panic: chgproccnt: procs < 0 Stopped at db_enter+0x25: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND 17085 17497 0 0 0 0 syz-executor * 12911 54486 0 0x10 0x4000000 1K syz-executor db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff8334f6a2) at panic+0x1e5 sys/kern/subr_prf.c:198 chgproccnt(ee00,ffffffff) at chgproccnt+0xcc sys/kern/kern_proc.c:171 sys_setreuid(ffff8000fffe3c58,ffff80003b0062f0,ffff80003b006240) at sys_setreuid+0x587 sys/kern/kern_prot.c:688 syscall(ffff80003b0062f0) at syscall+0xb08 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003b0062f0) at syscall+0xb08 sys/arch/amd64/amd64/trap.c:579 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xd9922ec540, 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: chgproccnt: procs < 0 ddb{1}> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff8334f6a2) at panic+0x1e5 sys/kern/subr_prf.c:198 chgproccnt(ee00,ffffffff) at chgproccnt+0xcc sys/kern/kern_proc.c:171 sys_setreuid(ffff8000fffe3c58,ffff80003b0062f0,ffff80003b006240) at sys_setreuid+0x587 sys/kern/kern_prot.c:688 syscall(ffff80003b0062f0) at syscall+0xb08 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003b0062f0) at syscall+0xb08 sys/arch/amd64/amd64/trap.c:579 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xd9922ec540, count: -6 ddb{1}> show registers rdi 0 rsi 0x1 rbp 0xffff80003b0060b0 rbx 0xffff8000299dedcf rdx 0 rcx 0xffff8000fffe3c58 rax 0xffff8000299ddff0 r8 0x101010101010101 r9 0x8080808080808080 r10 0x73f4870ef5685e34 r11 0x2f09ea872ad197df r12 0xffff8000299debd0 r13 0 r14 0 r15 0x1 rip 0xffffffff82d95d35 db_enter+0x25 cs 0x8 rflags 0x246 rsp 0xffff80003b0060a0 ss 0x10 db_enter+0x25: addq $0x8,%rsp ddb{1}> show proc PROC (syz-executor) tid=12911 pid=54486 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=0xffff8000fffe2548,0xffff8000fffe3228 process=0xffff8000fffe97c0 user=0xffff80003b001000, vmspace=0xfffffd8068c045b8 estcpu=36, cpticks=0, pctcpu=0.0, user=0, sys=0, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 17497 17085 10827 0 7 0 syz-executor 17497 374516 10827 0 2 0x4000000 syz-executor 17497 357940 10827 0 3 0x4000080 fsleep syz-executor 54486 67730 83789 0 2 0x10 syz-executor *54486 12911 83789 0 7 0x4000010 syz-executor 54486 73607 83789 0 2 0x4000010 syz-executor 61969 412413 46698 0 2 0 syz-executor 61969 153006 46698 0 3 0x4000080 fsleep syz-executor 61969 217101 46698 0 2 0x4000000 syz-executor 93025 307759 55980 0 3 0x80 nanoslp syz-executor 93025 403714 55980 0 3 0x4000080 sbwait syz-executor 93025 301118 55980 0 3 0x4000080 fsleep syz-executor 93025 27800 55980 0 3 0x4000080 fsleep syz-executor 58195 6545 53694 0 3 0x1 inode syz-executor 58195 27821 53694 0 3 0x4000080 msgwait syz-executor 58195 140481 53694 0 3 0x4000080 fsleep syz-executor 58195 440991 53694 0 3 0x4000080 fsleep syz-executor 42128 109356 0 0 3 0x14200 bored sosplice 85681 514110 90705 0 2 0x3 syz-executor 53694 370277 90705 0 3 0x3 inode syz-executor 55980 461286 90705 0 3 0x3 inode syz-executor 83789 23839 90705 0 3 0x3 inode syz-executor 46698 304081 90705 0 2 0x3 syz-executor 10827 432318 90705 0 3 0x3 inode syz-executor 81380 241101 90705 0 3 0x82 wait syz-executor 57708 324947 90705 0 3 0x10000003 inode syz-executor 90705 22438 36775 0 3 0x82 kqread syz-executor 36775 152415 71347 0 3 0x10008a sigsusp ksh 71347 189859 90313 0 3 0x98 kqread sshd-session 90313 472195 77311 0 3 0x92 kqread sshd-session 28283 219798 1 0 3 0x100083 ttyin getty 77311 259174 1 0 3 0x88 kqread sshd 51528 384802 4743 74 3 0x1100092 bpf pflogd 4743 267386 1 0 3 0x80 sbwait pflogd 62381 301718 2147 73 3 0x1100090 kqread syslogd 2147 477119 1 0 3 0x100082 sbwait syslogd 29440 78908 1 0 3 0x100080 kqread resolvd 19259 277880 43239 77 3 0x100092 kqread dhcpleased 90521 73274 43239 77 3 0x100092 kqread dhcpleased 43239 389722 1 0 3 0x80 kqread dhcpleased 5856 255757 0 0 3 0x14200 bored smr 58966 229511 0 0 2 0x14200 zerothread 94856 307746 0 0 3 0x14200 aiodoned aiodoned 78205 157583 0 0 3 0x14200 syncer update 57438 187069 0 0 3 0x14200 cleaner cleaner 48537 311663 0 0 3 0x14200 reaper reaper 9147 381616 0 0 3 0x14200 pgdaemon pagedaemon 44795 451229 0 0 3 0x14200 bored viomb 54658 11554 0 0 3 0x40014200 acpi0 acpi0 3372 502383 0 0 3 0x40014200 idle1 71542 310521 0 0 3 0x14200 bored softnet3 73070 282179 0 0 3 0x14200 bored softnet2 35795 108319 0 0 3 0x14200 bored softnet1 75103 340040 0 0 3 0x14200 bored softnet0 3070 335269 0 0 3 0x14200 bored systqmp 46840 166503 0 0 3 0x14200 bored systq 62489 89871 0 0 3 0x14200 tmoslp softclockmp 63282 3583 0 0 3 0x40014200 tmoslp softclock 37608 31668 0 0 3 0x40014200 idle0 1 516688 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks Process 17497 (syz-executor) thread 0xffff8000fffe2a68 (374516) exclusive rwlock rlimitlk r = 0 (0xffffffff837e4778) #0 witness_lock+0x5bb stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5bb sys/kern/subr_witness.c:1160 #1 rw_do_enter_write+0x3ea sys/kern/kern_rwlock.c:316 #2 dosetrlimit+0xb7 sys/kern/kern_resource.c:257 #3 sys_setrlimit+0x124 sys/kern/kern_resource.c:241 #4 syscall+0xbc6 mi_syscall sys/sys/syscall_mi.h:176 [inline] #4 syscall+0xbc6 sys/arch/amd64/amd64/trap.c:579 #5 Xsyscall+0x128 Process 54486 (syz-executor) thread 0xffff8000fffe3c58 (12911) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff838c6a00) #0 witness_lock+0x5bb stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5bb sys/kern/subr_witness.c:1160 #1 __mp_acquire_count+0x58 sys/kern/kern_lock.c:-1 #2 mi_switch+0x4b7 sys/kern/sched_bsd.c:441 #3 yield+0x6a sys/kern/sched_bsd.c:320 #4 malloc+0xe5 sys/kern/kern_malloc.c:174 #5 uid_find+0xab sys/kern/kern_proc.c:136 #6 chgproccnt+0x39 sys/kern/kern_proc.c:-1 #7 sys_setreuid+0x587 sys/kern/kern_prot.c:688 #8 syscall+0xb08 mi_syscall sys/sys/syscall_mi.h:176 [inline] #8 syscall+0xb08 sys/arch/amd64/amd64/trap.c:579 #9 Xsyscall+0x128 Process 61969 (syz-executor) thread 0xffff8000fffe2548 (217101) exclusive rwlock vmmaplk r = 0 (0xfffffd8068c04e38) #0 witness_lock+0x5bb stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5bb sys/kern/subr_witness.c:1160 #1 rw_do_enter_write+0x3ea sys/kern/kern_rwlock.c:316 #2 vm_map_lock_ln+0x12e sys/uvm/uvm_map.c:5250 #3 uvmfault_lookup+0xe8 sys/uvm/uvm_fault.c:1918 #4 uvm_fault_check+0x8a5 uvmfault_amapcopy sys/uvm/uvm_fault.c:235 [inline] #4 uvm_fault_check+0x8a5 sys/uvm/uvm_fault.c:784 #5 uvm_fault+0x106 sys/uvm/uvm_fault.c:677 #6 upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:188 #7 usertrap+0x2d8 sys/arch/amd64/amd64/trap.c:436 #8 recall_trap+0x8 Process 46698 (syz-executor) thread 0xffff80002a2aa538 (304081) exclusive rrwlock inode r = 0 (0xfffffd806df4b0c0) #0 witness_lock+0x5bb stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5bb sys/kern/subr_witness.c:1160 #1 rw_do_enter_write+0x3ea sys/kern/kern_rwlock.c:316 #2 rrw_enter+0xc6 sys/kern/kern_rwlock.c:616 #3 VOP_LOCK+0xa6 sys/kern/vfs_vops.c:527 #4 vn_lock+0xa4 sys/kern/vfs_vnops.c:570 #5 vget+0x2bd sys/kern/vfs_subr.c:693 #6 ktrwriteraw+0x172 sys/kern/kern_ktrace.c:688 #7 ktrsyscall+0x32b ktrwrite sys/kern/kern_ktrace.c:-1 [inline] #7 ktrsyscall+0x32b sys/kern/kern_ktrace.c:183 #8 syscall+0x2e6 mi_syscall sys/sys/syscall_mi.h:154 [inline] #8 syscall+0x2e6 sys/arch/amd64/amd64/trap.c:579 #9 Xsyscall+0x128 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10202 11033K 11290K 166960K 11651 0 pcb 17 12K 12K 166960K 37 0 rtable 238 8K 9K 166960K 410 0 pf 34 17K 18K 166960K 60 0 ifaddr 42 7K 8K 166960K 59 0 ifgroup 55 2K 2K 166960K 76 0 sysctl 3 1K 1K 166960K 3 0 counters 66 36K 37K 166960K 158 0 ioctlops 0 0K 4K 166960K 1540 0 iov 0 0K 12K 166960K 38 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1339 84K 85K 166960K 1470 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 5K 166960K 3 0 VM map 2 1K 1K 166960K 2 0 sem 6 2K 2K 166960K 9 0 dirhash 12 2K 2K 166960K 12 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 17 61K 89K 166960K 281 0 sigio 0 0K 0K 166960K 1 0 proc 72 91K 128K 166960K 562 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 9 0 in_multi 98 7K 7K 166960K 120 0 ether_multi 1 0K 0K 166960K 3 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 73 334K 334K 166960K 73 0 exec 0 0K 1K 166960K 460 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 251 169K 178K 166960K 4237 0 UVM aobj 6 2K 2K 166960K 6 0 pinsyscall 42 84K 107K 166960K 1385 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 7 0 NDP 12 0K 2K 166960K 37 0 temp 53 8664K 8728K 166960K 15117 0 kqueue 13 20K 28K 166960K 48 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 26 0 0 1 0 1 1 0 8 0 rtpcb 120 109 0 105 3 0 3 3 0 8 2 rtentry 176 126 0 19 6 0 6 6 0 8 0 unpcb 144 95 0 77 2 1 1 2 0 8 0 syncache 336 3 0 3 1 1 0 1 0 8 0 tcpcb 808 39 0 35 1 0 1 1 0 8 0 arp 128 20 0 4 1 0 1 1 0 8 0 inpcb 384 160 0 153 3 1 2 2 0 8 1 nd6 144 27 0 3 1 0 1 1 0 8 0 pkpcb 40 3 0 2 2 1 1 1 0 8 0 kcovpl 48 9 0 1 1 0 1 1 0 8 0 ppxss 1192 43 0 43 2 1 1 1 0 8 1 pppxif 1504 34 0 34 1 1 0 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 pfstitem 24 29 0 0 1 0 1 1 0 8 0 pfstkey 128 29 0 0 1 0 1 1 0 8 0 pfstate 384 29 0 0 3 0 3 3 0 8 0 pfrule 1344 21 0 16 2 1 1 2 0 8 0 art_heap8 4096 2 0 0 2 0 2 2 0 8 0 art_heap4 256 505 0 54 29 0 29 29 0 8 0 art_table 32 507 0 54 4 0 4 4 0 8 0 art_node 16 123 0 26 1 0 1 1 0 8 0 sysvmsgpl 40 5 0 4 2 1 1 1 0 8 0 semupl 112 1 0 1 1 1 0 1 0 8 0 semapl 112 4 0 0 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 1805 0 296 95 0 95 95 0 8 0 ffsino 288 1805 0 296 109 0 109 109 0 8 0 nchpl 144 2195 0 502 63 0 63 63 0 8 0 rtmask 32 4 0 4 2 1 1 1 0 8 1 uvmvnodes 80 1964 0 0 41 0 41 41 0 8 0 vnodes 216 1964 0 0 110 0 110 110 0 8 0 namei 1024 7035 0 7035 3 2 1 2 0 8 1 percpumem 16 94 0 46 1 0 1 1 0 8 0 kstatmem 264 40 0 14 3 1 2 3 0 8 0 scsiplug 72 2 0 2 1 1 0 1 0 8 0 scxspl 216 7351 0 7351 9 8 1 8 1 8 1 plimitpl 152 43 0 24 1 0 1 1 0 8 0 sigapl 424 578 0 527 7 1 6 7 0 8 0 knotepl 120 498 0 0 16 0 16 16 0 8 0 kqueuepl 224 57 0 48 1 0 1 1 0 8 0 pipepl 336 114 0 87 3 0 3 3 0 8 0 fdescpl 520 559 0 528 3 0 3 3 0 8 0 filepl 160 2456 0 2236 13 0 13 13 0 8 1 lockfpl 104 49 0 47 1 0 1 1 0 8 0 lockfspl 48 21 0 19 1 0 1 1 0 8 0 sessionpl 144 23 0 14 1 0 1 1 0 8 0 pgrppl 48 33 0 16 1 0 1 1 0 8 0 ucredpl 104 197 0 181 1 0 1 1 0 8 0 zombiepl 144 545 0 542 1 0 1 1 0 8 0 processpl 1208 578 0 527 6 1 5 5 0 8 0 procpl 656 825 0 762 6 0 6 6 0 8 0 srpgc 96 4 0 4 1 1 0 1 0 8 0 sosppl 168 1 0 1 1 1 0 1 0 8 0 sockpl 728 368 0 338 10 1 9 9 0 8 5 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 124 0 0 16 0 16 16 0 8 0 mcl2k 2048 19 0 0 3 0 3 3 0 8 0 mtagpl 96 13 0 0 1 0 1 1 0 8 0 mbufpl 256 1134 0 0 71 0 71 71 0 8 0 bufpl 280 2675 0 122 183 0 183 183 0 8 0 anonpl 32 3882 0 0 32 0 32 32 0 246 0 amapchunkpl 152 12630 0 12112 27 4 23 24 0 158 1 amappl16 200 1912 0 1883 5 3 2 5 0 8 0 amappl15 192 25 0 25 1 1 0 1 0 8 0 amappl14 184 113 0 101 1 0 1 1 0 8 0 amappl13 176 4 0 3 1 0 1 1 0 8 0 amappl12 168 1213 0 1182 3 0 3 3 0 8 0 amappl11 160 53 0 39 1 0 1 1 0 8 0 amappl10 152 21 0 21 2 1 1 1 0 8 1 amappl9 144 251 0 251 1 1 0 1 0 8 0 amappl8 136 48 0 46 1 0 1 1 0 8 0 amappl7 128 127 0 115 1 0 1 1 0 8 0 amappl6 120 182 0 179 1 0 1 1 0 8 0 amappl5 112 124 0 115 1 0 1 1 0 8 0 amappl4 104 309 0 290 1 0 1 1 0 8 0 amappl3 96 2199 0 2083 4 0 4 4 0 8 0 amappl2 88 643 0 580 2 0 2 2 0 8 0 amappl1 80 8714 0 8114 15 1 14 15 0 8 0 amappl 88 3526 0 3350 5 0 5 5 0 92 0 dma32768 32768 1 0 1 1 1 0 1 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 24 559 0 528 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 559 0 528 1 0 1 1 0 8 0 vmmpekpl 168 6225 0 6182 4 1 3 3 0 8 0 vmmpepl 168 41479 0 39496 92 2 90 90 0 357 0 vmsppl 480 558 0 528 5 0 5 5 0 8 0 rwobjpl 72 15888 0 12977 54 0 54 54 0 8 0 pdppl 4096 1125 0 1056 105 34 71 85 0 8 2 pvpl 32 10384 0 0 85 1 84 84 0 265 0 pmappl 256 558 0 528 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 450 0 40 13 0 13 13 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp x86_ipi_db(ffffffff83844ff0) 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 end of kernel end trace frame: 0x772a6a1e2d60, count: 12 ddb{0}> trace x86_ipi_db(ffffffff83844ff0) 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 end of kernel end trace frame: 0x772a6a1e2d60, count: -3 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(ffffffff8334f6a2) at panic+0x1e5 sys/kern/subr_prf.c:198 chgproccnt(ee00,ffffffff) at chgproccnt+0xcc sys/kern/kern_proc.c:171 sys_setreuid(ffff8000fffe3c58,ffff80003b0062f0,ffff80003b006240) at sys_setreuid+0x587 sys/kern/kern_prot.c:688 syscall(ffff80003b0062f0) at syscall+0xb08 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003b0062f0) at syscall+0xb08 sys/arch/amd64/amd64/trap.c:579 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xd9922ec540, count: 9 ddb{1}> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff8334f6a2) at panic+0x1e5 sys/kern/subr_prf.c:198 chgproccnt(ee00,ffffffff) at chgproccnt+0xcc sys/kern/kern_proc.c:171 sys_setreuid(ffff8000fffe3c58,ffff80003b0062f0,ffff80003b006240) at sys_setreuid+0x587 sys/kern/kern_prot.c:688 syscall(ffff80003b0062f0) at syscall+0xb08 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003b0062f0) at syscall+0xb08 sys/arch/amd64/amd64/trap.c:579 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xd9922ec540, count: -6