backtrace: *** Tracing pid 3168 tid 100195 td 0xc41cf960 uma_zfree_internal(c1061960,c32ef400,0,1,3,0,c106c8c0,dacd7c60) at uma_zfree_internal+0x120 uma_zfree_arg(c1061960,c32ef400,0,c0807c76,0) at uma_zfree_arg+0x3ea malloc_uninit(c0993100,c0807c76,dacd7c5c,dacd7c60,0) at malloc_uninit+0x109 linker_file_sysuninit(c32e4600,c0846120,0,c3d01100,0) at linker_file_sysuninit+0xa0 linker_file_unload(c32e4600,0,dacd7cd0,c05fa4f8,c41cf960) at linker_file_unload+0x144 kern_kldunload(c41cf960,7,0,dacd7d30,c07c2310) at kern_kldunload+0xd2 kldunloadf(c41cf960,dacd7d04,8,c41cf960,4) at kldunloadf+0x2c syscall(3b,3b,3b,7,bfbfee72) at syscall+0x380 Xint0x80_syscall() at Xint0x80_syscall+0x1f --- syscall (444, FreeBSD ELF32, kldunloadf), eip = 0x280ba877, esp = 0xbfbfe90c, ebp = 0xbfbfed78 --- *** panic string: *** sbp0: detached Fatal trap 12: page fault while in kernel mode cpuid = 0; apic id = 00 fault virtual address = 0x15 fault code = supervisor read, page not present instruction pointer = 0x20:0xc0759760 stack pointer = 0x28:0xdacd7bc8 frame pointer = 0x28:0xdacd7be8 code segment = base 0x0, limit 0xfffff, type 0x1b = DPL 0, pres 1, def32 1, gran 1 processor eflags = interrupt enabled, resume, IOPL = 0 current process = 3168 (kldunload) *** output of "show uma": *** db> show uma Zone Allocs Frees Used Cache NetGraph items 24771234 24771234 0 390 FFS2 dinode 3308171 3298325 9846 11169 FFS1 dinode 0 0 0 0 FFS inode 3308171 3298325 9846 13470 SWAPMETA 19274 15886 3388 280 pfosfp 188 0 188 193 pfospfen 345 0 345 87 pfiaddrpl 0 0 0 0 pfstatescrub 0 0 0 0 pffrcent 0 0 0 0 pffrcache 0 0 0 0 pffrag 0 0 0 0 pffrent 0 0 0 0 pfrkentry2 0 0 0 0 pfrkentry 0 0 0 0 pfrktable 0 0 0 0 pfpooladdrpl 0 0 0 0 pfaltqpl 0 0 0 0 pfstatepl 0 0 0 0 pfrulepl 0 0 0 0 pfsrctrpl 0 0 0 0 rtentry 87 59 28 88 unpcb 8182 8133 49 119 ripcb 15 14 1 65 sackhole 13044 13044 0 507 tcpreass 566092 566092 0 507 hostcache 4947 4814 133 817 syncache 29421 29421 0 195 tcptw 14889 14887 2 466 tcpcb 49129 48973 156 532 inpcb 49129 48971 158 722 udpcb 21003 20991 12 98 socket 78437 78217 220 506 KNOTE 30031 30031 0 168 PIPE 92367 92348 19 323 DIRHASH 14399 13634 765 595 NFSNODE 0 0 0 0 NFSMOUNT 0 0 0 0 NAMEI 10775109 10775109 0 180 L VFS Cache 32272 32246 26 312 S VFS Cache 3684054 3673623 10431 16449 VNODEPOLL 1 0 1 99 VNODE 3317412 3307499 9913 22861 ata_composite 0 0 0 0 ata_request 246253 246253 0 323 g_bio 6311045 6311045 0 580 ACL UMA zone 18859235 18859235 0 40 mbuf_cluster 2212812 2212110 702 0 mbuf 64727120 64727084 36 327 mbuf_packet 34451321 34450986 335 367 VMSPACE 202756 202671 85 110 UPCALL 0 0 0 0 KSEGRP 245 0 245 35 THREAD 245 0 245 15 PROC 202813 202671 142 103 Files 2857485 2856959 526 534 4096 207540 207122 418 168 2048 41055 40829 226 508 1024 140693 140542 151 109 512 656130 656009 121 367 256 524715 524014 701 454 128 2055977 2053077 2900 1450 64 6065832 6061285 4547 704 32 2615393 2613280 2113 1164 16 97226921 97224153 2768 683 mt_zone 201 1 200 247 DP fakepg 65 14 51 108 PV ENTRY 111493291 111433335 59956 30524 MAP ENTRY 7348552 7344017 4535 617 KMAP ENTRY 153082 152334 748 708 MAP 7 0 7 33 VM OBJECT 3905426 3901853 3573 27051 128 Bucket 3978 3400 578 24 64 Bucket 212 156 56 42 32 Bucket 110 66 44 40 16 Bucket 83 56 27 73 UMA Hash 3 3 0 30 UMA RCntSlabs 16305 15954 351 93 UMA Slabs 23097 21456 1641 424 UMA Zones 79 0 79 1 UMA Kegs 79 0 79 17 db> *** output of "show threads": *** db> show threads 100195 (0xc41cf960) uma_zfree_internal(c1061960,c32ef400,0,1,3,0,c106c8c0,dac d7c60) at uma_zfree_internal+0x120 100218 (0xc3c05af0) sched_switch(c3c05af0,0,1,5cf9bf6b,9d20eb13) at sched_swi tch+0x150 100236 (0xc41ce190) sched_switch(c41ce190,0,1,5c43e3eb,3d6e7ad5) at sched_swi tch+0x150 100198 (0xc41cf4b0) sched_switch(c41cf4b0,0,1,8fcfe7eb,a73ae5fe) at sched_swi tch+0x150 100172 (0xc41cee10) sched_switch(c41cee10,0,1,6ce8b06b,86ccc676) at sched_swi tch+0x150 100148 (0xc3bac190) sched_switch(c3bac190,0,1,cff0aeb,4563974b) at sched_swit ch+0x150 100191 (0xc47b5000) sched_switch(c47b5000,0,1,9fb99f6b,bd5ec7f2) at sched_swi tch+0x150 100105 (0xc3bb74b0) sched_switch(c3bb74b0,0,1,a3a5406b,b4ea26bd) at sched_swi tch+0x150 100110 (0xc3badc80) sched_switch(c3badc80,0,1,c53dc2eb,18f51145) at sched_swi tch+0x150 100147 (0xc3bac320) sched_switch(c3bac320,0,1,522a30eb,94c6403c) at sched_swi tch+0x150 100156 (0xc411d4b0) sched_switch(c411d4b0,0,1,7afaa76b,3c81b724) at sched_swi tch+0x150 100167 (0xc3ce6960) sched_switch(c3ce6960,0,1,35799deb,1017467f) at sched_swi tch+0x150 100085 (0xc3ba7000) sched_switch(c3ba7000,0,1,b904c6eb,87bc23e4) at sched_swi tch+0x150 100224 (0xc3c05190) sched_switch(c3c05190,0,1,efa67feb,918735f9) at sched_swi tch+0x150 100144 (0xc3bac7d0) sched_switch(c3bac7d0,0,1,4601faeb,93ef9a2d) at sched_swi tch+0x150 100166 (0xc3ce6af0) sched_switch(c3ce6af0,0,1,8d442feb,9a04f51f) at sched_swi tch+0x150 100135 (0xc3f75af0) sched_switch(c3f75af0,0,1,1e1c32eb,5aad99f7) at sched_swi tch+0x150 100099 (0xc33e57d0) sched_switch(c33e57d0,0,1,b347846b,4068b2bd) at sched_swi tch+0x150 100177 (0xc3f76960) sched_switch(c3f76960,0,1,f288e46b,5eee0593) at sched_swi tch+0x150 100137 (0xc3f757d0) sched_switch(c3f757d0,0,1,4e6f846b,fff94255) at sched_swi tch+0x150 100162 (0xc3f75190) sched_switch(c3f75190,0,1,b0eec86b,7286f229) at sched_swi tch+0x150 100146 (0xc3bac4b0) sched_switch(c3bac4b0,0,1,ee57f6b,e3fdf6) at sched_switch +0x150 100134 (0xc3f75c80) sched_switch(c3f75c80,0,1,2927c1eb,a12beb4) at sched_swit ch+0x150 100181 (0xc3f76320) sched_switch(c3f76320,0,1,9064adeb,2199ffa) at sched_swit ch+0x150 100199 (0xc3e58640) sched_switch(c3e58640,0,1,928ed1eb,2c55f7bb) at sched_swi tch+0x150 100093 (0xc3750320) sched_switch(c3750320,0,1,31fb4beb,635fa7bd) at sched_swi tch+0x150 100125 (0xc3ce57d0) sched_switch(c3ce57d0,0,1,816cfb6b,2f5e3165) at sched_swi tch+0x150 100132 (0xc3f76000) sched_switch(c3f76000,0,1,fcc533eb,86368de1) at sched_swi tch+0x150 100165 (0xc3ce6c80) sched_switch(c3ce6c80,0,1,c6e9f16b,f83f98d0) at sched_swi tch+0x150 100113 (0xc3bad7d0) sched_switch(c3bad7d0,0,1,b82337eb,6c3174be) at sched_swi tch+0x150 100136 (0xc3f75960) sched_switch(c3f75960,0,1,c346b56b,3eb426a1) at sched_swi tch+0x150 100160 (0xc3f76e10) sched_switch(c3f76e10,0,1,b15a346b,ba0f5ae5) at sched_swi tch+0x150 100109 (0xc3bade10) sched_switch(c3bade10,0,1,d34ec7eb,70f8a072) at sched_swi tch+0x150 100154 (0xc411d7d0) sched_switch(c411d7d0,0,1,6f3bf46b,78790ea9) at sched_swi tch+0x150 100088 (0xc3750af0) sched_switch(c3750af0,0,1,29aaf16b,eb113773) at sched_swi tch+0x150 100119 (0xc3ce6190) sched_switch(c3ce6190,0,1,64c868eb,2a07aa7b) at sched_swi tch+0x150 100081 (0xc3ba7640) sched_switch(c3ba7640,0,1,f00980eb,e1d292b6) at sched_swi tch+0x150 100089 (0xc3750960) sched_switch(c3750960,0,1,2bab67eb,d62eb8bd) at sched_swi tch+0x150 100117 (0xc3ce64b0) sched_switch(c3ce64b0,0,1,be06e4eb,57eb21e0) at sched_swi tch+0x150 100111 (0xc3badaf0) sched_switch(c3badaf0,0,1,c425b8eb,82c110ed) at sched_swi tch+0x150 100106 (0xc3bb7320) sched_switch(c3bb7320,0,1,556b0eeb,5797b35c) at sched_swi tch+0x150 100116 (0xc3ce6640) sched_switch(c3ce6640,0,1,b368466b,51b25045) at sched_swi tch+0x150 100053 (0xc33e5190) sched_switch(c33e5190,0,1,1a7fe96b,e444afad) at sched_swi tch+0x150 100108 (0xc3bb7000) sched_switch(c3bb7000,0,1,b19db86b,843ff7e5) at sched_swi tch+0x150 100094 (0xc3750190) sched_switch(c3750190,0,1,4dacb8eb,7a90db1d) at sched_swi tch+0x150 100115 (0xc3bad4b0) sched_switch(c3bad4b0,0,1,6cfb9f6b,7e6d0e42) at sched_swi tch+0x150 100118 (0xc3ce6320) sched_switch(c3ce6320,0,1,4d906beb,166a4ff2) at sched_swi tch+0x150 100071 (0xc374f320) sched_switch(c374f320,0,1,36f667eb,1d5ec150) at sched_swi tch+0x150 100095 (0xc3bad320) sched_switch(c3bad320,0,1,cbe675eb,43313a78) at sched_swi tch+0x150 100101 (0xc3bb7af0) sched_switch(c3bb7af0,0,1,22e4a5eb,3d4f89db) at sched_swi tch+0x150 100120 (0xc3ce6000) sched_switch(c3ce6000,0,1,f21aafeb,dd05993d) at sched_swi tch+0x150 100121 (0xc3ce5e10) sched_switch(c3ce5e10,0,1,2aa17feb,da0db949) at sched_swi tch+0x150 100122 (0xc3ce5c80) sched_switch(c3ce5c80,0,1,1fb39feb,dbc9d067) at sched_swi tch+0x150 100123 (0xc3ce5af0) sched_switch(c3ce5af0,0,1,3ac05aeb,dc5dc87c) at sched_swi tch+0x150 100087 (0xc3750c80) sched_switch(c3750c80,0,1,d91458eb,de9d7988) at sched_swi tch+0x150 100076 (0xc33e5af0) sched_switch(c33e5af0,0,1,e57ad86b,de061e5c) at sched_swi tch+0x150 100051 (0xc33e54b0) sched_switch(c33e54b0,0,1,916a6aeb,137046ed) at sched_swi tch+0x150 100097 (0xc3bad000) sched_switch(c3bad000,0,1,3a5d61eb,89cc23af) at sched_swi tch+0x150 100084 (0xc3ba7190) sched_switch(c3ba7190,0,1,2afb6b,c9f6b867) at sched_switc h+0x150 100082 (0xc3ba74b0) sched_switch(c3ba74b0,0,1,583592eb,59fc80e5) at sched_swi tch+0x150 100066 (0xc374faf0) sched_switch(c374faf0,0,1,eacd58eb,93b171e5) at sched_swi tch+0x150 100073 (0xc374f000) sched_switch(c374f000,0,1,cdbe3deb,3fc8017d) at sched_swi tch+0x150 100050 (0xc33e5640) sched_switch(c33e5640,0,1,f492016b,3eca573d) at sched_swi tch+0x150 100079 (0xc3ba7960) sched_switch(c3ba7960,0,1,4b509aeb,6218236) at sched_swit ch+0x150 100092 (0xc37504b0) sched_switch(c37504b0,0,1,51a48d6b,b36149c3) at sched_swi tch+0x150 100075 (0xc33e5c80) sched_switch(c33e5c80,0,1,da39406b,2fe9b3da) at sched_swi tch+0x150 100107 (0xc3bb7190) sched_switch(c3bb7190,0,1,217f18eb,ba0ece67) at sched_swi tch+0x150 100096 (0xc3bad190) sched_switch(c3bad190,0,1,5f0ffa6b,d58b1dfc) at sched_swi tch+0x150 100080 (0xc3ba77d0) sched_switch(c3ba77d0,0,1,d690626b,3c9d6f05) at sched_swi tch+0x150 100083 (0xc3ba7320) sched_switch(c3ba7320,0,1,1ab0686b,77b80ca6) at sched_swi tch+0x150 100102 (0xc3bb7960) sched_switch(c3bb7960,0,1,a6351beb,c2416ee5) at sched_swi tch+0x150 100103 (0xc3bb77d0) sched_switch(c3bb77d0,0,1,dd66826b,eab9a10b) at sched_swi tch+0x150 100104 (0xc3bb7640) sched_switch(c3bb7640,0,1,62866eeb,b97aa773) at sched_swi tch+0x150 100063 (0xc3750000) sched_switch(c3750000,0,1,3c311eeb,f79ced33) at sched_swi tch+0x150 100065 (0xc374fc80) sched_switch(c374fc80,0,1,ed01ebeb,abf8a4b) at sched_swit ch+0x150 100067 (0xc374f960) sched_switch(c374f960,0,1,bea249eb,d318f2f6) at sched_swi tch+0x150 100052 (0xc33e5320) sched_switch(c33e5320,0,1,106080eb,4f481765) at sched_swi tch+0x150 100074 (0xc33e5e10) sched_switch(c33e5e10,0,1,bc2702eb,985c5da4) at sched_swi tch+0x150 100070 (0xc374f4b0) sched_switch(c374f4b0,0,1,a9d3086b,d78375ea) at sched_swi tch+0x150 100054 (0xc33e5000) sched_switch(c33e5000,0,1,34f501eb,c887abc1) at sched_swi tch+0x150 100072 (0xc374f190) sched_switch(c374f190,0,1,4a51c76b,7a43b8e8) at sched_swi tch+0x150 100064 (0xc374fe10) sched_switch(c374fe10,0,1,6f9b4e6b,d62ef5ab) at sched_swi tch+0x150 100068 (0xc374f7d0) sched_switch(c374f7d0,0,1,62734f6b,121279b3) at sched_swi tch+0x150 100055 (0xc33e4e10) sched_switch(c33e4e10,0,1,381b816b,3e147be0) at sched_swi tch+0x150 100056 (0xc33e4c80) sched_switch(c33e4c80,0,1,d792ee6b,3e13dc84) at sched_swi tch+0x150 100057 (0xc33e4af0) sched_switch(c33e4af0,0,1,e9defeb,3e134b39) at sched_swit ch+0x150 100058 (0xc33e4960) sched_switch(c33e4960,0,1,45a8f16b,3e12b9ed) at sched_swi tch+0x150 100059 (0xc33e47d0) sched_switch(c33e47d0,0,1,dc420eb,70c88318) at sched_swit ch+0x150 100060 (0xc33e4640) sched_switch(c33e4640,0,1,d200e86b,938de87d) at sched_swi tch+0x150 100061 (0xc33e44b0) sched_switch(c33e44b0,0,1,1b471f6b,7453004c) at sched_swi tch+0x150 100062 (0xc33e4320) sched_switch(c33e4320,0,1,464e26b,6478b567) at sched_swit ch+0x150 100038 (0xc335eaf0) sched_switch(c335eaf0,0,1,849e836b,65b3dee2) at sched_swi tch+0x150 100039 (0xc335e960) sched_switch(c335e960,0,1,f5ead36b,b6284c41) at sched_swi tch+0x150 100040 (0xc335e7d0) sched_switch(c335e7d0,0,1,fd30adeb,f8885f52) at sched_swi tch+0x150 100041 (0xc335e640) sched_switch(c335e640,0,1,df3c4a6b,4df2540a) at sched_swi tch+0x150 100042 (0xc335e4b0) sched_switch(c335e4b0,0,1,3d71c56b,f987c68a) at sched_swi tch+0x150 100043 (0xc335e320) sched_switch(c335e320,0,1,d66fb3eb,adcffec) at sched_swit ch+0x150 100044 (0xc335e190) sched_switch(c335e190,0,1,557e76eb,7e03f213) at sched_swi tch+0x150 100045 (0xc335e000) sched_switch(c335e000,0,1,31d541eb,7f09fa43) at sched_swi tch+0x150 100046 (0xc3356e10) sched_switch(c3356e10,0,1,f5943b6b,7dfd4354) at sched_swi tch+0x150 100047 (0xc3356c80) sched_switch(c3356c80,0,1,424b75eb,adb7638) at sched_swit ch+0x150 100048 (0xc3356af0) sched_switch(c3356af0,0,1,e1c2e2eb,adad6dc) at sched_swit ch+0x150 100049 (0xc3356960) sched_switch(c3356960,0,1,521326eb,ada1b62) at sched_swit ch+0x150 100027 (0xc3356190) sched_switch(c3356190,0,1,1119f5eb,ad6c65b) at sched_swit ch+0x150 100028 (0xc3356000) fork_trampoline() at fork_trampoline 100029 (0xc3312e10) sched_switch(c3312e10,0,1,9b8b406b,32dfa7f9) at sched_swi tch+0x150 100030 (0xc3312c80) sched_switch(c3312c80,0,1,c8c5036b,a8683820) at sched_swi tch+0x150 100031 (0xc3312af0) sched_switch(c3312af0,0,1,cdc599eb,1053664f) at sched_swi tch+0x150 100032 (0xc3312960) sched_switch(c3312960,0,1,e24f89eb,f293d81c) at sched_swi tch+0x150 100033 (0xc33127d0) sched_switch(c33127d0,0,1,5168566b,2d00332b) at sched_swi tch+0x150 100034 (0xc3312640) sched_switch(c3312640,0,1,650076eb,35b98a61) at sched_swi tch+0x150 100035 (0xc33124b0) sched_switch(c33124b0,0,1,33e7496b,d8b22c42) at sched_swi tch+0x150 100036 (0xc335ee10) fork_trampoline() at fork_trampoline 100037 (0xc335ec80) sched_switch(c335ec80,0,1,60f260eb,a0dd9292) at sched_swi tch+0x150 100017 (0xc330e960) fork_trampoline() at fork_trampoline 100018 (0xc330e7d0) fork_trampoline() at fork_trampoline 100019 (0xc330e640) fork_trampoline() at fork_trampoline 100020 (0xc330e4b0) fork_trampoline() at fork_trampoline 100021 (0xc330e320) fork_trampoline() at fork_trampoline 100022 (0xc330e190) sched_switch(c330e190,0,1,88b45eb,20e09ef4) at sched_swit ch+0x150 100023 (0xc33567d0) sched_switch(c07a0028,86,c07abc91,c08a75b0,d56a0008) at s ched_switch+0x150 100024 (0xc3356640) sched_switch(c3356640,0,1,8212a0eb,e6bd18f4) at sched_swi tch+0x150 100025 (0xc33564b0) sched_switch(c33564b0,0,1,927aa46b,3544f94) at sched_swit ch+0x150 100026 (0xc3356320) sched_switch(c3356320,0,1,4ec6c0eb,1819ea41) at sched_swi tch+0x150 100008 (0xc330d320) sched_switch(c330d320,0,1,d3b0c8eb,6c424811) at sched_swi tch+0x150 100009 (0xc330d190) fork_trampoline() at fork_trampoline 100010 (0xc330d000) fork_trampoline() at fork_trampoline 100011 (0xc3312320) fork_trampoline() at fork_trampoline 100012 (0xc3312190) fork_trampoline() at fork_trampoline 100013 (0xc3312000) fork_trampoline() at fork_trampoline 100014 (0xc330ee10) fork_trampoline() at fork_trampoline 100015 (0xc330ec80) fork_trampoline() at fork_trampoline 100016 (0xc330eaf0) sched_switch(c330eaf0,0,1,8a9cd96b,c08c97b4) at sched_swi tch+0x150 100000 (0xc330e000) fork_trampoline() at fork_trampoline 100001 (0xc330de10) fork_trampoline() at fork_trampoline 100002 (0xc330dc80) fork_trampoline() at fork_trampoline 100003 (0xc330daf0) sched_switch(c330daf0,0,1,4a9492eb,909713b1) at sched_swi tch+0x150 100004 (0xc330d960) sched_switch(c330d960,0,1,acf5586b,2feb62c9) at sched_swi tch+0x150 100005 (0xc330d7d0) sched_switch(c330d7d0,0,1,c22f64eb,d8e710a1) at sched_swi tch+0x150 100006 (0xc330d640) sched_switch(c330d640,0,1,dc7a32eb,a506488f) at sched_swi tch+0x150 100007 (0xc330d4b0) sched_switch(c330d4b0,0,1,7397466b,ac4d070) at sched_swit ch+0x150 0 (0xc0873d40) sched_switch(c0873d40,0,1,5f6388eb,3de2c6c1) at sched_swi tch+0x150 db> ***