strtst fails with LiS-2.18 and MontaVista CGE 3.1 (band_test and fifo_test)

"Longhi Stefano" <[email protected]>
Newsgroups gmane.linux.kernel.streams
Message-ID <[email protected]> 
Hello,
I'm running LiS-2.18 compiled against MontaVista CGE 3.1 and have some
problems.
 
1) To make LiS compile with MVCGE, I had to include <linux/namei.h> in
linux-mdep.c (undefined struct nameidata) and redefine
EXPORT_SYMBOL_NOVERS in exports.c because otherwise I had a parse error
before "this_object_must_be_defined_as_export_objs_in_the_Makefile". 
I suppose something is not correctly defined in my configuration, but I
cannot fint what. It seems that this error appears when EXPORT_SYMTAB is
not defined, even though EXPORT_SYMTAB is defined at the beginning of
exports.c. Anyway, with my corrections, streams module loads and
exported symbols are shown with ksyms, but I wonder if my changes are
correct.
 
2) strtst sometimes fails during the Queue band test (about 50% of
strtst runs).
To test different configurations, since MontaVista CGE 3.1 is based on
2.4.20 kernel, I compiled LiS and run strtst with 2.4.20 kernel
downloaded from kernel.org and everything went fine, but with
2.4.20-20.9 kernel provided with RedHat 9.B I have the same problems and
Queue band test fails (note that I used the same .config file to compile
both kernels), therefore it seems it is not only a problem related to
MVCGE environment.
Searching in the mail archive I found similar problem descriptions and I
tried to verify whether the failure is related to a delay problem.
So, I commented out the set_debug_mask(0x00000000L) instructions in the
band_test function (the receive_band(2): seq=31024 Bad message always
happens soon after that instruction) and I had no more failures. 
My question is: is the band_test failure only due to delays that are
introduced to log debug information? is it related only with strtst
execution or could I have problems whith my modules that use streams?
In spite of my change to band_test I had the problem described at point
3). (I run a script that executes a loop of strtst).
 
3) running strtst I have sporadic Oops during FIFO/pipe test: 
after strtst starts, fifo_test: open("/dev/fifo.0",O_RDWR) #1: fd 4 mode
020666 dev 0xe85f 
I have: 
  lis_qopen(q@0xc491b584 <mailto:q@0xc491b584> ,...) calling module
"fifo" open @0xd0861360 (dev=e80005f,flag=2,sflag=1)
  Unable to handle kernel paging request at virtual address 0000ee20
After that, strtst hangs and I have to reboot to use streams again.
 
In attachment there are traces related to problems 2) and 3).
Anyone who can help me is welcome!
Many thanks,
    Stefano
band_test_failure.txt (text/plain, 11 KB) 
*** strtst output ****

Queue band test

band_test: band 0 (easy case)
ck_band(0): I_CKBAND: got expected result 1
receive_band: OK: Seq=1 Band=0 M_DATA
ck_band(0): I_CKBAND: got expected result 0

band_test: write band 0, 1; read band 1, 0
ck_band(1): I_CKBAND: got expected result 1
receive_band: OK: Seq=3 Band=1 M_DATA
ck_band(1): I_CKBAND: got expected result 0
receive_band: OK: Seq=2 Band=0 M_DATA

band_test: write band 1, 2, 3; read band 3, 2, 1
ck_band(3): I_CKBAND: got expected result 1
receive_band: OK: Seq=6 Band=3 M_DATA
ck_band(3): I_CKBAND: got expected result 0
ck_band(2): I_CKBAND: got expected result 1
receive_band: OK: Seq=5 Band=2 M_DATA
ck_band(2): I_CKBAND: got expected result 0
ck_band(1): I_CKBAND: got expected result 1
receive_band: OK: Seq=4 Band=1 M_DATA
ck_band(1): I_CKBAND: got expected result 0

band_test: write band 1, 3; read band 3, 1
receive_band: OK: Seq=8 Band=3 M_DATA
receive_band: OK: Seq=7 Band=1 M_DATA

band_test: write band 1, 3, 1; read band 3, 1, 1
receive_band: OK: Seq=10 Band=3 M_DATA
receive_band: OK: Seq=9 Band=1 M_DATA
receive_band: OK: Seq=11 Band=1 M_DATA

band_test: write band 1, 2, M_PCPROTO; read M_PCPROTO, band 2, 1
receive_band: OK: Seq=14 Band=0 M_PCPROTO
receive_band: OK: Seq=13 Band=2 M_DATA
receive_band: OK: Seq=12 Band=1 M_DATA

band_test: fill up band 1, then write band 2; read 2, 1, 1, ...

STREAMS debug mask set to 0x0000000000000000

band_test: band 1 full (1577 msgs), write band 2

STREAMS debug mask set to 0xffffffffffffffff
   1417 messages available to read
receive_band: OK: Seq=11578 Band=2 M_DATA
receive_band: OK: Seq=10000 Band=1 M_DATA

STREAMS debug mask set to 0x0000000000000000

band_test: wr band 1, fill band 2, wr band 1; read 2,2,... 1

STREAMS debug mask set to 0xffffffffffffffff

STREAMS debug mask set to 0x0000000000000000

band_test: band 2 full (10347 msgs), write band 1
   6966 messages available to read
receive_band: OK: Seq=20000 Band=2 M_DATA

STREAMS debug mask set to 0x0000000000000000
receive_band(2): seq=30186 Bad message



****************************************************
*                  Test Failed                     *
****************************************************


*** /var/log/messages ***
 .....
 lis_head_put(h@0xc49d0d40/--1/1) "loop(234,2)" {head.c@0}
 lis_head_get(h@0xc49d06c0/++2/1) "printk(236,0)" {head.c@0}
 lis_kmem_cache_allochdr: allocated c29b7e2c
 lis_allocb: mp=0xc29b7e2c dp=0xc29b7e50(intl) from mblk /root/LIS/LiS-2.18_mvlcge31-preeemptive/head/head.c 5138
             rptr=0xc29b7e6c wptr=0xc29b7e6c size=50
 strwrite: stream printk(236,0): send 50 bytes downstream to printk
 putnext: M_DATA from "str_wput" to "printk" size 64
         q=c5b5a9e0, mp=c29b7e2c, mp->b_rptr=c29b7e6c, wptr=c29b7e9e
 strtst: receive_band: OK: Seq=10000 Band=1 M_DATA
 lis_freeb: (mblk) bp=0xc29b7e2c dp=0xc29b7e50
 lis_msgb_cache_freehdr: freed c29b7e2c
 lis_head_put(h@0xc49d06c0/--1/1) "printk(236,0)" {head.c@0}
 lis_dget: d@0xc5c1f220/2 m:4 i@0xc720ad40/1 "loop.1"
 >> parent: d@0xcfbf8138/223 m:4 i@0xcfbf7d80/1 "dev"
 >> parent: d@0xc13daf24/108 m:4 i@0xcfbf78c0/1 "/"
 lis_stropen(i@0xc720ad40/1,f@0xc8f60184/1)#259
     << i_rdev=(234,1) f_mode=03 f_flags=0x2 <[4] 4 LiS inode(s), 3 open stream(s)>
     << d@0xc5c1f220/1 m@0xcffef3ac/1231
 lis_show_inode_aliases(i@0xc720ad40/1.1#40063):
 >> dentry: d@0xc5c1f220/2 m:4 i@0xc720ad40/1 "loop.1"
 >> parent: d@0xcfbf8138/223 m:4 i@0xcfbf7d80/1 "dev"
 >> parent: d@0xc13daf24/108 m:4 i@0xcfbf78c0/1 "/"
 lis_lookup_stdata(d0xea00001,d@0xc5c1f220/2,h@0x00000000/0/0) <same>
     >> h@0xc49d0040/1/1 i@0xc343c2c0/1
 lis_head_get(h@0xc49d0040/++2/1) "loop(234,1)" {head.c@0}
 lis_qopen(q@0xc5b5aac4,...) calling driver "loop" open @0xd0861920 (dev=ea00001,flag=2,sflag=0)
 lis_cleanup_file_opening(f@0xc8f60184/1,h@0xc49d0040/2/1,0)
  "/dev/loop.1"
 >> dentry: d@0xc5c1f220/2 m:4 i@0xc720ad40/1 "loop.1"
 >> parent: d@0xcfbf8138/223 m:4 i@0xcfbf7d80/1 "dev"
 >> parent: d@0xc13daf24/108 m:4 i@0xcfbf78c0/1 "/"
 lis_dput: d@0xc5c1f220/2 m:4 i@0xc720ad40/1 "loop.1"
 >> parent: d@0xcfbf8138/223 m:4 i@0xcfbf7d80/1 "dev"
 >> parent: d@0xc13daf24/108 m:4 i@0xcfbf78c0/1 "/"
 lis_stropen(i@0xc720ad40/1,f@0xc8f60184/1)#259
     >> h@0xc49d0040/2/2 "loop(234,1)" i@0xc720ad40/1 rq@0xc5b5ac84 wq@0xc5b5ad60
     >> d@0xc5c1f220/1 m@0xcffef3ac/1231
 lis_show_inode_aliases(i@0xc720ad40/1.1#40063):
 >> dentry: d@0xc5c1f220/1 m:4 i@0xc720ad40/1 "loop.1"
 >> parent: d@0xcfbf8138/223 m:4 i@0xcfbf7d80/1 "dev"
 >> parent: d@0xc13daf24/108 m:4 i@0xcfbf78c0/1 "/"
 STREAM "loop(234,1)":  str_wput<==>loop
 lis_stropen(i@0xc720ad40/1,f@0xc8f60184/1)#259 done OK...
     >> <[4] 4 LiS inode(s), 3 open stream(s)>
 lis_head_get(h@0xc49d0040/++3/2) "loop(234,1)" {head.c@0}
 lis_head_put(h@0xc49d0040/--2/2) "loop(234,1)" {head.c@0}
 lis_strioctl(i@0xc720ad40/1,f@0xc8f60184/2,cmd=0x53ff,arg=0x0) << i_rdev=0xea00001
 lis_head_get(h@0xc49d0040/++3/2) "loop(234,1)" {head.c@0}
 lis_head_put(h@0xc49d0040/--2/2) "loop(234,1)" {head.c@0}
 lis_head_get(h@0xc49d0040/++3/2) "loop(234,1)" {head.c@0}
 strtst:
 STREAMS debug mask set to 0x0000000000000000
 strtst:
 band_test: wr band 1, fill band 2, wr band 1; read 2,2,... 1
 lis_head_put(h@0xc49d0040/--2/2) "loop(234,1)" {head.c@0}
 lis_strioctl(i@0xc720ad40/1,f@0xc8f60184/2,cmd=0x53f1,arg=0xffffffff) << i_rdev=0xea00001
 lis_head_get(h@0xc49d0040/++3/2) "loop(234,1)" {head.c@0}
 lis_head_put(h@0xc49d0040/--2/2) "loop(234,1)" {head.c@0}
 lis_head_get(h@0xc49d06c0/++2/1) "printk(236,0)" {head.c@0}
 lis_kmem_cache_allochdr: allocated c29caafc
 lis_allocb: mp=0xc29caafc dp=0xc29cab20(intl) from mblk /root/LIS/LiS-2.18_mvlcge31-preeemptive/head/head.c 5138
             rptr=0xc29cab3c wptr=0xc29cab3c size=54
 strwrite: stream printk(236,0): send 54 bytes downstream to printk
 putnext: M_DATA from "str_wput" to "printk" size 64
         q=c5b5a9e0, mp=c29caafc, mp->b_rptr=c29cab3c, wptr=c29cab72
 strtst:
 STREAMS debug mask set to 0xffffffffffffffff
 lis_freeb: (mblk) bp=0xc29caafc dp=0xc29cab20
 lis_msgb_cache_freehdr: freed c29caafc
 lis_head_put(h@0xc49d06c0/--1/1) "printk(236,0)" {head.c@0}
 lis_strclose(i@0xc720ad40/1,f@0xc8f60184/0)#249 i_rdev=(234,1)
     << d@0xc5c1f220/1 <[4] 4 LiS inode(s), 3 open stream(s)>
 lis_doclose(i@0xc720ad40/1,f@0xc8f60184/0,h@0xc49d0040/2/2.0,...)#269/249
     << "loop(234,1)" d@0xc5c1f220/1 <[4] 4 LiS inode(s), 3 open stream(s)>
 STREAM "loop(234,1)":  str_wput<==>loop
 lis_cleanup_file_closing(f@0xc8f60184/0,h@0xc49d0040/2/1) [4] "/dev/loop.1"
 >> dentry: d@0xc5c1f220/1 m:4 i@0xc720ad40/1 "loop.1"
 >> parent: d@0xcfbf8138/223 m:4 i@0xcfbf7d80/1 "dev"
 >> parent: d@0xc13daf24/108 m:4 i@0xcfbf78c0/1 "/"
 lis_head_put(h@0xc49d0040/--1/1) "loop(234,1)" {head.c@0}
 lis_doclose(...)#269/249 >> <[4] 4 LiS inode(s), 3 open stream(s)>
 lis_head_get(h@0xc49d0040/++2/1) "loop(234,1)" {head.c@0}
 lis_kmem_cache_allochdr: allocated c29caafc
 lis_allocb: mp=0xc29caafc dp=0xc29cab20(intl) from mblk /root/LIS/LiS-2.18_mvlcge31-preeemptive/head/head.c 1751
             rptr=0xc29cab3c wptr=0xc29cab3c size=20
 strputmsg: stream loop(234,1): send 0/20 ctl/data bytes downstream to loop
 strputmsg: q = 0xc5b5ad60, msg = 0xc29caafc
 putnext: M_DATA from "str_wput" to "loop" size 64
         q=c5b5ad60, mp=c29caafc, mp->b_rptr=c29cab3c, wptr=c29cab50
 putnext: M_DATA from "loop" to "str_rput" size 64
         q=c5b5a744, mp=c29caafc, mp->b_rptr=c29cab3c, wptr=c29cab50
 lis_strrput: loop(234,2) queueing M_DATA
 lis_head_get(h@0xc49d0d40/++2/1) "loop(234,2)" {head.c@0}
 lis_head_put(h@0xc49d0040/--1/1) "loop(234,1)" {head.c@0}
 lis_strioctl(i@0xc343c2c0/1,f@0xc80740c4/2,cmd=0x5322,arg=0x2) << i_rdev=0xea00001
 lis_head_get(h@0xc49d0040/++2/1) "loop(234,1)" {head.c@0}
 lis_strioctl(...,I_CANPUT,...) "loop(234,1)" >> rslt=1
 lis_head_put(h@0xc49d0040/--1/1) "loop(234,1)" {head.c@0}
 lis_head_get(h@0xc49d0040/++2/1) "loop(234,1)" {head.c@0}
 lis_kmem_cache_allochdr: allocated c29cab84
 lis_allocb: mp=0xc29cab84 dp=0xc29caba8(intl) from mblk /root/LIS/LiS-2.18_mvlcge31-preeemptive/head/head.c 1751
             rptr=0xc29cabc4 wptr=0xc29cabc4 size=23
 strputmsg: stream loop(234,1): send 0/23 ctl/data bytes downstream to loop
 strputmsg: q = 0xc5b5ad60, msg = 0xc29cab84
 putnext: M_DATA from "str_wput" to "loop" size 64
         q=c5b5ad60, mp=c29cab84, mp->b_rptr=c29cabc4, wptr=c29cabdb
 putnext: M_DATA from "loop" to "str_rput" size 64
         q=c5b5a744, mp=c29cab84, mp->b_rptr=c29cabc4, wptr=c29cabdb
 lis_strrput: loop(234,2) queueing M_DATA
 lis_head_put(h@0xc49d0040/--1/1) "loop(234,1)" {head.c@0}
 lis_dget: d@0xc5c1f220/2 m:4 i@0xc720ad40/1 "loop.1"
 >> parent: d@0xcfbf8138/223 m:4 i@0xcfbf7d80/1 "dev"
 >> parent: d@0xc13daf24/108 m:4 i@0xcfbf78c0/1 "/"
 lis_stropen(i@0xc720ad40/1,f@0xc8f60184/1)#261
     << i_rdev=(234,1) f_mode=03 f_flags=0x2 <[4] 4 LiS inode(s), 3 open stream(s)>
     << d@0xc5c1f220/1 m@0xcffef3ac/1231
 lis_show_inode_aliases(i@0xc720ad40/1.1#40063):
 >> dentry: d@0xc5c1f220/2 m:4 i@0xc720ad40/1 "loop.1"
 >> parent: d@0xcfbf8138/223 m:4 i@0xcfbf7d80/1 "dev"
 >> parent: d@0xc13daf24/108 m:4 i@0xcfbf78c0/1 "/"
 lis_lookup_stdata(d0xea00001,d@0xc5c1f220/2,h@0x00000000/0/0) <same>
     >> h@0xc49d0040/1/1 i@0xc343c2c0/1
 lis_head_get(h@0xc49d0040/++2/1) "loop(234,1)" {head.c@0}
 lis_qopen(q@0xc5b5aac4,...) calling driver "loop" open @0xd0861920 (dev=ea00001,flag=2,sflag=0)
 lis_cleanup_file_opening(f@0xc8f60184/1,h@0xc49d0040/2/1,0)
  "/dev/loop.1"
 >> dentry: d@0xc5c1f220/2 m:4 i@0xc720ad40/1 "loop.1"
 >> parent: d@0xcfbf8138/223 m:4 i@0xcfbf7d80/1 "dev"
 >> parent: d@0xc13daf24/108 m:4 i@0xcfbf78c0/1 "/"
 lis_dput: d@0xc5c1f220/2 m:4 i@0xc720ad40/1 "loop.1"
 >> parent: d@0xcfbf8138/223 m:4 i@0xcfbf7d80/1 "dev"
 >> parent: d@0xc13daf24/108 m:4 i@0xcfbf78c0/1 "/"
 lis_stropen(i@0xc720ad40/1,f@0xc8f60184/1)#261
     >> h@0xc49d0040/2/2 "loop(234,1)" i@0xc720ad40/1 rq@0xc5b5ac84 wq@0xc5b5ad60
     >> d@0xc5c1f220/1 m@0xcffef3ac/1231
 lis_show_inode_aliases(i@0xc720ad40/1.1#40063):
 >> dentry: d@0xc5c1f220/1 m:4 i@0xc720ad40/1 "loop.1"
 >> parent: d@0xcfbf8138/223 m:4 i@0xcfbf7d80/1 "dev"
 >> parent: d@0xc13daf24/108 m:4 i@0xcfbf78c0/1 "/"
 STREAM "loop(234,1)":  str_wput<==>loop
 lis_stropen(i@0xc720ad40/1,f@0xc8f60184/1)#261 done OK...
     >> <[4] 4 LiS inode(s), 3 open stream(s)>
 lis_head_get(h@0xc49d0040/++3/2) "loop(234,1)" {head.c@0}
 lis_head_put(h@0xc49d0040/--2/2) "loop(234,1)" {head.c@0}
 lis_strioctl(i@0xc720ad40/1,f@0xc8f60184/2,cmd=0x53ff,arg=0x0) << i_rdev=0xea00001
 lis_head_get(h@0xc49d0040/++3/2) "loop(234,1)" {head.c@0}
 lis_head_put(h@0xc49d0040/--2/2) "loop(234,1)" {head.c@0}
 lis_head_get(h@0xc49d0040/++3/2) "loop(234,1)" {head.c@0}
 strtst:
 STREAMS debug mask set to 0x0000000000000000
 strtst: band_test: band 2 full (10347 msgs), write band 1
 strtst:    6966 messages available to read
 strtst: receive_band: OK: Seq=20000 Band=2 M_DATA
 strtst:
 STREAMS debug mask set to 0x0000000000000000
 strtst: receive_band(2): seq=30186 Bad message
 strtst:


 strtst: ****************************************************
 strtst: *                  Test Failed                     *
 strtst: ****************************************************
Kernel Oops in fifo_test .txt (text/plain, 5.6 KB) 
*** strtst output ****
STREAMS-based FIFO/pipe test
fifo_test: open("/dev/fifo",O_RDWR) #1: fd 4 mode 020666 dev 0xe85d
fifo_test: open("/dev/fifo",O_RDWR) #2: fd 5 mode 020666 dev 0xe85e
fifo_test: open("/dev/fifo.0",O_RDWR) #1: fd 4 mode 020666 dev 0xe85f
Then strtst hangs.......


*** /var/log/messages ***
 .....
 strtst: fifo_test: open("/dev/fifo.0",O_RDWR) #1: fd 4 mode 020666 dev 0xe85f
 lis_freeb: (data blk) dp=0xcfd46d20(extl) dp->db_base=0xc3e6b0e4 dp->db_lim=0xc3e6b132 dp->db_size=78
 lis_freeb: (mblk) bp=0xcfd46cfc dp=0xcfd46d20
 lis_msgb_cache_freehdr: freed cfd46cfc
 lis_free: 0xc3e6b0e4: mvlcge31-preeemptive/head/msg.c #639, size=80
 lis_head_put(h@0xc491c040/--1/1) "printk(236,0)" {head.c@0}
 lis_dget: d@0xc7ad2688/3 m:3 i@0xc7ac8ce0/1 "fifo.0"
 >> parent: d@0xcfbf8138/32 m:3 i@0xcfbf7d80/1 "dev"
 >> parent: d@0xc13daf24/78 m:3 i@0xcfbf78c0/1 "/"
 lis_stropen(i@0xc7ac8ce0/1,f@0xc7a2b444/1)#27115
     << i_rdev=(232,0) f_mode=03 f_flags=0x2 <[3] 3 LiS inode(s), 2 open stream(s)>
     << d@0xc7ad2688/2 m@0xcffef3ac/1242
 lis_show_inode_aliases(i@0xc7ac8ce0/1.1#40054):
 >> dentry: d@0xc7ad2688/3 m:3 i@0xc7ac8ce0/1 "fifo.0"
 >> parent: d@0xcfbf8138/32 m:3 i@0xcfbf7d80/1 "dev"
 >> parent: d@0xc13daf24/78 m:3 i@0xcfbf78c0/1 "/"
 lis_lookup_stdata(d0xe800000,d@0xc7ad2688/3,h@0x00000000/0/0) <reopen>
     >> h@0xc491cd40/1/1 i@0xc817a120/1 dev 0xe80005f
 lis_head_get(h@0xc491cd40/++2/1) "fifo(232,95)" {head.c@0}
 lis_qopen(q@0xc491b584,...) calling module "fifo" open @0xd0861360 (dev=e80005f,flag=2,sflag=1)
 Unable to handle kernel paging request at virtual address 0000ee20
  printing eip:
 c02a97b9
 *pde = 00000000
 Oops: 0000
 streams-mtdrv streams 3c59x
 CPU:    0
 EIP:    0060:[<c02a97b9>]    Not tainted
 EFLAGS: 00210297
 eax: 0000ee20   ebx: 0000000a   ecx: 0000ee20   edx: fffffffe
 esi: d08d6899   edi: 00000000   ebp: ffffffff   esp: c4c15d90
 ds: 0068   es: 0068   ss: 0068
 Process strtst (pid: 11659, stackpage=c4c15000)
 Stack: d08d6892 ffffffff 000069eb 00000000 0000000a ffffffff 00000004 00000002
        ffffffff ffffffff 0000e800 c7ac8ce0 00000000 c7a2b444 c02a9967 d08d6860
        2f7297a0 d088fa8e c4c15e10 d0885ba3 d08d6860 d088fa60 c4c15df8 0000e800
 Call Trace: [<d08d6892>]  [<c02a9967>]  [<d08d6860>]  [<d088fa8e>]  [<d0885ba3>]  [<d08d6860>]  [<d088fa60>]  [<d087b2c2>]  [<d088fa60>]  [<d0869a9e>]  [<d088b3c0>]  [<d086cc4a>]  [<c014e29d>]  [<c014e4c6>]  [<c014e460>]  [<c014c87d>]  [<c014c7a8>]  [<c014cb8b>]  [<c01096bf>]
 Code: 80 38 00 74 07 40 4a 83 fa ff 75 f4 29 c8 83 e7 10 89 c3 75
  <6>note: strtst[11659] exited with preempt_count 1
 lis_strclose(i@0xc8a67120/1,f@0xc81ea134/0)#26297 i_rdev=(236,0)
     << d@0xc4f514b8/1 <[3] 3 LiS inode(s), 2 open stream(s)>
 lis_doclose(i@0xc8a67120/1,f@0xc81ea134/0,h@0xc491c040/1/1.0,...)#28337/26297
     << "printk(236,0)" d@0xc4f514b8/1 <[3] 3 LiS inode(s), 2 open stream(s)>
 STREAM "printk(236,0)":  str_wput<==>printk
 lis_cleanup_file_closing(f@0xc81ea134/0,h@0xc491c040/1/0) [3] <LiS> <lis_mnt> "LiS/printk(236,0)"
 >> dentry: d@0xc4f514b8/1 <LiS> m:3 i@0xc8a67120/1 <LiS> "printk(236,0)"
 >> parent: d@0xc7261dc8/4 <LiS> m:3 i@0xc4ac79c0/1 <LiS> "LiS/"
 lis_kmem_cache_allochdr: allocated cfd46cfc
 lis_allocb: mp=0xcfd46cfc dp=0xcfd46d20(intl) from mblk /root/LIS/LiS-2.18_mvlcge31-preeemptive/head/head.c 2779
             rptr=0xcfd46d3c wptr=0xcfd46d3c size=8
 putnext: M_FLUSH from "str_wput" to "printk" size 64
         q=c491b120, mp=cfd46cfc, mp->b_rptr=cfd46d3c, wptr=cfd46d3d
 lis_freeb: (mblk) bp=0xcfd46cfc dp=0xcfd46d20
 lis_msgb_cache_freehdr: freed cfd46cfc
 freezestr: stream printk(236,0) queue printk
 lis_head_get(h@0xc491c040/++2/0) "printk(236,0)" {head.c@0}
 lis_qdetach(q@0xc491b204,?1,...) "printk" >> calling close(...)
 lis_qdetach(q@0xc491b204,...) "printk" >> wq=c491b2e0 rq=c491b204 next=00000000 unfrzq=c491b044 prev=c491b044
 lis_qdetach(q@0xc491b204,...) "printk" >> linking around read queue
 lis_qdetach(q@0xc491b204,...) "printk" >> deallocating queues
 unfreezestr: stream printk(236,0) queue str_rput
 lis_head_get(h@0xc491c040/++3/0) "printk(236,0)" {head.c@0}
 lis_head_put(h@0xc491c040/--2/0) "printk(236,0)" {head.c@0}
 lis_head_put(h@0xc491c040/--1/0) "printk(236,0)" {head.c@0}
 lis_qdetach: closing_pipe=0 hd=c491c040 hd->sd_peer=00000000
 freezestr: stream printk(236,0) queue str_rput
 lis_head_get(h@0xc491c040/++2/0) "printk(236,0)" {head.c@0}
 lis_qdetach(q@0xc491b044,...) "str_rput" >> wq=c491b120 rq=c491b044 next=00000000 unfrzq=00000000 prev=00000000
 lis_qdetach(q@0xc491b044,...) "str_rput" >> deallocating queues
 lis_head_put(h@0xc491c040/--1/0) "printk(236,0)" {head.c@0}
 lis_qdetach: closing_pipe=0 hd=c491c040 hd->sd_peer=00000000
 lis_head_put(h@0xc491c040/--0/0) "printk(236,0)" {head.c@0}
 lis_free_stdata(h@0xc491c040/0/0) "printk(236,0)"
 lis_modput() <"streams"/5>-- {head.c@1650,lis_free_stdata()}
 lis_modput_local() <"streams">-- {head.c@1650,lis_free_stdata()}
 lis_doclose(...)#28337/26297 >> <[3] 3 LiS inode(s), 1 open stream(s)>
 lis_dentry_delete(d@0xc4f514b8/0) [3] d<LiS>
 lis_dentry_iput: d@0xc4f514b8/0 <LiS> m:3 "printk(236,0)"
 >> parent: d@0xc7261dc8/4 <LiS> m:3 i@0xc4ac79c0/1 <LiS> "LiS/"
 lis_super_put_inode(i@0xc8a67120/1) <LiS> i_rdev=0xec00000 <[3] 3 LiS inode(s)>--
 lis_strclose(i@0xc817a120/1,f@0xc93ff2c4/0)#26298 i_rdev=(232,95)
     << d@0xc7ad25a0/1 <[3] 2 LiS inode(s), 1 open stream(s)>
 lis_doclose(i@0xc817a120/1,f@0xc93ff2c4/0,h@0xc491cd40/2/1.0,...)#28338/26298
     << "fifo(232,95)" d@0xc7ad25a0/1 <[3] 2 LiS inode(s), 1 open stream(s)>
 STREAM "fifo(232,95)":  fifo
 lis_fifo_close_sync(i@0xc817a120/1,f@0xc93ff2c4/0)#26298 "fifo(232,95)" >> 0 reader(s) 0 writer(s)
 Then strtst hangs.......
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