panic: kernel diagnostic assertion "vp->v_usecount == 0" failed: file "/syzkaller/managers/multicore/kernel/sys/kern/vfs_subr.c", line 639 Stopped at db_enter+0x25: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND 268511 71980 0 0x8000000 0 1 syz-executor *103318 22208 0 0x8000000 0x4000000 0K syz-executor db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:437 panic(ffffffff830d710a) at panic+0x1e5 sys/kern/subr_prf.c:198 __assert(ffffffff8308c51e,ffffffff830af90e,27f,ffffffff8302bc90) at __assert+0x29 vdoom(fffffd80679e8dc0) at vdoom+0x105 sys/kern/vfs_subr.c:641 ufs_inactive(ffff80002ad58378) at ufs_inactive+0x188 sys/ufs/ufs/ufs_inode.c:89 VOP_INACTIVE(fffffd80679e8dc0,ffff80003619c028) at VOP_INACTIVE+0x107 sys/kern/vfs_vops.c:495 vclean(fffffd80679e8dc0,8,ffff80003619c028) at vclean+0x234 sys/kern/vfs_subr.c:1107 vgonel(fffffd80679e8dc0,ffff80003619c028) at vgonel+0xec sys/kern/vfs_subr.c:1197 vop_generic_revoke(ffff80002ad58508) at vop_generic_revoke+0x32a sys/kern/vfs_default.c:105 VOP_REVOKE(fffffd8079a93b20,1) at VOP_REVOKE+0x65 sys/kern/vfs_vops.c:291 ptmioctl(5100,40287401,ffff80002ad589d0,3,ffff80003619c028) at ptmioctl+0x832 sys/kern/tty_pty.c:1172 VOP_IOCTL(fffffd806ded2440,40287401,ffff80002ad589d0,3,fffffd807f7d3548,ffff80003619c028) at VOP_IOCTL+0xac sys/kern/vfs_vops.c:264 vn_ioctl(fffffd806830b600,40287401,ffff80002ad589d0,ffff80003619c028) at vn_ioctl+0xf6 sys/kern/vfs_vnops.c:525 sys_ioctl(ffff80003619c028,ffff80002ad58bb0,ffff80002ad58b00) at sys_ioctl+0x67c end trace frame: 0xffff80002ad58ba0, 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 "vp->v_usecount == 0" failed: file "/syzkaller/managers/multicore/kernel/sys/kern/vfs_subr.c", line 639 ddb{0}> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:437 panic(ffffffff830d710a) at panic+0x1e5 sys/kern/subr_prf.c:198 __assert(ffffffff8308c51e,ffffffff830af90e,27f,ffffffff8302bc90) at __assert+0x29 vdoom(fffffd80679e8dc0) at vdoom+0x105 sys/kern/vfs_subr.c:641 ufs_inactive(ffff80002ad58378) at ufs_inactive+0x188 sys/ufs/ufs/ufs_inode.c:89 VOP_INACTIVE(fffffd80679e8dc0,ffff80003619c028) at VOP_INACTIVE+0x107 sys/kern/vfs_vops.c:495 vclean(fffffd80679e8dc0,8,ffff80003619c028) at vclean+0x234 sys/kern/vfs_subr.c:1107 vgonel(fffffd80679e8dc0,ffff80003619c028) at vgonel+0xec sys/kern/vfs_subr.c:1197 vop_generic_revoke(ffff80002ad58508) at vop_generic_revoke+0x32a sys/kern/vfs_default.c:105 VOP_REVOKE(fffffd8079a93b20,1) at VOP_REVOKE+0x65 sys/kern/vfs_vops.c:291 ptmioctl(5100,40287401,ffff80002ad589d0,3,ffff80003619c028) at ptmioctl+0x832 sys/kern/tty_pty.c:1172 VOP_IOCTL(fffffd806ded2440,40287401,ffff80002ad589d0,3,fffffd807f7d3548,ffff80003619c028) at VOP_IOCTL+0xac sys/kern/vfs_vops.c:264 vn_ioctl(fffffd806830b600,40287401,ffff80002ad589d0,ffff80003619c028) at vn_ioctl+0xf6 sys/kern/vfs_vnops.c:525 sys_ioctl(ffff80003619c028,ffff80002ad58bb0,ffff80002ad58b00) at sys_ioctl+0x67c syscall(ffff80002ad58bb0) at syscall+0xbb6 mi_syscall sys/sys/syscall_mi.h:179 [inline] syscall(ffff80002ad58bb0) at syscall+0xbb6 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xc478897c280, count: -16 ddb{0}> show registers rdi 0 rsi 0x1 rbp 0xffff80002ad58200 rbx 0xffffffff834a3d87 cpu_info_full_primary+0x2d87 rdx 0 rcx 0xffff80003619c028 rax 0xffffffff834a2ff0 cpu_info_full_primary+0x1ff0 r8 0x101010101010101 r9 0x8080808080808080 r10 0xc0e173c029b47e0 r11 0x1821622067fbff8e r12 0xffffffff834a3b88 cpu_info_full_primary+0x2b88 r13 0 r14 0 r15 0x1 rip 0xffffffff813bf665 db_enter+0x25 cs 0x8 rflags 0x246 rsp 0xffff80002ad581f0 ss 0x10 db_enter+0x25: addq $0x8,%rsp ddb{0}> show proc PROC (syz-executor) tid=103318 pid=22208 tcnt=4 stat=onproc flags process=8000000 proc=4000000 runpri=32, usrpri=86, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff80003619c7c0,0xffff80003619cce0 process=0xffff800031c0b630 user=0xffff80002ad53000, vmspace=0xfffffd806c765dd8 estcpu=36, cpticks=1, pctcpu=0.0, user=0, sys=1, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 27483 158497 15024 0 2 0x8000000 syz-executor 71980 268511 83193 0 7 0x8000000 syz-executor 71980 285148 83193 0 2 0xc000000 syz-executor 40090 274668 45488 0 2 0x8000000 syz-executor 38987 259962 58168 0 3 0x8000080 nanoslp syz-executor 38987 425296 58168 0 3 0xc000080 kqpoll syz-executor 38987 137582 58168 0 3 0xc000080 fsleep syz-executor 22208 424479 66693 0 3 0x8000080 nanoslp syz-executor 22208 356475 66693 0 3 0xc000080 fsleep syz-executor *22208 103318 66693 0 7 0xc000000 syz-executor 22208 496824 66693 0 3 0xc000080 fsleep syz-executor 66693 66509 73140 0 3 0x8000082 nanoslp syz-executor 83229 137331 73140 0 3 0x8000002 biowait syz-executor 83193 506635 73140 0 3 0x8000082 nanoslp syz-executor 45488 276581 73140 0 3 0x8000082 nanoslp syz-executor 78740 377636 73140 0 2 0x8000002 syz-executor 58168 348565 73140 0 3 0x8000082 nanoslp syz-executor 80153 268869 73140 0 3 0x8000002 biowait syz-executor 15024 33689 73140 0 2 0x8000002 syz-executor 60971 74187 0 0 3 0x14200 acct acct 99869 89165 0 0 3 0x14280 nfsidl nfsio 9129 156514 0 0 3 0x14280 nfsidl nfsio 62676 335077 0 0 3 0x14280 nfsidl nfsio 52560 463606 0 0 3 0x14280 nfsidl nfsio 41408 431416 0 0 3 0x14280 nfsidl nfsio 13978 451930 0 0 3 0x14280 nfsidl nfsio 61862 367400 0 0 3 0x14280 nfsidl nfsio 16925 457137 0 0 3 0x14280 nfsidl nfsio 53376 364775 0 0 3 0x14280 nfsidl nfsio 29566 266343 0 0 3 0x14280 nfsidl nfsio 56160 17075 0 0 3 0x14280 nfsidl nfsio 37256 146023 0 0 3 0x14280 nfsidl nfsio 16799 48262 0 0 3 0x14280 nfsidl nfsio 76369 133047 0 0 3 0x14280 nfsidl nfsio 87470 187695 0 0 3 0x14280 nfsidl nfsio 62359 438785 0 0 3 0x14280 nfsidl nfsio 229 347175 0 0 3 0x14280 nfsidl nfsio 30583 431862 0 0 3 0x14280 nfsidl nfsio 83461 489605 0 0 3 0x14280 nfsidl nfsio 85554 252862 0 0 3 0x14280 nfsidl nfsio 63379 58547 0 0 3 0x14200 bored sosplice 73140 215844 78939 0 3 0x8000082 kqread syz-executor 78939 346512 10861 0 3 0x810008a sigsusp ksh 10861 444478 70538 0 3 0x18000098 kqread sshd-session 70538 24830 53583 0 3 0x18000092 kqread sshd-session 19211 189893 1 0 3 0x18100083 ttyopn getty 53583 284950 1 0 3 0x18000088 kqread sshd 44218 288732 92636 74 3 0x19100092 bpf pflogd 92636 215221 1 0 3 0x18000080 sbwait pflogd 83376 124113 84477 73 2 0x19100010 syslogd 84477 264608 1 0 3 0x18100082 sbwait syslogd 86731 393282 1 0 3 0x18100080 kqread resolvd 15523 173177 28114 77 3 0x18100092 kqread dhcpleased 69597 466613 28114 77 3 0x18100092 kqread dhcpleased 28114 202675 1 0 3 0x18000080 kqread dhcpleased 89556 323812 0 0 3 0x14200 bored smr 16888 247589 0 0 3 0x14200 pgzero zerothread 105 88464 0 0 3 0x14200 aiodoned aiodoned 10161 386121 0 0 3 0x14200 syncer update 39057 252446 0 0 3 0x14200 cleaner cleaner 431 387945 0 0 3 0x14200 reaper reaper 18618 31272 0 0 3 0x14200 pgdaemon pagedaemon 87234 13648 0 0 3 0x14200 bored viomb 94020 15454 0 0 3 0x40014200 acpi0 acpi0 11992 456304 0 0 3 0x40014200 idle1 58855 87383 0 0 3 0x14200 bored softnet3 98852 349599 0 0 3 0x14200 bored softnet2 38293 100867 0 0 3 0x14200 bored softnet1 16405 205296 0 0 3 0x14200 bored softnet0 59294 110363 0 0 3 0x14200 bored systqmp 52524 181959 0 0 3 0x14200 bored systq 92267 202092 0 0 3 0x14200 tmoslp softclockmp 73859 341762 0 0 3 0x40014200 tmoslp softclock 57622 62543 0 0 3 0x40014200 idle0 1 98992 0 0 3 0x8000082 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks CPU 0: exclusive mutex /syzkaller/managers/multicore/kernel/sys/kern/vfs_subr.c:119 r = 0 (0xffffffff834e2e38) #0 witness_lock+0x5b8 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5b8 sys/kern/subr_witness.c:1151 #1 mtx_enter_try+0x178 #2 mtx_enter+0x60 sys/kern/kern_lock.c:239 #3 vdoom+0x2b sys/kern/vfs_subr.c:639 #4 ufs_inactive+0x188 sys/ufs/ufs/ufs_inode.c:89 #5 VOP_INACTIVE+0x107 sys/kern/vfs_vops.c:495 #6 vclean+0x234 sys/kern/vfs_subr.c:1107 #7 vgonel+0xec sys/kern/vfs_subr.c:1197 #8 vop_generic_revoke+0x32a sys/kern/vfs_default.c:105 #9 VOP_REVOKE+0x65 sys/kern/vfs_vops.c:291 #10 ptmioctl+0x832 sys/kern/tty_pty.c:1172 #11 VOP_IOCTL+0xac sys/kern/vfs_vops.c:264 #12 vn_ioctl+0xf6 sys/kern/vfs_vnops.c:525 #13 sys_ioctl+0x67c #14 syscall+0xbb6 mi_syscall sys/sys/syscall_mi.h:179 [inline] #14 syscall+0xbb6 sys/arch/amd64/amd64/trap.c:577 #15 Xsyscall+0x128 Process 22208 (syz-executor) thread 0xffff80003619c028 (103318) Process 83229 (syz-executor) thread 0xffff800034592ce8 (137331) Process 80153 (syz-executor) thread 0xffff800034592550 (268869) ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10214 10367K 11209K 166960K 13410 0 pcb 17 18K 20K 166960K 401 0 rtable 216 6K 7K 166960K 2941 0 pf 36 10K 10K 166960K 248 0 ifaddr 46 16K 16K 166960K 394 0 ifgroup 60 2K 2K 166960K 436 0 sysctl 3 0K 0K 166960K 5 0 counters 66 36K 37K 166960K 262 0 ioctlops 0 0K 4K 166960K 1669 0 iov 0 0K 14K 166960K 258 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1454 91K 92K 166960K 3711 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 9K 166960K 28 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 0K 166960K 205 0 dirhash 15 2K 2K 166960K 36 0 ACPI 1697 195K 286K 166960K 12548 0 file desc 15 53K 93K 166960K 2393 0 sigio 0 0K 0K 166960K 53 0 proc 70 91K 128K 166960K 2890 0 subproc 104 6K 6K 166960K 1144 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 150 0 in_multi 99 7K 7K 166960K 1009 0 ether_multi 1 0K 0K 166960K 13 0 mrt 1 0K 0K 166960K 2 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 115 519K 519K 166960K 115 0 exec 0 0K 1K 166960K 1691 0 pfkey data 0 0K 0K 166960K 3 0 tdb 3 0K 0K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 208 72K 95K 166960K 19137 0 UVM aobj 16 2K 2K 166960K 16 0 pinsyscall 40 80K 108K 166960K 5542 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 114 0 NDP 13 0K 2K 166960K 287 0 temp 77 6816K 6884K 166960K 45536 0 kqueue 13 20K 30K 166960K 175 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 120 545 0 542 8 7 1 3 0 8 0 rtentry 112 1023 0 924 4 1 3 4 0 8 0 unpcb 144 1263 0 1246 17 14 3 6 0 8 2 syncache 336 5 0 5 3 2 1 1 0 8 1 tcpqe 32 1 0 1 1 0 1 1 0 8 1 tcpcb 808 477 0 472 17 15 2 8 0 8 1 arp 120 182 0 164 1 0 1 1 0 8 0 inpcb 384 2174 0 2165 35 24 11 11 0 8 9 nd6 136 273 0 249 1 0 1 1 0 8 0 pkpcb 40 11 0 11 4 3 1 1 0 8 1 kcovpl 48 88 0 80 1 0 1 1 0 8 0 ppxss 1168 11 0 11 4 3 1 1 0 8 1 pffrag 232 17 0 16 1 0 1 1 0 482 0 pffrnode 88 16 0 15 1 0 1 1 0 8 0 pffrent 40 73 0 72 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 24 171 0 131 1 0 1 1 0 8 0 pfstkey 128 171 0 131 2 0 2 2 0 8 0 pfstate 376 171 0 131 6 1 5 6 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 4061 0 3616 32 4 28 30 0 8 0 art_table 32 4062 0 3616 4 0 4 4 0 8 0 art_node 16 1013 0 924 1 0 1 1 0 8 0 sysvmsgpl 40 14 0 5 1 0 1 1 0 8 0 semapl 112 202 0 192 1 0 1 1 0 8 0 shmpl 112 13 0 0 1 0 1 1 0 8 0 dirhash 1024 33 0 14 3 0 3 3 0 8 0 dino2pl 256 3790 0 2129 104 0 104 104 0 8 0 ffsino 272 3790 0 2129 111 0 111 111 0 8 0 nchpl 144 5661 0 3884 68 1 67 67 0 8 0 uvmvnodes 80 5762 0 0 118 0 118 118 0 8 0 vnodes 216 5762 0 0 321 0 321 321 0 8 0 namei 1024 28520 0 28520 5 4 1 2 0 8 1 percpumem 16 145 0 98 1 0 1 1 0 8 0 vcpupl 3904 2 0 1 2 1 1 1 0 8 0 vmpool 696 40 0 39 5 4 1 1 0 8 0 kstatmem 264 222 0 196 2 0 2 2 0 8 0 scsiplug 72 3 0 3 2 2 0 1 0 8 0 scxspl 216 31510 0 31508 19 18 1 8 1 8 0 plimitpl 152 624 0 606 1 0 1 1 0 8 0 sigapl 424 2553 0 2484 11 2 9 9 0 8 0 futexpl 64 20114 0 20111 9 8 1 1 0 8 0 knotepl 120 814 0 0 23 0 23 23 0 8 0 kqueuepl 216 530 0 486 14 11 3 5 0 8 0 pipepl 320 649 0 622 15 10 5 8 0 8 2 fdescpl 496 2513 0 2484 9 4 5 5 0 8 0 filepl 152 15720 0 15437 55 41 14 23 0 8 2 lockfpl 104 417 0 415 1 0 1 1 0 8 0 lockfspl 48 178 0 176 1 0 1 1 0 8 0 sessionpl 144 102 0 93 1 0 1 1 0 8 0 pgrppl 48 205 0 188 1 0 1 1 0 8 0 ucredpl 104 2074 0 2061 1 0 1 1 0 8 0 zombiepl 144 2484 0 2484 1 0 1 1 0 8 1 processpl 1152 2553 0 2484 7 1 6 6 0 8 0 procpl 648 4500 0 4425 15 7 8 8 0 8 0 sosppl 168 12 0 12 7 6 1 1 0 8 1 sockpl 664 4000 0 3971 56 44 12 20 0 8 9 mcl64k 65536 8 0 0 1 0 1 1 0 8 0 mcl16k 16384 3 0 0 1 0 1 1 0 8 0 mcl12k 12288 2 0 0 1 0 1 1 0 8 0 mcl9k 9216 2 0 0 1 0 1 1 0 8 0 mcl8k 8192 8 0 0 1 0 1 1 0 8 0 mcl4k 4096 7 0 0 1 0 1 1 0 8 0 mcl2k 2048 261 0 0 31 0 31 31 0 8 0 mtagpl 96 9 0 0 1 0 1 1 0 8 0 mbufpl 256 1125 0 0 61 0 61 61 0 8 0 bufpl 280 9734 0 2087 547 0 547 547 0 8 0 anonpl 24 346264 0 343024 80 29 51 52 0 185 20 amapchunkpl 152 59518 0 59117 49 17 32 33 0 158 12 amappl16 200 5437 0 5418 49 47 2 14 0 8 0 amappl15 192 8 0 8 2 1 1 1 0 8 1 amappl14 184 277 0 264 1 0 1 1 0 8 0 amappl13 176 8 0 8 1 1 0 1 0 8 0 amappl12 168 4417 0 4389 4 2 2 3 0 8 0 amappl11 160 54 0 40 1 0 1 1 0 8 0 amappl10 152 8 0 8 1 1 0 1 0 8 0 amappl9 144 143 0 143 1 1 0 1 0 8 0 amappl8 136 33 0 31 1 0 1 1 0 8 0 amappl7 128 316 0 303 1 0 1 1 0 8 0 amappl6 120 962 0 961 1 0 1 1 0 8 0 amappl5 112 457 0 445 1 0 1 1 0 8 0 amappl4 104 560 0 540 1 0 1 1 0 8 0 amappl3 96 11618 0 11524 8 4 4 4 0 8 1 amappl2 88 1734 0 1667 2 0 2 2 0 8 0 amappl1 80 19392 0 18818 14 1 13 14 0 8 0 amappl 88 18127 0 17983 7 2 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 15 0 0 1 0 1 1 0 8 0 uaddrrnd 24 2553 0 2523 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 2553 0 2523 1 0 1 1 0 8 0 vmmpekpl 168 22928 0 22873 4 0 4 4 0 8 0 vmmpepl 168 157191 0 155435 118 33 85 94 0 357 2 vmsppl 440 2552 0 2523 6 2 4 5 0 8 0 rwobjpl 56 50109 0 43423 96 1 95 95 0 8 0 pdppl 4096 5113 0 5047 219 147 72 85 0 8 6 pvpl 32 29584 0 0 241 2 239 239 0 265 0 pmappl 248 2552 0 2523 3 0 3 3 0 8 0 extentpl 40 56 0 38 1 0 1 1 0 8 0 phpool 112 598 0 177 13 0 13 13 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(ffffffff830d710a) at panic+0x1e5 sys/kern/subr_prf.c:198 __assert(ffffffff8308c51e,ffffffff830af90e,27f,ffffffff8302bc90) at __assert+0x29 vdoom(fffffd80679e8dc0) at vdoom+0x105 sys/kern/vfs_subr.c:641 ufs_inactive(ffff80002ad58378) at ufs_inactive+0x188 sys/ufs/ufs/ufs_inode.c:89 VOP_INACTIVE(fffffd80679e8dc0,ffff80003619c028) at VOP_INACTIVE+0x107 sys/kern/vfs_vops.c:495 vclean(fffffd80679e8dc0,8,ffff80003619c028) at vclean+0x234 sys/kern/vfs_subr.c:1107 vgonel(fffffd80679e8dc0,ffff80003619c028) at vgonel+0xec sys/kern/vfs_subr.c:1197 vop_generic_revoke(ffff80002ad58508) at vop_generic_revoke+0x32a sys/kern/vfs_default.c:105 VOP_REVOKE(fffffd8079a93b20,1) at VOP_REVOKE+0x65 sys/kern/vfs_vops.c:291 ptmioctl(5100,40287401,ffff80002ad589d0,3,ffff80003619c028) at ptmioctl+0x832 sys/kern/tty_pty.c:1172 VOP_IOCTL(fffffd806ded2440,40287401,ffff80002ad589d0,3,fffffd807f7d3548,ffff80003619c028) at VOP_IOCTL+0xac sys/kern/vfs_vops.c:264 vn_ioctl(fffffd806830b600,40287401,ffff80002ad589d0,ffff80003619c028) at vn_ioctl+0xf6 sys/kern/vfs_vnops.c:525 sys_ioctl(ffff80003619c028,ffff80002ad58bb0,ffff80002ad58b00) at sys_ioctl+0x67c syscall(ffff80002ad58bb0) at syscall+0xbb6 mi_syscall sys/sys/syscall_mi.h:179 [inline] syscall(ffff80002ad58bb0) at syscall+0xbb6 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xc478897c280, count: -16 ddb{0}> machine ddbcpu 1 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp x86_ipi_db(ffff800029b7bff0) 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 end of kernel end trace frame: 0x7e3a72988a90, count: 12 ddb{1}> trace x86_ipi_db(ffff800029b7bff0) 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 end of kernel end trace frame: 0x7e3a72988a90, count: -3