zfs/FSAL_SkyFS/nfs-ganesha/src/FSAL/Stackable_FSALs/FSAL_MDCACHE/mdcache_helpers.c:2991 #7 0x000000000052ee71 in mdcache_readdir (dir_hdl=0x7fa7f8122848, whence=0x7fa9a6ae8110, dir_state=0x7fa9a6ae8130, cb=0x43215e <populate_dirent>, attrmask=122830, eod_met=0x7fa9a6ae884b) at /export/jcloud-zbs/src/jd.com/zfs/FSAL_SkyFS/nfs-ganesha/src/FSAL/Stackable_FSALs/FSAL_MDCACHE/mdcache_handle.c:559 #8 0x0000000000432a85 in fsal_readdir (directory=0x7fa7f8122848, cookie=0, nbfound=0x7fa9a6ae884c, eod_met=0x7fa9a6ae884b, attrmask=122830, cb=0x491b0f <nfs3_readdirplus_callback>, opaque=0x7fa9a6ae8800) at /export/jcloud-zbs/src/jd.com/zfs/FSAL_SkyFS/nfs-ganesha/src/FSAL/fsal_helper.c:1164 #9 0x0000000000491968 in nfs3_readdirplus (arg=0x7fa91470b9f8, req=0x7fa91470b2f0, res=0x7fa91407b8f0) at /export/jcloud-zbs/src/jd.com/zfs/FSAL_SkyFS/nfs-ganesha/src/Protocols/NFS/nfs3_readdirplus.c:310 #10 0x000000000045703b in nfs_rpc_process_request (reqdata=0x7fa91470b2f0) at /export/jcloud-zbs/src/jd.com/zfs/FSAL_SkyFS/nfs-ganesha/src/MainNFSD/nfs_worker_thread.c:1329 #11 0x000000000045781f in nfs_rpc_process_request_slowio (reqdata=0x7fa91470b2f0, slowio_check_cb=0x553b4a <nfs3_timeout_proc>) at /export/jcloud-zbs/src/jd.com/zfs/FSAL_SkyFS/nfs-ganesha/src/MainNFSD/nfs_worker_thread.c:1542 #12 0x0000000000457955 in nfs_rpc_valid_NFS (req=0x7fa91470b2f0) at /export/jcloud-zbs/src/jd.com/zfs/FSAL_SkyFS/nfs-ganesha/src/MainNFSD/nfs_worker_thread.c:1586 #13 0x00007faa5c901435 in svc_vc_decode (req=0x7fa91470b2f0) at /export/jcloud-zbs/src/jd.com/zfs/FSAL_SkyFS/nfs-ganesha/src/libntirpc/src/svc_vc.c:829 #14 0x000000000044a497 in nfs_rpc_decode_request (xprt=0x7fa8840027d0, xdrs=0x7fa9142a1370) at /export/jcloud-zbs/src/jd.com/zfs/FSAL_SkyFS/nfs-ganesha/src/MainNFSD/nfs_rpc_dispatcher_thread.c:1345 #15 0x00007faa5c901346 in svc_vc_recv (xprt=0x7fa8840027d0) at /export/jcloud-zbs/src/jd.com/zfs/FSAL_SkyFS/nfs-ganesha/src/libntirpc/src/svc_vc.c:802 #16 0x00007faa5c8fda92 in svc_rqst_xprt_task (wpe=0x7fa8840029e8) at /export/jcloud-zbs/src/jd.com/zfs/FSAL_SkyFS/nfs-ganesha/src/libntirpc/src/svc_rqst.c:769 #17 0x00007faa5c8fdeea in svc_rqst_epoll_events (sr_rec=0x1b62c60, n_events=1) at /export/jcloud-zbs/src/jd.com/zfs/FSAL_SkyFS/nfs-ganesha/src/libntirpc/src/svc_rqst.c:941 #18 0x00007faa5c8fe17f in svc_rqst_epoll_loop (sr_rec=0x1b62c60) at /export/jcloud-zbs/src/jd.com/zfs/FSAL_SkyFS/nfs-ganesha/src/libntirpc/src/svc_rqst.c:1014 #19 0x00007faa5c8fe232 in svc_rqst_run_task (wpe=0x1b62c60) at /export/jcloud-zbs/src/jd.com/zfs/FSAL_SkyFS/nfs-ganesha/src/libntirpc/src/svc_rqst.c:1050 #20 0x00007faa5c906dbb in work_pool_thread (arg=0x7fa9380008c0) at /export/jcloud-zbs/src/jd.com/zfs/FSAL_SkyFS/nfs-ganesha/src/libntirpc/src/work_pool.c:181 #21 0x00007faa5ba26dc5 in start_thread () from /lib64/libpthread.so.0 #22 0x00007faa5b33321d in clone () from /lib64/libc.so.6 (gdb) frame 3 #3 0x0000000000524547 in lru_reap_chunk_impl (qid=LRU_ENTRY_L2, parent=0x7fa7f8122810) at /export/jcloud-zbs/src/jd.com/zfs/FSAL_SkyFS/nfs-ganesha/src/FSAL/Stackable_FSALs/FSAL_MDCACHE/mdcache_lru.c:809 809in /export/jcloud-zbs/src/jd.com/zfs/FSAL_SkyFS/nfs-ganesha/src/FSAL/Stackable_FSALs/FSAL_MDCACHE/mdcache_lru.c (gdb) p entry->content_lock $43 = {__data = {__lock = 2, __nr_readers = *32681*, __readers_wakeup = 0, __writer_wakeup = 0, __nr_readers_queued = 0, __nr_writers_queued = 0, __writer = -598294472, __shared = 32680, __pad1 = 140366914447067, __pad2 = 0, __flags = 0}, __size = "\002\000\000\000\251\177", '\000' <repeats 18 times>, "\070\300V\334\250\177\000\000\333\346\022\270\251\177", '\000' <repeats 17 times>, __align = 140363826200578} =======================================================================================================================================================================
--------------------------------
----- 原始邮件 ----- 发件人："QR" <zhbingyin@sina.com> 收件人："Daniel Gryniewicz" <dgryniew@redhat.com>, "ganesha-devel" <devel@lists.nfs-ganesha.org>, 主题：[NFS-Ganesha-Devel]回复：Re:_ganesha_hang_more_than_five_hours 日期：2020年02月26日 18点21分
Not yet. Because the docker did not enable core dump.
Will try to create a full backtrace for this, thanks.
--------------------------------
----- 原始邮件 ----- 发件人：Daniel Gryniewicz <dgryniew@redhat.com> 收件人：devel@lists.nfs-ganesha.org 主题：[NFS-Ganesha-Devel] Re: ganesha hang more than five hours 日期：2020年02月25日 21点20分
No, definitely not a known issue. Do you have a full backtrace of one (or several, if they're different) hung threads? Daniel On 2/24/20 9:28 PM, QR wrote:
Hi Dang,
Ganesha hangs more than five hours. It seems that 198 svc threads hang on nfs3_readdirplus. Is there a known issue about this? Thanks in advance.
Ganesha server info ganesha version: V2.7.6 FSAL : In house nfs client info nfs version : nfs v3 client info : CentOS 7.4
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