panic: pool_do_get: shmpl free list modified: page 0xfffff9006c628000; item addr 0xfffff9006c628e10; offset 0x40=0x6a2ea621 Stopped at db_enter+0x25: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND *366921 28133 0 0 0x4000000 0 syz-executor db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff8347aa63) at panic+0x1cf sys/kern/subr_prf.c:198 pool_do_get(ffffffff83a7a180,1,ffff80003c924f58) at pool_do_get+0x5bc pool_get(ffffffff83a7a180,1) at pool_get+0x11a sys/kern/subr_pool.c:-1 shmget_allocate_segment(ffff80002f4b07e0,ffff80003c9251a0,0,ffff80003c9250f0) at shmget_allocate_segment+0x1af sys/kern/sysv_shm.c:-1 sys_shmget(ffff80002f4b07e0,ffff80003c9251a0,ffff80003c9250f0) at sys_shmget+0x195 sys/kern/sysv_shm.c:501 syscall(ffff80003c9251a0) at syscall+0x962 mi_syscall sys/sys/syscall_mi.h:-1 [inline] syscall(ffff80003c9251a0) at syscall+0x962 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xec24e660070, count: 7 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> ddb> set $lines = 0 ddb> set $maxwidth = 0 ddb> show panic *cpu0: pool_do_get: shmpl free list modified: page 0xfffff9006c628000; item addr 0xfffff9006c628e10; offset 0x40=0x6a2ea621 ddb> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff8347aa63) at panic+0x1cf sys/kern/subr_prf.c:198 pool_do_get(ffffffff83a7a180,1,ffff80003c924f58) at pool_do_get+0x5bc pool_get(ffffffff83a7a180,1) at pool_get+0x11a sys/kern/subr_pool.c:-1 shmget_allocate_segment(ffff80002f4b07e0,ffff80003c9251a0,0,ffff80003c9250f0) at shmget_allocate_segment+0x1af sys/kern/sysv_shm.c:-1 sys_shmget(ffff80002f4b07e0,ffff80003c9251a0,ffff80003c9250f0) at sys_shmget+0x195 sys/kern/sysv_shm.c:501 syscall(ffff80003c9251a0) at syscall+0x962 mi_syscall sys/sys/syscall_mi.h:-1 [inline] syscall(ffff80003c9251a0) at syscall+0x962 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xec24e660070, count: -8 ddb> show registers rdi 0 rsi 0x1 rbp 0xffff80003c924dc0 rbx 0xfffff9006c628e10 rdx 0xffff8000015b1500 rcx 0 rax 0xffff80002f4b07e0 r8 0x101010101010101 r9 0x8080808080808080 r10 0x625db871ac047475 r11 0xa04f338396785d3b r12 0 r13 0xffffffff83a7a180 shm_pool r14 0 r15 0x1 rip 0xffffffff82440cf5 db_enter+0x25 cs 0x8 rflags 0x246 rsp 0xffff80003c924db0 ss 0x10 db_enter+0x25: addq $0x8,%rsp ddb> show proc PROC (syz-executor) tid=366921 pid=28133 tcnt=2 stat=onproc flags process=0 proc=4000000 runpri=32, usrpri=82, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff80002f4b1a08,0xffff80002d0a8568 process=0xffff8000ffffa418 user=0xffff80003c920000, vmspace=0xfffff9007e703018 estcpu=32, cpticks=1, pctcpu=0.0, user=0, sys=1, intr=0 ddb> ps PID TID PPID UID S FLAGS WAIT COMMAND 8231 124620 63183 0 2 0 syz-executor 8231 354264 63183 0 3 0x4000080 fsleep syz-executor 28133 456656 25911 0 2 0 syz-executor *28133 366921 25911 0 7 0x4000000 syz-executor 80107 127318 64043 0 2 0 syz-executor 80107 378699 64043 0 3 0x4000080 fsleep syz-executor 1025 36652 58864 0 2 0 syz-executor 1025 500329 58864 0 3 0x4000080 fsleep syz-executor 49452 240987 54423 60929 2 0x10 syz-executor 49452 428392 54423 60929 3 0x4000090 fsleep syz-executor 49452 202643 54423 60929 3 0x4000090 fsleep syz-executor 88655 14999 39226 0 2 0 syz-executor 88655 376887 39226 0 3 0x4000080 fsleep syz-executor 88655 483271 39226 0 3 0x4000080 fsleep syz-executor 88655 374565 39226 0 3 0x4000080 fsleep syz-executor 8894 153842 88503 0 2 0xc80 syz-executor 8894 177741 88503 0 2 0x4000000 syz-executor 58864 477024 93044 0 2 0xc82 syz-executor 58137 22230 93044 0 3 0x82 wait syz-executor 64043 253262 93044 0 2 0xc82 syz-executor 88503 422467 93044 0 2 0xc82 syz-executor 54423 324928 93044 0 2 0xc82 syz-executor 25911 56731 93044 0 2 0xc82 syz-executor 39226 196719 93044 0 2 0xc82 syz-executor 63183 196077 93044 0 3 0x82 nanoslp syz-executor 93044 312104 34160 0 3 0x82 kqread syz-executor 34160 1967 61452 0 3 0x10008a sigsusp ksh 61452 172029 9569 0 3 0x98 kqread sshd-session 9569 428988 45129 0 3 0x92 kqread sshd-session 80896 472467 1 0 3 0x100083 ttyin getty 45129 445878 1 0 3 0x88 kqread sshd 83392 121375 31330 73 3 0x1100090 kqread syslogd 31330 328618 1 0 3 0x100082 sbwait syslogd 73440 167564 1 0 3 0x100080 kqread resolvd 70185 208293 89106 77 3 0x100092 kqread dhcpleased 34911 310351 89106 77 3 0x100092 kqread dhcpleased 89106 421973 1 0 3 0x80 kqread dhcpleased 73977 248172 0 0 3 0x14200 bored smr 64976 2120 0 0 2 0x14200 zerothread 28656 364827 0 0 3 0x14200 aiodoned aiodoned 9634 271955 0 0 3 0x14200 syncer update 83832 133644 0 0 3 0x14200 cleaner cleaner 98471 261218 0 0 3 0x14200 reaper reaper 24965 114330 0 0 3 0x14200 pgdaemon pagedaemon 78189 194518 0 0 3 0x14200 bored viomb 61848 258078 0 0 3 0x40014200 acpi0 acpi0 2668 279883 0 0 3 0x14200 bored softnet0 36188 11752 0 0 3 0x14200 bored systqmp 11090 27030 0 0 3 0x14200 bored systq 37297 172896 0 0 3 0x40014200 tmoslp softclock 65483 481584 0 0 3 0x40014200 idle0 1 521184 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb> show all locks No such command ddb> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 11047 12145K 12515K 166960K 12463 0 pcb 18 13K 14K 166960K 122 0 rtable 230 7K 8K 166960K 418 0 pf 28 12K 16K 166960K 62 0 ifaddr 38 6K 7K 166960K 58 0 ifgroup 46 2K 2K 166960K 77 0 sysctl 1 1K 9K 166960K 6 0 counters 32 17K 18K 166960K 48 0 ioctlops 0 0K 4K 166960K 218 0 iov 0 0K 12K 166960K 12 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1301 82K 82K 166960K 1690 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 9K 166960K 9 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 0K 166960K 17 0 dirhash 12 2K 2K 166960K 18 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 18 65K 244K 166960K 443 0 sigio 0 0K 0K 166960K 14 0 proc 60 59K 91K 166960K 517 0 subproc 72 4K 4K 166960K 72 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 36 0 in_multi 88 6K 7K 166960K 107 0 ether_multi 1 0K 0K 166960K 2 0 mrt 1 0K 0K 166960K 19 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 97 440K 440K 166960K 97 0 exec 0 0K 1K 166960K 398 0 fusefs mount 1 32K 32K 166960K 1 0 pfkey data 0 0K 0K 166960K 2 0 tdb 3 0K 0K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 229 143K 152K 166960K 5758 0 UVM aobj 75 3K 3K 166960K 78 0 pinsyscall 39 78K 92K 166960K 1533 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 6 0 NDP 10 0K 2K 166960K 39 0 temp 40 9107K 9170K 166960K 22593 0 kqueue 13 20K 32K 166960K 81 0 SYN cache 2 16K 16K 166960K 2 0 ddb> show all pools Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle rtpcb 120 126 0 123 3 0 3 3 0 8 2 rtentry 136 126 0 24 4 0 4 4 0 8 0 unpcb 144 149 0 131 1 0 1 1 0 8 0 syncache 336 7 0 7 2 1 1 1 0 8 1 tcpcb 736 79 0 75 2 0 2 2 0 8 1 arp 96 22 0 6 1 0 1 1 0 8 0 ipq 40 3 0 0 1 0 1 1 0 8 0 ipqe 40 3 0 0 1 0 1 1 0 8 0 inpcb 328 388 0 378 7 3 4 4 0 8 2 ip6q 72 2 0 2 1 0 1 1 0 8 1 ip6af 40 4 0 4 1 0 1 1 0 8 1 nd6 112 29 0 5 1 0 1 1 0 8 0 pkpcb 40 4 0 4 1 0 1 1 0 8 1 kcovpl 48 8 0 0 1 0 1 1 0 8 0 ppxss 1072 14 0 14 1 0 1 1 0 8 1 pfrktable 1344 3 0 3 1 1 0 1 0 8 0 pfanchor 1288 1 0 1 1 1 0 1 0 8 0 pfrule 1360 1 0 1 1 1 0 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 496 0 78 31 0 31 31 0 8 2 art_table 40 497 0 78 5 0 5 5 0 8 0 art_node 32 126 0 33 1 0 1 1 0 8 0 sysvmsgpl 40 2 0 1 1 0 1 1 0 8 0 semupl 112 1 0 1 1 0 1 1 0 8 1 semapl 72 14 0 4 1 0 1 1 0 8 0 shmpl 112 75 0 3 3 0 3 3 0 8 0 pool(0xffffffff83a7a180:shmpl): page inconsistency: page 0xfffff9006c628000; 32 on list, 2 missing, 35 items per page dirhash 1024 21 0 4 3 0 3 3 0 8 0 dino2pl 256 2165 0 708 92 0 92 92 0 8 0 ffsino 256 2165 0 708 92 0 92 92 0 8 0 nchpl 144 2774 0 1075 64 0 64 64 0 8 0 vnodes 216 2448 0 0 136 0 136 136 0 8 0 namei 1024 8730 0 8730 1 0 1 1 0 8 1 pfiaddrpl 120 1 0 1 1 1 0 1 0 8 0 kstatmem 264 47 0 26 2 0 2 2 0 8 0 scsiplug 72 1 0 1 1 0 1 1 0 8 1 scxspl 216 9201 0 9201 11 3 8 8 1 8 8 plimitpl 152 72 0 56 1 0 1 1 0 8 0 sigapl 424 726 0 683 6 1 5 6 0 8 0 knotepl 120 15658 0 15611 10 0 10 10 0 8 8 kqueuepl 184 175 0 166 4 0 4 4 0 8 3 pipepl 304 243 0 216 10 0 10 10 0 8 7 fdescpl 448 713 0 683 5 1 4 5 0 8 0 filepl 120 3869 0 3640 15 1 14 14 0 8 5 lockfpl 104 233 0 231 2 1 1 2 0 8 0 lockfspl 48 67 0 65 1 0 1 1 0 8 0 sessionpl 144 29 0 21 1 0 1 1 0 8 0 pgrppl 48 40 0 24 1 0 1 1 0 8 0 ucredpl 104 498 0 486 1 0 1 1 0 8 0 zombiepl 144 894 0 893 1 0 1 1 0 8 0 processpl 1152 726 0 683 4 0 4 4 0 8 0 procpl 664 1276 0 1223 6 0 6 6 0 8 1 sockpl 552 680 0 649 10 2 8 8 0 8 5 mcl64k 65536 19 0 19 2 1 1 1 0 8 1 mcl16k 16384 1 0 1 1 1 0 1 0 8 0 mcl9k128 9344 1 0 1 1 0 1 1 0 8 1 mcl8k 8192 8 0 8 2 1 1 1 0 8 1 mcl4k 4096 2952 0 2901 15 7 8 14 0 8 1 mcl2k 2048 389 0 385 1 0 1 1 0 8 0 mtagpl 96 13 0 5 1 0 1 1 0 8 0 mbufpl 256 6995 0 6817 15 1 14 14 0 8 0 bufpl 272 2969 0 103 192 0 192 192 0 8 0 anonpl 24 111202 0 107714 43 11 32 32 0 186 9 amapchunkpl 152 18138 0 17641 45 10 35 35 0 158 15 amappl16 200 1382 0 1337 5 2 3 4 0 8 0 amappl15 192 26 0 26 1 1 0 1 0 8 0 amappl14 184 412 0 411 1 0 1 1 0 8 0 amappl13 176 128 0 118 1 0 1 1 0 8 0 amappl12 168 948 0 919 2 0 2 2 0 8 0 amappl11 160 7 0 7 1 1 0 1 0 8 0 amappl10 152 59 0 49 1 0 1 1 0 8 0 amappl9 144 273 0 273 1 1 0 1 0 8 0 amappl8 136 92 0 90 1 0 1 1 0 8 0 amappl7 128 168 0 156 1 0 1 1 0 8 0 amappl6 120 152 0 149 1 0 1 1 0 8 0 amappl5 112 91 0 83 1 0 1 1 0 8 0 amappl4 104 257 0 242 1 0 1 1 0 8 0 amappl3 96 3445 0 3326 4 0 4 4 0 8 0 amappl2 88 531 0 474 2 0 2 2 0 8 0 amappl1 80 11282 0 10733 12 0 12 12 0 8 0 amappl 88 5015 0 4848 5 0 5 5 0 92 0 uvmvnodes 80 108 0 0 3 0 3 3 0 8 0 dma65536 65536 1 0 1 1 0 1 1 0 8 1 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 8 0 8 2 1 1 1 0 8 1 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 77 0 3 2 0 2 2 0 8 0 uaddrrnd 24 713 0 683 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 713 0 683 1 0 1 1 0 8 0 vmmpekpl 168 8057 0 8027 2 0 2 2 0 8 0 vmmpepl 168 52672 0 50821 83 2 81 81 0 357 0 vmsppl 368 712 0 683 4 1 3 4 0 8 0 rwobjpl 40 16992 0 15936 11 0 11 11 0 8 0 pdppl 4096 1432 0 1366 100 34 66 78 0 8 0 pvpl 32 315019 0 305343 110 11 99 99 0 265 17 pmappl 216 712 0 683 2 0 2 2 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 567 0 51 15 0 15 15 0 8 0 ddb> machine ddbcpu 0 No such command ddb> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff8347aa63) at panic+0x1cf sys/kern/subr_prf.c:198 pool_do_get(ffffffff83a7a180,1,ffff80003c924f58) at pool_do_get+0x5bc pool_get(ffffffff83a7a180,1) at pool_get+0x11a sys/kern/subr_pool.c:-1 shmget_allocate_segment(ffff80002f4b07e0,ffff80003c9251a0,0,ffff80003c9250f0) at shmget_allocate_segment+0x1af sys/kern/sysv_shm.c:-1 sys_shmget(ffff80002f4b07e0,ffff80003c9251a0,ffff80003c9250f0) at sys_shmget+0x195 sys/kern/sysv_shm.c:501 syscall(ffff80003c9251a0) at syscall+0x962 mi_syscall sys/sys/syscall_mi.h:-1 [inline] syscall(ffff80003c9251a0) at syscall+0x962 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xec24e660070, count: -8 ddb> machine ddbcpu 1 No such command ddb> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff8347aa63) at panic+0x1cf sys/kern/subr_prf.c:198 pool_do_get(ffffffff83a7a180,1,ffff80003c924f58) at pool_do_get+0x5bc pool_get(ffffffff83a7a180,1) at pool_get+0x11a sys/kern/subr_pool.c:-1 shmget_allocate_segment(ffff80002f4b07e0,ffff80003c9251a0,0,ffff80003c9250f0) at shmget_allocate_segment+0x1af sys/kern/sysv_shm.c:-1 sys_shmget(ffff80002f4b07e0,ffff80003c9251a0,ffff80003c9250f0) at sys_shmget+0x195 sys/kern/sysv_shm.c:501 syscall(ffff80003c9251a0) at syscall+0x962 mi_syscall sys/sys/syscall_mi.h:-1 [inline] syscall(ffff80003c9251a0) at syscall+0x962 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xec24e660070, count: -8