panic: pool_do_put: shmpl: double pool_put: 0xfffffd806b841000 Stopped at db_enter+0x25: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND 370794 75282 0 0 0 1 syz-executor * 32309 75282 0 0 0x4000000 0 syz-executor db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:437 panic(ffffffff8307b4ef) at panic+0x1e5 sys/kern/subr_prf.c:198 pool_do_put(ffffffff835a59f0,fffffd806b841000) at pool_do_put+0x1be sys/kern/subr_pool.c:841 pool_put(ffffffff835a59f0,fffffd806b841000) at pool_put+0xb3 sys/kern/subr_pool.c:799 shm_delete_mapping(fffffd806bf86aa0,ffff8000012b8008) at shm_delete_mapping+0x1ac shm_deallocate_segment sys/kern/sysv_shm.c:153 [inline] shm_delete_mapping(fffffd806bf86aa0,ffff8000012b8008) at shm_delete_mapping+0x1ac sys/kern/sysv_shm.c:174 syscall(ffff8000359b0770) at syscall+0xaf8 mi_syscall sys/sys/syscall_mi.h:178 [inline] syscall(ffff8000359b0770) at syscall+0xaf8 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xbc5efb2e410, count: 8 https://www.openbsd.org/ddb.html describes the minimum info required in bug reports. Insufficient info makes it difficult to find and fix bugs. ddb{0}> ddb{0}> set $lines = 0 ddb{0}> set $maxwidth = 0 ddb{0}> show panic *cpu0: pool_do_put: shmpl: double pool_put: 0xfffffd806b841000 ddb{0}> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:437 panic(ffffffff8307b4ef) at panic+0x1e5 sys/kern/subr_prf.c:198 pool_do_put(ffffffff835a59f0,fffffd806b841000) at pool_do_put+0x1be sys/kern/subr_pool.c:841 pool_put(ffffffff835a59f0,fffffd806b841000) at pool_put+0xb3 sys/kern/subr_pool.c:799 shm_delete_mapping(fffffd806bf86aa0,ffff8000012b8008) at shm_delete_mapping+0x1ac shm_deallocate_segment sys/kern/sysv_shm.c:153 [inline] shm_delete_mapping(fffffd806bf86aa0,ffff8000012b8008) at shm_delete_mapping+0x1ac sys/kern/sysv_shm.c:174 syscall(ffff8000359b0770) at syscall+0xaf8 mi_syscall sys/sys/syscall_mi.h:178 [inline] syscall(ffff8000359b0770) at syscall+0xaf8 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xbc5efb2e410, count: -7 ddb{0}> show registers rdi 0 rsi 0x1 rbp 0xffff8000359b04a0 rbx 0xffffffff83414dbf cpu_info_full_primary+0x2dbf rdx 0 rcx 0xffff80002a12b988 rax 0xffffffff83413ff0 cpu_info_full_primary+0x1ff0 r8 0x101010101010101 r9 0x8080808080808080 r10 0x4a48cb04455536fd r11 0x811011338b87bfe1 r12 0xffffffff83414bc0 cpu_info_full_primary+0x2bc0 r13 0 r14 0 r15 0x1 rip 0xffffffff81d0d485 db_enter+0x25 cs 0x8 rflags 0x246 rsp 0xffff8000359b0490 ss 0 db_enter+0x25: addq $0x8,%rsp ddb{0}> show proc PROC (syz-executor) tid=32309 pid=75282 tcnt=3 stat=onproc flags process=0 proc=4000000 runpri=32, usrpri=50, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff80002a12bc10,0xffff80002a12af78 process=0xffff800037260910 user=0xffff8000359ab000, vmspace=0xfffffd806bf86aa0 estcpu=36, cpticks=0, pctcpu=0.0, user=0, sys=0, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 39909 58017 33378 0 2 0 syz-executor 39909 40427 33378 0 3 0x4000080 lockf syz-executor 75282 370794 9457 0 7 0 syz-executor *75282 32309 9457 0 7 0x4000000 syz-executor 75282 71030 9457 0 3 0x4000080 fsleep syz-executor 90167 265184 42103 0 2 0 syz-executor 90167 88108 42103 0 3 0x4000080 fsleep syz-executor 94615 120482 50219 0 3 0x80 nanoslp syz-executor 94615 118560 50219 0 3 0x4000080 kqread syz-executor 94615 434251 50219 0 3 0x4000080 fifor syz-executor 94615 414718 50219 0 3 0x4000080 fsleep syz-executor 21627 299928 38431 0 3 0x80 nanoslp syz-executor 21627 157729 38431 0 3 0x4000080 fifor syz-executor 21627 164438 38431 0 3 0x4000080 fsleep syz-executor 37099 123644 92680 0 3 0x80 nanoslp syz-executor 37099 119570 92680 0 3 0x4000080 netcon syz-executor 37099 446981 92680 0 3 0x4000080 fsleep syz-executor 29265 454461 1 0 3 0x80 nanoslp init 65729 62349 90532 0 3 0x82 netio sshd-session 68178 305701 0 0 3 0x14280 nfsidl nfsio 74314 443761 0 0 3 0x14280 nfsidl nfsio 36752 314017 0 0 3 0x14280 nfsidl nfsio 14841 305602 0 0 3 0x14280 nfsidl nfsio 60386 335792 0 0 3 0x14280 nfsidl nfsio 5687 276915 0 0 3 0x14280 nfsidl nfsio 95088 92255 0 0 3 0x14280 nfsidl nfsio 96690 468015 0 0 3 0x14280 nfsidl nfsio 24160 502413 0 0 3 0x14280 nfsidl nfsio 97161 430378 0 0 3 0x14280 nfsidl nfsio 22206 264669 0 0 3 0x14280 nfsidl nfsio 63686 273812 0 0 3 0x14280 nfsidl nfsio 46294 370466 0 0 3 0x14280 nfsidl nfsio 29814 71865 0 0 3 0x14280 nfsidl nfsio 58516 240085 0 0 3 0x14280 nfsidl nfsio 46707 130851 0 0 3 0x14280 nfsidl nfsio 90630 155695 0 0 3 0x14280 nfsidl nfsio 27641 273189 0 0 3 0x14280 nfsidl nfsio 16783 102313 0 0 3 0x14280 nfsidl nfsio 20317 143692 0 0 3 0x14280 nfsidl nfsio 54064 73022 0 0 3 0x14200 bored sosplice 40783 218799 61832 0 3 0x82 nanoslp syz-executor 38431 259361 61832 0 3 0x82 nanoslp syz-executor 9457 407930 61832 0 3 0x82 nanoslp syz-executor 92680 354593 61832 0 3 0x82 nanoslp syz-executor 50219 101679 61832 0 3 0x82 nanoslp syz-executor 46803 390522 61832 0 3 0x2 biowait syz-executor 33378 388619 61832 0 3 0x82 nanoslp syz-executor 42103 93252 61832 0 3 0x82 nanoslp syz-executor 61832 418152 51505 0 3 0x82 kqread syz-executor 51505 237784 54966 0 3 0x10008a sigsusp ksh 54966 493777 60378 0 3 0x98 kqread sshd-session 60378 319487 90532 0 3 0x92 kqread sshd-session 90532 223299 1 0 3 0x88 kqread sshd 37470 92470 55792 74 3 0x1100092 bpf pflogd 55792 139216 1 0 3 0x80 sbwait pflogd 15872 385193 55834 73 3 0x1100090 kqread syslogd 55834 508734 1 0 3 0x100082 sbwait syslogd 27395 474732 1 0 3 0x100080 kqread resolvd 13402 483316 71690 77 3 0x100092 kqread dhcpleased 21676 279765 71690 77 3 0x100092 kqread dhcpleased 71690 301963 1 0 3 0x80 kqread dhcpleased 69130 328342 0 0 3 0x14200 bored smr 29225 82288 0 0 2 0x14200 zerothread 76444 238450 0 0 3 0x14200 aiodoned aiodoned 90318 462376 0 0 3 0x14200 syncer update 61412 72624 0 0 3 0x14200 cleaner cleaner 63179 307224 0 0 3 0x14200 reaper reaper 85523 360327 0 0 3 0x14200 pgdaemon pagedaemon 52991 508265 0 0 3 0x14200 bored viomb 91931 504689 0 0 3 0x40014200 acpi0 acpi0 23196 50615 0 0 3 0x40014200 idle1 61214 159181 0 0 3 0x14200 bored softnet3 45271 454340 0 0 3 0x14200 bored softnet2 98598 141987 0 0 3 0x14200 bored softnet1 9517 44211 0 0 3 0x14200 bored softnet0 84088 227675 0 0 3 0x14200 bored systqmp 31821 425315 0 0 3 0x14200 bored systq 9655 365639 0 0 3 0x14200 tmoslp softclockmp 18496 125336 0 0 3 0x40014200 tmoslp softclock 61599 28989 0 0 3 0x40014200 idle0 1 445453 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks CPU 0: exclusive mutex shmpl r = 0 (0xffffffff835a5a00) #0 witness_lock+0x5bb stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5bb sys/kern/subr_witness.c:1155 #1 mtx_enter_try+0x178 #2 mtx_enter+0x60 sys/kern/kern_lock.c:239 #3 pool_put+0x9f sys/kern/subr_pool.c:797 #4 shm_delete_mapping+0x1ac shm_deallocate_segment sys/kern/sysv_shm.c:153 [inline] #4 shm_delete_mapping+0x1ac sys/kern/sysv_shm.c:174 #5 syscall+0xaf8 mi_syscall sys/sys/syscall_mi.h:178 [inline] #5 syscall+0xaf8 sys/arch/amd64/amd64/trap.c:577 #6 Xsyscall+0x128 Process 75282 (syz-executor) thread 0xffff80002a12b988 (32309) Process 75282 (syz-executor) thread 0xffff80002a12a2c0 (71030) Process 46803 (syz-executor) thread 0xffff80002a03ea38 (390522) ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10209 11265K 11656K 166960K 12582 0 pcb 18 13K 14K 166960K 167 0 rtable 205 7K 8K 166960K 461 0 pf 40 18K 82K 166960K 84 0 ifaddr 42 6K 8K 166960K 67 0 ifgroup 67 2K 3K 166960K 106 0 sysctl 3 0K 0K 166960K 3 0 counters 70 37K 37K 166960K 94 0 ioctlops 0 0K 4K 166960K 1536 0 iov 0 0K 16K 166960K 44 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1427 90K 90K 166960K 1997 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 3 5K 5K 166960K 16 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 0K 166960K 45 0 dirhash 12 2K 2K 166960K 33 0 ACPI 1690 195K 286K 166960K 12468 0 file desc 17 61K 93K 166960K 812 0 sigio 1 0K 0K 166960K 19 0 proc 64 79K 140K 166960K 634 0 subproc 104 6K 6K 166960K 138 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 187 0 in_multi 83 6K 7K 166960K 130 0 ether_multi 1 0K 0K 166960K 3 0 mrt 1 0K 0K 166960K 3 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 85 387K 387K 166960K 85 0 exec 0 0K 1K 166960K 543 0 fusefs mount 1 32K 32K 166960K 1 0 pfkey data 0 0K 0K 166960K 1 0 tdb 3 0K 0K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 258 74K 87K 166960K 9383 0 UVM aobj 23 2K 2K 166960K 29 0 pinsyscall 43 86K 106K 166960K 1896 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 41 0 NDP 15 0K 1K 166960K 46 0 temp 56 6822K 6893K 166960K 35385 0 kqueue 16 26K 30K 166960K 150 0 SYN cache 2 16K 16K 166960K 2 0 ddb{0}> show all pools Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle plcache 128 24 0 0 1 0 1 1 0 8 0 rtpcb 120 114 0 111 2 0 2 2 0 8 1 rtentry 112 146 0 55 4 0 4 4 0 8 0 unpcb 144 770 0 682 7 1 6 6 0 8 2 syncache 336 5 0 5 3 2 1 1 0 8 1 tcpqe 32 2 0 2 1 0 1 1 0 8 1 tcpcb 808 269 0 260 8 0 8 8 0 8 7 arp 120 25 0 9 1 0 1 1 0 8 0 inpcb 336 1068 0 1052 8 0 8 8 0 8 6 nd6 136 33 0 7 1 0 1 1 0 8 0 pkpcb 40 4 0 4 2 1 1 1 0 8 1 kcovpl 48 8 0 0 1 0 1 1 0 8 0 ppxss 1168 8 0 8 1 0 1 1 0 8 1 pffrag 232 5 0 1 1 0 1 1 0 482 0 pffrnode 88 5 0 1 1 0 1 1 0 8 0 pffrent 40 10 0 6 1 0 1 1 0 8 0 pfosfp 40 1428 0 1005 5 0 5 5 0 8 0 pfosfpen 112 1428 0 714 21 0 21 21 0 8 0 pfstitem 24 78 0 13 1 0 1 1 0 8 0 pfstkey 128 78 0 13 3 0 3 3 0 8 0 pfstate 376 78 0 13 7 0 7 7 0 8 0 pfrule 1344 21 0 15 2 0 2 2 0 8 0 art_heap8 4096 3 0 0 3 0 3 3 0 8 0 art_heap4 256 593 0 184 30 1 29 30 0 8 1 art_table 32 596 0 184 4 0 4 4 0 8 0 art_node 16 144 0 64 1 0 1 1 0 8 0 sysvmsgpl 40 11 0 2 1 0 1 1 0 8 0 semapl 112 37 0 27 1 0 1 1 0 8 0 shmpl 112 26 0 6 1 0 1 1 0 8 0 pool(shmpl): free list modified: page 0xfffffd806b841000; item ordinal 0; addr 0xfffffd806b841000 (p 0xfffffd806b841000); offset 0x1c=0xdeafbeac dirhash 1024 32 0 15 3 0 3 3 0 8 0 dino2pl 256 2849 0 1353 95 0 95 95 0 8 0 ffsino 272 2849 0 1353 101 0 101 101 0 8 0 nchpl 144 4009 0 2321 63 0 63 63 0 8 0 uvmvnodes 80 3333 0 0 69 0 69 69 0 8 0 vnodes 216 3333 0 0 186 0 186 186 0 8 0 namei 1024 14244 0 14244 2 0 2 2 0 8 2 percpumem 16 61 0 12 1 0 1 1 0 8 0 kstatmem 264 54 0 24 3 0 3 3 0 8 1 scsiplug 72 2 0 2 1 1 0 1 0 8 0 scxspl 216 13684 0 13683 10 8 2 8 1 8 1 plimitpl 152 113 0 94 1 0 1 1 0 8 0 sigapl 424 1137 0 1066 9 0 9 9 0 8 0 futexpl 64 11135 0 11130 1 0 1 1 0 8 0 knotepl 120 514 0 0 16 0 16 16 0 8 0 kqueuepl 216 226 0 214 2 0 2 2 0 8 1 pipepl 320 236 0 208 6 0 6 6 0 8 3 fdescpl 496 1096 0 1064 5 0 5 5 0 8 0 filepl 152 6798 0 6471 18 0 18 18 0 8 5 lockfpl 104 227 0 223 1 0 1 1 0 8 0 lockfspl 48 94 0 91 1 0 1 1 0 8 0 sessionpl 144 25 0 16 1 0 1 1 0 8 0 pgrppl 48 42 0 25 1 0 1 1 0 8 0 ucredpl 104 898 0 885 1 0 1 1 0 8 0 zombiepl 144 1067 0 1066 1 0 1 1 0 8 0 processpl 1160 1137 0 1066 6 0 6 6 0 8 0 procpl 648 2298 0 2216 8 0 8 8 0 8 0 srpgc 96 2 0 2 1 0 1 1 0 8 1 sosppl 168 4 0 4 1 0 1 1 0 8 1 sockpl 664 1966 0 1860 17 6 11 15 0 8 2 mcl64k 65536 3 0 0 1 0 1 1 0 8 0 mcl12k 12288 2 0 0 1 0 1 1 0 8 0 mcl8k 8192 4 0 0 1 0 1 1 0 8 0 mcl4k 4096 135 0 0 17 0 17 17 0 8 0 mcl2k 2048 21 0 0 3 0 3 3 0 8 0 mtagpl 96 83 0 0 3 0 3 3 0 8 0 mbufpl 256 286 0 0 18 0 18 18 0 8 0 bufpl 280 4581 0 100 321 0 321 321 0 8 0 anonpl 24 242536 0 237042 73 12 61 69 0 185 3 amapchunkpl 152 30674 0 30044 31 1 30 31 0 158 4 amappl16 200 6840 0 6770 26 9 17 23 0 8 6 amappl15 192 11 0 11 1 1 0 1 0 8 0 amappl14 184 123 0 111 1 0 1 1 0 8 0 amappl13 176 20 0 20 1 1 0 1 0 8 0 amappl12 168 1770 0 1739 4 2 2 3 0 8 0 amappl11 160 71 0 57 1 0 1 1 0 8 0 amappl10 152 9 0 9 1 1 0 1 0 8 0 amappl9 144 157 0 157 1 1 0 1 0 8 0 amappl8 136 22 0 19 1 0 1 1 0 8 0 amappl7 128 121 0 109 1 0 1 1 0 8 0 amappl6 120 170 0 169 1 0 1 1 0 8 0 amappl5 112 141 0 126 1 0 1 1 0 8 0 amappl4 104 328 0 310 1 0 1 1 0 8 0 amappl3 96 5567 0 5463 3 0 3 3 0 8 0 amappl2 88 1388 0 1299 4 1 3 3 0 8 0 amappl1 80 9989 0 9362 18 2 16 16 0 8 1 amappl 88 8905 0 8711 5 0 5 5 0 92 0 dma4096 4096 1 0 1 1 1 0 1 0 8 0 dma1024 1024 1 0 0 1 0 1 1 0 8 0 dma256 256 6 0 6 1 1 0 1 0 8 0 dma128 128 253 0 253 1 1 0 1 0 8 0 dma64 64 6 0 6 1 1 0 1 0 8 0 dma32 32 7 0 7 1 1 0 1 0 8 0 dma16 16 19 0 18 1 0 1 1 0 8 0 aobjpl 72 28 0 6 1 0 1 1 0 8 0 pool(aobjpl): free list modified: page 0xfffffd80709fe000; item ordinal 0; addr 0xfffffd80709fe5e8 (p 0xfffffd80709fe000); offset 0xc=0xdead410f uaddrrnd 24 1096 0 1064 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 1096 0 1064 1 0 1 1 0 8 0 vmmpekpl 168 10503 0 10462 3 0 3 3 0 8 0 vmmpepl 168 76128 0 74094 106 3 103 104 0 357 6 vmsppl 448 1095 0 1064 6 2 4 5 0 8 0 rwobjpl 56 28230 0 23811 63 0 63 63 0 8 0 pdppl 4096 2199 0 2128 109 36 73 85 0 8 2 pvpl 32 17277 0 0 140 0 140 140 0 265 0 pmappl 248 1095 0 1064 3 0 3 3 0 8 0 extentpl 40 55 0 38 1 0 1 1 0 8 0 phpool 112 412 0 43 11 0 11 11 0 8 0 ddb{0}> machine ddbcpu 0 Invalid cpu 0 ddb{0}> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:437 panic(ffffffff8307b4ef) at panic+0x1e5 sys/kern/subr_prf.c:198 pool_do_put(ffffffff835a59f0,fffffd806b841000) at pool_do_put+0x1be sys/kern/subr_pool.c:841 pool_put(ffffffff835a59f0,fffffd806b841000) at pool_put+0xb3 sys/kern/subr_pool.c:799 shm_delete_mapping(fffffd806bf86aa0,ffff8000012b8008) at shm_delete_mapping+0x1ac shm_deallocate_segment sys/kern/sysv_shm.c:153 [inline] shm_delete_mapping(fffffd806bf86aa0,ffff8000012b8008) at shm_delete_mapping+0x1ac sys/kern/sysv_shm.c:174 syscall(ffff8000359b0770) at syscall+0xaf8 mi_syscall sys/sys/syscall_mi.h:178 [inline] syscall(ffff8000359b0770) at syscall+0xaf8 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xbc5efb2e410, count: -7 ddb{0}> machine ddbcpu 1 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp x86_ipi_db(ffff800029b7bff0) at x86_ipi_db+0x27 sys/arch/amd64/amd64/db_interface.c:393 x86_ipi_handler() at x86_ipi_handler+0xd9 sys/arch/amd64/amd64/ipi.c:106 Xresume_lapic_ipi() at Xresume_lapic_ipi+0x27 end of kernel end trace frame: 0x76ec6ae30080, count: 12 ddb{1}> trace x86_ipi_db(ffff800029b7bff0) at x86_ipi_db+0x27 sys/arch/amd64/amd64/db_interface.c:393 x86_ipi_handler() at x86_ipi_handler+0xd9 sys/arch/amd64/amd64/ipi.c:106 Xresume_lapic_ipi() at Xresume_lapic_ipi+0x27 end of kernel end trace frame: 0x76ec6ae30080, count: -3