panic: pool_do_get: shmpl free list modified: page 0xfffffd806bec9000; item addr 0xfffffd806bec9700; offset 0x0=0x0 != 0xcdfa046375e46c65 Stopped at db_enter+0x25: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND *387534 7152 -1 0x10 0x4000000 0 syz-executor db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:437 panic(ffffffff82fe38ac) at panic+0x1cf sys/kern/subr_prf.c:198 pool_do_get(ffffffff83598b90,1,ffff8000325f58bc) at pool_do_get+0x57e pool_get(ffffffff83598b90,1) at pool_get+0xf0 shmget_allocate_segment(ffff80003761d1d8,ffff8000325f5b10,182,ffff8000325f5a60) at shmget_allocate_segment+0x1a7 sys_shmget(ffff80003761d1d8,ffff8000325f5b10,ffff8000325f5a60) at sys_shmget+0x1b2 sys/kern/sysv_shm.c:480 syscall(ffff8000325f5b10) at syscall+0x97e sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xbb538362ac0, 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 0xfffffd806bec9000; item addr 0xfffffd806bec9700; offset 0x0=0x0 != 0xcdfa046375e46c65 ddb> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:437 panic(ffffffff82fe38ac) at panic+0x1cf sys/kern/subr_prf.c:198 pool_do_get(ffffffff83598b90,1,ffff8000325f58bc) at pool_do_get+0x57e pool_get(ffffffff83598b90,1) at pool_get+0xf0 shmget_allocate_segment(ffff80003761d1d8,ffff8000325f5b10,182,ffff8000325f5a60) at shmget_allocate_segment+0x1a7 sys_shmget(ffff80003761d1d8,ffff8000325f5b10,ffff8000325f5a60) at sys_shmget+0x1b2 sys/kern/sysv_shm.c:480 syscall(ffff8000325f5b10) at syscall+0x97e sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xbb538362ac0, count: -8 ddb> show registers rdi 0 rsi 0x1 rbp 0xffff8000325f5730 rbx 0xfffffd806bec9700 rdx 0xffff8000015712c0 rcx 0 rax 0xffff80003761d1d8 r8 0x101010101010101 r9 0x8080808080808080 r10 0x3782cfd5b8240f21 r11 0xb568d2d58dddd2fc r12 0 r13 0xfffffd806bec9f90 r14 0 r15 0x1 rip 0xffffffff821b1535 db_enter+0x25 cs 0x8 rflags 0x246 rsp 0xffff8000325f5720 ss 0x10 db_enter+0x25: addq $0x8,%rsp ddb> show proc PROC (syz-executor) tid=387534 pid=7152 tcnt=2 stat=onproc flags process=10 proc=4000000 runpri=50, usrpri=50, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff80003761c7b8,0xffffffff834cd520 process=0xffff80002a553388 user=0xffff8000325f0000, vmspace=0xfffffd807130b580 estcpu=36, cpticks=1, pctcpu=0.0, user=0, sys=1, intr=0 ddb> ps PID TID PPID UID S FLAGS WAIT COMMAND 7152 469498 84052 -1 3 0x90 fsleep syz-executor * 7152 387534 84052 -1 7 0x4000010 syz-executor 90916 304790 57037 0 3 0x80 fsleep syz-executor 90916 450284 57037 0 3 0x4000080 kqsel syz-executor 46235 25314 90058 0 3 0x90 fsleep syz-executor 46235 441400 90058 0 3 0x4000090 kqsel syz-executor 71811 102388 16042 0 3 0x90 fsleep syz-executor 71811 140793 16042 0 3 0x4000090 sbwait syz-executor 60822 384481 33958 0 3 0x80 fsleep syz-executor 60822 377606 33958 0 3 0x4000080 rest syz-executor 86479 1088 26819 0 3 0x90 fsleep syz-executor 86479 417068 26819 0 3 0x4000090 kqread syz-executor 43357 132654 40471 60929 3 0x90 fsleep syz-executor 43357 447025 40471 60929 3 0x4000090 kqsel syz-executor 84052 43412 56714 0 3 0x82 nanoslp syz-executor 90058 506773 56714 0 3 0x82 nanoslp syz-executor 92259 281277 56714 0 2 0x2 syz-executor 33958 469864 56714 0 3 0x82 nanoslp syz-executor 16042 497659 56714 0 3 0x82 nanoslp syz-executor 57037 188963 56714 0 3 0x82 nanoslp syz-executor 40471 474518 56714 0 3 0x82 nanoslp syz-executor 26819 219538 56714 0 3 0x82 nanoslp syz-executor 76424 414561 0 0 3 0x14280 nfsidl nfsio 83761 10904 0 0 3 0x14280 nfsidl nfsio 88367 178927 0 0 3 0x14280 nfsidl nfsio 7164 313018 0 0 3 0x14280 nfsidl nfsio 41466 313152 0 0 3 0x14280 nfsidl nfsio 60336 138090 0 0 3 0x14280 nfsidl nfsio 74635 203789 0 0 3 0x14280 nfsidl nfsio 73415 339357 0 0 3 0x14280 nfsidl nfsio 422 337732 0 0 3 0x14280 nfsidl nfsio 93495 264981 0 0 3 0x14280 nfsidl nfsio 48031 508072 0 0 3 0x14280 nfsidl nfsio 65633 106034 0 0 3 0x14280 nfsidl nfsio 67474 245378 0 0 3 0x14280 nfsidl nfsio 21656 208824 0 0 3 0x14280 nfsidl nfsio 43442 144140 0 0 3 0x14280 nfsidl nfsio 9619 196879 0 0 3 0x14280 nfsidl nfsio 59579 176743 0 0 3 0x14280 nfsidl nfsio 87932 418514 0 0 3 0x14280 nfsidl nfsio 41564 252413 0 0 3 0x14280 nfsidl nfsio 8712 484766 0 0 3 0x14280 nfsidl nfsio 88004 181501 1 0 3 0x100083 ttyin getty 81133 450872 0 0 3 0x14200 bored sosplice 56714 383907 74164 0 3 0x82 kqread syz-executor 74164 400722 99421 0 3 0x10008a sigsusp ksh 99421 299785 88059 0 3 0x98 kqread sshd-session 88059 45874 25429 0 3 0x92 kqread sshd-session 25429 521392 1 0 3 0x88 kqread sshd 87661 120133 17261 73 2 0x1100010 syslogd 17261 419823 1 0 3 0x100082 sbwait syslogd 46953 424282 1 0 3 0x100080 kqread resolvd 68234 431061 76891 77 3 0x100092 kqread dhcpleased 75449 349401 76891 77 3 0x100092 kqread dhcpleased 76891 167427 1 0 3 0x80 kqread dhcpleased 63456 474914 0 0 3 0x14200 bored smr 96901 63703 0 0 2 0x14200 zerothread 30674 156467 0 0 3 0x14200 aiodoned aiodoned 342 371485 0 0 3 0x14200 syncer update 97405 35622 0 0 3 0x14200 cleaner cleaner 73719 191331 0 0 3 0x14200 reaper reaper 69830 175201 0 0 3 0x14200 pgdaemon pagedaemon 21805 266096 0 0 3 0x14200 bored viomb 83488 18799 0 0 3 0x40014200 acpi0 acpi0 74039 300064 0 0 3 0x14200 bored softnet3 15439 116554 0 0 3 0x14200 bored softnet2 59868 222874 0 0 3 0x14200 bored softnet1 19965 110361 0 0 3 0x14200 bored softnet0 69514 494942 0 0 3 0x14200 bored systqmp 25501 477869 0 0 3 0x14200 bored systq 83110 186639 0 0 3 0x40014200 tmoslp softclock 70669 507230 0 0 3 0x40014200 idle0 1 383460 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 10217 14146K 14461K 166960K 12329 0 pcb 19 12K 12K 166960K 168 0 rtable 211 8K 9K 166960K 3434 0 pf 31 13K 17K 166960K 279 0 ifaddr 42 8K 9K 166960K 463 0 ifgroup 50 2K 2K 166960K 480 0 sysctl 3 0K 2K 166960K 4 0 counters 30 17K 17K 166960K 144 0 ioctlops 0 0K 4K 166960K 192 0 iov 0 0K 32K 166960K 131 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1453 91K 91K 166960K 3231 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 5K 166960K 11 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 0K 166960K 29 0 dirhash 15 2K 3K 166960K 63 0 ACPI 1690 195K 286K 166960K 12418 0 file desc 18 65K 97K 166960K 2641 0 sigio 0 0K 0K 166960K 29 0 proc 60 59K 108K 166960K 3261 0 subproc 117 7K 8K 166960K 1417 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 250 0 in_multi 90 6K 7K 166960K 1216 0 ether_multi 1 0K 0K 166960K 9 0 mrt 1 0K 0K 166960K 7 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 253 1129K 1129K 166960K 253 0 exec 0 0K 1K 166960K 1720 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 225 80K 92K 166960K 19487 0 UVM aobj 29 4K 4K 166960K 35 0 pinsyscall 39 78K 98K 166960K 6190 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 1 0K 0K 166960K 79 0 NDP 13 0K 2K 166960K 337 0 temp 84 6816K 6898K 166960K 103621 0 kqueue 15 24K 33K 166960K 210 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 120 588 0 585 7 4 3 3 0 8 2 rtentry 112 1213 0 1118 4 1 3 4 0 8 0 unpcb 144 1180 0 1157 14 10 4 6 0 8 2 syncache 336 3 0 3 1 1 0 1 0 8 0 tcpcb 808 401 0 394 5 4 1 5 0 8 0 arp 88 223 0 204 1 0 1 1 0 8 0 ipq 40 6 0 4 1 0 1 1 0 8 0 ipqe 40 58 0 56 1 0 1 1 0 8 0 inpcb 336 1587 0 1572 13 6 7 7 0 8 4 nd6 104 324 0 299 1 0 1 1 0 8 0 pkpcb 40 7 0 7 2 2 0 1 0 8 0 kcovpl 48 109 0 100 1 0 1 1 0 8 0 ppxss 1072 14 0 14 3 3 0 1 0 8 0 pfstscr 40 2 0 2 1 1 0 1 0 8 0 pfanchor 1288 3 0 3 1 1 0 1 0 8 0 pfstitem 24 2 0 0 1 0 1 1 0 8 0 pfstkey 128 6 0 4 1 0 1 1 0 8 0 pfstate 344 3 0 2 1 0 1 1 0 8 0 pfrule 1344 3 0 2 2 1 1 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 4869 0 4486 47 23 24 31 0 8 0 art_table 32 4870 0 4486 5 1 4 4 0 8 0 art_node 16 1212 0 1128 1 0 1 1 0 8 0 sysvmsgpl 40 6 0 5 1 0 1 1 0 8 0 semapl 112 24 0 14 1 0 1 1 0 8 0 shmpl 112 32 0 7 1 0 1 1 0 8 0 shmpl: pool(0xffffffff83598b90:shmpl): free list modified: page 0xfffffd806bec9000; item ordinal 0; addr 0xfffffd806bec9700 (p 0xfffffd806bec9000); offset 0x0=0x0 shmpl: pool(0xffffffff83598b90:shmpl): page inconsistency: page 0xfffffd806bec9000; item ordinal 1; addr 0xf11379b61dbc1ac3 dirhash 1024 51 0 32 3 0 3 3 0 8 0 dino2pl 256 3699 0 2001 107 0 107 107 0 8 0 ffsino 240 3699 0 2001 101 0 101 101 0 8 0 nchpl 144 5405 0 3591 69 1 68 68 0 8 0 uvmvnodes 80 5366 0 0 110 0 110 110 0 8 0 vnodes 216 5366 0 0 299 0 299 299 0 8 0 namei 1024 26867 0 26866 5 4 1 3 0 8 0 kstatmem 264 250 0 228 2 0 2 2 0 8 0 scsiplug 72 5 0 5 2 2 0 1 0 8 0 scxspl 216 52672 0 52670 11 9 2 8 1 8 0 plimitpl 152 355 0 336 1 0 1 1 0 8 0 sigapl 424 2743 0 2676 9 0 9 9 0 8 0 futexpl 64 16661 0 16654 1 0 1 1 0 8 0 knotepl 120 49930 0 49877 24 22 2 17 0 8 0 kqueuepl 184 370 0 357 5 4 1 3 0 8 0 pipepl 288 532 0 503 5 2 3 5 0 8 0 fdescpl 432 2704 0 2674 6 1 5 5 0 8 0 filepl 120 12586 0 12310 22 9 13 14 0 8 1 lockfpl 104 385 0 382 1 0 1 1 0 8 0 lockfspl 48 159 0 156 1 0 1 1 0 8 0 sessionpl 144 119 0 111 1 0 1 1 0 8 0 pgrppl 48 237 0 220 1 0 1 1 0 8 0 ucredpl 104 1282 0 1263 1 0 1 1 0 8 0 zombiepl 144 2812 0 2811 3 2 1 1 0 8 0 processpl 1096 2743 0 2676 6 0 6 6 0 8 0 procpl 648 4242 0 4168 8 1 7 8 0 8 0 sosppl 168 4 0 4 2 2 0 1 0 8 0 sockpl 504 3373 0 3331 58 36 22 22 0 8 15 mcl64k 65536 18 0 18 3 3 0 1 0 8 0 mcl16k 16384 6 0 6 3 3 0 1 0 8 0 mcl12k 12288 2 0 2 2 2 0 1 0 8 0 mcl8k 8192 25 0 24 3 2 1 1 0 8 0 mcl4k 4096 24 0 24 4 3 1 1 0 8 1 mcl2k2 2112 1 0 1 1 1 0 1 0 8 0 mcl2k 2048 9809 0 9711 31 17 14 27 0 8 0 mtagpl 96 114 0 114 3 3 0 3 0 8 0 mbufpl 256 33416 0 33220 201 188 13 84 0 8 0 bufpl 280 11576 0 2678 636 0 636 636 0 8 0 anonpl 24 367793 0 364404 101 54 47 51 0 187 1 amapchunkpl 152 61401 0 60913 65 42 23 35 0 158 1 amappl16 200 5486 0 5464 38 23 15 15 0 8 5 amappl15 192 7 0 7 1 1 0 1 0 8 0 amappl14 184 305 0 295 1 0 1 1 0 8 0 amappl13 176 10 0 10 2 2 0 1 0 8 0 amappl12 168 4871 0 4841 3 1 2 3 0 8 0 amappl11 160 49 0 39 1 0 1 1 0 8 0 amappl10 152 6 0 5 2 1 1 1 0 8 0 amappl9 144 140 0 139 1 0 1 1 0 8 0 amappl8 136 22 0 20 1 0 1 1 0 8 0 amappl7 128 294 0 283 1 0 1 1 0 8 0 amappl6 120 1136 0 1134 1 0 1 1 0 8 0 amappl5 112 517 0 507 1 0 1 1 0 8 0 amappl4 104 574 0 557 1 0 1 1 0 8 0 amappl3 96 11760 0 11648 5 1 4 4 0 8 0 amappl2 88 2004 0 1943 2 0 2 2 0 8 0 amappl1 80 20609 0 20090 13 1 12 13 0 8 0 amappl 88 18369 0 18198 7 2 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 18 0 17 1 0 1 1 0 8 0 aobjpl 72 34 0 6 1 0 1 1 0 8 0 uaddrrnd 24 2704 0 2674 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 2704 0 2674 1 0 1 1 0 8 0 vmmpekpl 168 21235 0 21183 3 0 3 3 0 8 0 vmmpepl 168 167268 0 165505 118 25 93 93 0 357 1 vmsppl 344 2703 0 2674 5 1 4 4 0 8 0 rwobjpl 24 51750 0 45497 40 0 40 40 0 8 0 pdppl 4096 5414 0 5348 257 185 72 82 0 8 6 pvpl 32 1254591 0 1243432 511 383 128 223 0 265 1 pmappl 216 2703 0 2674 3 1 2 3 0 8 0 extentpl 40 56 0 38 1 0 1 1 0 8 0 phpool 112 851 0 479 13 1 12 13 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:437 panic(ffffffff82fe38ac) at panic+0x1cf sys/kern/subr_prf.c:198 pool_do_get(ffffffff83598b90,1,ffff8000325f58bc) at pool_do_get+0x57e pool_get(ffffffff83598b90,1) at pool_get+0xf0 shmget_allocate_segment(ffff80003761d1d8,ffff8000325f5b10,182,ffff8000325f5a60) at shmget_allocate_segment+0x1a7 sys_shmget(ffff80003761d1d8,ffff8000325f5b10,ffff8000325f5a60) at sys_shmget+0x1b2 sys/kern/sysv_shm.c:480 syscall(ffff8000325f5b10) at syscall+0x97e sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xbb538362ac0, count: -8 ddb> machine ddbcpu 1 No such command ddb> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:437 panic(ffffffff82fe38ac) at panic+0x1cf sys/kern/subr_prf.c:198 pool_do_get(ffffffff83598b90,1,ffff8000325f58bc) at pool_do_get+0x57e pool_get(ffffffff83598b90,1) at pool_get+0xf0 shmget_allocate_segment(ffff80003761d1d8,ffff8000325f5b10,182,ffff8000325f5a60) at shmget_allocate_segment+0x1a7 sys_shmget(ffff80003761d1d8,ffff8000325f5b10,ffff8000325f5a60) at sys_shmget+0x1b2 sys/kern/sysv_shm.c:480 syscall(ffff8000325f5b10) at syscall+0x97e sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xbb538362ac0, count: -8