panic: malloc: allocation too large, type = 31, size = 4294970988 Stopped at db_enter+0x25: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND *177782 96975 0 0 0x4000000 1K syz-executor 505801 98077 0 0 0x4000000 0 syz-executor db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff83371bf8) at panic+0x1e5 sys/kern/subr_prf.c:198 malloc(100000e6c,1f,1) at malloc+0xcf4 sys/kern/kern_malloc.c:334 sys_semop(ffff8000398c74a8,ffff80003a8d6c60,ffff80003a8d6bb0) at sys_semop+0x234 sys/kern/sysv_sem.c:564 syscall(ffff80003a8d6c60) at syscall+0xb08 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003a8d6c60) at syscall+0xb08 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x5051e733670, 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{1}> ddb{1}> set $lines = 0 ddb{1}> set $maxwidth = 0 ddb{1}> show panic *cpu1: malloc: allocation too large, type = 31, size = 4294970988 ddb{1}> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff83371bf8) at panic+0x1e5 sys/kern/subr_prf.c:198 malloc(100000e6c,1f,1) at malloc+0xcf4 sys/kern/kern_malloc.c:334 sys_semop(ffff8000398c74a8,ffff80003a8d6c60,ffff80003a8d6bb0) at sys_semop+0x234 sys/kern/sysv_sem.c:564 syscall(ffff80003a8d6c60) at syscall+0xb08 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003a8d6c60) at syscall+0xb08 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x5051e733670, count: -6 ddb{1}> show registers rdi 0 rsi 0x1 rbp 0xffff80003a8d68d0 rbx 0xffff800029a9cdc7 rdx 0xffff800001444a80 rcx 0xffff8000398c74a8 rax 0xffff800029a9bff0 r8 0x101010101010101 r9 0x8080808080808080 r10 0xdc29ef0232db59ea r11 0x2abe8bb64abae48 r12 0xffff800029a9cbc8 r13 0 r14 0 r15 0x1 rip 0xffffffff810240e5 db_enter+0x25 cs 0x8 rflags 0x246 rsp 0xffff80003a8d68c0 ss 0x10 db_enter+0x25: addq $0x8,%rsp ddb{1}> show proc PROC (syz-executor) tid=177782 pid=96975 tcnt=2 stat=onproc flags process=0 proc=4000000 runpri=32, usrpri=86, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff8000398c67d8,0xffff8000398c79d8 process=0xffff80003a8db2a8 user=0xffff80003a8d1000, vmspace=0xfffffd806bec91e0 estcpu=36, cpticks=1, pctcpu=0.0, user=0, sys=1, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 33745 236018 23048 0 2 0 syz-executor 33745 379041 23048 0 3 0x4000080 fsleep syz-executor 96975 96403 45134 0 2 0 syz-executor *96975 177782 45134 0 7 0x4000000 syz-executor 70475 99438 31540 0 3 0x80 nanoslp syz-executor 70475 513727 31540 0 3 0x4000080 fsleep syz-executor 98077 180789 45001 0 2 0 syz-executor 98077 505801 45001 0 7 0x4000000 syz-executor 78170 448663 1537 0 2 0x480 syz-executor 78170 238255 1537 0 3 0x4000080 msgwait syz-executor 78170 488121 1537 0 3 0x4000080 fsleep syz-executor 66571 502240 0 0 3 0x14200 bored sosplice 65127 491354 56625 0 3 0x100082 sbwait arp 56625 323168 91563 0 3 0x10008a sigsusp sh 31540 268838 34957 0 2 0x482 syz-executor 95500 498054 34957 0 2 0x482 syz-executor 45134 71959 34957 0 2 0x482 syz-executor 24737 403859 34957 0 2 0x482 syz-executor 91563 67961 34957 0 3 0x82 wait syz-executor 45001 306645 34957 0 2 0x482 syz-executor 1537 472579 34957 0 2 0x482 syz-executor 23048 345853 34957 0 2 0x482 syz-executor 34957 442873 92648 0 3 0x82 kqread syz-executor 92648 199381 5788 0 3 0x10008a sigsusp ksh 5788 389454 77814 0 3 0x98 kqread sshd-session 77814 362652 56067 0 3 0x92 kqread sshd-session 66490 36945 1 0 3 0x100083 ttyin getty 56067 367051 1 0 3 0x88 kqread sshd 78426 154821 74344 74 3 0x1100092 bpf pflogd 74344 470085 1 0 3 0x80 sbwait pflogd 11764 479527 44661 73 3 0x1100090 kqread syslogd 44661 420830 1 0 3 0x100082 sbwait syslogd 89151 462595 1 0 3 0x100080 kqread resolvd 71007 308780 7205 77 3 0x100092 kqread dhcpleased 43210 398477 7205 77 3 0x100092 kqread dhcpleased 7205 402214 1 0 3 0x80 kqread dhcpleased 79914 268416 0 0 2 0x40014200 smr 86256 117033 0 0 2 0x14200 zerothread 96233 70597 0 0 3 0x14200 aiodoned aiodoned 36929 271256 0 0 3 0x14200 syncer update 44573 103173 0 0 3 0x14200 cleaner cleaner 84879 257771 0 0 3 0x14200 reaper reaper 56159 55586 0 0 3 0x14200 pgdaemon pagedaemon 92105 204967 0 0 3 0x14200 bored viomb 51743 359869 0 0 3 0x40014200 acpi0 acpi0 90588 412804 0 0 3 0x40014200 idle1 6812 34151 0 0 3 0x14200 bored softnet3 24158 415897 0 0 3 0x14200 bored softnet2 8545 130000 0 0 3 0x14200 bored softnet1 50145 410815 0 0 3 0x14200 bored softnet0 80427 452150 0 0 3 0x14200 bored systqmp 80672 289618 0 0 3 0x14200 bored systq 64265 430464 0 0 3 0x14200 tmoslp softclockmp 19066 87739 0 0 2 0x40014200 softclock 35867 68470 0 0 3 0x40014200 idle0 1 281486 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks Process 96975 (syz-executor) thread 0xffff8000398c74a8 (177782) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff83906af8) #0 witness_lock+0x5bb stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5bb sys/kern/subr_witness.c:1155 #1 syscall+0xae6 mi_syscall sys/sys/syscall_mi.h:176 [inline] #1 syscall+0xae6 sys/arch/amd64/amd64/trap.c:577 #2 Xsyscall+0x128 Process 98077 (syz-executor) thread 0xffff8000ffff67d0 (505801) shared rwlock vmmaplk r = 0 (0xfffffd806bec9118) #0 witness_lock+0x5bb stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5bb sys/kern/subr_witness.c:1155 #1 rw_do_enter_read+0x3af sys/kern/kern_rwlock.c:405 #2 uvmfault_lookup+0x122 sys/uvm/uvm_fault.c:1864 #3 uvm_fault_check+0x4b sys/uvm/uvm_fault.c:732 #4 uvm_fault+0x106 sys/uvm/uvm_fault.c:668 #5 kpageflttrap+0x2d0 sys/arch/amd64/amd64/trap.c:279 #6 kerntrap+0x14a sys/arch/amd64/amd64/trap.c:332 #7 alltraps_kern_meltdown+0x7b #8 copyout+0x57 #9 syscall+0xbc6 mi_syscall sys/sys/syscall_mi.h:176 [inline] #9 syscall+0xbc6 sys/arch/amd64/amd64/trap.c:577 #10 Xsyscall+0x128 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10214 11282K 11282K 166960K 11679 0 pcb 18 12K 12K 166960K 59 0 rtable 212 6K 7K 166960K 368 0 pf 36 18K 21K 166960K 103 0 ifaddr 38 6K 7K 166960K 50 0 ifgroup 56 2K 2K 166960K 75 0 sysctl 3 1K 1K 166960K 3 0 counters 64 36K 36K 166960K 74 0 ioctlops 0 0K 4K 166960K 1559 0 iov 0 0K 16K 166960K 12 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1399 88K 88K 166960K 1572 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 5K 166960K 4 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 0K 166960K 47 0 dirhash 12 2K 2K 166960K 18 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 19 69K 93K 166960K 363 0 sigio 0 0K 0K 166960K 3 0 proc 72 91K 128K 166960K 555 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 40 0 in_multi 78 5K 6K 166960K 100 0 ether_multi 1 0K 0K 166960K 5 0 mrt 1 0K 0K 166960K 2 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 406 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 242 73K 77K 166960K 4923 0 UVM aobj 6 4K 4K 166960K 6 0 pinsyscall 45 90K 105K 166960K 1437 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 14 0 NDP 12 0K 1K 166960K 31 0 temp 41 8635K 8762K 166960K 17869 0 kqueue 14 22K 28K 166960K 69 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 24 0 0 1 0 1 1 0 8 0 rtpcb 120 50 0 45 1 0 1 1 0 8 0 rtentry 112 110 0 13 4 0 4 4 0 8 0 unpcb 144 148 0 130 1 0 1 1 0 8 0 syncache 336 4 0 4 1 1 0 1 0 8 0 tcpcb 808 59 0 54 1 0 1 1 0 8 0 arp 120 18 0 2 1 0 1 1 0 8 0 inpcb 376 253 0 240 2 0 2 2 0 8 0 nd6 136 24 0 3 1 0 1 1 0 8 0 pkpcb 40 3 0 3 2 1 1 1 0 8 1 kcovpl 48 8 0 0 1 0 1 1 0 8 0 ppxss 1168 1 0 1 1 0 1 1 0 8 1 pfstscr 40 1 0 1 1 0 1 1 0 8 1 pffrag 232 2 0 1 1 0 1 1 0 482 0 pffrnode 88 2 0 1 1 0 1 1 0 8 0 pffrent 40 4 0 3 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 pfrktable 1344 1 0 1 1 0 1 1 0 8 1 pftag 88 2 0 1 1 0 1 1 0 8 0 pfstitem 24 37 0 1 1 0 1 1 0 8 0 pfstkey 128 41 0 5 2 0 2 2 0 8 0 pfstate 376 38 0 3 4 0 4 4 0 8 0 pfrule 1344 27 0 22 2 1 1 2 0 8 0 art_heap8 4096 2 0 0 2 0 2 2 0 8 0 art_heap4 256 450 0 44 26 0 26 26 0 8 0 art_table 32 452 0 44 4 0 4 4 0 8 0 art_node 16 108 0 19 1 0 1 1 0 8 0 sysvmsgpl 40 3 0 3 2 1 1 1 0 8 1 semapl 112 45 0 35 1 0 1 1 0 8 0 shmpl 112 3 0 0 1 0 1 1 0 8 0 dirhash 1024 21 0 4 3 0 3 3 0 8 0 dino2pl 256 1983 0 475 95 0 95 95 0 8 0 ffsino 280 1983 0 475 109 0 109 109 0 8 0 nchpl 144 2517 0 830 63 0 63 63 0 8 0 uvmvnodes 80 2219 0 0 46 0 46 46 0 8 0 vnodes 216 2219 0 0 124 0 124 124 0 8 0 namei 1024 8524 0 8524 1 0 1 1 0 8 1 percpumem 16 51 0 5 1 0 1 1 0 8 0 kstatmem 264 34 0 10 2 0 2 2 0 8 0 scxspl 216 7740 0 7740 4 3 1 2 1 8 1 plimitpl 152 68 0 51 1 0 1 1 0 8 0 sigapl 424 663 0 611 7 0 7 7 0 8 0 futexpl 64 3834 0 3831 1 0 1 1 0 8 0 knotepl 120 312 0 0 10 0 10 10 0 8 0 kqueuepl 216 84 0 73 1 0 1 1 0 8 0 pipepl 328 122 0 95 3 0 3 3 0 8 0 fdescpl 504 644 0 611 5 0 5 5 0 8 0 filepl 152 3154 0 2921 15 2 13 14 0 8 3 lockfpl 104 76 0 73 1 0 1 1 0 8 0 lockfspl 48 37 0 34 1 0 1 1 0 8 0 sessionpl 144 23 0 14 1 0 1 1 0 8 0 pgrppl 48 31 0 14 1 0 1 1 0 8 0 ucredpl 104 391 0 377 1 0 1 1 0 8 0 zombiepl 144 613 0 611 1 0 1 1 0 8 0 processpl 1176 663 0 611 5 0 5 5 0 8 0 procpl 656 1056 0 998 6 0 6 6 0 8 0 srpgc 96 2 0 2 1 0 1 1 0 8 1 sosppl 168 2 0 0 1 0 1 1 0 8 0 sockpl 688 456 0 420 4 0 4 4 0 8 0 mcl64k 65536 2 0 0 1 0 1 1 0 8 0 mcl8k 8192 3 0 0 1 0 1 1 0 8 0 mcl4k 4096 112 0 0 14 0 14 14 0 8 0 mcl2k 2048 31 0 0 4 0 4 4 0 8 0 mtagpl 96 48 0 0 2 0 2 2 0 8 0 mbufpl 256 209 0 0 13 0 13 13 0 8 0 bufpl 280 3763 0 131 260 0 260 260 0 8 0 anonpl 24 127149 0 120860 61 1 60 60 0 184 19 amapchunkpl 152 15541 0 14935 28 0 28 28 0 158 4 amappl16 200 2630 0 2521 18 3 15 17 0 8 8 amappl15 192 4 0 4 1 1 0 1 0 8 0 amappl14 184 119 0 106 1 0 1 1 0 8 0 amappl13 176 2 0 2 1 1 0 1 0 8 0 amappl12 168 1281 0 1247 3 1 2 2 0 8 0 amappl11 160 54 0 39 1 0 1 1 0 8 0 amappl10 152 33 0 33 1 1 0 1 0 8 0 amappl9 144 250 0 250 1 1 0 1 0 8 0 amappl8 136 28 0 25 1 0 1 1 0 8 0 amappl7 128 108 0 95 1 0 1 1 0 8 0 amappl6 120 174 0 169 1 0 1 1 0 8 0 amappl5 112 121 0 112 1 0 1 1 0 8 0 amappl4 104 308 0 287 1 0 1 1 0 8 0 amappl3 96 2780 0 2659 4 0 4 4 0 8 1 amappl2 88 640 0 574 2 0 2 2 0 8 0 amappl1 80 8606 0 8002 15 0 15 15 0 8 0 amappl 88 4547 0 4363 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 18 0 17 1 0 1 1 0 8 0 aobjpl 72 5 0 0 1 0 1 1 0 8 0 uaddrrnd 24 644 0 611 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 644 0 611 1 0 1 1 0 8 0 vmmpekpl 168 6885 0 6846 3 0 3 3 0 8 0 vmmpepl 168 45588 0 43553 99 0 99 99 0 357 10 vmsppl 456 643 0 611 5 0 5 5 0 8 0 rwobjpl 64 17879 0 14582 55 0 55 55 0 8 1 pdppl 4096 1295 0 1222 97 24 73 85 0 8 0 pvpl 32 16966 0 0 137 0 137 137 0 265 0 pmappl 248 643 0 611 3 0 3 3 0 8 0 extentpl 40 55 0 38 1 0 1 1 0 8 0 phpool 112 268 0 27 8 0 8 8 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp x86_ipi_db(ffffffff8383aff0) at x86_ipi_db+0x27 sys/arch/amd64/amd64/db_interface.c:394 x86_ipi_handler() at x86_ipi_handler+0xd9 sys/arch/amd64/amd64/ipi.c:106 Xresume_lapic_ipi() at Xresume_lapic_ipi+0x27 rw_assert_anylock(fffffd806bec9100) at rw_assert_anylock+0x25 uvm_map_lookup_entry(fffffd806bec9018,1db000,ffff8000310a5d20) at uvm_map_lookup_entry+0x79 vm_map_assert_anylock_ln sys/uvm/uvm_map.c:5344 [inline] uvm_map_lookup_entry(fffffd806bec9018,1db000,ffff8000310a5d20) at uvm_map_lookup_entry+0x79 sys/uvm/uvm_map.c:1563 uvmfault_lookup(ffff8000310a5cf8,0) at uvmfault_lookup+0x133 sys/uvm/uvm_fault.c:1864 uvm_fault_check(ffff8000310a5cf8,ffff8000310a5d30,ffff8000310a5d60,0) at uvm_fault_check+0x4b sys/uvm/uvm_fault.c:732 uvm_fault(fffffd806bec9018,1db000,0,2) at uvm_fault+0x106 sys/uvm/uvm_fault.c:668 kpageflttrap(ffff8000310a5ea0,1db340) at kpageflttrap+0x2d0 sys/arch/amd64/amd64/trap.c:279 kerntrap(ffff8000310a5ea0) at kerntrap+0x14a sys/arch/amd64/amd64/trap.c:332 alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b copyout() at copyout+0x57 syscall(ffff8000310a62f0) at syscall+0xbc6 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff8000310a62f0) at syscall+0xbc6 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x77e15a51680, count: 1 ddb{0}> trace x86_ipi_db(ffffffff8383aff0) at x86_ipi_db+0x27 sys/arch/amd64/amd64/db_interface.c:394 x86_ipi_handler() at x86_ipi_handler+0xd9 sys/arch/amd64/amd64/ipi.c:106 Xresume_lapic_ipi() at Xresume_lapic_ipi+0x27 rw_assert_anylock(fffffd806bec9100) at rw_assert_anylock+0x25 uvm_map_lookup_entry(fffffd806bec9018,1db000,ffff8000310a5d20) at uvm_map_lookup_entry+0x79 vm_map_assert_anylock_ln sys/uvm/uvm_map.c:5344 [inline] uvm_map_lookup_entry(fffffd806bec9018,1db000,ffff8000310a5d20) at uvm_map_lookup_entry+0x79 sys/uvm/uvm_map.c:1563 uvmfault_lookup(ffff8000310a5cf8,0) at uvmfault_lookup+0x133 sys/uvm/uvm_fault.c:1864 uvm_fault_check(ffff8000310a5cf8,ffff8000310a5d30,ffff8000310a5d60,0) at uvm_fault_check+0x4b sys/uvm/uvm_fault.c:732 uvm_fault(fffffd806bec9018,1db000,0,2) at uvm_fault+0x106 sys/uvm/uvm_fault.c:668 kpageflttrap(ffff8000310a5ea0,1db340) at kpageflttrap+0x2d0 sys/arch/amd64/amd64/trap.c:279 kerntrap(ffff8000310a5ea0) at kerntrap+0x14a sys/arch/amd64/amd64/trap.c:332 alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b copyout() at copyout+0x57 syscall(ffff8000310a62f0) at syscall+0xbc6 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff8000310a62f0) at syscall+0xbc6 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x77e15a51680, count: -14 ddb{0}> machine ddbcpu 1 Stopped at db_enter+0x25: addq $0x8,%rsp db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff83371bf8) at panic+0x1e5 sys/kern/subr_prf.c:198 malloc(100000e6c,1f,1) at malloc+0xcf4 sys/kern/kern_malloc.c:334 sys_semop(ffff8000398c74a8,ffff80003a8d6c60,ffff80003a8d6bb0) at sys_semop+0x234 sys/kern/sysv_sem.c:564 syscall(ffff80003a8d6c60) at syscall+0xb08 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003a8d6c60) at syscall+0xb08 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x5051e733670, count: 9 ddb{1}> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff83371bf8) at panic+0x1e5 sys/kern/subr_prf.c:198 malloc(100000e6c,1f,1) at malloc+0xcf4 sys/kern/kern_malloc.c:334 sys_semop(ffff8000398c74a8,ffff80003a8d6c60,ffff80003a8d6bb0) at sys_semop+0x234 sys/kern/sysv_sem.c:564 syscall(ffff80003a8d6c60) at syscall+0xb08 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003a8d6c60) at syscall+0xb08 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x5051e733670, count: -6