panic: chgproccnt: procs < 0 Stopped at db_enter+0x25: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND *347436 99700 0 0x10 0x4000000 0 syz-executor db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff835080c4) at panic+0x1cf sys/kern/subr_prf.c:198 chgproccnt(ee00,ffffffff) at chgproccnt+0xcc sys_setreuid(ffff8000344b7248,ffff80003b8e90e0,ffff80003b8e9030) at sys_setreuid+0x563 sys/kern/kern_prot.c:688 syscall(ffff80003b8e90e0) at syscall+0x962 mi_syscall sys/sys/syscall_mi.h:-1 [inline] syscall(ffff80003b8e90e0) at syscall+0x962 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x827acaa8500, 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: chgproccnt: procs < 0 ddb> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff835080c4) at panic+0x1cf sys/kern/subr_prf.c:198 chgproccnt(ee00,ffffffff) at chgproccnt+0xcc sys_setreuid(ffff8000344b7248,ffff80003b8e90e0,ffff80003b8e9030) at sys_setreuid+0x563 sys/kern/kern_prot.c:688 syscall(ffff80003b8e90e0) at syscall+0x962 mi_syscall sys/sys/syscall_mi.h:-1 [inline] syscall(ffff80003b8e90e0) at syscall+0x962 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x827acaa8500, count: -6 ddb> show registers rdi 0 rsi 0x1 rbp 0xffff80003b8e8ec0 rbx 0xee00 __ALIGN_SIZE+0xde00 rdx 0xffff8000015ec740 rcx 0 rax 0xffff8000344b7248 r8 0x101010101010101 r9 0x8080808080808080 r10 0xe7a6dcad641ef2af r11 0x10a4f5c69ed1122a r12 0 r13 0xfffff80007ffd000 r14 0 r15 0x1 rip 0xffffffff814ca275 db_enter+0x25 cs 0x8 rflags 0x246 rsp 0xffff80003b8e8eb0 ss 0x10 db_enter+0x25: addq $0x8,%rsp ddb> show proc PROC (syz-executor) tid=347436 pid=99700 tcnt=3 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=0xffff8000344b7778,0xffff800030ca0028 process=0xffff807fffff8018 user=0xffff80003b8e4000, vmspace=0xfffff8006bc66018 estcpu=36, cpticks=0, pctcpu=0.0, user=0, sys=0, intr=0 ddb> ps PID TID PPID UID S FLAGS WAIT COMMAND 1754 503447 55032 0 2 0x1000000 syz-executor 1754 469203 55032 0 3 0x5000080 fsleep syz-executor 99700 70562 24498 0 2 0x10 syz-executor *99700 347436 24498 0 7 0x4000010 syz-executor 99700 461519 24498 0 2 0x4000010 syz-executor 9058 49906 84209 0 2 0 syz-executor 9058 299549 84209 0 3 0x4000080 fsleep syz-executor 9058 24514 84209 0 3 0x4000080 fsleep syz-executor 9058 480029 84209 0 2 0x4000000 syz-executor 9542 71902 4929 0 2 0x1 syz-executor 9542 228901 4929 0 3 0x4000080 fsleep syz-executor 67489 141997 47913 0 2 0x1 syz-executor 67489 190764 47913 0 3 0x4000080 fsleep syz-executor 48221 250326 11854 0 2 0x1 syz-executor 48221 408810 11854 0 3 0x4000080 fsleep syz-executor 48221 383119 11854 0 3 0x4000080 fsleep syz-executor 17802 214636 67286 0 2 0x1 syz-executor 17802 317003 67286 0 3 0x4000080 fsleep syz-executor 36630 251927 37331 0 3 0x80 nanoslp syz-executor 36630 517016 37331 0 3 0x4000080 bpf syz-executor 36630 228210 37331 0 3 0x4000080 lockf syz-executor 36630 133583 37331 0 3 0x4000080 fsleep syz-executor 47913 213413 4079 0 3 0x82 nanoslp syz-executor 24498 181546 4079 0 3 0x82 nanoslp syz-executor 67286 107826 4079 0 3 0x82 nanoslp syz-executor 4929 488276 4079 0 3 0x82 nanoslp syz-executor 11854 272322 4079 0 3 0x82 nanoslp syz-executor 84209 2764 4079 0 3 0x82 nanoslp syz-executor 37331 33220 4079 0 3 0x82 nanoslp syz-executor 55032 33634 4079 0 3 0x82 nanoslp syz-executor 4079 275341 89571 0 3 0x82 kqread syz-executor 89571 228780 83900 0 3 0x10008a sigsusp ksh 83900 327286 68124 0 3 0x98 kqread sshd-session 68124 475885 8385 0 3 0x92 kqread sshd-session 18727 177548 1 0 3 0x100083 ttyin getty 8385 427900 1 0 3 0x88 kqread sshd 28465 494905 58074 73 3 0x1100090 kqread syslogd 58074 73822 1 0 3 0x100082 sbwait syslogd 97142 5959 1 0 3 0x100080 kqread resolvd 30733 102867 62502 77 3 0x100092 kqread dhcpleased 36265 365571 62502 77 3 0x100092 kqread dhcpleased 62502 213943 1 0 3 0x80 kqread dhcpleased 88526 175819 0 0 3 0x14200 bored smr 18786 483133 0 0 2 0x14200 zerothread 31737 151913 0 0 3 0x14200 aiodoned aiodoned 47080 163019 0 0 3 0x14200 syncer update 81225 472665 0 0 3 0x14200 cleaner cleaner 61298 13562 0 0 3 0x14200 reaper reaper 29508 28398 0 0 3 0x14200 pgdaemon pagedaemon 92228 438328 0 0 3 0x14200 bored viomb 84812 84304 0 0 3 0x40014200 acpi0 acpi0 82425 85076 0 0 3 0x14200 bored softnet0 994 156254 0 0 3 0x14200 bored systqmp 39933 408243 0 0 3 0x14200 bored systq 82874 245276 0 0 3 0x40014200 tmoslp softclock 44138 289633 0 0 3 0x40014200 idle0 1 358985 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 11051 12204K 12331K 166960K 12350 0 pcb 17 16K 18K 166960K 127 0 rtable 239 7K 7K 166960K 361 0 pf 35 14K 19K 166960K 70 0 ifaddr 43 7K 7K 166960K 52 0 ifgroup 52 2K 2K 166960K 66 0 sysctl 3 1K 9K 166960K 9 0 counters 34 17K 18K 166960K 39 0 ioctlops 0 0K 4K 166960K 84 0 iov 0 0K 12K 166960K 74 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1302 82K 82K 166960K 1536 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 3 5K 5K 166960K 4 0 VM map 2 1K 1K 166960K 2 0 sem 5 0K 0K 166960K 5 0 dirhash 12 2K 2K 166960K 12 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 18 65K 81K 166960K 252 0 sigio 0 0K 0K 166960K 7 0 proc 63 67K 83K 166960K 518 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 2 0K 0K 166960K 23 0 in_multi 100 7K 7K 166960K 104 0 ether_multi 1 0K 0K 166960K 1 0 mrt 0 0K 0K 166960K 10 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 67 307K 307K 166960K 67 0 exec 0 0K 1K 166960K 378 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 229 159K 173K 166960K 3857 0 UVM aobj 7 4K 4K 166960K 7 0 pinsyscall 39 78K 88K 166960K 1352 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 9 0 NDP 12 0K 2K 166960K 32 0 temp 36 9106K 9166K 166960K 9512 0 kqueue 14 22K 24K 166960K 39 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 40 0 37 1 0 1 1 0 8 0 rtentry 136 113 0 3 4 0 4 4 0 8 0 unpcb 144 285 0 270 4 3 1 4 0 8 0 syncache 336 5 0 5 1 1 0 1 0 8 0 tcpcb 736 34 0 30 1 0 1 1 0 8 0 arp 96 18 0 0 1 0 1 1 0 8 0 inpcb 328 320 0 311 12 10 2 12 0 8 1 nd6 112 24 0 0 1 0 1 1 0 8 0 pkpcb 40 2 0 2 1 1 0 1 0 8 0 kcovpl 48 8 0 0 1 0 1 1 0 8 0 ppxss 1072 4 0 3 2 1 1 1 0 8 0 pppxif 1416 1 0 1 1 1 0 1 0 8 0 pfstscr 40 8 0 4 1 0 1 1 0 8 0 pfanchor 1288 4 0 0 1 0 1 1 0 8 0 pfstitem 24 4 0 2 1 0 1 1 0 8 0 pfstkey 128 8 0 5 1 0 1 1 0 8 0 pfstate 384 4 0 2 1 0 1 1 0 8 0 pfrule 1360 1 0 1 1 1 0 1 0 8 0 rttmr 136 1 0 1 1 0 1 1 0 8 1 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 458 0 6 29 0 29 29 0 8 0 art_table 40 459 0 6 5 0 5 5 0 8 0 art_node 32 113 0 13 1 0 1 1 0 8 0 semapl 72 3 0 0 1 0 1 1 0 8 0 shmpl 112 4 0 0 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 1864 0 403 92 0 92 92 0 8 0 ffsino 256 1864 0 403 92 0 92 92 0 8 0 nchpl 144 2217 0 518 64 0 64 64 0 8 0 vnodes 216 2002 0 0 112 0 112 112 0 8 0 namei 1024 7026 0 7026 3 2 1 2 0 8 1 kstatmem 264 33 0 8 2 0 2 2 0 8 0 scsiplug 72 2 0 2 2 1 1 1 0 8 1 scxspl 216 7793 0 7793 4 3 1 4 1 8 1 plimitpl 152 43 0 27 1 0 1 1 0 8 0 sigapl 424 547 0 504 6 1 5 6 0 8 0 knotepl 120 6963 0 6914 15 6 9 9 0 8 7 kqueuepl 184 40 0 29 1 0 1 1 0 8 0 pipepl 304 128 0 101 3 0 3 3 0 8 0 fdescpl 448 534 0 504 4 0 4 4 0 8 0 filepl 120 2787 0 2569 11 3 8 11 0 8 1 lockfpl 104 42 0 38 1 0 1 1 0 8 0 lockfspl 48 20 0 17 1 0 1 1 0 8 0 sessionpl 144 95 0 87 1 0 1 1 0 8 0 pgrppl 48 104 0 88 1 0 1 1 0 8 0 ucredpl 104 389 0 376 1 0 1 1 0 8 0 zombiepl 144 511 0 511 1 0 1 1 0 8 1 processpl 1152 547 0 504 4 0 4 4 0 8 0 procpl 664 743 0 686 5 0 5 5 0 8 0 sosppl 176 2 0 2 1 1 0 1 0 8 0 sockpl 552 651 0 624 12 9 3 12 0 8 0 mcl64k 65536 11 0 11 1 1 0 1 0 8 0 mcl16k 16384 3 0 3 1 1 0 1 0 8 0 mcl8k 8192 8 0 8 1 1 0 1 0 8 0 mcl4k 4096 2667 0 2617 15 8 7 15 0 8 0 mcl2k 2048 264 0 264 3 2 1 3 0 8 1 mtagpl 96 4 0 4 1 1 0 1 0 8 0 mbufpl 256 5459 0 5292 14 1 13 14 0 8 0 bufpl 272 2872 0 102 185 0 185 185 0 8 0 anonpl 24 98394 0 95181 44 0 44 44 0 88 15 amapchunkpl 152 11466 0 10974 29 9 20 28 0 158 0 amappl16 200 1767 0 1744 14 0 14 14 0 8 7 amappl15 192 1 0 1 1 1 0 1 0 8 0 amappl14 184 411 0 410 1 0 1 1 0 8 0 amappl13 176 118 0 108 1 0 1 1 0 8 0 amappl12 168 770 0 741 2 0 2 2 0 8 0 amappl11 160 8 0 8 1 1 0 1 0 8 0 amappl10 152 58 0 48 1 0 1 1 0 8 0 amappl9 144 272 0 272 1 1 0 1 0 8 0 amappl8 136 94 0 93 1 0 1 1 0 8 0 amappl7 128 140 0 128 1 0 1 1 0 8 0 amappl6 120 157 0 156 1 0 1 1 0 8 0 amappl5 112 102 0 95 1 0 1 1 0 8 0 amappl4 104 260 0 242 1 0 1 1 0 8 0 amappl3 96 2145 0 2033 3 0 3 3 0 8 0 amappl2 88 523 0 468 2 0 2 2 0 8 0 amappl1 80 10465 0 9917 13 1 12 13 0 8 0 amappl 88 3150 0 2986 4 0 4 4 0 92 0 uvmvnodes 80 99 0 0 3 0 3 3 0 8 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 128 254 0 254 2 1 1 1 0 8 1 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 6 0 0 1 0 1 1 0 8 0 uaddrrnd 24 534 0 504 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 534 0 504 1 0 1 1 0 8 0 vmmpekpl 168 6180 0 6149 2 0 2 2 0 8 0 vmmpepl 168 42645 0 40829 90 0 90 90 0 357 9 vmsppl 368 533 0 504 4 1 3 4 0 8 0 rwobjpl 40 15160 0 14212 12 0 12 12 0 8 0 pdppl 4096 1074 0 1008 92 26 66 74 0 8 0 pvpl 32 250664 0 241787 117 4 113 113 0 265 27 pmappl 216 533 0 504 2 0 2 2 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 546 0 47 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(ffffffff835080c4) at panic+0x1cf sys/kern/subr_prf.c:198 chgproccnt(ee00,ffffffff) at chgproccnt+0xcc sys_setreuid(ffff8000344b7248,ffff80003b8e90e0,ffff80003b8e9030) at sys_setreuid+0x563 sys/kern/kern_prot.c:688 syscall(ffff80003b8e90e0) at syscall+0x962 mi_syscall sys/sys/syscall_mi.h:-1 [inline] syscall(ffff80003b8e90e0) at syscall+0x962 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x827acaa8500, count: -6 ddb> machine ddbcpu 1 No such command ddb> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff835080c4) at panic+0x1cf sys/kern/subr_prf.c:198 chgproccnt(ee00,ffffffff) at chgproccnt+0xcc sys_setreuid(ffff8000344b7248,ffff80003b8e90e0,ffff80003b8e9030) at sys_setreuid+0x563 sys/kern/kern_prot.c:688 syscall(ffff80003b8e90e0) at syscall+0x962 mi_syscall sys/sys/syscall_mi.h:-1 [inline] syscall(ffff80003b8e90e0) at syscall+0x962 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x827acaa8500, count: -6