Calling ipseckey from multithreaded application

Hello
My multithreaded network C++ application calls Solaris ipseckey utility concurrently while deleting/adding IPSEC SA without any additional synchronisation.
Application can call concurrently in threads constructions like
FILE * fp = popen("/usr/sbin/ipseckey -f <file with commands>","r");
pclose(fp);
Does anybody knows if it is safe to do it in such way without synchronisation?
I didn't find inter-process synchronisation in ipseckey code opposite to ipsecconf utility where such synchronisation is provided by lock file.
I am suspecting that ipseckey is not "Multiple Process" safe.
Sometimes during application running I see system panic with stack like below.
SunOS xxx 5.10 Generic_139555-08 sun4v sparc SUNW,T5140
Apr 6 12:43:26 WS_same_subnet unix: [ID 783603 kern.notice] Deadlock: cycle in blocking chain
Apr 6 12:43:26 WS_same_subnet unix: [ID 100000 kern.notice]
Apr 6 12:43:26 WS_same_subnet genunix: [ID 723222 kern.notice] 000002a10203eeb0 genunix:turnstile_block+630 (1271800, 3b, 60010b3ea70, 182b110, 0, 0)
Apr 6 12:43:26 WS_same_subnet genunix: [ID 179002 kern.notice] %l0-3: 000000000182b110 0000000000000000 0000060013db0550 00000600134a6d08
Apr 6 12:43:26 WS_same_subnet %l4-7: 00000300044c0be0 0000000000000001 0000000000000000 0000000000000000
Apr 6 12:43:26 WS_same_subnet genunix: [ID 723222 kern.notice] 000002a10203ef60 unix:mutex_vector_enter+428 (1872380, 2, 60010b3ea70, fff999198400ec63, 300044c0be0, 0)
Apr 6 12:43:26 WS_same_subnet genunix: [ID 179002 kern.notice] %l0-3: 00000000018f1fe0 0000000000000000 0000000000000000 0000000000000000
Apr 6 12:43:26 WS_same_subnet %l4-7: 00000300044c0be0 0000000000000001 000000000182b148 000000000182b140
Apr 6 12:43:26 WS_same_subnet genunix: [ID 723222 kern.notice] 000002a10203f010 ipsecah:get_ipsa_pair+1a4 (6001c7312c0, 60010b3c000, 60010b3ea68, 6001087e9b0, 6001bc77628, 2)
Apr 6 12:43:26 WS_same_subnet genunix: [ID 179002 kern.notice] %l0-3: 0000060010b3c060 000000007bf1f420 000006001c7312dc 0000000000000000
Apr 6 12:43:26 WS_same_subnet %l4-7: 000000000000006f 0000060010b3c068 0000060010b3ea70 000000000b07016f
Apr 6 12:43:26 WS_same_subnet genunix: [ID 723222 kern.notice] 000002a10203f0e0 ipsecah:sadb_delget_sa+13c (600115785c0, 60015db68f0, 6001087e990, 2a10203f29c, 600126b54b8, 13)
Apr 6 12:43:26 WS_same_subnet genunix: [ID 179002 kern.notice] %l0-3: 0000000000000001 0000000000000000 0000000000000000 00000300011d61b0
Apr 6 12:43:26 WS_same_subnet %l4-7: 00000300011d6440 0000000000000004 0000060015db68f8 0000000000000027
Apr 6 12:43:26 WS_same_subnet genunix: [ID 723222 kern.notice] 000002a10203f1e0 ipsecesp:esp_parse_pfkey+cc (3, 3, 6001087e940, 60015db68f0, f8, 6001c7312b0)
Apr 6 12:43:26 WS_same_subnet genunix: [ID 179002 kern.notice] %l0-3: 0000060015db6a50 000000007dfaae03 ffffffffffffffff 000000007dfaae04
Apr 6 12:43:26 WS_same_subnet %l4-7: 000000007dfaac00 00000600115785c0 000000007bbb32c4 000000007bbb3000
Apr 6 12:43:26 WS_same_subnet genunix: [ID 723222 kern.notice] 000002a10203f2a0 unix:putnext+218 (600126b56a8, 600126b55b0, 600115785c0, 100, 600126b5320, 0)
Apr 6 12:43:26 WS_same_subnet genunix: [ID 179002 kern.notice] %l0-3: 0000000000000000 0000000000000000 0000000000000000 0000000000005350
Apr 6 12:43:26 WS_same_subnet %l4-7: 000000000000010d 00000000019831d8 000000007bbb35dc fffffd5efdfc6000
Apr 6 12:43:26 WS_same_subnet genunix: [ID 723222 kern.notice] 000002a10203f350 keysock:keysock_parse+270 (60019e0f5f0, 600137bd200, 290, 0, 30001b04f40, 600164ed0a0)
Apr 6 12:43:26 WS_same_subnet genunix: [ID 179002 kern.notice] %l0-3: 0000060010b54a80 000006001c7312b0 0000000000000048 000002a10203f408
Apr 6 12:43:26 WS_same_subnet %l4-7: 000000007bbcffe0 000000007bbcfc00 0000000000000003 0000000000000003
Apr 6 12:43:26 WS_same_subnet genunix: [ID 723222 kern.notice] 000002a10203f4e0 unix:putnext+218 (600109a3868, 600164ed0a0, 6001cb61140, 100, 6001bde6988, 0)
Apr 6 12:43:26 WS_same_subnet genunix: [ID 179002 kern.notice] %l0-3: 0000000000000000 0000000000000000 0000000000000000 0000000000005590
Apr 6 12:43:26 WS_same_subnet %l4-7: 000000000000010d 0000000070000ef0 000000007bbd0678 fffffd5efdfc6000
Apr 6 12:43:26 WS_same_subnet genunix: [ID 723222 kern.notice] 000002a10203f590 genunix:strput+1d8 (600190044f0, 6001cb61140, 6da1, 6001cb61140, 60013c72fd0, 0)
Apr 6 12:43:26 WS_same_subnet genunix: [ID 179002 kern.notice] %l0-3: 000006001bde6988 0000000000000004 0000000000000000 0000000000000000
Apr 6 12:43:26 WS_same_subnet %l4-7: 000006001c76e580 00000600134a6d08 0000000000000000 0000000000000000
Apr 6 12:43:26 WS_same_subnet genunix: [ID 723222 kern.notice] 000002a10203f790 genunix:kstrputmsg+33c (6001a371040, 60015f60fc0, 2a10203fa98, 6001cb61140, 2, 0)
Apr 6 12:43:26 WS_same_subnet genunix: [ID 179002 kern.notice] %l0-3: 0000000000000003 0000000000000000 0000000000000004 00000600190044f0
Apr 6 12:43:26 WS_same_subnet %l4-7: 0000060019004570 0000000000000000 0000000000000000 0000000000000000
Apr 6 12:43:26 WS_same_subnet genunix: [ID 723222 kern.notice] 000002a10203f870 sockfs:sosend_svc+94 (6001c175320, 2a10203fa98, 3, 0, 61, 0)
Apr 6 12:43:26 WS_same_subnet genunix: [ID 179002 kern.notice] %l0-3: 0000000000000008 000002a10203f928 0000000000000001 0000000000000004
Apr 6 12:43:26 WS_same_subnet %l4-7: 0000000000000001 000006001c175340 0000000000000021 0000000000000048
Apr 6 12:43:26 WS_same_subnet genunix: [ID 723222 kern.notice] 000002a10203f930 genunix:fop_write+20 (6001a371040, 2a10203fa98, 0, 60012743560, 0, 133da18)
Apr 6 12:43:26 WS_same_subnet genunix: [ID 179002 kern.notice] %l0-3: 0000000000000048 0000000000002420 0000000000002000 0000000000000009
Apr 6 12:43:26 WS_same_subnet %l4-7: 000006001086a080 0000060010883500 00000600108839e8 00000000022169e2
Apr 6 12:43:26 WS_same_subnet genunix: [ID 723222 kern.notice] 000002a10203f9e0 genunix:write+268 (5, 8058, 600192090e0, 48, 3, 1)
Apr 6 12:43:26 WS_same_subnet genunix: [ID 179002 kern.notice] %l0-3: 0000000000000000 000006001a371040 0000000000000000 0000000000008b10
Apr 6 12:43:26 WS_same_subnet %l4-7: 0000000000000048 0000000000000128 0000000000000000 0000000000000003
Apr 6 12:43:26 WS_same_subnet unix: [ID 100000 kern.notice]
Apr 6 12:43:26 WS_same_subnet genunix: [ID 672855 kern.notice] syncing file systems...

Thank you
I selected the following threads from mdb output
000003000475ee40 600133c9120 600115535d0 1 58 60010b58200
PC: turnstile_block+0x600 CMD: /usr/sbin/ipseckey -f /tmp/ipsecWPXbJe4xN
stack pointer for thread 3000475ee40: 2a101e3c6b1
[ 000002a101e3c6b1 turnstile_block+0x600() ]
mutex_vector_enter+0x428()
get_ipsa_pair+0x1a4()
sadb_delget_sa+0x13c()
esp_parse_pfkey+0xcc()
putnext+0x218()
keysock_parse+0x270()
putnext+0x218()
strput+0x1d8()
kstrputmsg+0x33c()
sosend_svc+0x94()
fop_write+0x20()
write+0x268()
syscall_trap32+0xcc()
000003000443f5e0 6001352f1c0 60015c4d778 1 49 60010b56068
PC: panicsys+0x48 CMD: /usr/sbin/ipseckey -f /tmp/ipsecVPXaJe4xN
stack pointer for thread 3000443f5e0: 2a101f0c6d1
turnstile_block+0x630()
mutex_vector_enter+0x428()
sadb_delget_sa+0x1a4()
esp_parse_pfkey+0xcc()
putnext+0x218()
keysock_parse+0x270()
putnext+0x218()
strput+0x1d8()
kstrputmsg+0x33c()
sosend_svc+0x94()
fop_write+0x20()
write+0x268()
syscall_trap32+0xcc()
Using of PF_KEY will be our next step for better performance.

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