panic: kernel diagnostic assertion "refs != ~0" failed: file "/syzkaller/managers/multicore/kernel/sys/kern/kern_synch.c", line 955 Stopped at db_enter+0x25: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND 352854 24627 -1 0x1010 0x4080000 1 syz-executor db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff833b6772) at panic+0x1e5 sys/kern/subr_prf.c:198 __assert(ffffffff833f134e,ffffffff833fbdca,3bb,ffffffff83426019) at __assert+0x29 sys/kern/subr_prf.c:-1 refcnt_finalize(ffff80003c42a928,ffffffff833a39a8) at refcnt_finalize+0x1db sys/kern/kern_synch.c:956 pppx_if_destroy(205b9a,ffff80003c42a920) at pppx_if_destroy+0x3d sys/net/if_pppx.c:794 pppxclose(205b9a,81,2000,ffff800039be7250) at pppxclose+0xa0 sys/net/if_pppx.c:541 spec_close(ffff80003c4312e0) at spec_close+0x417 sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffd806036de58,81,fffffd80097fd410,ffff800039be7250) at VOP_CLOSE+0x132 sys/kern/vfs_vops.c:156 vn_closefile(fffffd806c856230,ffff800039be7250) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd806c856230,ffff800039be7250) at vn_closefile+0x12b sys/kern/vfs_vnops.c:615 fdrop(fffffd806c856230,ffff800039be7250) at fdrop+0x121 sys/kern/kern_descrip.c:1280 closef(fffffd806c856230,ffff800039be7250) at closef+0x192 sys/kern/kern_descrip.c:1264 fdfree(ffff800039be7250) at fdfree+0x116 sys/kern/kern_descrip.c:1195 exit1(ffff800039be7250,0,0,1) at exit1+0x576 sys/kern/kern_exit.c:215 sys_exit(ffff800039be7250,ffff80003c431650,ffff80003c4315a0) at sys_exit+0x1a sys/kern/kern_exit.c:-1 end trace frame: 0xffff80003c431640, count: 0 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 955 ddb{0}> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff833b6772) at panic+0x1e5 sys/kern/subr_prf.c:198 __assert(ffffffff833f134e,ffffffff833fbdca,3bb,ffffffff83426019) at __assert+0x29 sys/kern/subr_prf.c:-1 refcnt_finalize(ffff80003c42a928,ffffffff833a39a8) at refcnt_finalize+0x1db sys/kern/kern_synch.c:956 pppx_if_destroy(205b9a,ffff80003c42a920) at pppx_if_destroy+0x3d sys/net/if_pppx.c:794 pppxclose(205b9a,81,2000,ffff800039be7250) at pppxclose+0xa0 sys/net/if_pppx.c:541 spec_close(ffff80003c4312e0) at spec_close+0x417 sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffd806036de58,81,fffffd80097fd410,ffff800039be7250) at VOP_CLOSE+0x132 sys/kern/vfs_vops.c:156 vn_closefile(fffffd806c856230,ffff800039be7250) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd806c856230,ffff800039be7250) at vn_closefile+0x12b sys/kern/vfs_vnops.c:615 fdrop(fffffd806c856230,ffff800039be7250) at fdrop+0x121 sys/kern/kern_descrip.c:1280 closef(fffffd806c856230,ffff800039be7250) at closef+0x192 sys/kern/kern_descrip.c:1264 fdfree(ffff800039be7250) at fdfree+0x116 sys/kern/kern_descrip.c:1195 exit1(ffff800039be7250,0,0,1) at exit1+0x576 sys/kern/kern_exit.c:215 sys_exit(ffff800039be7250,ffff80003c431650,ffff80003c4315a0) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff80003c431650) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c431650) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:775 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x767ec658d4b0, count: -16 ddb{0}> show registers rdi 0 rsi 0x1 rbp 0xffff80003c4310b0 rbx 0xffffffff8389de07 cpu_info_full_primary+0x2e07 rdx 0 rcx 0xffff800039be7250 rax 0xffffffff8389cff0 cpu_info_full_primary+0x1ff0 r8 0x101010101010101 r9 0x8080808080808080 r10 0x394967d2d67ebe9a r11 0x777ecead69a5f22f r12 0xffffffff8389dc08 cpu_info_full_primary+0x2c08 r13 0 r14 0 r15 0x1 rip 0xffffffff812b5c35 db_enter+0x25 cs 0x8 rflags 0x246 rsp 0xffff80003c4310a0 ss 0 db_enter+0x25: addq $0x8,%rsp ddb{0}> show proc PROC (syz-executor) tid=197414 pid=52214 tcnt=0 stat=onproc flags process=1008 proc=2000 runpri=32, usrpri=50, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0xffff800039be7250 scnt=-1 ecnt=1 forw=0xffffffffffffffff, list=0xffff800039be6fb8,0xffff800039be6a98 process=0xffff8000fffed828 user=0xffff80003c42c000, vmspace=0xfffffd806c8d9d78 estcpu=36, cpticks=2, pctcpu=0.0, user=0, sys=1, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 36047 82606 59800 0 2 0 syz-executor 36047 367517 59800 0 3 0x4000000 smrbar syz-executor 26931 509567 3500 0 2 0 syz-executor 26931 497214 3500 0 3 0x4000080 fsleep syz-executor 42072 267311 73281 0 2 0 syz-executor 42072 423323 73281 0 3 0x4000080 netcon syz-executor 24627 176306 11978 -1 3 0x3010 suspend syz-executor 24627 352854 11978 -1 7 0x4081010 syz-executor 2224 360460 0 0 3 0x14200 acct acct 95696 86211 0 0 3 0x14280 nfsidl nfsio 56134 246150 0 0 3 0x14280 nfsidl nfsio 49223 500924 0 0 3 0x14280 nfsidl nfsio 10185 169607 0 0 3 0x14280 nfsidl nfsio 70055 32167 0 0 3 0x14280 nfsidl nfsio 34616 378341 0 0 3 0x14280 nfsidl nfsio 99059 262182 0 0 3 0x14280 nfsidl nfsio 86309 1195 0 0 3 0x14280 nfsidl nfsio 56462 210849 0 0 3 0x14280 nfsidl nfsio 450 186328 0 0 3 0x14280 nfsidl nfsio 29618 509503 0 0 3 0x14280 nfsidl nfsio 60219 510271 0 0 3 0x14280 nfsidl nfsio 42553 191353 0 0 3 0x14280 nfsidl nfsio 80409 393410 0 0 3 0x14280 nfsidl nfsio 62386 136812 0 0 3 0x14280 nfsidl nfsio 56655 62882 0 0 3 0x14280 nfsidl nfsio 98535 153162 0 0 3 0x14280 nfsidl nfsio 97016 131163 0 0 3 0x14280 nfsidl nfsio 74273 1824 0 0 3 0x14280 nfsidl nfsio 19486 45610 0 0 3 0x14280 nfsidl nfsio 59668 487772 55950 0 2 0xc82 syz-executor 36166 243241 55950 0 2 0xc82 syz-executor 11978 305399 55950 0 2 0xc82 syz-executor 59800 509046 55950 0 3 0x82 nanoslp syz-executor 96516 7626 55950 0 3 0x82 nanoslp syz-executor 3500 32642 55950 0 2 0xc82 syz-executor 11238 83689 55950 0 3 0x82 nanoslp syz-executor 73281 401943 55950 0 3 0x82 nanoslp syz-executor 55950 438882 7301 0 3 0x82 kqread syz-executor 7301 186245 46610 0 3 0x10008a sigsusp ksh 46610 80838 27147 0 3 0x98 kqread sshd-session 27147 286448 48606 0 3 0x92 kqread sshd-session 49542 173610 1 0 3 0x100083 ttyin getty 48606 434034 1 0 3 0x88 kqread sshd 296 12194 68586 74 3 0x1100092 bpf pflogd 68586 124455 1 0 3 0x80 sbwait pflogd 46275 152942 14671 73 3 0x1100090 kqread syslogd 14671 251314 1 0 3 0x100082 sbwait syslogd 33813 122481 1 0 3 0x100080 kqread resolvd 97282 465348 66617 77 3 0x100092 kqread dhcpleased 14277 164301 66617 77 3 0x100092 kqread dhcpleased 66617 138394 1 0 3 0x80 kqread dhcpleased 15410 120869 0 0 3 0x14200 bored smr 46809 445115 0 0 3 0x14200 pgzero zerothread 78488 404483 0 0 3 0x14200 aiodoned aiodoned 60507 51137 0 0 3 0x14200 syncer update 857 380307 0 0 3 0x14200 cleaner cleaner 17536 8275 0 0 3 0x14200 reaper reaper 39030 471770 0 0 3 0x14200 pgdaemon pagedaemon 93402 100603 0 0 3 0x14200 bored viomb 14853 221248 0 0 3 0x40014200 acpi0 acpi0 8046 82023 0 0 3 0x40014200 idle1 61584 316160 0 0 3 0x14200 bored softnet1 52615 81278 0 0 3 0x14200 bored softnet0 1142 6708 0 0 3 0x14200 bored systqmp 28112 62884 0 0 3 0x14200 bored systq 11733 305932 0 0 3 0x14200 tmoslp softclockmp 37906 98726 0 0 3 0x40014200 tmoslp softclock 55699 118746 0 0 3 0x40014200 idle0 1 469569 0 0 3 0x82 wait init 0 0 -1 0 3 0x10010200 scheduler swapper ddb{0}> show all locks Process 24627 (syz-executor) thread 0xffff800039be42d0 (352854) exclusive rrwlock inode r = 0 (0xfffffd806c0ba6a8) #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:570 #5 vn_write+0x18f sys/kern/vfs_vnops.c:405 #6 dofilewritev+0x242 sys/kern/sys_generic.c:380 #7 sys_write+0xa2 sys/kern/sys_generic.c:300 #8 syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] #8 syscall+0xbd4 sys/arch/amd64/amd64/trap.c:775 #9 Xsyscall+0x128 ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 11067 12097K 12239K 166960K 12398 0 pcb 17 13K 14K 166960K 114 0 rtable 238 9K 9K 166960K 432 0 pf 39 18K 81K 166960K 97 0 ifaddr 42 7K 8K 166960K 76 0 ifgroup 55 2K 2K 166960K 116 0 sysctl 3 1K 9K 166960K 8 0 counters 74 37K 38K 166960K 146 0 ioctlops 0 0K 4K 166960K 1537 0 iov 0 0K 16K 166960K 9 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1342 84K 85K 166960K 1576 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 5K 166960K 6 0 VM map 2 1K 1K 166960K 2 0 sem 10 0K 0K 166960K 11 0 dirhash 12 2K 2K 166960K 15 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 18 65K 97K 166960K 432 0 proc 72 115K 180K 166960K 554 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 31 0 in_multi 89 6K 7K 166960K 125 0 ether_multi 1 0K 0K 166960K 4 0 mrt 0 0K 0K 166960K 3 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 85 387K 387K 166960K 85 0 exec 0 0K 1K 166960K 543 0 fusefs mount 1 32K 32K 166960K 1 0 pfkey data 0 0K 0K 166960K 5 0 tdb 3 0K 0K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 264 176K 190K 166960K 5995 0 UVM aobj 4 2K 2K 166960K 5 0 pinsyscall 43 86K 106K 166960K 1591 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 19 0 NDP 13 0K 2K 166960K 48 0 temp 48 8676K 8930K 166960K 14444 0 kqueue 13 20K 30K 166960K 94 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 92 0 89 2 1 1 2 0 8 0 rtentry 176 126 0 24 6 0 6 6 0 8 0 unpcb 144 272 0 255 2 0 2 2 0 8 1 syncache 336 4 0 4 2 1 1 1 0 8 1 tcpcb 736 128 0 121 4 3 1 4 0 8 0 arp 136 20 0 3 1 0 1 1 0 8 0 inpcb 328 383 0 373 4 0 4 4 0 8 3 nd6 152 24 0 3 1 0 1 1 0 8 0 pkpcb 40 6 0 6 1 0 1 1 0 8 1 kcovpl 48 8 0 0 1 0 1 1 0 8 0 ppxss 1192 29 0 27 1 0 1 1 0 8 0 pppxif 1504 10 0 9 1 0 1 1 0 8 0 pffrent 40 2 0 2 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 pfrktable 1344 3 0 1 1 0 1 1 0 8 0 pfanchor 1288 1 0 0 1 0 1 1 0 8 0 pfrule 1360 4 0 2 1 0 1 1 0 8 0 art_heap8 4096 2 0 0 2 0 2 2 0 8 0 art_heap4 256 484 0 70 29 0 29 29 0 8 2 art_table 40 486 0 70 5 0 5 5 0 8 0 art_node 32 124 0 31 1 0 1 1 0 8 0 sysvmsgpl 40 2 0 0 1 0 1 1 0 8 0 semapl 112 9 0 1 1 0 1 1 0 8 0 shmpl 112 2 0 1 1 0 1 1 0 8 0 dirhash 1024 19 0 2 3 0 3 3 0 8 0 dino2pl 256 2173 0 661 96 0 96 96 0 8 0 ffsino 296 2173 0 661 117 0 117 117 0 8 0 nchpl 144 2804 0 1100 64 0 64 64 0 8 0 rtmask 32 5 0 5 1 0 1 1 0 8 1 vnodes 216 2345 0 0 131 0 131 131 0 8 0 namei 1024 8859 0 8859 1 0 1 1 0 8 1 percpumem 16 88 0 36 1 0 1 1 0 8 0 pfiaddrpl 120 1 0 0 1 0 1 1 0 8 0 kstatmem 264 64 0 36 3 0 3 3 0 8 1 scsiplug 72 2 0 2 1 0 1 1 0 8 1 scxspl 216 10794 0 10794 8 5 3 7 1 8 3 plimitpl 152 120 0 101 1 0 1 1 0 8 0 sigapl 424 772 0 703 8 0 8 8 0 8 0 knotepl 120 581 0 0 18 0 18 18 0 8 0 kqueuepl 224 131 0 118 2 0 2 2 0 8 1 pipepl 344 177 0 150 6 0 6 6 0 8 3 fdescpl 528 734 0 702 3 0 3 3 0 8 0 filepl 160 3915 0 3681 16 4 12 15 0 8 1 lockfpl 104 238 0 235 2 1 1 2 0 8 0 lockfspl 48 47 0 44 1 0 1 1 0 8 0 sessionpl 144 23 0 14 1 0 1 1 0 8 0 pgrppl 48 32 0 15 1 0 1 1 0 8 0 ucredpl 104 462 0 448 1 0 1 1 0 8 0 zombiepl 144 708 0 703 1 0 1 1 0 8 0 processpl 1232 772 0 703 6 0 6 6 0 8 0 procpl 664 1303 0 1230 8 0 8 8 0 8 0 sosppl 176 2 0 2 1 1 0 1 0 8 0 sockpl 752 760 0 730 7 0 7 7 0 8 3 mcl64k 65536 5 0 0 1 0 1 1 0 8 0 mcl16k 16384 5 0 0 1 0 1 1 0 8 0 mcl12k 12288 1 0 0 1 0 1 1 0 8 0 mcl9k 9216 1 0 0 1 0 1 1 0 8 0 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 20 0 0 3 0 3 3 0 8 0 mtagpl 96 5 0 0 1 0 1 1 0 8 0 mbufpl 256 163 0 0 11 0 11 11 0 8 0 bufpl 280 3834 0 131 265 0 265 265 0 8 0 anonpl 32 6728 0 0 55 0 55 55 0 246 0 amapchunkpl 152 18217 0 17666 28 1 27 27 0 158 5 amappl16 200 2425 0 2281 10 2 8 8 0 8 0 amappl15 192 20 0 20 1 1 0 1 0 8 0 amappl14 184 8 0 8 1 1 0 1 0 8 0 amappl13 176 433 0 432 1 0 1 1 0 8 0 amappl12 168 1106 0 1063 3 0 3 3 0 8 0 amappl11 160 18 0 18 1 1 0 1 0 8 0 amappl10 152 50 0 36 1 0 1 1 0 8 0 amappl9 144 265 0 264 1 0 1 1 0 8 0 amappl8 136 104 0 102 1 0 1 1 0 8 0 amappl7 128 87 0 85 1 0 1 1 0 8 0 amappl6 120 285 0 271 1 0 1 1 0 8 0 amappl5 112 81 0 70 1 0 1 1 0 8 0 amappl4 104 430 0 401 1 0 1 1 0 8 0 amappl3 96 3155 0 3049 3 0 3 3 0 8 0 amappl2 88 855 0 778 2 0 2 2 0 8 0 amappl1 80 10672 0 10079 16 2 14 15 0 8 0 amappl 88 5183 0 4998 5 0 5 5 0 92 0 uvmvnodes 80 112 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 7 0 7 2 2 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 1 1 0 1 1 0 8 0 uaddrrnd 24 734 0 702 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 734 0 702 1 0 1 1 0 8 0 vmmpekpl 168 7951 0 7919 2 0 2 2 0 8 0 vmmpepl 168 54256 0 52157 92 0 92 92 0 357 0 vmsppl 488 733 0 702 6 1 5 5 0 8 1 rwobjpl 80 17522 0 16349 25 0 25 25 0 8 0 pdppl 4096 1475 0 1404 109 36 73 87 0 8 2 pvpl 32 14381 0 0 116 0 116 116 0 265 0 pmappl 256 733 0 702 4 1 3 3 0 8 1 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 285 0 43 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:438 panic(ffffffff833b6772) at panic+0x1e5 sys/kern/subr_prf.c:198 __assert(ffffffff833f134e,ffffffff833fbdca,3bb,ffffffff83426019) at __assert+0x29 sys/kern/subr_prf.c:-1 refcnt_finalize(ffff80003c42a928,ffffffff833a39a8) at refcnt_finalize+0x1db sys/kern/kern_synch.c:956 pppx_if_destroy(205b9a,ffff80003c42a920) at pppx_if_destroy+0x3d sys/net/if_pppx.c:794 pppxclose(205b9a,81,2000,ffff800039be7250) at pppxclose+0xa0 sys/net/if_pppx.c:541 spec_close(ffff80003c4312e0) at spec_close+0x417 sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffd806036de58,81,fffffd80097fd410,ffff800039be7250) at VOP_CLOSE+0x132 sys/kern/vfs_vops.c:156 vn_closefile(fffffd806c856230,ffff800039be7250) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd806c856230,ffff800039be7250) at vn_closefile+0x12b sys/kern/vfs_vnops.c:615 fdrop(fffffd806c856230,ffff800039be7250) at fdrop+0x121 sys/kern/kern_descrip.c:1280 closef(fffffd806c856230,ffff800039be7250) at closef+0x192 sys/kern/kern_descrip.c:1264 fdfree(ffff800039be7250) at fdfree+0x116 sys/kern/kern_descrip.c:1195 exit1(ffff800039be7250,0,0,1) at exit1+0x576 sys/kern/kern_exit.c:215 sys_exit(ffff800039be7250,ffff80003c431650,ffff80003c4315a0) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff80003c431650) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c431650) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:775 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x767ec658d4b0, count: -16 ddb{0}> machine ddbcpu 1 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp x86_ipi_db(ffff8000299ddff0) 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(ffffffff83945b40) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:142 [inline] __mp_lock(ffffffff83945b40) at __mp_lock+0x192 sys/kern/kern_lock.c:173 __mp_acquire_count(ffffffff83945b40,1) at __mp_acquire_count+0x58 sys/kern/kern_lock.c:-1 sleep_finish(ffffffffffffffff,1) at sleep_finish+0x2d8 sys/kern/kern_synch.c:369 biowait(fffffd805fcf9018) at biowait+0xc6 sys/kern/vfs_bio.c:1242 bwrite(fffffd805fcf9018) at bwrite+0x2e7 sys/kern/vfs_bio.c:754 ffs_write(ffff80003a7eed90) at ffs_write+0x810 sys/ufs/ffs/ffs_vnops.c:377 VOP_WRITE(fffffd8060046c18,ffff80003a7eef48,7,fffffd80097fd410) at VOP_WRITE+0x101 sys/kern/vfs_vops.c:245 vn_write(fffffd806c856e10,ffff80003a7eef48,0) at vn_write+0x1d3 sys/kern/vfs_vnops.c:408 dofilewritev(ffff800039be42d0,4,ffff80003a7eef48,0,ffff80003a7ef000) at dofilewritev+0x242 sys/kern/sys_generic.c:380 sys_write(ffff800039be42d0,ffff80003a7ef0b0,ffff80003a7ef000) at sys_write+0xa2 sys/kern/sys_generic.c:300 syscall(ffff80003a7ef0b0) at syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003a7ef0b0) at syscall+0xbd4 sys/arch/amd64/amd64/trap.c:775 end trace frame: 0xffff80003a7ef130, count: 0 ddb{1}> trace x86_ipi_db(ffff8000299ddff0) 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(ffffffff83945b40) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:142 [inline] __mp_lock(ffffffff83945b40) at __mp_lock+0x192 sys/kern/kern_lock.c:173 __mp_acquire_count(ffffffff83945b40,1) at __mp_acquire_count+0x58 sys/kern/kern_lock.c:-1 sleep_finish(ffffffffffffffff,1) at sleep_finish+0x2d8 sys/kern/kern_synch.c:369 biowait(fffffd805fcf9018) at biowait+0xc6 sys/kern/vfs_bio.c:1242 bwrite(fffffd805fcf9018) at bwrite+0x2e7 sys/kern/vfs_bio.c:754 ffs_write(ffff80003a7eed90) at ffs_write+0x810 sys/ufs/ffs/ffs_vnops.c:377 VOP_WRITE(fffffd8060046c18,ffff80003a7eef48,7,fffffd80097fd410) at VOP_WRITE+0x101 sys/kern/vfs_vops.c:245 vn_write(fffffd806c856e10,ffff80003a7eef48,0) at vn_write+0x1d3 sys/kern/vfs_vnops.c:408 dofilewritev(ffff800039be42d0,4,ffff80003a7eef48,0,ffff80003a7ef000) at dofilewritev+0x242 sys/kern/sys_generic.c:380 sys_write(ffff800039be42d0,ffff80003a7ef0b0,ffff80003a7ef000) at sys_write+0xa2 sys/kern/sys_generic.c:300 syscall(ffff80003a7ef0b0) at syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003a7ef0b0) at syscall+0xbd4 sys/arch/amd64/amd64/trap.c:775 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x9f6fa61dda0, count: -15