Hi Wendy,
thanks for your answer!
The system is still in the deadlock state, so I hopefully can collect all
information you need :-) (you'll find the crash output below)
Thanks,
Mark
> > we have the following deadlock situation:
> >
> > 2 node cluster consisting of node1 and node2.
> > /usr/local is placed on a GFS filesystem mounted on both nodes.
> > Lockmanager is dlm.
> > We are using RHEL4u4
> >
> > a strace to ls -l /usr/local/swadmin/mnx/xml ends up in
> > lstat("/usr/local/swadmin/mnx/xml",
> >
> > This happens on both cluster nodes.
> >
> > All processes trying to access the directory /usr/local/swadmin/mnx/xml
> > are in "Waiting for IO (D)" state. I.e. system load is at about 400 ;-)
> >
> > Any ideas ?
>
> Quickly browsing this, look to me that process with pid=5856 got stuck.
> That process had the file or directory (ino number 627732 - probably
> /usr/local/swadmin/mnx/xml) exclusive lock so everyone was waiting for
> it. The faulty process was apparently in the middle of obtaining another
> exclusive lock (and almost got it). We need to know where pid=5856 was
> stuck at that time. If this occurs again, could you use "crash" to back
> trace that process and show us the output ?
Here's the crash output:
crash> bt 5856
PID: 5856 TASK: 10bd26427f0 CPU: 0 COMMAND: "java"
#0 [10bd20cfbc8] schedule at ffffffff8030a1d1
#1 [10bd20cfca0] wait_for_completion at ffffffff8030a415
#2 [10bd20cfd20] glock_wait_internal at ffffffffa018574e
#3 [10bd20cfd60] gfs_glock_nq_m at ffffffffa01860ce
#4 [10bd20cfda0] gfs_unlink at ffffffffa019ce41
#5 [10bd20cfea0] vfs_unlink at ffffffff801889fa
#6 [10bd20cfed0] sys_unlink at ffffffff80188b19
#7 [10bd20cff30] filp_close at ffffffff80178e48
#8 [10bd20cff50] error_exit at ffffffff80110d91
RIP: 0000002a9593f649 RSP: 0000007fbfffbca0 RFLAGS: 00010206
RAX: 0000000000000057 RBX: ffffffff8011026a RCX: 0000002a9cc9c870
RDX: 0000002ae5989000 RSI: 0000002a962fa3a8 RDI: 0000002ae5989000
RBP: 0000000000000000 R8: 0000002a9630abb0 R9: 0000000000000ffc
R10: 0000002a9630abc0 R11: 0000000000000206 R12: 0000000040115700
R13: 0000002ae23294b0 R14: 0000007fbfffc300 R15: 0000002ae5989000
ORIG_RAX: 0000000000000057 CS: 0033 SS: 002b
> > a lockdump analysis with the decipher_lockstate_dump and parse_lockdump
> > shows the following output (The whole file is too large for the
> > mailing-list):
> >
> > Entries: 101939
> > Glocks: 60112
> > PIDs: 751
> >
> > 4 chain:
> > lockdump.node1.dec Glock (inode[2], 1114343)
> > gl_flags = lock[1]
> > gl_count = 5
> > gl_state = shared[3]
> > req_gh = yes
> > req_bh = yes
> > lvb_count = 0
> > object = yes
> > new_le = no
> > incore_le = no
> > reclaim = no
> > aspace = 1
> > ail_bufs = no
> > Request
> > owner = 5856
> > gh_state = exclusive[1]
> > gh_flags = try[0] local_excl[5] async[6]
> > error = 0
> > gh_iflags = promote[1]
> > Waiter3
> > owner = 5856
> > gh_state = exclusive[1]
> > gh_flags = try[0] local_excl[5] async[6]
> > error = 0
> > gh_iflags = promote[1]
> > Inode: busy
> > lockdump.node2.dec Glock (inode[2], 1114343)
> > gl_flags =
> > gl_count = 2
> > gl_state = unlocked[0]
> > req_gh = no
> > req_bh = no
> > lvb_count = 0
> > object = yes
> > new_le = no
> > incore_le = no
> > reclaim = no
> > aspace = 0
> > ail_bufs = no
> > Inode:
> > num = 1114343/1114343
> > type = regular[1]
> > i_count = 1
> > i_flags =
> > vnode = yes
> > lockdump.node1.dec Glock (inode[2], 627732)
> > gl_flags = dirty[5]
> > gl_count = 379
> > gl_state = exclusive[1]
> > req_gh = no
> > req_bh = no
> > lvb_count = 0
> > object = yes
> > new_le = no
> > incore_le = no
> > reclaim = no
> > aspace = 58
> > ail_bufs = no
> > Holder
> > owner = 5856
> > gh_state = exclusive[1]
> > gh_flags = try[0] local_excl[5] async[6]
> > error = 0
> > gh_iflags = promote[1] holder[6] first[7]
> > Waiter2
> > owner = none[-1]
> > gh_state = shared[3]
> > gh_flags = try[0]
> > error = 0
> > gh_iflags = demote[2] alloced[4] dealloc[5]
> > Waiter3
> > owner = 32753
> > gh_state = shared[3]
> > gh_flags = any[3]
> > error = 0
> > gh_iflags = promote[1]
> > [...loads of Waiter3 entries...]
> > Waiter3
> > owner = 4566
> > gh_state = shared[3]
> > gh_flags = any[3]
> > error = 0
> > gh_iflags = promote[1]
> > Inode: busy
> > lockdump.node2.dec Glock (inode[2], 627732)
> > gl_flags = lock[1]
> > gl_count = 375
> > gl_state = unlocked[0]
> > req_gh = yes
> > req_bh = yes
> > lvb_count = 0
> > object = yes
> > new_le = no
> > incore_le = no
> > reclaim = no
> > aspace = 0
> > ail_bufs = no
> > Request
> > owner = 20187
> > gh_state = shared[3]
> > gh_flags = any[3]
> > error = 0
> > gh_iflags = promote[1]
> > Waiter3
> > owner = 20187
> > gh_state = shared[3]
> > gh_flags = any[3]
> > error = 0
> > gh_iflags = promote[1]
> > [...loads of Waiter3 entries...]
> > Waiter3
> > owner = 10460
> > gh_state = shared[3]
> > gh_flags = any[3]
> > error = 0
> > gh_iflags = promote[1]
> > Inode: busy
> > 2 requests
>
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Gruss / Regards,
Mark Hlawatschek
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