panic: pool_do_get: shmpl free list modified: page 0xfffffd8068381000; item addr 0xfffffd8068381a10; offset 0x40=0x682fb7a2 Stopped at db_enter+0x25: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND * 19230 71380 0 0 0x4000000 1K syz-executor 449266 50066 0 0x14000 0x200 0 reaper db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff833cda51) at panic+0x1e5 sys/kern/subr_prf.c:198 pool_do_get(ffffffff83a04220,1,ffff80003c4210e8) at pool_do_get+0x5ea sys/kern/subr_pool.c:-1 pool_get(ffffffff83a04220,1) at pool_get+0x149 sys/kern/subr_pool.c:-1 shmget_allocate_segment(ffff80003c4162c8,ffff80003c421340,73,ffff80003c421290) at shmget_allocate_segment+0x1a7 sys/kern/sysv_shm.c:-1 sys_shmget(ffff80003c4162c8,ffff80003c421340,ffff80003c421290) at sys_shmget+0x1b2 sys/kern/sysv_shm.c:482 syscall(ffff80003c421340) at syscall+0xb08 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c421340) at syscall+0xb08 sys/arch/amd64/amd64/trap.c:579 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x63f2e63cc10, 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{1}> ddb{1}> set $lines = 0 ddb{1}> set $maxwidth = 0 ddb{1}> show panic *cpu1: pool_do_get: shmpl free list modified: page 0xfffffd8068381000; item addr 0xfffffd8068381a10; offset 0x40=0x682fb7a2 ddb{1}> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff833cda51) at panic+0x1e5 sys/kern/subr_prf.c:198 pool_do_get(ffffffff83a04220,1,ffff80003c4210e8) at pool_do_get+0x5ea sys/kern/subr_pool.c:-1 pool_get(ffffffff83a04220,1) at pool_get+0x149 sys/kern/subr_pool.c:-1 shmget_allocate_segment(ffff80003c4162c8,ffff80003c421340,73,ffff80003c421290) at shmget_allocate_segment+0x1a7 sys/kern/sysv_shm.c:-1 sys_shmget(ffff80003c4162c8,ffff80003c421340,ffff80003c421290) at sys_shmget+0x1b2 sys/kern/sysv_shm.c:482 syscall(ffff80003c421340) at syscall+0xb08 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c421340) at syscall+0xb08 sys/arch/amd64/amd64/trap.c:579 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x63f2e63cc10, count: -8 ddb{1}> show registers rdi 0 rsi 0x1 rbp 0xffff80003c420f20 rbx 0xffff8000299dedd7 rdx 0xffff800001457c80 rcx 0xffff80003c4162c8 rax 0xffff8000299ddff0 r8 0x101010101010101 r9 0x8080808080808080 r10 0x44984f6b12520555 r11 0x6c4b4ba09f92124b r12 0xffff8000299debd8 r13 0 r14 0 r15 0x1 rip 0xffffffff810e22e5 db_enter+0x25 cs 0x8 rflags 0x246 rsp 0xffff80003c420f10 ss 0x10 db_enter+0x25: addq $0x8,%rsp ddb{1}> show proc PROC (syz-executor) tid=19230 pid=71380 tcnt=2 stat=onproc flags process=0 proc=4000000 runpri=50, usrpri=50, slppri=17, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff80003c4167e8,0xffffffff83a0bcc8 process=0xffff80003c41b408 user=0xffff80003c41c000, vmspace=0xfffffd806a9d13e0 estcpu=36, cpticks=1, pctcpu=0.0, user=0, sys=1, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 71380 26132 37980 0 2 0 syz-executor *71380 19230 37980 0 7 0x4000000 syz-executor 90135 95012 50610 0 2 0 syz-executor 90135 44595 50610 0 3 0x4000080 fsleep syz-executor 90135 79887 50610 0 2 0x4000000 syz-executor 65300 505821 68981 0 2 0 syz-executor 65300 28161 68981 0 3 0x4000080 pipewr syz-executor 89764 318859 88119 0 2 0 syz-executor 89764 73160 88119 0 3 0x4000080 fsleep syz-executor 89764 404946 88119 0 3 0x4000080 fsleep syz-executor 69488 370170 58589 0 2 0 syz-executor 69488 187641 58589 0 3 0x4000080 fsleep syz-executor 918 37721 16418 0 2 0 syz-executor 918 40469 16418 0 3 0x4000080 fsleep syz-executor 918 113665 16418 0 3 0x4000080 fsleep syz-executor 918 315969 16418 0 3 0x4000080 fsleep syz-executor 34761 456520 34577 0 3 0x82 wait syz-executor 58869 71935 0 0 3 0x14280 nfsidl nfsio 48507 48431 0 0 3 0x14280 nfsidl nfsio 60235 246511 0 0 3 0x14280 nfsidl nfsio 89049 173882 0 0 3 0x14280 nfsidl nfsio 65567 356016 0 0 3 0x14280 nfsidl nfsio 64539 72473 0 0 3 0x14280 nfsidl nfsio 74597 46199 0 0 3 0x14280 nfsidl nfsio 19669 230322 0 0 3 0x14280 nfsidl nfsio 11762 478625 0 0 3 0x14280 nfsidl nfsio 89600 210875 0 0 3 0x14280 nfsidl nfsio 27873 494882 0 0 3 0x14280 nfsidl nfsio 3084 170723 0 0 3 0x14280 nfsidl nfsio 98230 523212 0 0 3 0x14280 nfsidl nfsio 99471 299374 0 0 3 0x14280 nfsidl nfsio 23357 107930 0 0 3 0x14280 nfsidl nfsio 91544 3257 0 0 3 0x14280 nfsidl nfsio 704 47986 0 0 3 0x14280 nfsidl nfsio 62151 6911 0 0 3 0x14280 nfsidl nfsio 20160 69154 0 0 3 0x14280 nfsidl nfsio 28510 21849 0 0 3 0x14280 nfsidl nfsio 85015 331390 1 0 3 0x100083 ttyin getty 73283 517576 0 0 3 0x14200 bored sosplice 16418 454035 34577 0 3 0x82 nanoslp syz-executor 50610 112548 34577 0 3 0x82 nanoslp syz-executor 37980 469723 34577 0 3 0x82 nanoslp syz-executor 58589 428505 34577 0 3 0x82 nanoslp syz-executor 54203 12791 34577 0 2 0x2 syz-executor 88119 181182 34577 0 3 0x82 nanoslp syz-executor 68981 432572 34577 0 3 0x82 nanoslp syz-executor 34577 248085 13470 0 3 0x82 kqread syz-executor 13470 256098 36507 0 3 0x10008a sigsusp ksh 36507 260292 75301 0 3 0x98 kqread sshd-session 75301 82632 67200 0 3 0x92 kqread sshd-session 67200 61771 1 0 3 0x88 kqread sshd 29226 497379 89978 74 3 0x1100092 bpf pflogd 89978 111476 1 0 3 0x80 sbwait pflogd 90769 6441 31996 73 3 0x1100090 kqread syslogd 31996 520673 1 0 3 0x100082 sbwait syslogd 93885 43186 1 0 3 0x100080 kqread resolvd 50320 358894 29774 77 3 0x100092 kqread dhcpleased 26962 232276 29774 77 3 0x100092 kqread dhcpleased 29774 154009 1 0 3 0x80 kqread dhcpleased 68251 282893 0 0 3 0x14200 bored smr 83025 480949 0 0 2 0x14200 zerothread 20991 133605 0 0 3 0x14200 aiodoned aiodoned 90404 120694 0 0 3 0x14200 syncer update 3049 312173 0 0 3 0x14200 cleaner cleaner 50066 449266 0 0 7 0x14200 reaper 38103 312986 0 0 3 0x14200 pgdaemon pagedaemon 21985 341641 0 0 3 0x14200 bored viomb 68684 65503 0 0 3 0x40014200 acpi0 acpi0 51616 425653 0 0 3 0x40014200 idle1 60726 425095 0 0 3 0x14200 bored softnet3 29292 136994 0 0 3 0x14200 bored softnet2 65087 234938 0 0 3 0x14200 bored softnet1 67005 96358 0 0 3 0x14200 bored softnet0 25213 342463 0 0 3 0x14200 bored systqmp 62603 159681 0 0 3 0x14200 bored systq 94310 109086 0 0 3 0x14200 tmoslp softclockmp 16731 146950 0 0 3 0x40014200 tmoslp softclock 2325 265891 0 0 3 0x40014200 idle0 1 405493 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks CPU 0: exclusive mutex &uvm.fpageqlock r = 0 (0xffffffff838c4838) #0 witness_lock+0x5bb stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5bb sys/kern/subr_witness.c:1160 #1 mtx_enter_try+0x1ad sys/kern/kern_lock.c:295 #2 mtx_enter+0x62 sys/kern/kern_lock.c:252 #3 uvm_pmr_freepages+0x1a8 sys/uvm/uvm_pmemrange.c:1323 #4 uvm_anfree_list+0x1e3 sys/uvm/uvm_anon.c:120 #5 amap_wipeout+0x248 sys/uvm/uvm_amap.c:502 #6 uvm_unmap_detach+0x8a sys/uvm/uvm_map.c:1353 #7 uvm_map_teardown+0x358 sys/uvm/uvm_map.c:2516 #8 uvmspace_free+0xcd sys/uvm/uvm_map.c:3420 #9 reaper+0x213 sys/kern/kern_exit.c:490 #10 proc_trampoline+0x10 CPU 1: exclusive mutex shmpl r = 0 (0xffffffff83a04238) #0 witness_lock+0x5bb stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5bb sys/kern/subr_witness.c:1160 #1 mtx_enter_try+0x1ad sys/kern/kern_lock.c:295 #2 mtx_enter+0x62 sys/kern/kern_lock.c:252 #3 pool_get+0x10b sys/kern/subr_pool.c:578 #4 shmget_allocate_segment+0x1a7 sys/kern/sysv_shm.c:-1 #5 sys_shmget+0x1b2 sys/kern/sysv_shm.c:482 #6 syscall+0xb08 mi_syscall sys/sys/syscall_mi.h:176 [inline] #6 syscall+0xb08 sys/arch/amd64/amd64/trap.c:579 #7 Xsyscall+0x128 Process 71380 (syz-executor) thread 0xffff80003c4162c8 (19230) Process 50066 (reaper) thread 0xffff8000ffffccd8 (449266) ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10206 11044K 11489K 166960K 11958 0 pcb 17 13K 14K 166960K 180 0 rtable 220 7K 8K 166960K 563 0 pf 35 17K 19K 166960K 89 0 ifaddr 39 6K 7K 166960K 82 0 ifgroup 55 2K 2K 166960K 109 0 sysctl 4 1K 9K 166960K 11 0 counters 68 36K 37K 166960K 116 0 ioctlops 0 0K 4K 166960K 1536 0 iov 0 0K 14K 166960K 87 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1403 88K 89K 166960K 1960 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 3 5K 5K 166960K 6 0 VM map 2 1K 1K 166960K 2 0 sem 13 5K 5K 166960K 25 0 dirhash 12 2K 2K 166960K 18 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 16 57K 110K 166960K 625 0 sigio 0 0K 0K 166960K 14 0 proc 72 91K 140K 166960K 733 0 subproc 72 4K 4K 166960K 126 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 41 0 in_multi 84 6K 7K 166960K 167 0 ether_multi 1 0K 0K 166960K 2 0 mrt 0 0K 0K 166960K 1 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 79 360K 360K 166960K 79 0 exec 0 0K 1K 166960K 516 0 fusefs mount 1 32K 32K 166960K 1 0 tdb 3 0K 0K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 232 159K 176K 166960K 7127 0 UVM aobj 8 2K 3K 166960K 11 0 pinsyscall 41 82K 102K 166960K 1866 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 24 0 NDP 12 0K 1K 166960K 55 0 temp 45 8676K 8798K 166960K 22243 0 kqueue 14 20K 31K 166960K 102 0 SYN cache 2 16K 16K 166960K 2 0 ddb{1}> show all pools Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle plcache 128 26 0 0 1 0 1 1 0 8 0 rtpcb 120 135 0 132 3 2 1 3 0 8 0 rtentry 176 184 0 85 6 0 6 6 0 8 0 unpcb 144 306 0 285 4 3 1 4 0 8 0 syncache 336 6 0 6 2 2 0 1 0 8 0 tcpcb 808 325 0 320 12 1 11 11 0 8 10 arp 128 32 0 15 1 0 1 1 0 8 0 inpcb 384 692 0 683 8 0 8 8 0 8 6 nd6 144 42 0 20 1 0 1 1 0 8 0 pkpcb 40 4 0 4 2 1 1 1 0 8 1 kcovpl 48 14 0 6 1 0 1 1 0 8 0 ppxss 1192 15 0 15 1 0 1 1 0 8 1 pppxif 1504 3 0 3 1 0 1 1 0 8 1 pffrag 232 2 0 0 1 0 1 1 0 482 0 pffrnode 88 2 0 0 1 0 1 1 0 8 0 pffrent 40 3 0 1 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 41 0 12 1 0 1 1 0 8 0 pfstkey 128 41 0 12 2 0 2 2 0 8 0 pfstate 384 41 0 12 4 0 4 4 0 8 0 pfrule 1344 21 0 16 2 1 1 2 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 716 0 319 29 1 28 29 0 8 0 art_table 32 717 0 319 4 0 4 4 0 8 0 art_node 16 181 0 92 1 0 1 1 0 8 0 sysvmsgpl 40 4 0 4 2 1 1 1 0 8 1 semupl 112 2 0 2 1 1 0 1 0 8 0 semapl 112 21 0 10 1 0 1 1 0 8 0 shmpl 112 8 0 3 1 0 1 1 0 8 0 pool(0xffffffff83a04220:shmpl): page inconsistency: page 0xfffffd8068381000; 29 on list, 5 missing, 35 items per page dirhash 1024 21 0 4 3 0 3 3 0 8 0 dino2pl 256 2449 0 938 95 0 95 95 0 8 0 ffsino 288 2449 0 938 109 0 109 109 0 8 0 nchpl 144 3227 0 1515 64 0 64 64 0 8 0 rtmask 32 4 0 4 1 1 0 1 0 8 0 uvmvnodes 80 2863 0 0 59 0 59 59 0 8 0 vnodes 216 2863 0 0 160 0 160 160 0 8 0 namei 1024 10704 0 10704 1 0 1 1 0 8 1 percpumem 16 73 0 24 1 0 1 1 0 8 0 kstatmem 264 60 0 34 2 0 2 2 0 8 0 scsiplug 72 1 0 1 1 1 0 1 0 8 0 scxspl 216 9833 0 9833 11 3 8 8 1 8 8 plimitpl 152 208 0 189 1 0 1 1 0 8 0 sigapl 424 933 0 863 10 1 9 9 0 8 0 knotepl 120 597 0 0 19 0 19 19 0 8 0 kqueuepl 224 177 0 167 3 2 1 3 0 8 0 pipepl 336 193 0 165 6 3 3 6 0 8 0 fdescpl 520 894 0 864 3 0 3 3 0 8 0 filepl 160 4670 0 4452 16 2 14 16 0 8 4 lockfpl 104 124 0 122 1 0 1 1 0 8 0 lockfspl 48 57 0 55 1 0 1 1 0 8 0 sessionpl 144 32 0 23 1 0 1 1 0 8 0 pgrppl 48 50 0 33 1 0 1 1 0 8 0 ucredpl 104 816 0 802 1 0 1 1 0 8 0 zombiepl 144 864 0 863 1 0 1 1 0 8 0 processpl 1208 933 0 863 6 0 6 6 0 8 0 procpl 656 1609 0 1529 8 0 8 8 0 8 1 srpgc 96 2 0 2 1 1 0 1 0 8 0 sosppl 168 2 0 2 1 1 0 1 0 8 0 sockpl 728 1146 0 1114 14 5 9 10 0 8 5 mcl64k 65536 5 0 0 1 0 1 1 0 8 0 mcl16k 16384 5 0 0 1 0 1 1 0 8 0 mcl12k 12288 1 0 0 1 0 1 1 0 8 0 mcl9k 9216 1 0 0 1 0 1 1 0 8 0 mcl8k 8192 1 0 0 1 0 1 1 0 8 0 mcl4k 4096 115 0 0 15 0 15 15 0 8 0 mcl2k 2048 29 0 0 4 0 4 4 0 8 0 mtagpl 96 14 0 0 1 0 1 1 0 8 0 mbufpl 256 310 0 0 20 0 20 20 0 8 0 bufpl 280 3162 0 129 217 0 217 217 0 8 0 anonpl 32 10368 0 0 84 0 84 84 0 246 0 amapchunkpl 152 22678 0 22175 28 2 26 27 0 158 4 amappl16 200 2629 0 2596 17 6 11 14 0 8 8 amappl15 192 6 0 6 1 1 0 1 0 8 0 amappl14 184 128 0 116 1 0 1 1 0 8 0 amappl13 176 5 0 5 2 2 0 1 0 8 0 amappl12 168 1662 0 1632 4 1 3 3 0 8 0 amappl11 160 50 0 36 1 0 1 1 0 8 0 amappl10 152 7 0 7 1 1 0 1 0 8 0 amappl9 144 246 0 245 1 0 1 1 0 8 0 amappl8 136 28 0 25 1 0 1 1 0 8 0 amappl7 128 120 0 108 1 0 1 1 0 8 0 amappl6 120 235 0 232 1 0 1 1 0 8 0 amappl5 112 249 0 240 1 0 1 1 0 8 0 amappl4 104 352 0 328 1 0 1 1 0 8 0 amappl3 96 4157 0 4052 5 1 4 4 0 8 0 amappl2 88 735 0 671 2 0 2 2 0 8 0 amappl1 80 11247 0 10642 16 0 16 16 0 8 0 amappl 88 6272 0 6111 5 0 5 5 0 92 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 6 0 6 1 1 0 1 0 8 0 dma128 128 253 0 253 1 1 0 1 0 8 0 dma64 64 7 0 7 2 1 1 1 0 8 1 dma32 32 7 0 7 1 1 0 1 0 8 0 dma16 16 18 0 17 1 0 1 1 0 8 0 aobjpl 72 10 0 3 1 0 1 1 0 8 0 uaddrrnd 24 894 0 864 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 894 0 864 1 0 1 1 0 8 0 vmmpekpl 168 8973 0 8927 3 0 3 3 0 8 0 vmmpepl 168 62563 0 60629 98 0 98 98 0 357 10 vmsppl 480 893 0 864 5 0 5 5 0 8 0 rwobjpl 72 21845 0 18043 70 0 70 70 0 8 0 pdppl 4096 1795 0 1728 115 42 73 85 0 8 6 pvpl 32 16426 0 0 133 0 133 133 0 265 0 pmappl 256 893 0 864 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 421 0 51 11 0 11 11 0 8 0 ddb{1}> machine ddbcpu 0