panic: kernel diagnostic assertion "refs != ~0" failed: file "/syzkaller/managers/multicore/kernel/sys/kern/kern_synch.c", line 944 Stopped at db_enter+0x25: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND *111148 93665 0 0 0x4000000 0K syz-executor db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:437 panic(ffffffff8343b582) at panic+0x1e5 sys/kern/subr_prf.c:198 __assert(ffffffff833e7d34,ffffffff833f04dc,3b0,ffffffff833f0524) at __assert+0x29 refcnt_finalize(ffff80003c527988,ffffffff8332fc97) at refcnt_finalize+0x1c8 sys/kern/kern_synch.c:945 pppx_if_destroy(ffff80002a4a1000,ffff80003c527980) at pppx_if_destroy+0x3d sys/net/if_pppx.c:806 pppxclose(205b9a,1,2000,ffff8000398c07c0) at pppxclose+0xa0 sys/net/if_pppx.c:553 spec_close(ffff80003c4e6a80) at spec_close+0x412 VOP_CLOSE(fffffd806bd84e90,1,fffffd807f7d3680,ffff8000398c07c0) at VOP_CLOSE+0x133 sys/kern/vfs_vops.c:156 vn_closefile(fffffd806bc13bf0,ffff8000398c07c0) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd806bc13bf0,ffff8000398c07c0) at vn_closefile+0x12b sys/kern/vfs_vnops.c:615 fdrop(fffffd806bc13bf0,ffff8000398c07c0) at fdrop+0x126 sys/kern/kern_descrip.c:1265 closef(fffffd806bc13bf0,ffff8000398c07c0) at closef+0x192 sys/kern/kern_descrip.c:1249 finishdup(ffff8000398c07c0,fffffd806bc13db8,3,4,ffff80003c4e6cf0,2) at finishdup+0x444 sys/kern/kern_descrip.c:677 syscall(ffff80003c4e6da0) at syscall+0xbc6 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c4e6da0) at syscall+0xbc6 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xd81376f100, count: 1 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: kernel diagnostic assertion "refs != ~0" failed: file "/syzkaller/managers/multicore/kernel/sys/kern/kern_synch.c", line 944 ddb{0}> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:437 panic(ffffffff8343b582) at panic+0x1e5 sys/kern/subr_prf.c:198 __assert(ffffffff833e7d34,ffffffff833f04dc,3b0,ffffffff833f0524) at __assert+0x29 refcnt_finalize(ffff80003c527988,ffffffff8332fc97) at refcnt_finalize+0x1c8 sys/kern/kern_synch.c:945 pppx_if_destroy(ffff80002a4a1000,ffff80003c527980) at pppx_if_destroy+0x3d sys/net/if_pppx.c:806 pppxclose(205b9a,1,2000,ffff8000398c07c0) at pppxclose+0xa0 sys/net/if_pppx.c:553 spec_close(ffff80003c4e6a80) at spec_close+0x412 VOP_CLOSE(fffffd806bd84e90,1,fffffd807f7d3680,ffff8000398c07c0) at VOP_CLOSE+0x133 sys/kern/vfs_vops.c:156 vn_closefile(fffffd806bc13bf0,ffff8000398c07c0) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd806bc13bf0,ffff8000398c07c0) at vn_closefile+0x12b sys/kern/vfs_vnops.c:615 fdrop(fffffd806bc13bf0,ffff8000398c07c0) at fdrop+0x126 sys/kern/kern_descrip.c:1265 closef(fffffd806bc13bf0,ffff8000398c07c0) at closef+0x192 sys/kern/kern_descrip.c:1249 finishdup(ffff8000398c07c0,fffffd806bc13db8,3,4,ffff80003c4e6cf0,2) at finishdup+0x444 sys/kern/kern_descrip.c:677 syscall(ffff80003c4e6da0) at syscall+0xbc6 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c4e6da0) at syscall+0xbc6 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xd81376f100, count: -14 ddb{0}> show registers rdi 0 rsi 0x1 rbp 0xffff80003c4e6850 rbx 0xffffffff83884dc7 cpu_info_full_primary+0x2dc7 rdx 0xffff800001441880 rcx 0xffff8000398c07c0 rax 0xffffffff83883ff0 cpu_info_full_primary+0x1ff0 r8 0 r9 0x8080808080808080 r10 0x59515297c31041fb r11 0xf0022ff27e1a0fbe r12 0xffffffff83884bc8 cpu_info_full_primary+0x2bc8 r13 0 r14 0 r15 0x1 rip 0xffffffff811241e5 db_enter+0x25 cs 0x8 rflags 0x246 rsp 0xffff80003c4e6840 ss 0x10 db_enter+0x25: addq $0x8,%rsp ddb{0}> show proc PROC (syz-executor) tid=111148 pid=93665 tcnt=2 stat=onproc flags process=0 proc=4000000 runpri=32, usrpri=86, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff8000398c0538,0xffff8000398c1478 process=0xffff8000314a7938 user=0xffff80003c4e1000, vmspace=0xfffffd806eb521d0 estcpu=36, cpticks=2, pctcpu=0.0, user=0, sys=2, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 35695 436244 64706 0 2 0 syz-executor 35695 53954 64706 0 3 0x4000080 fsleep syz-executor 7243 391024 11008 0 2 0x480 syz-executor 7243 289476 11008 0 3 0x4000000 smrbar syz-executor 93665 352313 31373 0 2 0 syz-executor *93665 111148 31373 0 7 0x4000000 syz-executor 30900 71181 63372 0 2 0 syz-executor 30900 480787 63372 0 3 0x4000080 fsleep syz-executor 19744 445207 43395 -1 2 0x10 syz-executor 19744 149957 43395 -1 3 0x4000090 fsleep syz-executor 47864 297346 46166 0 2 0 syz-executor 47864 244110 46166 0 3 0x4000080 fsleep syz-executor 21706 274511 2585 0 3 0x80 nanoslp syz-executor 21706 322674 2585 0 3 0x4000080 fsleep syz-executor 21706 451417 2585 0 3 0x4000080 fsleep syz-executor 85600 267230 0 0 3 0x14200 acct acct 28428 223080 0 0 3 0x14200 bored sosplice 43395 153285 38888 0 3 0x82 nanoslp syz-executor 2585 492486 38888 0 3 0x82 nanoslp syz-executor 46166 278270 38888 0 3 0x82 nanoslp syz-executor 1996 84425 38888 0 2 0x2 syz-executor 11008 189145 38888 0 3 0x82 nanoslp syz-executor 63372 226857 38888 0 3 0x82 nanoslp syz-executor 64706 16362 38888 0 2 0x482 syz-executor 31373 499512 38888 0 2 0x482 syz-executor 38888 35759 53888 0 3 0x82 kqread syz-executor 53888 205806 66154 0 3 0x10008a sigsusp ksh 66154 393194 16810 0 3 0x98 kqread sshd-session 16810 227483 45099 0 3 0x92 kqread sshd-session 16036 318137 1 0 3 0x100083 ttyin getty 45099 318839 1 0 3 0x88 kqread sshd 73112 499869 93482 74 3 0x1100092 bpf pflogd 93482 424419 1 0 3 0x80 sbwait pflogd 3710 331812 20349 73 3 0x1100090 kqread syslogd 20349 282562 1 0 3 0x100082 sbwait syslogd 19752 54906 1 0 3 0x100080 kqread resolvd 34971 150489 59720 77 3 0x100092 kqread dhcpleased 90506 224466 59720 77 3 0x100092 kqread dhcpleased 59720 48316 1 0 3 0x80 kqread dhcpleased 82332 262335 0 0 3 0x14200 bored smr 76915 151300 0 0 2 0x14200 zerothread 11994 33700 0 0 3 0x14200 aiodoned aiodoned 59345 83558 0 0 3 0x14200 syncer update 604 137657 0 0 3 0x14200 cleaner cleaner 72891 175341 0 0 3 0x14200 reaper reaper 71291 496858 0 0 3 0x14200 pgdaemon pagedaemon 34943 156740 0 0 3 0x14200 bored viomb 48284 190073 0 0 3 0x40014200 acpi0 acpi0 6809 15139 0 0 7 0x40014200 idle1 7352 326543 0 0 3 0x14200 bored softnet3 62942 334418 0 0 3 0x14200 bored softnet2 97576 155490 0 0 3 0x14200 bored softnet1 24276 435689 0 0 3 0x14200 bored softnet0 79827 163472 0 0 3 0x14200 bored systqmp 68511 317273 0 0 3 0x14200 bored systq 94914 201024 0 0 3 0x14200 tmoslp softclockmp 893 159995 0 0 3 0x40014200 tmoslp softclock 56265 293196 0 0 3 0x40014200 idle0 1 24728 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks Process 93665 (syz-executor) thread 0xffff8000398c07c0 (111148) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff838ffb08) #0 witness_lock+0x5bb stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5bb sys/kern/subr_witness.c:1155 #1 vn_closefile+0x41 sys/kern/vfs_vnops.c:608 #2 fdrop+0x126 sys/kern/kern_descrip.c:1265 #3 closef+0x192 sys/kern/kern_descrip.c:1249 #4 finishdup+0x444 sys/kern/kern_descrip.c:677 #5 syscall+0xbc6 mi_syscall sys/sys/syscall_mi.h:176 [inline] #5 syscall+0xbc6 sys/arch/amd64/amd64/trap.c:577 #6 Xsyscall+0x128 Process 1996 (syz-executor) thread 0xffff80002a38bbf0 (84425) exclusive rrwlock inode r = 0 (0xfffffd805fb7bdc0) #0 witness_lock+0x5bb stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5bb sys/kern/subr_witness.c:1155 #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:524 #4 vn_lock+0xa4 sys/kern/vfs_vnops.c:570 #5 vget+0x2bd sys/kern/vfs_subr.c:694 #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:1851 #13 syscall+0xb08 mi_syscall sys/sys/syscall_mi.h:176 [inline] #13 syscall+0xb08 sys/arch/amd64/amd64/trap.c:577 #14 Xsyscall+0x128 exclusive rrwlock inode r = 0 (0xfffffd806c784650) #0 witness_lock+0x5bb stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5bb sys/kern/subr_witness.c:1155 #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:524 #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:1851 #8 syscall+0xb08 mi_syscall sys/sys/syscall_mi.h:176 [inline] #8 syscall+0xb08 sys/arch/amd64/amd64/trap.c:577 #9 Xsyscall+0x128 ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10204 11096K 11308K 166960K 11678 0 pcb 19 13K 14K 166960K 89 0 rtable 217 7K 7K 166960K 400 0 pf 36 18K 19K 166960K 58 0 ifaddr 41 7K 7K 166960K 51 0 ifgroup 56 2K 2K 166960K 60 0 sysctl 3 1K 1K 166960K 3 0 counters 66 36K 36K 166960K 68 0 ioctlops 0 0K 4K 166960K 1508 0 iov 0 0K 16K 166960K 13 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1442 91K 91K 166960K 1674 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 5K 166960K 8 0 VM map 2 1K 1K 166960K 2 0 sem 9 0K 0K 166960K 11 0 dirhash 12 2K 2K 166960K 15 0 ACPI 1690 195K 286K 166960K 12468 0 file desc 17 61K 93K 166960K 330 0 sigio 0 0K 0K 166960K 5 0 proc 75 103K 128K 166960K 548 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 30 0 in_multi 89 6K 7K 166960K 123 0 ether_multi 1 0K 0K 166960K 2 0 mrt 0 0K 0K 166960K 2 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 384 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 224 72K 77K 166960K 4637 0 UVM aobj 7 2K 2K 166960K 8 0 pinsyscall 42 84K 108K 166960K 1413 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 13 0 NDP 12 0K 1K 166960K 33 0 temp 41 8635K 8699K 166960K 7229 0 kqueue 16 26K 26K 166960K 62 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 24 0 0 1 0 1 1 0 8 0 rtpcb 120 47 0 42 1 0 1 1 0 8 0 rtentry 112 125 0 26 4 0 4 4 0 8 0 unpcb 144 600 0 582 6 0 6 6 0 8 4 syncache 336 4 0 4 1 0 1 1 0 8 1 tcpqe 32 1 0 1 1 0 1 1 0 8 1 tcpcb 808 62 0 57 1 0 1 1 0 8 0 arp 120 18 0 2 1 0 1 1 0 8 0 inpcb 376 291 0 281 5 0 5 5 0 8 3 nd6 136 29 0 9 1 0 1 1 0 8 0 kcovpl 48 8 0 0 1 0 1 1 0 8 0 ppxss 1168 1 0 0 1 0 1 1 0 8 0 pppxif 1472 1 0 0 1 0 1 1 0 8 0 pffrag 232 2 0 0 1 0 1 1 0 482 0 pffrnode 88 2 0 0 1 0 1 1 0 8 0 pffrent 40 3 0 1 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 pftag 88 1 0 0 1 0 1 1 0 8 0 pfstitem 24 35 0 0 1 0 1 1 0 8 0 pfstkey 128 36 0 1 2 0 2 2 0 8 0 pfstate 376 36 0 1 4 0 4 4 0 8 0 pfrule 1344 24 0 19 2 1 1 2 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 539 0 141 30 0 30 30 0 8 2 art_table 32 540 0 141 4 0 4 4 0 8 0 art_node 16 124 0 34 1 0 1 1 0 8 0 semupl 112 1 0 1 1 0 1 1 0 8 1 semapl 112 8 0 1 1 0 1 1 0 8 0 shmpl 112 5 0 1 1 0 1 1 0 8 0 dirhash 1024 19 0 2 3 0 3 3 0 8 0 dino2pl 256 1917 0 409 95 0 95 95 0 8 0 ffsino 280 1917 0 409 109 0 109 109 0 8 0 nchpl 144 2398 0 708 63 0 63 63 0 8 0 uvmvnodes 80 2262 0 0 47 0 47 47 0 8 0 vnodes 216 2262 0 0 126 0 126 126 0 8 0 namei 1024 8440 0 8440 2 1 1 2 0 8 1 percpumem 16 48 0 1 1 0 1 1 0 8 0 kstatmem 264 26 0 2 2 0 2 2 0 8 0 scxspl 216 7572 0 7572 3 2 1 2 1 8 1 plimitpl 152 92 0 74 1 0 1 1 0 8 0 sigapl 424 631 0 580 7 0 7 7 0 8 1 futexpl 64 3433 0 3427 1 0 1 1 0 8 0 knotepl 120 324 0 0 10 0 10 10 0 8 0 kqueuepl 216 79 0 65 1 0 1 1 0 8 0 pipepl 328 121 0 94 3 0 3 3 0 8 0 fdescpl 504 611 0 580 5 0 5 5 0 8 0 filepl 152 3455 0 3231 20 1 19 20 0 8 8 lockfpl 104 131 0 127 1 0 1 1 0 8 0 lockfspl 48 31 0 28 1 0 1 1 0 8 0 sessionpl 144 23 0 14 1 0 1 1 0 8 0 pgrppl 48 38 0 21 1 0 1 1 0 8 0 ucredpl 104 294 0 280 1 0 1 1 0 8 0 zombiepl 144 580 0 580 1 0 1 1 0 8 1 processpl 1168 631 0 580 5 0 5 5 0 8 1 procpl 648 927 0 868 6 0 6 6 0 8 0 srpgc 96 4 0 4 1 0 1 1 0 8 1 sosppl 168 3 0 3 1 0 1 1 0 8 1 sockpl 688 942 0 909 16 5 11 16 0 8 7 mcl16k 16384 1 0 0 1 0 1 1 0 8 0 mcl8k 8192 3 0 0 1 0 1 1 0 8 0 mcl4k 4096 121 0 0 16 0 16 16 0 8 0 mcl2k 2048 18 0 0 3 0 3 3 0 8 0 mtagpl 96 15 0 0 1 0 1 1 0 8 0 mbufpl 256 188 0 0 12 0 12 12 0 8 0 bufpl 280 3710 0 135 256 0 256 256 0 8 0 anonpl 24 116702 0 113238 46 1 45 45 0 184 19 amapchunkpl 152 14173 0 13683 24 0 24 24 0 158 3 amappl16 200 2387 0 2356 15 4 11 14 0 8 8 amappl15 192 12 0 12 1 1 0 1 0 8 0 amappl14 184 115 0 103 1 0 1 1 0 8 0 amappl13 176 26 0 25 1 0 1 1 0 8 0 amappl12 168 1251 0 1220 3 1 2 2 0 8 0 amappl11 160 50 0 35 1 0 1 1 0 8 0 amappl10 152 42 0 42 1 1 0 1 0 8 0 amappl9 144 272 0 272 1 1 0 1 0 8 0 amappl8 136 22 0 19 1 0 1 1 0 8 0 amappl7 128 109 0 97 1 0 1 1 0 8 0 amappl6 120 200 0 197 1 0 1 1 0 8 0 amappl5 112 134 0 123 1 0 1 1 0 8 0 amappl4 104 328 0 309 1 0 1 1 0 8 0 amappl3 96 2540 0 2426 4 0 4 4 0 8 0 amappl2 88 661 0 598 2 0 2 2 0 8 0 amappl1 80 8514 0 7941 15 0 15 15 0 8 2 amappl 88 4242 0 4075 5 0 5 5 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 7 0 1 1 0 1 1 0 8 0 uaddrrnd 24 611 0 580 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 611 0 580 1 0 1 1 0 8 0 vmmpekpl 168 6633 0 6598 2 0 2 2 0 8 0 vmmpepl 168 44503 0 42640 91 0 91 91 0 357 6 vmsppl 456 610 0 580 5 0 5 5 0 8 1 rwobjpl 64 17334 0 14133 52 0 52 52 0 8 0 pdppl 4096 1229 0 1160 101 30 71 85 0 8 2 pvpl 32 14257 0 0 116 1 115 115 0 265 0 pmappl 248 610 0 580 3 0 3 3 0 8 0 extentpl 40 55 0 38 1 0 1 1 0 8 0 phpool 112 281 0 33 8 0 8 8 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:437 panic(ffffffff8343b582) at panic+0x1e5 sys/kern/subr_prf.c:198 __assert(ffffffff833e7d34,ffffffff833f04dc,3b0,ffffffff833f0524) at __assert+0x29 refcnt_finalize(ffff80003c527988,ffffffff8332fc97) at refcnt_finalize+0x1c8 sys/kern/kern_synch.c:945 pppx_if_destroy(ffff80002a4a1000,ffff80003c527980) at pppx_if_destroy+0x3d sys/net/if_pppx.c:806 pppxclose(205b9a,1,2000,ffff8000398c07c0) at pppxclose+0xa0 sys/net/if_pppx.c:553 spec_close(ffff80003c4e6a80) at spec_close+0x412 VOP_CLOSE(fffffd806bd84e90,1,fffffd807f7d3680,ffff8000398c07c0) at VOP_CLOSE+0x133 sys/kern/vfs_vops.c:156 vn_closefile(fffffd806bc13bf0,ffff8000398c07c0) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd806bc13bf0,ffff8000398c07c0) at vn_closefile+0x12b sys/kern/vfs_vnops.c:615 fdrop(fffffd806bc13bf0,ffff8000398c07c0) at fdrop+0x126 sys/kern/kern_descrip.c:1265 closef(fffffd806bc13bf0,ffff8000398c07c0) at closef+0x192 sys/kern/kern_descrip.c:1249 finishdup(ffff8000398c07c0,fffffd806bc13db8,3,4,ffff80003c4e6cf0,2) at finishdup+0x444 sys/kern/kern_descrip.c:677 syscall(ffff80003c4e6da0) at syscall+0xbc6 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c4e6da0) at syscall+0xbc6 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xd81376f100, count: -14 ddb{0}> machine ddbcpu 1 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp x86_ipi_db(ffff800029aabff0) at x86_ipi_db+0x27 sys/arch/amd64/amd64/db_interface.c:393 x86_ipi_handler() at x86_ipi_handler+0xd9 sys/arch/amd64/amd64/ipi.c:106 Xresume_lapic_ipi() at Xresume_lapic_ipi+0x27 acpicpu_idle() at acpicpu_idle+0x41e sys/dev/acpi/acpicpu.c:1218 sched_idle(ffff800029aabff0) at sched_idle+0x558 sys/kern/kern_sched.c:182 end trace frame: 0x0, count: 10 ddb{1}> trace x86_ipi_db(ffff800029aabff0) at x86_ipi_db+0x27 sys/arch/amd64/amd64/db_interface.c:393 x86_ipi_handler() at x86_ipi_handler+0xd9 sys/arch/amd64/amd64/ipi.c:106 Xresume_lapic_ipi() at Xresume_lapic_ipi+0x27 acpicpu_idle() at acpicpu_idle+0x41e sys/dev/acpi/acpicpu.c:1218 sched_idle(ffff800029aabff0) at sched_idle+0x558 sys/kern/kern_sched.c:182 end trace frame: 0x0, count: -5