panic: chgproccnt: procs < 0 Stopped at db_enter+0x25: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND 322619 41331 0 0 0 0 syz-executor *391054 79749 0 0x10 0x4000000 1K syz-executor db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff83354df5) at panic+0x1e5 sys/kern/subr_prf.c:198 chgproccnt(ee00,ffffffff) at chgproccnt+0xcc sys/kern/kern_proc.c:171 sys_setuid(ffff800039803738,ffff80002efdcaf0,ffff80002efdca40) at sys_setuid+0x2eb sys/kern/kern_prot.c:746 syscall(ffff80002efdcaf0) at syscall+0xb08 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80002efdcaf0) at syscall+0xb08 sys/arch/amd64/amd64/trap.c:579 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xad12e8015d0, 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(ffffffff83354df5) at panic+0x1e5 sys/kern/subr_prf.c:198 chgproccnt(ee00,ffffffff) at chgproccnt+0xcc sys/kern/kern_proc.c:171 sys_setuid(ffff800039803738,ffff80002efdcaf0,ffff80002efdca40) at sys_setuid+0x2eb sys/kern/kern_prot.c:746 syscall(ffff80002efdcaf0) at syscall+0xb08 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80002efdcaf0) at syscall+0xb08 sys/arch/amd64/amd64/trap.c:579 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xad12e8015d0, count: -6 ddb{1}> show registers rdi 0 rsi 0x1 rbp 0xffff80002efdc8c0 rbx 0xffff8000299dedd7 rdx 0xffff800001459f40 rcx 0xffff800039803738 rax 0xffff8000299ddff0 r8 0x101010101010101 r9 0x8080808080808080 r10 0x78c9ee274fa564e3 r11 0x67242ac14454add0 r12 0xffff8000299debd8 r13 0 r14 0 r15 0x1 rip 0xffffffff81c1bf75 db_enter+0x25 cs 0x8 rflags 0x246 rsp 0xffff80002efdc8b0 ss 0x10 db_enter+0x25: addq $0x8,%rsp ddb{1}> show proc PROC (syz-executor) tid=391054 pid=79749 tcnt=3 stat=onproc flags process=10 proc=4000000 runpri=59, usrpri=59, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff800039803c58,0xffff8000398039d8 process=0xffff8000343e44d8 user=0xffff80002efd7000, vmspace=0xfffffd806bc95b60 estcpu=9, cpticks=0, pctcpu=0.0, user=0, sys=0, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 71364 379017 62044 0 2 0 syz-executor 71364 95158 62044 0 3 0x4000080 fsleep syz-executor 65797 479630 86431 0 2 0 syz-executor 65797 221334 86431 0 3 0x4000080 fsleep syz-executor 65797 315554 86431 0 2 0x4000000 syz-executor 41331 322619 51079 0 7 0 syz-executor 41331 125182 51079 0 3 0x4000080 fsleep syz-executor 41331 100681 51079 0 2 0x4000000 syz-executor 79749 119177 66376 0 2 0x10 syz-executor *79749 391054 66376 0 7 0x4000010 syz-executor 79749 55296 66376 0 2 0x4000010 syz-executor 28294 518840 62676 0 2 0x11 syz-executor 28294 85416 62676 0 3 0x4000090 fsleep syz-executor 77381 265802 39370 0 3 0x80 nanoslp syz-executor 77381 277375 39370 0 3 0x4000080 kqread syz-executor 86431 447863 7120 0 3 0x82 nanoslp syz-executor 51079 46040 7120 0 3 0x82 nanoslp syz-executor 39370 130481 7120 0 3 0x82 nanoslp syz-executor 62044 304664 7120 0 3 0x82 nanoslp syz-executor 72196 201771 7120 0 3 0x2 biowait syz-executor 62676 6195 7120 0 3 0x82 nanoslp syz-executor 66376 98072 7120 0 3 0x82 nanoslp syz-executor 53746 42856 7120 0 3 0x2 biowait syz-executor 7120 468265 49433 0 3 0x82 kqread syz-executor 49433 173474 68409 0 3 0x10008a sigsusp ksh 68409 117372 38035 0 3 0x98 kqread sshd-session 38035 250000 35617 0 3 0x92 kqread sshd-session 54775 438023 1 0 3 0x100083 ttyin getty 35617 192084 1 0 3 0x88 kqread sshd 5559 486819 74894 74 3 0x1100092 bpf pflogd 74894 471916 1 0 3 0x80 sbwait pflogd 38387 39786 18503 73 3 0x1100090 kqread syslogd 18503 279011 1 0 3 0x100082 sbwait syslogd 9158 469678 1 0 3 0x100080 kqread resolvd 19459 174537 87958 77 3 0x100092 kqread dhcpleased 82243 116683 87958 77 3 0x100092 kqread dhcpleased 87958 38520 1 0 3 0x80 kqread dhcpleased 76552 306343 0 0 3 0x14200 bored smr 60774 169977 0 0 2 0x14200 zerothread 76196 173800 0 0 3 0x14200 aiodoned aiodoned 96473 272442 0 0 3 0x14200 syncer update 69196 363833 0 0 3 0x14200 cleaner cleaner 31572 415265 0 0 3 0x14200 reaper reaper 7164 438820 0 0 3 0x14200 pgdaemon pagedaemon 4653 455848 0 0 3 0x14200 bored viomb 81557 404741 0 0 3 0x40014200 acpi0 acpi0 81900 215870 0 0 3 0x40014200 idle1 59942 423145 0 0 3 0x14200 bored softnet3 65437 209125 0 0 3 0x14200 bored softnet2 43314 312873 0 0 3 0x14200 bored softnet1 76680 202021 0 0 3 0x14200 bored softnet0 18123 290498 0 0 3 0x14200 bored systqmp 85021 341361 0 0 3 0x14200 bored systq 66927 207747 0 0 3 0x14200 tmoslp softclockmp 2120 267074 0 0 3 0x40014200 tmoslp softclock 26774 337505 0 0 3 0x40014200 idle0 1 238398 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks Process 41331 (syz-executor) thread 0xffff800039802cf8 (100681) exclusive rwlock vmmaplk r = 0 (0xfffffd806bc95e40) #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:5227 #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 79749 (syz-executor) thread 0xffff800039803738 (391054) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff838ed148) #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_setuid+0x2eb sys/kern/kern_prot.c:746 #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 72196 (syz-executor) thread 0xffff80002a2a4f78 (201771) exclusive rrwlock inode r = 0 (0xfffffd806c531f80) #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 ufs_ihashget+0x185 sys/ufs/ufs/ufs_ihash.c:98 #7 ffs_vget+0x8c sys/ufs/ffs/ffs_vfsops.c:1201 #8 ufs_lookup+0x19f8 sys/ufs/ufs/ufs_lookup.c:478 #9 VOP_LOOKUP+0x6e sys/kern/vfs_vops.c:85 #10 vfs_lookup+0x8fa sys/kern/vfs_lookup.c:566 #11 namei+0x7aa sys/kern/vfs_lookup.c:250 #12 dounlinkat+0xc1 sys/kern/vfs_syscalls.c:1864 #13 syscall+0xb08 mi_syscall sys/sys/syscall_mi.h:176 [inline] #13 syscall+0xb08 sys/arch/amd64/amd64/trap.c:579 #14 Xsyscall+0x128 exclusive rrwlock inode r = 0 (0xfffffd806c2338b8) #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 vfs_lookup+0x109 sys/kern/vfs_lookup.c:418 #6 namei+0x7aa sys/kern/vfs_lookup.c:250 #7 dounlinkat+0xc1 sys/kern/vfs_syscalls.c:1864 #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 53746 (syz-executor) thread 0xffff80002a2a5208 (42856) exclusive rrwlock inode r = 0 (0xfffffd806c531d40) #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 ufs_ihashget+0x185 sys/ufs/ufs/ufs_ihash.c:98 #7 ffs_vget+0x8c sys/ufs/ffs/ffs_vfsops.c:1201 #8 ufs_lookup+0x19f8 sys/ufs/ufs/ufs_lookup.c:478 #9 VOP_LOOKUP+0x6e sys/kern/vfs_vops.c:85 #10 vfs_lookup+0x8fa sys/kern/vfs_lookup.c:566 #11 namei+0x7aa sys/kern/vfs_lookup.c:250 #12 dounlinkat+0xc1 sys/kern/vfs_syscalls.c:1864 #13 syscall+0xb08 mi_syscall sys/sys/syscall_mi.h:176 [inline] #13 syscall+0xb08 sys/arch/amd64/amd64/trap.c:579 #14 Xsyscall+0x128 exclusive rrwlock inode r = 0 (0xfffffd806c531b00) #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 cache_lookup+0x36e sys/kern/vfs_cache.c:222 #7 ufs_lookup+0x21b sys/ufs/ufs/ufs_lookup.c:160 #8 VOP_LOOKUP+0x6e sys/kern/vfs_vops.c:85 #9 vfs_lookup+0x8fa sys/kern/vfs_lookup.c:566 #10 namei+0x7aa sys/kern/vfs_lookup.c:250 #11 dounlinkat+0xc1 sys/kern/vfs_syscalls.c:1864 #12 syscall+0xb08 mi_syscall sys/sys/syscall_mi.h:176 [inline] #12 syscall+0xb08 sys/arch/amd64/amd64/trap.c:579 #13 Xsyscall+0x128 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10189 11021K 11130K 166960K 11285 0 pcb 18 12K 12K 166960K 23 0 rtable 234 6K 6K 166960K 349 0 pf 34 17K 18K 166960K 47 0 ifaddr 43 7K 7K 166960K 46 0 ifgroup 55 2K 2K 166960K 59 0 sysctl 1 1K 9K 166960K 5 0 counters 66 36K 36K 166960K 68 0 ioctlops 0 0K 4K 166960K 1484 0 iov 0 0K 0K 166960K 2 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1343 84K 85K 166960K 1370 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 4 0K 0K 166960K 5 0 dirhash 12 2K 2K 166960K 12 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 16 57K 85K 166960K 153 0 proc 72 91K 128K 166960K 534 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 2 0 in_multi 99 7K 7K 166960K 99 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 31 148K 148K 166960K 31 0 exec 0 0K 1K 166960K 362 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 225 151K 165K 166960K 3168 0 UVM aobj 5 2K 2K 166960K 5 0 pinsyscall 41 82K 104K 166960K 1236 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 3 0 NDP 28 2K 2K 166960K 29 0 temp 34 8670K 8734K 166960K 4346 0 kqueue 17 24K 26K 166960K 30 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 35 0 31 1 0 1 1 0 8 0 rtentry 176 111 0 1 5 0 5 5 0 8 0 unpcb 144 37 0 20 1 0 1 1 0 8 0 syncache 336 4 0 4 1 1 0 1 0 8 0 tcpqe 32 1 0 1 1 1 0 1 0 8 0 tcpcb 808 15 0 10 1 0 1 1 0 8 0 arp 128 18 0 0 1 0 1 1 0 8 0 inpcb 384 83 0 74 2 0 2 2 0 8 0 nd6 144 24 0 0 1 0 1 1 0 8 0 pkpcb 40 1 0 1 1 0 1 1 0 8 1 kcovpl 48 8 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 17 0 0 1 0 1 1 0 8 0 pfstkey 128 17 0 0 1 0 1 1 0 8 0 pfstate 384 17 0 0 2 0 2 2 0 8 0 pfrule 1344 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 256 452 0 0 29 0 29 29 0 8 0 art_table 32 453 0 0 4 0 4 4 0 8 0 art_node 16 110 0 10 1 0 1 1 0 8 0 semapl 112 2 0 0 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 1584 0 69 95 0 95 95 0 8 0 ffsino 288 1584 0 69 109 0 109 109 0 8 0 nchpl 144 1792 0 107 63 0 63 63 0 8 0 uvmvnodes 80 1678 0 0 35 0 35 35 0 8 0 vnodes 216 1678 0 0 94 0 94 94 0 8 0 namei 1024 5463 0 5463 4 2 2 2 0 8 2 percpumem 16 49 0 1 1 0 1 1 0 8 0 kstatmem 264 28 0 2 2 0 2 2 0 8 0 scxspl 216 5862 0 5860 3 2 1 2 1 8 0 plimitpl 152 28 0 11 1 0 1 1 0 8 0 sigapl 424 452 0 404 7 1 6 7 0 8 0 knotepl 120 65 0 0 2 0 2 2 0 8 0 kqueuepl 224 26 0 14 1 0 1 1 0 8 0 pipepl 336 102 0 75 3 0 3 3 0 8 0 fdescpl 520 434 0 404 3 0 3 3 0 8 0 filepl 160 1505 0 1289 10 0 10 10 0 8 0 lockfpl 104 7 0 4 1 0 1 1 0 8 0 lockfspl 48 5 0 2 1 0 1 1 0 8 0 sessionpl 144 23 0 14 1 0 1 1 0 8 0 pgrppl 48 31 0 14 1 0 1 1 0 8 0 ucredpl 104 77 0 61 1 0 1 1 0 8 0 zombiepl 144 405 0 405 1 0 1 1 0 8 1 processpl 1208 452 0 404 5 0 5 5 0 8 0 procpl 656 493 0 436 6 0 6 6 0 8 0 sockpl 728 158 0 128 4 0 4 4 0 8 0 mcl8k 8192 1 0 0 1 0 1 1 0 8 0 mcl4k 4096 110 0 0 14 0 14 14 0 8 0 mcl2k 2048 26 0 0 4 0 4 4 0 8 0 mtagpl 96 3 0 0 1 0 1 1 0 8 0 mbufpl 256 218 0 0 14 0 14 14 0 8 0 bufpl 280 2315 0 123 157 0 157 157 0 8 0 anonpl 32 4045 0 0 33 0 33 33 0 246 0 amapchunkpl 152 8823 0 8373 20 0 20 20 0 158 0 amappl16 200 2150 0 2132 6 4 2 6 0 8 0 amappl15 192 2 0 2 1 1 0 1 0 8 0 amappl14 184 114 0 101 1 0 1 1 0 8 0 amappl13 176 22 0 21 1 0 1 1 0 8 0 amappl12 168 1076 0 1046 3 1 2 2 0 8 0 amappl11 160 54 0 40 1 0 1 1 0 8 0 amappl10 152 11 0 11 1 1 0 1 0 8 0 amappl9 144 246 0 246 1 1 0 1 0 8 0 amappl8 136 20 0 18 1 0 1 1 0 8 0 amappl7 128 122 0 110 1 0 1 1 0 8 0 amappl6 120 179 0 176 1 0 1 1 0 8 0 amappl5 112 122 0 113 1 0 1 1 0 8 0 amappl4 104 324 0 305 1 0 1 1 0 8 0 amappl3 96 1348 0 1246 3 0 3 3 0 8 0 amappl2 88 628 0 568 2 0 2 2 0 8 0 amappl1 80 8322 0 7724 16 1 15 16 0 8 1 amappl 88 2489 0 2335 4 0 4 4 0 92 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 24 434 0 404 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 434 0 404 1 0 1 1 0 8 0 vmmpekpl 168 5401 0 5363 2 0 2 2 0 8 0 vmmpepl 168 35030 0 33140 96 8 88 95 0 357 0 vmsppl 480 433 0 404 5 0 5 5 0 8 0 rwobjpl 72 14544 0 11964 50 0 50 50 0 8 0 pdppl 4096 876 0 808 94 22 72 82 0 8 4 pvpl 32 10451 0 0 85 0 85 85 0 265 0 pmappl 256 433 0 404 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 379 0 27 11 0 11 11 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp x86_ipi_db(ffffffff83876ff0) 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(ffffffff838ecf40) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:113 [inline] __mp_lock(ffffffff838ecf40) at __mp_lock+0x192 sys/kern/kern_lock.c:144 intr_handler(ffff800034ffa990,ffff800000079f00) at intr_handler+0xe1 sys/arch/amd64/amd64/intr.c:559 Xintr_ioapic_edge23_untramp() at Xintr_ioapic_edge23_untramp+0x18f end of kernel end trace frame: 0x747bf0ff5fb0, count: 9 ddb{0}> trace x86_ipi_db(ffffffff83876ff0) 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(ffffffff838ecf40) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:113 [inline] __mp_lock(ffffffff838ecf40) at __mp_lock+0x192 sys/kern/kern_lock.c:144 intr_handler(ffff800034ffa990,ffff800000079f00) at intr_handler+0xe1 sys/arch/amd64/amd64/intr.c:559 Xintr_ioapic_edge23_untramp() at Xintr_ioapic_edge23_untramp+0x18f end of kernel end trace frame: 0x747bf0ff5fb0, 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(ffffffff83354df5) at panic+0x1e5 sys/kern/subr_prf.c:198 chgproccnt(ee00,ffffffff) at chgproccnt+0xcc sys/kern/kern_proc.c:171 sys_setuid(ffff800039803738,ffff80002efdcaf0,ffff80002efdca40) at sys_setuid+0x2eb sys/kern/kern_prot.c:746 syscall(ffff80002efdcaf0) at syscall+0xb08 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80002efdcaf0) at syscall+0xb08 sys/arch/amd64/amd64/trap.c:579 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xad12e8015d0, count: 9 ddb{1}> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff83354df5) at panic+0x1e5 sys/kern/subr_prf.c:198 chgproccnt(ee00,ffffffff) at chgproccnt+0xcc sys/kern/kern_proc.c:171 sys_setuid(ffff800039803738,ffff80002efdcaf0,ffff80002efdca40) at sys_setuid+0x2eb sys/kern/kern_prot.c:746 syscall(ffff80002efdcaf0) at syscall+0xb08 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80002efdcaf0) at syscall+0xb08 sys/arch/amd64/amd64/trap.c:579 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xad12e8015d0, count: -6