panic: malloc: allocation too large, type = 29, size = 13002741572 Stopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND *154224 21123 0 0x2 0 0 syz-executor1390 db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:440 panic(ffffffff8247fb14) at panic+0x161 sys/kern/subr_prf.c:202 malloc(307061744,1d,1) at malloc+0xa34 sys/kern/kern_malloc.c:345 sys_shmat(ffff80002165ea90,ffff80002167d498,ffff80002167d4f0) at sys_shmat+0x7f sys/kern/sysv_shm.c:228 syscall(ffff80002167d560) at syscall+0x44e sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7f7ffffdc1a0, count: 9 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: malloc: allocation too large, type = 29, size = 13002741572 ddb> trace db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:440 panic(ffffffff8247fb14) at panic+0x161 sys/kern/subr_prf.c:202 malloc(307061744,1d,1) at malloc+0xa34 sys/kern/kern_malloc.c:345 sys_shmat(ffff80002165ea90,ffff80002167d498,ffff80002167d4f0) at sys_shmat+0x7f sys/kern/sysv_shm.c:228 syscall(ffff80002167d560) at syscall+0x44e sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7f7ffffdc1a0, count: -6 ddb> show registers rdi 0 rsi 0x1 rbp 0xffff80002167d280 rbx 0 rdx 0x8b rcx 0x2 rax 0x43 r8 0xffffffff81c693b5 kprintf+0x145 r9 0x1 r10 0xdacc8454756b98fe r11 0xb373cb11a7f0bc76 r12 0 r13 0x307061744 r14 0 r15 0x1 rip 0xffffffff81a08b68 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff80002167d270 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb> show proc PROC (syz-executor1390) pid=154224 stat=onproc flags process=2 proc=0 pri=52, usrpri=52, nice=20 forw=0xffffffffffffffff, list=0xffff80002165e7f0,0xffffffff82915da8 process=0xffff800021641b68 user=0xffff800021678000, vmspace=0xfffffd806eece778 estcpu=2, cpticks=1, pctcpu=0.0 user=0, sys=1, intr=0 ddb> ps PID TID PPID UID S FLAGS WAIT COMMAND *21123 154224 32364 0 7 0x2 syz-executor1390 32364 241433 65339 0 3 0x10008a sigsusp ksh 65339 174058 87910 0 3 0x9a kqread sshd 6975 406453 1 0 3 0x100083 ttyin getty 87910 43344 1 0 3 0x88 kqread sshd 6370 74643 53757 73 3 0x100090 kqread syslogd 53757 80923 1 0 3 0x100082 netio syslogd 39004 332412 1 0 3 0x100080 kqread resolvd 86958 1611 13428 77 3 0x100092 kqread dhcpleased 50023 415540 13428 77 3 0x100092 kqread dhcpleased 13428 473042 1 0 3 0x80 kqread dhcpleased 85373 356448 0 0 3 0x14200 bored smr 48839 193071 0 0 2 0x14200 zerothread 84623 384448 0 0 3 0x14200 aiodoned aiodoned 79520 386670 0 0 3 0x14200 syncer update 31195 88298 0 0 3 0x14200 cleaner cleaner 38920 53640 0 0 3 0x14200 reaper reaper 51946 510045 0 0 3 0x14200 pgdaemon pagedaemon 22308 187493 0 0 3 0x14200 bored viomb 41970 49771 0 0 3 0x40014200 acpi0 acpi0 15430 469997 0 0 3 0x14200 bored softnet 505 15207 0 0 3 0x14200 bored systqmp 89333 10893 0 0 3 0x14200 bored systq 93889 387363 0 0 3 0x40014200 bored softclock 99008 271854 0 0 3 0x40014200 idle0 1 126179 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 10091 6342K 6373K 78643K 11181 0 pcb 13 8K 8K 78643K 13 0 rtable 62 2K 2K 78643K 108 0 ifaddr 24 7K 7K 78643K 24 0 counters 19 16K 16K 78643K 19 0 ioctlops 0 0K 2K 78643K 25 0 mount 1 1K 1K 78643K 1 0 log 0 0K 0K 78643K 5 0 vnodes 1182 74K 74K 78643K 1187 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 1K 78643K 2 0 VM map 2 0K 0K 78643K 2 0 sem 2 0K 0K 78643K 2 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1697 195K 286K 78643K 12598 0 file desc 1 0K 0K 78643K 1 0 proc 55 54K 55K 78643K 222 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 in_multi 11 0K 0K 78643K 11 0 ether_multi 1 0K 0K 78643K 1 0 ISOFS mount 1 32K 32K 78643K 1 0 MSDOSFS mount 1 16K 16K 78643K 1 0 ttys 19 95K 95K 78643K 19 0 exec 0 0K 2K 78643K 312 0 tdb 3 0K 0K 78643K 3 0 pagedep 1 8K 8K 78643K 1 0 inodedep 1 32K 32K 78643K 1 0 newblk 1 0K 0K 78643K 1 0 VM swap 7 26K 26K 78643K 7 0 UVM amap 73 3K 5K 78643K 1424 0 UVM aobj 3 2K 2K 78643K 3 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 NDP 3 0K 0K 78643K 3 0 temp 18 4173K 4237K 78643K 1723 0 kqueue 11 16K 16K 78643K 20 0 SYN cache 2 16K 16K 78643K 2 0 ddb> show all pools Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle rtpcb 120 17 0 14 1 0 1 1 0 8 0 rtentry 112 23 0 1 1 0 1 1 0 8 0 unpcb 128 33 0 20 1 0 1 1 0 8 0 syncache 296 5 0 5 1 0 1 1 0 8 1 tcpcb 736 8 0 5 1 0 1 1 0 8 0 arp 88 2 0 0 1 0 1 1 0 8 0 inpcb 304 25 0 19 1 0 1 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 96 0 0 6 0 6 6 0 8 0 art_table 32 97 0 0 1 0 1 1 0 8 0 art_node 16 22 0 2 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 1404 0 22 87 0 87 87 0 8 0 ffsino 240 1404 0 22 82 0 82 82 0 8 0 nchpl 144 1578 0 38 58 0 58 58 0 8 0 uvmvnodes 72 1413 0 0 26 0 26 26 0 8 0 vnodes 224 1413 0 0 84 0 84 84 0 8 0 namei 1024 3858 0 3858 1 0 1 1 0 8 1 scxspl 216 3338 0 3338 2 1 1 2 0 8 1 plimitpl 152 15 0 9 1 0 1 1 0 8 0 sigapl 424 225 0 199 4 0 4 4 0 8 0 knotepl 112 2876 0 2848 1 0 1 1 0 8 0 kqueuepl 184 16 0 9 1 0 1 1 0 8 0 pipepl 304 62 0 59 1 0 1 1 0 8 0 fdescpl 432 212 0 199 3 0 3 3 0 8 0 filepl 120 947 0 894 2 0 2 2 0 8 0 lockfpl 104 6 0 4 1 0 1 1 0 8 0 lockfspl 48 4 0 2 1 0 1 1 0 8 0 sessionpl 144 17 0 9 1 0 1 1 0 8 0 pgrppl 48 17 0 9 1 0 1 1 0 8 0 ucredpl 96 64 0 54 1 0 1 1 0 8 0 zombiepl 144 199 0 199 1 0 1 1 0 8 1 processpl 1000 225 0 199 5 1 4 5 0 8 0 procpl 672 225 0 199 3 0 3 3 0 8 0 sockpl 448 75 0 53 3 0 3 3 0 8 0 mcl8k 8192 9 0 9 1 0 1 1 0 8 1 mcl4k 4096 5 0 5 1 0 1 1 0 8 1 mcl2k 2048 5648 0 5612 8 1 7 8 0 8 1 mtagpl 96 3 0 3 1 1 0 1 0 8 0 mbufpl 256 9660 0 9585 8 1 7 8 0 8 1 bufpl 280 1912 0 88 131 0 131 131 0 8 0 anonpl 24 29222 0 27197 16 3 13 16 0 188 0 amapchunkpl 152 2686 0 2560 7 1 6 7 0 158 0 amappl16 200 25 0 24 2 1 1 1 0 8 0 amappl15 192 58 0 54 1 0 1 1 0 8 0 amappl13 176 16 0 15 1 0 1 1 0 8 0 amappl12 168 7 0 7 1 1 0 1 0 8 0 amappl11 160 56 0 44 1 0 1 1 0 8 0 amappl10 152 8 0 8 1 1 0 1 0 8 0 amappl9 144 199 0 196 1 0 1 1 0 8 0 amappl8 136 246 0 244 1 0 1 1 0 8 0 amappl7 128 29 0 28 1 0 1 1 0 8 0 amappl6 120 33 0 28 1 0 1 1 0 8 0 amappl5 112 231 0 216 1 0 1 1 0 8 0 amappl4 104 469 0 450 1 0 1 1 0 8 0 amappl3 96 145 0 132 1 0 1 1 0 8 0 amappl2 88 269 0 237 1 0 1 1 0 8 0 amappl1 80 6814 0 6470 9 0 9 9 0 8 1 amappl 88 1207 0 1151 2 0 2 2 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 64 2 0 0 1 0 1 1 0 8 0 uaddrrnd 24 212 0 199 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 212 0 199 1 0 1 1 0 8 0 vmmpekpl 168 5644 0 5628 1 0 1 1 0 8 0 vmmpepl 168 20360 0 19603 39 1 38 38 0 357 1 vmsppl 272 211 0 199 2 0 2 2 0 8 0 rwobjpl 24 6326 0 5829 4 0 4 4 0 8 1 pdppl 4096 430 0 398 48 16 32 44 0 8 0 pvpl 32 100048 0 96307 34 0 34 34 0 265 1 pmappl 192 211 0 199 1 0 1 1 0 8 0 extentpl 40 58 0 40 1 0 1 1 0 8 0 phpool 112 255 0 20 7 0 7 7 0 8 0 ddb> machine ddbcpu 0 No such command ddb> trace db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:440 panic(ffffffff8247fb14) at panic+0x161 sys/kern/subr_prf.c:202 malloc(307061744,1d,1) at malloc+0xa34 sys/kern/kern_malloc.c:345 sys_shmat(ffff80002165ea90,ffff80002167d498,ffff80002167d4f0) at sys_shmat+0x7f sys/kern/sysv_shm.c:228 syscall(ffff80002167d560) at syscall+0x44e sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7f7ffffdc1a0, count: -6 ddb> machine ddbcpu 1 No such command ddb> trace db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:440 panic(ffffffff8247fb14) at panic+0x161 sys/kern/subr_prf.c:202 malloc(307061744,1d,1) at malloc+0xa34 sys/kern/kern_malloc.c:345 sys_shmat(ffff80002165ea90,ffff80002167d498,ffff80002167d4f0) at sys_shmat+0x7f sys/kern/sysv_shm.c:228 syscall(ffff80002167d560) at syscall+0x44e sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7f7ffffdc1a0, count: -6 ddb>