panic: chgproccnt: procs < 0 Stopped at db_enter+0x25: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND 333546 11311 0 0x10 0x4000000 1 syz-executor *310412 11311 0 0x10 0x4000000 0K syz-executor db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff8354233c) at panic+0x1e5 sys/kern/subr_prf.c:198 chgproccnt(ee00,ffffffff) at chgproccnt+0xcc sys_setresuid(ffff8000fffe8d18,ffff8000353881f0,ffff800035388140) at sys_setresuid+0x577 sys/kern/kern_prot.c:421 syscall(ffff8000353881f0) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff8000353881f0) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xa3173965730, 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{0}> ddb{0}> set $lines = 0 ddb{0}> set $maxwidth = 0 ddb{0}> show panic *cpu0: chgproccnt: procs < 0 ddb{0}> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff8354233c) at panic+0x1e5 sys/kern/subr_prf.c:198 chgproccnt(ee00,ffffffff) at chgproccnt+0xcc sys_setresuid(ffff8000fffe8d18,ffff8000353881f0,ffff800035388140) at sys_setresuid+0x577 sys/kern/kern_prot.c:421 syscall(ffff8000353881f0) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff8000353881f0) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xa3173965730, count: -6 ddb{0}> show registers rdi 0 rsi 0x1 rbp 0xffff800035387fb0 rbx 0xffffffff83943e07 cpu_info_full_primary+0x2e07 rdx 0xffff8000015f56c0 rcx 0xffff8000fffe8d18 rax 0xffffffff83942ff0 cpu_info_full_primary+0x1ff0 r8 0x101010101010101 r9 0x8080808080808080 r10 0x299926e9f6585fbb r11 0x8f918e3386c39f5c r12 0xffffffff83943c08 cpu_info_full_primary+0x2c08 r13 0 r14 0 r15 0x1 rip 0xffffffff82a40265 db_enter+0x25 cs 0x8 rflags 0x246 rsp 0xffff800035387fa0 ss 0x10 db_enter+0x25: addq $0x8,%rsp ddb{0}> show proc PROC (syz-executor) tid=310412 pid=11311 tcnt=3 stat=onproc flags process=10 proc=4000000 runpri=74, usrpri=74, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff80002a220a78,0xffff8000fffe8a90 process=0xffff8000fffef038 user=0xffff800035383000, vmspace=0xfffffd806f31eb78 estcpu=24, cpticks=0, pctcpu=0.0, user=0, sys=0, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 40739 139671 98898 0 2 0 syz-executor 40739 30165 98898 0 3 0x4000080 fsleep syz-executor 31695 354312 22132 0 2 0 syz-executor 31695 179813 22132 0 2 0x4000000 syz-executor 37434 318081 13827 0 2 0 syz-executor 11311 469963 26376 0 2 0x10 syz-executor 11311 333546 26376 0 7 0x4000010 syz-executor *11311 310412 26376 0 7 0x4000010 syz-executor 91555 48771 29978 0 2 0 syz-executor 91555 440920 29978 0 3 0x4000080 fsleep syz-executor 91555 404481 29978 0 3 0x4000080 fsleep syz-executor 65469 20604 6421 0 2 0 syz-executor 65469 104865 6421 0 3 0x4000080 fsleep syz-executor 65469 308167 6421 0 3 0x4000080 fsleep syz-executor 73717 63157 0 0 3 0x14280 nfsidl nfsio 89147 274170 0 0 3 0x14280 nfsidl nfsio 45819 423197 0 0 3 0x14280 nfsidl nfsio 58089 142149 0 0 3 0x14280 nfsidl nfsio 69155 411185 0 0 3 0x14280 nfsidl nfsio 94088 523550 0 0 3 0x14280 nfsidl nfsio 6196 84349 0 0 3 0x14280 nfsidl nfsio 37369 219261 0 0 3 0x14280 nfsidl nfsio 96406 187751 0 0 3 0x14280 nfsidl nfsio 85944 490628 0 0 3 0x14280 nfsidl nfsio 59949 400347 0 0 3 0x14280 nfsidl nfsio 21825 42766 0 0 3 0x14280 nfsidl nfsio 57813 270964 0 0 3 0x14280 nfsidl nfsio 9999 254330 0 0 3 0x14280 nfsidl nfsio 30273 266770 0 0 3 0x14280 nfsidl nfsio 26982 369406 0 0 3 0x14280 nfsidl nfsio 73044 385418 0 0 3 0x14280 nfsidl nfsio 50284 309971 0 0 3 0x14280 nfsidl nfsio 14595 449359 0 0 3 0x14280 nfsidl nfsio 21708 171750 0 0 3 0x14280 nfsidl nfsio 99535 5882 1 0 3 0x82 nanoslp getty 6421 27973 82837 0 2 0x3 syz-executor 22132 457201 82837 0 2 0x3 syz-executor 12478 169466 82837 0 2 0x3 syz-executor 98898 337474 82837 0 3 0x82 nanoslp syz-executor 29978 143889 82837 0 2 0x3 syz-executor 13827 55247 82837 0 2 0x3 syz-executor 46128 378153 82837 0 3 0x82 nanoslp syz-executor 26376 262930 82837 0 2 0x3 syz-executor 82837 431668 1 0 3 0x82 kqread syz-executor 7075 449300 38967 74 3 0x1100092 bpf pflogd 38967 57141 1 0 3 0x80 sbwait pflogd 73218 164477 1 73 3 0x1100090 kqread syslogd 16988 321430 0 0 3 0x14200 bored smr 69198 31236 0 0 2 0x14200 zerothread 84425 359114 0 0 3 0x14200 aiodoned aiodoned 15572 83214 0 0 3 0x14200 syncer update 41623 236526 0 0 3 0x14200 cleaner cleaner 8608 309967 0 0 3 0x14200 reaper reaper 55153 357563 0 0 3 0x14200 pgdaemon pagedaemon 26476 182598 0 0 3 0x14200 bored viomb 41617 284234 0 0 3 0x40014200 acpi0 acpi0 8781 147611 0 0 3 0x40014200 idle1 6950 79227 0 0 3 0x14200 bored softnet1 75673 408273 0 0 3 0x14200 bored softnet0 8216 91532 0 0 3 0x14200 bored systqmp 33753 107904 0 0 3 0x14200 bored systq 57853 461849 0 0 3 0x14200 tmoslp softclockmp 17234 477992 0 0 3 0x40014200 tmoslp softclock 95718 227963 0 0 3 0x40014200 idle0 1 32284 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks Process 37434 (syz-executor) thread 0xffff80002a2214d8 (318081) exclusive rwlock vmmaplk r = 0 (0xfffffd806f31ee60) #0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160 #1 rw_do_enter_read+0x3e8 sys/kern/kern_rwlock.c:413 #2 uvmfault_lookup+0x122 sys/uvm/uvm_fault.c:1880 #3 uvm_fault_check+0x4f sys/uvm/uvm_fault.c:693 #4 uvm_fault+0x106 sys/uvm/uvm_fault.c:627 #5 upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:192 #6 usertrap+0x430 sys/arch/amd64/amd64/trap.c:640 #7 recall_trap+0x8 Process 11311 (syz-executor) thread 0xffff8000fffe8d18 (310412) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff83b2ee80) #0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160 #1 __mp_acquire_count+0x58 sys/kern/kern_lock.c:-1 #2 malloc+0xe3 sys/kern/kern_malloc.c:175 #3 uid_find+0xab sys/kern/kern_proc.c:136 #4 chgproccnt+0x39 sys/kern/kern_proc.c:-1 #5 sys_setresuid+0x577 sys/kern/kern_prot.c:421 #6 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] #6 syscall+0xb17 sys/arch/amd64/amd64/trap.c:783 #7 Xsyscall+0x128 ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 11050 12089K 12214K 166960K 12187 0 pcb 18 12K 12K 166960K 42 0 rtable 235 8K 9K 166960K 411 0 pf 32 17K 19K 166960K 51 0 ifaddr 39 6K 7K 166960K 47 0 ifgroup 51 2K 2K 166960K 59 0 sysctl 1 1K 9K 166960K 5 0 counters 68 36K 37K 166960K 74 0 ioctlops 0 0K 4K 166960K 1526 0 iov 0 0K 1K 166960K 68 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1321 83K 84K 166960K 1446 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 6 0K 0K 166960K 48 0 dirhash 12 2K 2K 166960K 12 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 17 61K 93K 166960K 210 0 sigio 0 0K 0K 166960K 5 0 proc 32 50K 180K 166960K 570 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 9 0 in_multi 88 6K 7K 166960K 105 0 ether_multi 1 0K 0K 166960K 3 0 mrt 1 0K 0K 166960K 8 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 61 281K 281K 166960K 61 0 exec 0 0K 1K 166960K 389 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 167 99K 162K 166960K 3736 0 UVM aobj 4 2K 2K 166960K 4 0 pinsyscall 25 50K 109K 166960K 1370 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 NDP 11 0K 1K 166960K 30 0 temp 40 9115K 9131K 166960K 7276 0 kqueue 3 4K 22K 166960K 29 0 SYN cache 2 16K 16K 166960K 2 0 ddb{0}> 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 43 0 43 1 0 1 1 0 8 1 rtentry 176 117 0 17 6 0 6 6 0 8 0 unpcb 144 79 0 73 1 0 1 1 0 8 0 syncache 336 4 0 4 1 1 0 1 0 8 0 tcpcb 736 27 0 24 1 0 1 1 0 8 0 arp 136 19 0 3 1 0 1 1 0 8 0 inpcb 328 156 0 152 4 2 2 4 0 8 1 nd6 152 24 0 3 1 0 1 1 0 8 0 kcovpl 48 8 0 0 1 0 1 1 0 8 0 ppxss 1192 2 0 2 1 0 1 1 0 8 1 pffrag 232 2 0 2 1 0 1 1 0 482 1 pffrnode 88 2 0 2 1 0 1 1 0 8 1 pffrent 40 5 0 5 1 0 1 1 0 8 1 pfosfp 40 1428 0 1005 5 0 5 5 0 8 0 pfosfpen 112 1428 0 714 21 0 21 21 0 8 0 pfsrclim 320 1 0 0 1 0 1 1 0 8 0 pfstitem 24 31 0 0 1 0 1 1 0 8 0 pfstkey 128 31 0 0 1 0 1 1 0 8 0 pfstate 448 31 0 0 4 0 4 4 0 8 0 pfrule 1360 22 0 17 2 1 1 2 0 8 0 rttmr 136 1 0 1 1 0 1 1 0 8 1 art_heap8 4096 2 0 0 2 0 2 2 0 8 0 art_heap4 256 492 0 76 31 0 31 31 0 8 4 art_table 40 494 0 76 5 0 5 5 0 8 0 art_node 32 116 0 25 1 0 1 1 0 8 0 sysvmsgpl 40 1 0 1 1 1 0 1 0 8 0 semupl 112 2 0 2 1 0 1 1 0 8 1 semapl 72 44 0 40 1 0 1 1 0 8 0 shmpl 112 2 0 0 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 1713 0 248 93 0 93 93 0 8 1 ffsino 296 1713 0 248 114 0 114 114 0 8 0 nchpl 144 2016 0 313 64 0 64 64 0 8 0 vnodes 216 1856 0 0 104 0 104 104 0 8 0 namei 1024 6287 0 6287 3 2 1 2 0 8 1 percpumem 16 52 0 3 1 0 1 1 0 8 0 kstatmem 264 31 0 6 2 0 2 2 0 8 0 scxspl 216 6894 0 6894 4 3 1 3 1 8 1 plimitpl 152 37 0 25 1 0 1 1 0 8 0 sigapl 424 548 0 490 8 1 7 7 0 8 0 knotepl 120 56 0 0 2 0 2 2 0 8 0 kqueuepl 224 68 0 66 3 2 1 3 0 8 0 pipepl 344 131 0 104 3 0 3 3 0 8 0 fdescpl 528 512 0 490 3 0 3 3 0 8 0 filepl 160 2159 0 1977 14 4 10 14 0 8 0 lockfpl 104 51 0 48 1 0 1 1 0 8 0 lockfspl 48 25 0 22 1 0 1 1 0 8 0 sessionpl 144 26 0 22 1 0 1 1 0 8 0 pgrppl 48 34 0 22 1 0 1 1 0 8 0 ucredpl 104 160 0 151 1 0 1 1 0 8 0 zombiepl 144 537 0 536 2 1 1 1 0 8 0 processpl 1232 548 0 490 5 0 5 5 0 8 0 procpl 664 695 0 629 8 1 7 7 0 8 1 sockpl 752 279 0 269 7 3 4 7 0 8 2 mcl64k 65536 3 0 0 1 0 1 1 0 8 0 mcl16k 16384 2 0 0 1 0 1 1 0 8 0 mcl9k128 9344 2 0 0 1 0 1 1 0 8 0 mcl8k 8192 2 0 0 1 0 1 1 0 8 0 mcl4k 4096 129 0 0 17 0 17 17 0 8 0 mcl2k2 2112 1 0 0 1 0 1 1 0 8 0 mcl2k 2048 25 0 0 4 0 4 4 0 8 0 mtagpl 96 4 0 0 1 0 1 1 0 8 0 mbufpl 256 197 0 0 13 0 13 13 0 8 0 bufpl 272 2512 0 106 161 0 161 161 0 8 0 anonpl 32 5573 0 0 45 0 45 45 0 246 0 amapchunkpl 152 10387 0 9979 27 0 27 27 0 158 7 amappl16 200 1339 0 1322 4 2 2 4 0 8 0 amappl15 192 4 0 4 1 1 0 1 0 8 0 amappl14 184 435 0 435 1 0 1 1 0 8 1 amappl13 176 143 0 139 1 0 1 1 0 8 0 amappl12 168 763 0 742 2 0 2 2 0 8 0 amappl11 160 4 0 3 1 0 1 1 0 8 0 amappl10 152 67 0 61 1 0 1 1 0 8 0 amappl9 144 273 0 273 1 1 0 1 0 8 0 amappl8 136 151 0 150 1 0 1 1 0 8 0 amappl7 128 147 0 140 1 0 1 1 0 8 0 amappl6 120 169 0 168 1 0 1 1 0 8 0 amappl5 112 96 0 92 1 0 1 1 0 8 0 amappl4 104 291 0 280 1 0 1 1 0 8 0 amappl3 96 1951 0 1862 4 0 4 4 0 8 1 amappl2 88 545 0 524 2 0 2 2 0 8 0 amappl1 80 10828 0 10617 15 0 15 15 0 8 4 amappl 88 2997 0 2859 5 0 5 5 0 92 0 uvmvnodes 80 102 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 128 253 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 4 0 0 1 0 1 1 0 8 0 uaddrrnd 24 512 0 490 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 512 0 490 1 0 1 1 0 8 0 vmmpekpl 168 6271 0 6236 3 0 3 3 0 8 0 vmmpepl 168 41555 0 40480 88 1 87 87 0 357 24 vmsppl 488 511 0 490 5 0 5 5 0 8 1 rwobjpl 80 14863 0 14299 24 1 23 24 0 8 0 pdppl 4096 1031 0 980 99 28 71 85 0 8 20 pvpl 32 13355 0 0 108 0 108 108 0 265 0 pmappl 256 511 0 490 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 443 0 34 12 0 12 12 0 8 0 ddb{0}> machine ddbcpu 0 Invalid cpu 0 ddb{0}> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff8354233c) at panic+0x1e5 sys/kern/subr_prf.c:198 chgproccnt(ee00,ffffffff) at chgproccnt+0xcc sys_setresuid(ffff8000fffe8d18,ffff8000353881f0,ffff800035388140) at sys_setresuid+0x577 sys/kern/kern_prot.c:421 syscall(ffff8000353881f0) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff8000353881f0) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xa3173965730, count: -6 ddb{0}> machine ddbcpu 1 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp x86_ipi_db(ffff80002999dff0) 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 __mp_lock(ffffffff83b2e680) at __mp_lock+0x1a3 __mp_lock_spin sys/kern/kern_lock.c:142 [inline] __mp_lock(ffffffff83b2e680) at __mp_lock+0x1a3 sys/kern/kern_lock.c:173 __mp_acquire_count(ffffffff83b2e680,1) at __mp_acquire_count+0x58 sys/kern/kern_lock.c:-1 malloc(28,29,9) at malloc+0xe3 sys/kern/kern_malloc.c:175 uid_find(ee00) at uid_find+0xab sys/kern/kern_proc.c:136 chgproccnt(ee00,1) at chgproccnt+0x39 sys/kern/kern_proc.c:-1 sys_setreuid(ffff80002a220a78,ffff80003c3e8730,ffff80003c3e8680) at sys_setreuid+0x57b crfree sys/kern/kern_prot.c:971 [inline] sys_setreuid(ffff80002a220a78,ffff80003c3e8730,ffff80003c3e8680) at sys_setreuid+0x57b sys/kern/kern_prot.c:690 syscall(ffff80003c3e8730) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c3e8730) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xa312c3ee7e0, count: 4 ddb{1}> trace x86_ipi_db(ffff80002999dff0) 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 __mp_lock(ffffffff83b2e680) at __mp_lock+0x1a3 __mp_lock_spin sys/kern/kern_lock.c:142 [inline] __mp_lock(ffffffff83b2e680) at __mp_lock+0x1a3 sys/kern/kern_lock.c:173 __mp_acquire_count(ffffffff83b2e680,1) at __mp_acquire_count+0x58 sys/kern/kern_lock.c:-1 malloc(28,29,9) at malloc+0xe3 sys/kern/kern_malloc.c:175 uid_find(ee00) at uid_find+0xab sys/kern/kern_proc.c:136 chgproccnt(ee00,1) at chgproccnt+0x39 sys/kern/kern_proc.c:-1 sys_setreuid(ffff80002a220a78,ffff80003c3e8730,ffff80003c3e8680) at sys_setreuid+0x57b crfree sys/kern/kern_prot.c:971 [inline] sys_setreuid(ffff80002a220a78,ffff80003c3e8730,ffff80003c3e8680) at sys_setreuid+0x57b sys/kern/kern_prot.c:690 syscall(ffff80003c3e8730) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c3e8730) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xa312c3ee7e0, count: -11 ddb{1}>