¹j¼õ¬|ÿ ž¨E1\…:panic: chgproccnt: procs < 0 Stopped at db_enter+0x25: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND 120211 67546 0 0 0 0 syz-executor * 83315 52674 60929 0x10 0x4000000 1K syz-executor db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff834d79b7) at panic+0x1e5 sys/kern/subr_prf.c:198 chgproccnt(ee00,ffffffff) at chgproccnt+0xcc sys_setresuid(ffff8000fffee018,ffff80003c4317e0,ffff80003c431730) at sys_setresuid+0x577 sys/kern/kern_prot.c:421 syscall(ffff80003c4317e0) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c4317e0) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x6b89b3c6da0, 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(ffffffff834d79b7) at panic+0x1e5 sys/kern/subr_prf.c:198 chgproccnt(ee00,ffffffff) at chgproccnt+0xcc sys_setresuid(ffff8000fffee018,ffff80003c4317e0,ffff80003c431730) at sys_setresuid+0x577 sys/kern/kern_prot.c:421 syscall(ffff80003c4317e0) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c4317e0) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x6b89b3c6da0, count: -6 ddb{1}> show registers rdi 0 rsi 0x1 rbp 0xffff80003c4315a0 rbx 0xffff8000299bee07 rdx 0 rcx 0xffff8000fffee018 rax 0xffff8000299bdff0 r8 0x101010101010101 r9 0x8080808080808080 r10 0xa1d4ce5401b24f3b r11 0x1aab58a7553691b4 r12 0xffff8000299bec08 r13 0 r14 0 r15 0x1 rip 0xffffffff825dcfa5 db_enter+0x25 cs 0x8 rflags 0x246 rsp 0xffff80003c431590 ss 0x10 db_enter+0x25: addq $0x8,%rsp ddb{1}> show proc PROC (syz-executor) tid=83315 pid=52674 tcnt=4 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=0xffff8000fffeed10,0xffff80003c3dc7f8 process=0xffff80003c3e04f0 user=0xffff80003c42c000, vmspace=0xfffffd806c7109a0 estcpu=0, cpticks=1, pctcpu=0.0, user=0, sys=1, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 67546 120211 30823 0 7 0 syz-executor 67546 283002 30823 0 3 0x4000080 fsleep syz-executor 67546 523808 30823 0 2 0x4000000 syz-executor 7173 292927 52569 0 2 0x2 ifconfig 52674 58705 92127 60929 2 0x10 syz-executor 52674 453366 92127 60929 2 0x4000010 syz-executor *52674 83315 92127 60929 7 0x4000010 syz-executor 52674 386233 92127 60929 3 0x4000090 fsleep syz-executor 68004 503390 32633 0 2 0 syz-executor 68004 417558 32633 0 3 0x4000080 fsleep syz-executor 68004 199236 32633 0 3 0x4000080 fsleep syz-executor 57671 206338 63155 0 2 0 syz-executor 57671 144432 63155 0 3 0x4000080 fsleep syz-executor 52569 220453 60523 0 3 0x10008a sigsusp sh 92491 255604 95425 0 2 0 syz-executor 92491 170889 95425 0 3 0x4000080 fsleep syz-executor 92491 91468 95425 0 3 0x4000080 fsleep syz-executor 21421 91059 79452 0 2 0 syz-executor 21421 189656 79452 0 3 0x4000080 fsleep syz-executor 21421 505437 79452 0 3 0x4000080 fsleep syz-executor 63155 461310 72658 0 3 0x82 nanoslp syz-executor 21702 452689 72658 0 3 0x2 biowait syz-executor 32633 213788 72658 0 3 0x82 nanoslp syz-executor 95425 515165 72658 0 2 0x3 syz-executor 60523 435119 72658 0 3 0x82 wait syz-executor 30823 292703 72658 0 2 0x3 syz-executor 92127 331363 72658 0 2 0x3 syz-executor 79452 138091 72658 0 3 0x82 nanoslp syz-executor 72658 287333 90232 0 3 0x82 kqread syz-executor 90232 309015 26232 0 3 0x10008a sigsusp ksh 26232 319886 34072 0 3 0x98 kqread sshd-session 34072 335414 23608 0 3 0x92 kqread sshd-session 70558 431976 1 0 3 0x100083 ttyopn getty 23608 273173 1 0 3 0x88 kqread sshd 93497 77999 68296 74 3 0x1100092 bpf pflogd 68296 21950 1 0 3 0x80 sbwait pflogd 17802 248929 59559 73 3 0x1100090 kqread syslogd 59559 326777 1 0 3 0x100082 sbwait syslogd 93780 211429 1 0 3 0x100080 kqread resolvd 71048 96334 34504 77 3 0x100092 kqread dhcpleased 75618 467066 34504 77 3 0x100092 kqread dhcpleased 34504 509424 1 0 3 0x80 kqread dhcpleased 3984 43901 0 0 3 0x14200 bored smr 34653 111227 0 0 2 0x14200 zerothread 68599 172581 0 0 3 0x14200 aiodoned aiodoned 74843 139418 0 0 3 0x14200 syncer update 62360 322619 0 0 3 0x14200 cleaner cleaner 83201 484250 0 0 3 0x14200 reaper reaper 82999 239579 0 0 3 0x14200 pgdaemon pagedaemon 63960 77766 0 0 3 0x14200 bored viomb 31070 180346 0 0 3 0x40014200 acpi0 acpi0 21419 62908 0 0 3 0x40014200 idle1 30411 467503 0 0 3 0x14200 bored softnet1 8169 431988 0 0 3 0x14200 bored softnet0 87221 238932 0 0 3 0x14200 bored systqmp 11045 1500 0 0 3 0x14200 bored systq 14888 347192 0 0 3 0x14200 tmoslp softclockmp 83520 287799 0 0 3 0x40014200 tmoslp softclock 28560 295504 0 0 3 0x40014200 idle0 1 114789 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks Process 52674 (syz-executor) thread 0xffff8000fffee018 (83315) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff839913c0) #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 Process 21702 (syz-executor) thread 0xffff8000fffef4d8 (452689) exclusive rrwlock inode r = 0 (0xfffffd806c475318) #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_write+0x419 sys/kern/kern_rwlock.c:320 #2 rrw_enter+0xc6 sys/kern/kern_rwlock.c:621 #3 VOP_LOCK+0xbd sys/kern/vfs_vops.c:527 #4 ufs_ihashins+0x4f ufs_ihash sys/ufs/ufs/ufs_ihash.c:-1 [inline] #4 ufs_ihashins+0x4f sys/ufs/ufs/ufs_ihash.c:159 #5 ffs_vget+0x187 sys/ufs/ffs/ffs_vfsops.c:1232 #6 ffs_inode_alloc+0x279 sys/ufs/ffs/ffs_alloc.c:393 #7 ufs_mkdir+0xfc sys/ufs/ufs/ufs_vnops.c:1112 #8 VOP_MKDIR+0x101 sys/kern/vfs_vops.c:394 #9 domkdirat+0x179 sys/kern/vfs_syscalls.c:3143 #10 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] #10 syscall+0xb17 sys/arch/amd64/amd64/trap.c:783 #11 Xsyscall+0x128 exclusive rrwlock inode r = 0 (0xfffffd806cd43680) #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_write+0x419 sys/kern/kern_rwlock.c:320 #2 rrw_enter+0xc6 sys/kern/kern_rwlock.c:621 #3 VOP_LOCK+0xbd sys/kern/vfs_vops.c:527 #4 vn_lock+0xa4 sys/kern/vfs_vnops.c:576 #5 vfs_lookup+0x11c sys/kern/vfs_lookup.c:-1 #6 namei+0x7ca sys/kern/vfs_lookup.c:250 #7 domkdirat+0x8b sys/kern/vfs_syscalls.c:3128 #8 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] #8 syscall+0xb17 sys/arch/amd64/amd64/trap.c:783 #9 Xsyscall+0x128 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 11057 12101K 12242K 166960K 12174 0 pcb 17 12K 12K 166960K 21 0 rtable 223 6K 6K 166960K 336 0 pf 34 17K 18K 166960K 45 0 ifaddr 41 7K 7K 166960K 43 0 ifgroup 55 2K 2K 166960K 55 0 sysctl 3 1K 9K 166960K 7 0 counters 70 37K 37K 166960K 70 0 ioctlops 0 0K 4K 166960K 1486 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1295 81K 82K 166960K 1379 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 1K 166960K 2 0 VM map 2 1K 1K 166960K 2 0 sem 2 0K 0K 166960K 2 0 dirhash 12 2K 2K 166960K 12 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 18 65K 93K 166960K 155 0 sigio 0 0K 0K 166960K 1 0 proc 71 115K 164K 166960K 553 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 5 0 in_multi 89 6K 6K 166960K 89 0 ether_multi 1 0K 0K 166960K 1 0 mrt 0 0K 0K 166960K 5 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 37 175K 175K 166960K 37 0 exec 0 0K 1K 166960K 380 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 240 168K 179K 166960K 3415 0 UVM aobj 4 2K 2K 166960K 4 0 pinsyscall 43 86K 107K 166960K 1287 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 1 0K 0K 166960K 3 0 NDP 12 0K 1K 166960K 26 0 temp 37 9074K 9142K 166960K 5862 0 kqueue 13 20K 22K 166960K 25 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 33 0 30 1 0 1 1 0 8 0 rtentry 176 105 0 2 5 0 5 5 0 8 0 unpcb 144 43 0 26 1 0 1 1 0 8 0 syncache 336 3 0 3 1 1 0 1 0 8 0 tcpcb 736 10 0 5 1 0 1 1 0 8 0 arp 136 18 0 0 1 0 1 1 0 8 0 inpcb 328 81 0 72 2 0 2 2 0 8 1 nd6 152 21 0 0 1 0 1 1 0 8 0 kcovpl 48 8 0 0 1 0 1 1 0 8 0 pffrag 232 1 0 0 1 0 1 1 0 482 0 pffrnode 88 1 0 0 1 0 1 1 0 8 0 pffrent 40 1 0 0 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 pfstitem 24 19 0 0 1 0 1 1 0 8 0 pfstkey 128 19 0 0 1 0 1 1 0 8 0 pfstate 448 19 0 0 3 0 3 3 0 8 0 pfrule 1360 21 0 16 2 1 1 2 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 413 0 0 26 0 26 26 0 8 0 art_table 40 414 0 0 5 0 5 5 0 8 0 art_node 32 104 0 10 1 0 1 1 0 8 0 sysvmsgpl 40 3 0 0 1 0 1 1 0 8 0 shmpl 112 1 0 0 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 1600 0 133 92 0 92 92 0 8 0 ffsino 296 1600 0 133 114 0 114 114 0 8 0 nchpl 144 1826 0 132 64 0 64 64 0 8 0 vnodes 216 1701 0 0 95 0 95 95 0 8 0 namei 1024 5500 0 5499 4 3 1 2 0 8 0 percpumem 16 50 0 0 1 0 1 1 0 8 0 kstatmem 264 26 0 0 2 0 2 2 0 8 0 scxspl 216 6163 0 6162 3 2 1 2 1 8 0 plimitpl 152 29 0 12 1 0 1 1 0 8 0 sigapl 424 467 0 419 7 0 7 7 0 8 1 knotepl 120 55 0 0 2 0 2 2 0 8 0 kqueuepl 224 24 0 15 1 0 1 1 0 8 0 pipepl 344 126 0 99 3 0 3 3 0 8 0 fdescpl 528 451 0 419 3 0 3 3 0 8 0 filepl 160 1623 0 1409 11 1 10 10 0 8 0 lockfpl 104 12 0 10 1 0 1 1 0 8 0 lockfspl 48 7 0 5 1 0 1 1 0 8 0 sessionpl 144 24 0 14 1 0 1 1 0 8 0 pgrppl 48 32 0 14 1 0 1 1 0 8 0 ucredpl 104 89 0 72 1 0 1 1 0 8 0 zombiepl 144 434 0 434 2 1 1 1 0 8 1 processpl 1232 467 0 419 5 0 5 5 0 8 0 procpl 664 521 0 461 6 0 6 6 0 8 0 sockpl 752 160 0 131 5 1 4 4 0 8 1 mcl8k 8192 2 0 0 1 0 1 1 0 8 0 mcl4k 4096 111 0 0 14 0 14 14 0 8 0 mcl2k 2048 31 0 0 4 0 4 4 0 8 0 mtagpl 96 2 0 0 1 0 1 1 0 8 0 mbufpl 256 175 0 0 11 0 11 11 0 8 0 bufpl 280 2326 0 105 159 0 159 159 0 8 0 anonpl 32 5569 0 0 45 0 45 45 0 246 0 amapchunkpl 152 9471 0 8984 26 0 26 26 0 158 6 amappl16 200 1940 0 1920 6 4 2 5 0 8 0 amappl15 192 21 0 21 1 1 0 1 0 8 0 amappl14 184 427 0 425 1 0 1 1 0 8 0 amappl13 176 119 0 107 1 0 1 1 0 8 0 amappl12 168 699 0 669 2 0 2 2 0 8 0 amappl11 160 12 0 12 1 1 0 1 0 8 0 amappl10 152 137 0 123 1 0 1 1 0 8 0 amappl9 144 267 0 267 1 1 0 1 0 8 0 amappl8 136 101 0 98 1 0 1 1 0 8 0 amappl7 128 145 0 132 1 0 1 1 0 8 0 amappl6 120 194 0 191 1 0 1 1 0 8 0 amappl5 112 109 0 99 1 0 1 1 0 8 0 amappl4 104 282 0 263 1 0 1 1 0 8 0 amappl3 96 1617 0 1505 4 0 4 4 0 8 1 amappl2 88 513 0 453 2 0 2 2 0 8 0 amappl1 80 9289 0 8679 15 0 15 15 0 8 1 amappl 88 2700 0 2534 5 0 5 5 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 128 253 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 3 0 0 1 0 1 1 0 8 0 uaddrrnd 24 451 0 419 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 451 0 419 1 0 1 1 0 8 0 vmmpekpl 168 5510 0 5474 2 0 2 2 0 8 0 vmmpepl 168 37242 0 35350 89 1 88 88 0 357 3 vmsppl 488 450 0 419 5 0 5 5 0 8 1 rwobjpl 80 13903 0 12865 24 1 23 24 0 8 0 pdppl 4096 909 0 838 101 28 73 87 0 8 2 pvpl 32 12819 0 0 105 1 104 104 0 265 0 pmappl 256 450 0 419 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 270 0 35 8 0 8 8 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp x86_ipi_db(ffffffff83889ff0) 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(ffffffff83990bc0) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:142 [inline] __mp_lock(ffffffff83990bc0) at __mp_lock+0x192 sys/kern/kern_lock.c:173 intr_handler(ffff80003c3cdc30,ffff8000002a3480) at intr_handler+0xe9 sys/arch/amd64/amd64/intr.c:560 Xintr_ioapic_edge23_untramp() at Xintr_ioapic_edge23_untramp+0x18f end of kernel end trace frame: 0x77552dc4a0e0, count: 9 ddb{0}> trace x86_ipi_db(ffffffff83889ff0) 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(ffffffff83990bc0) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:142 [inline] __mp_lock(ffffffff83990bc0) at __mp_lock+0x192 sys/kern/kern_lock.c:173 intr_handler(ffff80003c3cdc30,ffff8000002a3480) at intr_handler+0xe9 sys/arch/amd64/amd64/intr.c:560 Xintr_ioapic_edge23_untramp() at Xintr_ioapic_edge23_untramp+0x18f end of kernel end trace frame: 0x77552dc4a0e0, count: -6 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(ffffffff834d79b7) at panic+0x1e5 sys/kern/subr_prf.c:198 chgproccnt(ee00,ffffffff) at chgproccnt+0xcc sys_setresuid(ffff8000fffee018,ffff80003c4317e0,ffff80003c431730) at sys_setresuid+0x577 sys/kern/kern_prot.c:421 syscall(ffff80003c4317e0) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c4317e0) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x6b89b3c6da0, count: 9 ddb{1}> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff834d79b7) at panic+0x1e5 sys/kern/subr_prf.c:198 chgproccnt(ee00,ffffffff) at chgproccnt+0xcc sys_setresuid(ffff8000fffee018,ffff80003c4317e0,ffff80003c431730) at sys_setresuid+0x577 sys/kern/kern_prot.c:421 syscall(ffff80003c4317e0) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c4317e0) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x6b89b3c6da0, count: -6