panic: chgproccnt: procs < 0 Stopped at db_enter+0x25: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND *519805 92485 0 0x10 0x4000000 0 syz-executor db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff833ee998) at panic+0x1cf sys/kern/subr_prf.c:198 chgproccnt(ee00,ffffffff) at chgproccnt+0xcc sys_setreuid(ffff80002a7ccd18,ffff80002f4ff280,ffff80002f4ff1d0) at sys_setreuid+0x563 sys/kern/kern_prot.c:688 syscall(ffff80002f4ff280) at syscall+0x962 mi_syscall sys/sys/syscall_mi.h:-1 [inline] syscall(ffff80002f4ff280) at syscall+0x962 sys/arch/amd64/amd64/trap.c:765 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xd7a442e2170, 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(ffffffff833ee998) at panic+0x1cf sys/kern/subr_prf.c:198 chgproccnt(ee00,ffffffff) at chgproccnt+0xcc sys_setreuid(ffff80002a7ccd18,ffff80002f4ff280,ffff80002f4ff1d0) at sys_setreuid+0x563 sys/kern/kern_prot.c:688 syscall(ffff80002f4ff280) at syscall+0x962 mi_syscall sys/sys/syscall_mi.h:-1 [inline] syscall(ffff80002f4ff280) at syscall+0x962 sys/arch/amd64/amd64/trap.c:765 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xd7a442e2170, count: -6 ddb> show registers rdi 0 rsi 0x1 rbp 0xffff80002f4ff060 rbx 0xee00 __ALIGN_SIZE+0xde00 rdx 0xffff800001465a40 rcx 0 rax 0xffff80002a7ccd18 r8 0x101010101010101 r9 0x8080808080808080 r10 0x1821fc8906c415c9 r11 0x253b96c0b14dcde6 r12 0 r13 0xfffffd8007bfd208 r14 0 r15 0x1 rip 0xffffffff8287ba05 db_enter+0x25 cs 0x8 rflags 0x246 rsp 0xffff80002f4ff050 ss 0x10 db_enter+0x25: addq $0x8,%rsp ddb> show proc PROC (syz-executor) tid=519805 pid=92485 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=0xffff80002a7e5cb0,0xffff80002a7ccfc0 process=0xffff8000ffff8498 user=0xffff80002f4fa000, vmspace=0xfffffd806cb3f2f0 estcpu=2, cpticks=0, pctcpu=0.0, user=0, sys=0, intr=0 ddb> ps PID TID PPID UID S FLAGS WAIT COMMAND 75046 182569 82324 0 2 0 syz-executor 75046 522390 82324 0 3 0x4000080 fsleep syz-executor 75046 217541 82324 0 3 0x4000080 fsleep syz-executor 49605 281875 7815 0 2 0 syz-executor 49605 183782 7815 0 3 0x4000080 fsleep syz-executor 49605 351860 7815 0 3 0x4000080 fsleep syz-executor 32129 37172 84257 0 2 0x82000 syz-executor 32129 57732 84257 0 3 0x4002000 suspend syz-executor 92485 116548 8314 0 2 0x10 syz-executor *92485 519805 8314 0 7 0x4000010 syz-executor 92485 430067 8314 0 2 0x4000010 syz-executor 58956 161995 17583 0 2 0 syz-executor 58956 411530 17583 0 3 0x4000080 fsleep syz-executor 19143 308548 71517 0 3 0x3000 suspend syz-executor 19143 498612 71517 0 2 0x4081000 syz-executor 86760 245471 3016 0 2 0x2 sh 3016 287840 43720 0 2 0x10000002 syz-executor 17583 373879 43720 0 3 0x82 nanoslp syz-executor 8314 304915 43720 0 3 0x82 nanoslp syz-executor 71517 227206 43720 0 3 0x82 nanoslp syz-executor 7815 423782 43720 0 3 0x82 nanoslp syz-executor 60128 399862 43720 0 2 0x2 syz-executor 82324 306512 43720 0 3 0x82 nanoslp syz-executor 84257 135670 43720 0 3 0x82 nanoslp syz-executor 43720 490034 14767 0 3 0x82 kqread syz-executor 14767 186795 32498 0 3 0x10008a sigsusp ksh 32498 83790 98261 0 3 0x98 kqread sshd-session 98261 55038 12532 0 3 0x92 kqread sshd-session 23348 401406 1 0 3 0x100083 ttyin getty 12532 61383 1 0 3 0x88 kqread sshd 59811 211449 38258 73 3 0x1100090 kqread syslogd 38258 509086 1 0 3 0x100082 sbwait syslogd 65910 48602 1 0 3 0x100080 kqread resolvd 99157 220042 61596 77 3 0x100092 kqread dhcpleased 96986 70433 61596 77 3 0x100092 kqread dhcpleased 61596 158392 1 0 3 0x80 kqread dhcpleased 41299 131336 0 0 3 0x14200 bored smr 97502 342703 0 0 2 0x14200 zerothread 29641 334218 0 0 3 0x14200 aiodoned aiodoned 58582 391167 0 0 3 0x14200 syncer update 45483 53493 0 0 3 0x14200 cleaner cleaner 63702 119083 0 0 3 0x14200 reaper reaper 73275 69720 0 0 3 0x14200 pgdaemon pagedaemon 55845 298464 0 0 3 0x14200 bored viomb 23320 21410 0 0 3 0x40014200 acpi0 acpi0 76131 510369 0 0 3 0x14200 bored softnet0 68978 325470 0 0 3 0x14200 bored systqmp 14337 343044 0 0 3 0x14200 bored systq 10881 440964 0 0 3 0x40014200 tmoslp softclock 66805 97398 0 0 3 0x40014200 idle0 1 99684 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 10176 11131K 11558K 166960K 11344 0 pcb 17 14K 16K 166960K 104 0 rtable 203 6K 6K 166960K 372 0 pf 30 12K 13K 166960K 42 0 ifaddr 37 6K 7K 166960K 55 0 ifgroup 48 2K 2K 166960K 70 0 sysctl 1 1K 9K 166960K 5 0 counters 32 17K 18K 166960K 40 0 ioctlops 0 0K 2K 166960K 38 0 iov 0 0K 12K 166960K 2 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1344 85K 85K 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 4 0K 0K 166960K 5 0 dirhash 12 2K 2K 166960K 12 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 17 61K 89K 166960K 200 0 sigio 0 0K 0K 166960K 1 0 proc 63 67K 91K 166960K 498 0 subproc 72 4K 4K 166960K 81 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 5 0 in_multi 78 5K 6K 166960K 105 0 ether_multi 1 0K 0K 166960K 1 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 49 228K 228K 166960K 49 0 exec 0 0K 1K 166960K 432 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 221 142K 151K 166960K 3491 0 UVM aobj 6 2K 2K 166960K 6 0 pinsyscall 38 76K 92K 166960K 1282 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 1 0K 1K 166960K 10 0 NDP 11 0K 1K 166960K 32 0 temp 74 8660K 8728K 166960K 4248 0 kqueue 13 20K 28K 166960K 34 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 136 118 0 26 4 0 4 4 0 8 0 unpcb 144 47 0 32 1 0 1 1 0 8 0 syncache 336 3 0 3 1 1 0 1 0 8 0 tcpcb 736 32 0 26 1 0 1 1 0 8 0 arp 96 19 0 4 1 0 1 1 0 8 0 inpcb 328 167 0 158 7 6 1 7 0 8 0 nd6 112 25 0 6 1 0 1 1 0 8 0 kcovpl 48 9 0 1 1 0 1 1 0 8 0 ppxss 1072 4 0 3 2 1 1 1 0 8 0 pppxif 1384 3 0 3 2 1 1 1 0 8 1 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 469 0 100 29 0 29 29 0 8 4 art_table 40 470 0 100 5 0 5 5 0 8 0 art_node 32 118 0 34 1 0 1 1 0 8 0 semapl 112 3 0 1 1 0 1 1 0 8 0 shmpl 112 3 0 0 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 1810 0 304 95 0 95 95 0 8 0 ffsino 256 1810 0 304 95 0 95 95 0 8 0 nchpl 144 2075 0 382 63 0 63 63 0 8 0 vnodes 216 1928 0 0 108 0 108 108 0 8 0 namei 1024 6348 0 6348 3 2 1 2 0 8 1 kstatmem 264 32 0 10 2 0 2 2 0 8 0 scsiplug 72 1 0 1 1 1 0 1 0 8 0 scxspl 216 6365 0 6365 9 1 8 8 1 8 8 plimitpl 152 65 0 49 1 0 1 1 0 8 0 sigapl 424 484 0 442 6 1 5 6 0 8 0 knotepl 120 4957 0 4910 9 0 9 9 0 8 5 kqueuepl 184 34 0 24 1 0 1 1 0 8 0 pipepl 304 120 0 93 3 0 3 3 0 8 0 fdescpl 448 471 0 442 5 1 4 5 0 8 0 filepl 120 2257 0 2044 15 8 7 15 0 8 0 lockfpl 104 38 0 36 1 0 1 1 0 8 0 lockfspl 48 13 0 11 1 0 1 1 0 8 0 sessionpl 144 22 0 14 1 0 1 1 0 8 0 pgrppl 48 32 0 16 1 0 1 1 0 8 0 ucredpl 104 604 0 591 1 0 1 1 0 8 0 zombiepl 144 466 0 465 2 1 1 1 0 8 0 processpl 1152 484 0 442 4 0 4 4 0 8 0 procpl 664 595 0 544 6 0 6 6 0 8 1 sosppl 176 1 0 1 1 0 1 1 0 8 1 sockpl 552 256 0 229 8 5 3 8 0 8 0 mcl64k 65536 3 0 3 1 1 0 1 0 8 0 mcl8k 8192 5 0 5 1 1 0 1 0 8 0 mcl4k 4096 2526 0 2470 14 6 8 14 0 8 0 mcl2k 2048 301 0 299 4 3 1 4 0 8 0 mtagpl 96 9 0 4 1 0 1 1 0 8 0 mbufpl 256 4784 0 4634 18 0 18 18 0 8 1 bufpl 280 2331 0 118 159 0 159 159 0 8 0 anonpl 24 85380 0 82371 21 2 19 21 0 187 0 amapchunkpl 152 9635 0 9182 20 1 19 19 0 158 0 amappl16 200 1176 0 1156 4 2 2 4 0 8 0 amappl15 192 7 0 7 1 1 0 1 0 8 0 amappl14 184 6 0 6 1 1 0 1 0 8 0 amappl13 176 435 0 433 1 0 1 1 0 8 0 amappl12 168 803 0 766 2 0 2 2 0 8 0 amappl11 160 10 0 10 1 1 0 1 0 8 0 amappl10 152 43 0 32 1 0 1 1 0 8 0 amappl9 144 254 0 253 1 0 1 1 0 8 0 amappl8 136 19 0 18 1 0 1 1 0 8 0 amappl7 128 86 0 85 1 0 1 1 0 8 0 amappl6 120 266 0 253 1 0 1 1 0 8 0 amappl5 112 72 0 65 1 0 1 1 0 8 0 amappl4 104 377 0 354 1 0 1 1 0 8 0 amappl3 96 1552 0 1466 3 0 3 3 0 8 0 amappl2 88 565 0 500 2 0 2 2 0 8 0 amappl1 80 8938 0 8412 12 0 12 12 0 8 0 amappl 88 2790 0 2636 4 0 4 4 0 92 0 uvmvnodes 80 97 0 0 2 0 2 2 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 128 253 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 24 471 0 442 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 471 0 442 1 0 1 1 0 8 0 vmmpekpl 168 5493 0 5453 2 0 2 2 0 8 0 vmmpepl 168 37041 0 35330 80 2 78 79 0 357 0 vmsppl 368 470 0 442 4 1 3 4 0 8 0 rwobjpl 40 12915 0 11997 10 0 10 10 0 8 0 pdppl 4096 949 0 884 97 30 67 79 0 8 2 pvpl 32 217558 0 208885 82 3 79 79 0 265 7 pmappl 216 470 0 442 2 0 2 2 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 375 0 48 11 0 11 11 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(ffffffff833ee998) at panic+0x1cf sys/kern/subr_prf.c:198 chgproccnt(ee00,ffffffff) at chgproccnt+0xcc sys_setreuid(ffff80002a7ccd18,ffff80002f4ff280,ffff80002f4ff1d0) at sys_setreuid+0x563 sys/kern/kern_prot.c:688 syscall(ffff80002f4ff280) at syscall+0x962 mi_syscall sys/sys/syscall_mi.h:-1 [inline] syscall(ffff80002f4ff280) at syscall+0x962 sys/arch/amd64/amd64/trap.c:765 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xd7a442e2170, 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(ffffffff833ee998) at panic+0x1cf sys/kern/subr_prf.c:198 chgproccnt(ee00,ffffffff) at chgproccnt+0xcc sys_setreuid(ffff80002a7ccd18,ffff80002f4ff280,ffff80002f4ff1d0) at sys_setreuid+0x563 sys/kern/kern_prot.c:688 syscall(ffff80002f4ff280) at syscall+0x962 mi_syscall sys/sys/syscall_mi.h:-1 [inline] syscall(ffff80002f4ff280) at syscall+0x962 sys/arch/amd64/amd64/trap.c:765 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xd7a442e2170, count: -6