šjšjpanic: kernel diagnostic assertion "refs != ~0" failed: file "/syzkaller/managers/multicore/kernel/sys/kern/kern_synch.c", line 953 Stopped at db_enter+0x25: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND *145055 41206 0 0 0x4000000 0K syz-executor 451235 49158 77 0x100012 0x1 1 dhcpleased db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff833952a6) at panic+0x1e5 sys/kern/subr_prf.c:198 __assert(ffffffff833d6cb0,ffffffff833e1459,3b9,ffffffff8340b082) at __assert+0x29 sys/kern/subr_prf.c:-1 refcnt_finalize(ffff80003c436348,ffffffff8338f819) at refcnt_finalize+0x1db sys/kern/kern_synch.c:954 pppx_if_destroy(285b9a,ffff80003c436340) at pppx_if_destroy+0x3d sys/net/if_pppx.c:794 pppxclose(285b9a,41,2000,ffff80003b80d778) at pppxclose+0xa0 sys/net/if_pppx.c:541 spec_close(ffff800034bded20) at spec_close+0x417 sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffd805ea0ba50,41,fffffd80097fb750,ffff80003b80d778) at VOP_CLOSE+0x132 sys/kern/vfs_vops.c:156 vn_closefile(fffffd806caeb8e8,ffff80003b80d778) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd806caeb8e8,ffff80003b80d778) at vn_closefile+0x12b sys/kern/vfs_vnops.c:615 fdrop(fffffd806caeb8e8,ffff80003b80d778) at fdrop+0x121 sys/kern/kern_descrip.c:1280 sys_ioctl(ffff80003b80d778,ffff800034bdf030,ffff800034bdef80) at sys_ioctl+0x30b sys/kern/sys_generic.c:516 syscall(ffff800034bdf030) at syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff800034bdf030) at syscall+0xbd4 sys/arch/amd64/amd64/trap.c:765 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x82c83e6b5d0, count: 2 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 953 ddb{0}> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff833952a6) at panic+0x1e5 sys/kern/subr_prf.c:198 __assert(ffffffff833d6cb0,ffffffff833e1459,3b9,ffffffff8340b082) at __assert+0x29 sys/kern/subr_prf.c:-1 refcnt_finalize(ffff80003c436348,ffffffff8338f819) at refcnt_finalize+0x1db sys/kern/kern_synch.c:954 pppx_if_destroy(285b9a,ffff80003c436340) at pppx_if_destroy+0x3d sys/net/if_pppx.c:794 pppxclose(285b9a,41,2000,ffff80003b80d778) at pppxclose+0xa0 sys/net/if_pppx.c:541 spec_close(ffff800034bded20) at spec_close+0x417 sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffd805ea0ba50,41,fffffd80097fb750,ffff80003b80d778) at VOP_CLOSE+0x132 sys/kern/vfs_vops.c:156 vn_closefile(fffffd806caeb8e8,ffff80003b80d778) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd806caeb8e8,ffff80003b80d778) at vn_closefile+0x12b sys/kern/vfs_vnops.c:615 fdrop(fffffd806caeb8e8,ffff80003b80d778) at fdrop+0x121 sys/kern/kern_descrip.c:1280 sys_ioctl(ffff80003b80d778,ffff800034bdf030,ffff800034bdef80) at sys_ioctl+0x30b sys/kern/sys_generic.c:516 syscall(ffff800034bdf030) at syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff800034bdf030) at syscall+0xbd4 sys/arch/amd64/amd64/trap.c:765 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x82c83e6b5d0, count: -13 ddb{0}> show registers rdi 0 rsi 0x1 rbp 0xffff800034bdeaf0 rbx 0xffffffff83827ddf cpu_info_full_primary+0x2ddf rdx 0 rcx 0xffff80003b80d778 rax 0xffffffff83826ff0 cpu_info_full_primary+0x1ff0 r8 0x101010101010101 r9 0x8080808080808080 r10 0xefa9c029a9193d4d r11 0xebea8ca3571fb15c r12 0xffffffff83827be0 cpu_info_full_primary+0x2be0 r13 0 r14 0 r15 0x1 rip 0xffffffff814258f5 db_enter+0x25 cs 0x8 rflags 0x246 rsp 0xffff800034bdeae0 ss 0x10 db_enter+0x25: addq $0x8,%rsp ddb{0}> show proc PROC (syz-executor) tid=145055 pid=41206 tcnt=4 stat=onproc flags process=0 proc=4000000 runpri=32, usrpri=61, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff80003b80cd18,0xffff80003b80cfc0 process=0xffff80002a3d3508 user=0xffff800034bda000, vmspace=0xfffffd806f18e028 estcpu=11, cpticks=1, pctcpu=0.0, user=0, sys=1, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 18378 347766 87301 0 2 0 syz-executor 41653 167428 85943 0 2 0 syz-executor 41653 284773 85943 0 2 0x4000000 syz-executor 41206 230543 12844 0 2 0 syz-executor 41206 256045 12844 0 3 0x4000080 kqsel syz-executor *41206 145055 12844 0 7 0x4000000 syz-executor 41206 306856 12844 0 3 0x4000000 smrbar syz-executor 41050 425085 42818 0 2 0x2 syz-executor 97428 337614 2036 0 3 0x80 nanoslp syz-executor 97428 172687 2036 0 3 0x4000080 lockf syz-executor 97428 241651 2036 0 3 0x4000080 fsleep syz-executor 45181 331692 36276 0 3 0x80 fsleep syz-executor 45181 50694 36276 0 3 0x4000080 kqread syz-executor 51951 487624 93507 0 3 0x80 fsleep syz-executor 51951 105100 93507 0 3 0x4000080 kqread syz-executor 44391 281039 0 0 3 0x14200 acct acct 93507 456459 42818 0 3 0x82 nanoslp syz-executor 77643 149201 42818 0 2 0x2 syz-executor 2036 406820 42818 0 3 0x82 nanoslp syz-executor 87301 524265 42818 0 3 0x82 nanoslp syz-executor 85943 379888 42818 0 2 0x2 syz-executor 36276 200119 42818 0 3 0x82 nanoslp syz-executor 12844 420158 42818 0 3 0x82 nanoslp syz-executor 42818 312513 86182 0 3 0x82 kqread syz-executor 86182 365902 91689 0 3 0x10008a sigsusp ksh 91689 115204 54113 0 3 0x98 kqread sshd-session 54113 134954 65343 0 3 0x92 kqread sshd-session 39193 458795 1 0 3 0x100083 ttyopn getty 65343 216754 1 0 3 0x88 kqread sshd 2358 141693 67334 74 3 0x1100092 bpf pflogd 67334 463606 1 0 3 0x80 sbwait pflogd 76428 246671 81885 73 3 0x1100090 kqread syslogd 81885 501304 1 0 3 0x100082 sbwait syslogd 38655 430448 1 0 2 0x100080 resolvd 49158 451235 13256 77 7 0x100013 dhcpleased 80090 258891 13256 77 3 0x100092 kqread dhcpleased 13256 310057 1 0 3 0x80 kqread dhcpleased 58683 218986 0 0 3 0x14200 bored smr 74865 386231 0 0 2 0x14200 zerothread 23312 456685 0 0 3 0x14200 aiodoned aiodoned 22827 276981 0 0 3 0x14200 syncer update 1399 392912 0 0 3 0x14200 cleaner cleaner 34908 139302 0 0 3 0x14200 reaper reaper 37815 509745 0 0 3 0x14200 pgdaemon pagedaemon 66323 355654 0 0 3 0x14200 bored viomb 40708 170373 0 0 3 0x40014200 acpi0 acpi0 27223 169114 0 0 3 0x40014200 idle1 29308 83808 0 0 3 0x14200 bored softnet1 2228 294570 0 0 3 0x14200 bored softnet0 46249 19138 0 0 3 0x14200 bored systqmp 96010 433685 0 0 3 0x14200 bored systq 98763 437452 0 0 3 0x14200 tmoslp softclockmp 50634 140542 0 0 3 0x40014200 tmoslp softclock 84577 405821 0 0 3 0x40014200 idle0 1 152251 0 0 3 0x82 wait init 0 0 -1 0 3 0x10010200 scheduler swapper ddb{0}> show all locks Process 41206 (syz-executor) thread 0xffff80003b80d778 (145055) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff838c9fc0) #0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160 #1 vn_closefile+0x41 sys/kern/vfs_vnops.c:608 #2 fdrop+0x121 sys/kern/kern_descrip.c:1280 #3 sys_ioctl+0x30b sys/kern/sys_generic.c:516 #4 syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] #4 syscall+0xbd4 sys/arch/amd64/amd64/trap.c:765 #5 Xsyscall+0x128 Process 77643 (syz-executor) thread 0xffff8000fffefa08 (149201) exclusive rrwlock inode r = 0 (0xfffffd806a40f208) #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+0xa3 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:3113 #10 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] #10 syscall+0xb17 sys/arch/amd64/amd64/trap.c:765 #11 Xsyscall+0x128 exclusive rrwlock inode r = 0 (0xfffffd806c6ac6a0) #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+0xa3 sys/kern/vfs_vops.c:527 #4 vn_lock+0xa4 sys/kern/vfs_vnops.c:570 #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:3098 #8 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] #8 syscall+0xb17 sys/arch/amd64/amd64/trap.c:765 #9 Xsyscall+0x128 ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10196 11018K 11238K 166960K 11685 0 pcb 17 16K 18K 166960K 178 0 rtable 220 8K 9K 166960K 539 0 pf 36 18K 21K 166960K 96 0 ifaddr 43 7K 8K 166960K 74 0 ifgroup 56 2K 2K 166960K 92 0 sysctl 3 1K 9K 166960K 13 0 counters 70 37K 37K 166960K 100 0 ioctlops 1 1K 4K 166960K 1613 0 iov 0 0K 16K 166960K 18 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1404 88K 89K 166960K 1755 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 5K 166960K 9 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 0K 166960K 20 0 dirhash 12 2K 2K 166960K 18 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 16 54K 93K 166960K 601 0 sigio 0 0K 0K 166960K 15 0 proc 72 115K 164K 166960K 658 0 subproc 63 3K 4K 166960K 99 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 65 0 in_multi 94 6K 7K 166960K 151 0 ether_multi 1 0K 0K 166960K 4 0 mrt 2 0K 0K 166960K 6 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 73 334K 334K 166960K 73 0 exec 0 0K 1K 166960K 488 0 fusefs mount 1 32K 32K 166960K 1 0 pfkey data 0 0K 0K 166960K 2 0 tdb 3 0K 0K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 220 159K 191K 166960K 7163 0 UVM aobj 15 2K 2K 166960K 15 0 pinsyscall 41 82K 106K 166960K 1840 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 30 0 NDP 12 0K 2K 166960K 45 0 temp 47 8656K 8724K 166960K 24898 0 kqueue 16 26K 30K 166960K 110 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 78 0 74 1 0 1 1 0 8 0 rtentry 176 165 0 72 5 0 5 5 0 8 0 unpcb 144 516 0 499 12 6 6 6 0 8 5 syncache 336 10 0 10 2 2 0 1 0 8 0 tcpcb 736 163 0 158 4 3 1 4 0 8 0 arp 136 28 0 10 1 0 1 1 0 8 0 inpcb 328 737 0 728 13 6 7 7 0 8 5 nd6 152 33 0 12 1 0 1 1 0 8 0 pkpcb 40 5 0 5 2 1 1 1 0 8 1 kcovpl 48 11 0 4 1 0 1 1 0 8 0 ppxss 1192 11 0 10 2 1 1 1 0 8 0 pppxif 1504 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 5 0 2 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 pfanchor 1288 3 0 0 1 0 1 1 0 8 0 pftag 88 2 0 0 1 0 1 1 0 8 0 pfstitem 24 47 0 12 1 0 1 1 0 8 0 pfstkey 128 47 0 12 2 0 2 2 0 8 0 pfstate 384 47 0 12 5 0 5 5 0 8 0 pfrule 1344 31 0 26 2 1 1 2 0 8 0 rttmr 136 1 0 1 1 1 0 1 0 8 0 art_heap8 4096 4 0 0 4 0 4 4 0 8 0 art_heap4 256 696 0 296 33 2 31 31 0 8 3 art_table 40 700 0 296 5 0 5 5 0 8 0 art_node 32 164 0 80 1 0 1 1 0 8 0 sysvmsgpl 40 2 0 2 1 0 1 1 0 8 1 semupl 112 2 0 2 1 1 0 1 0 8 0 semapl 112 17 0 7 1 0 1 1 0 8 0 shmpl 112 12 0 0 1 0 1 1 0 8 0 dirhash 1024 21 0 4 3 0 3 3 0 8 0 dino2pl 256 2392 0 867 96 0 96 96 0 8 0 ffsino 296 2392 0 867 118 0 118 118 0 8 0 nchpl 144 3219 0 1504 64 0 64 64 0 8 0 rtmask 32 2 0 2 1 0 1 1 0 8 1 vnodes 216 2698 0 0 150 0 150 150 0 8 0 namei 1024 11262 0 11261 3 2 1 2 0 8 0 percpumem 16 65 0 15 1 0 1 1 0 8 0 kstatmem 264 48 0 22 3 0 3 3 0 8 1 scsiplug 72 1 0 1 1 1 0 1 0 8 0 scxspl 216 17295 0 17295 11 10 1 8 1 8 1 plimitpl 152 98 0 81 1 0 1 1 0 8 0 sigapl 424 920 0 873 7 1 6 7 0 8 0 knotepl 120 558 0 0 17 0 17 17 0 8 0 kqueuepl 224 224 0 208 5 0 5 5 0 8 4 pipepl 344 238 0 211 8 0 8 8 0 8 5 fdescpl 528 897 0 867 3 0 3 3 0 8 0 filepl 160 5352 0 5140 26 8 18 20 0 8 8 lockfpl 104 282 0 278 1 0 1 1 0 8 0 lockfspl 48 103 0 100 1 0 1 1 0 8 0 sessionpl 144 26 0 17 1 0 1 1 0 8 0 pgrppl 48 44 0 27 1 0 1 1 0 8 0 ucredpl 104 660 0 647 1 0 1 1 0 8 0 zombiepl 144 873 0 873 1 0 1 1 0 8 1 processpl 1232 920 0 873 5 0 5 5 0 8 1 procpl 664 1648 0 1593 6 0 6 6 0 8 0 sosppl 176 2 0 2 1 1 0 1 0 8 0 sockpl 752 1353 0 1323 30 13 17 18 0 8 12 mcl64k 65536 4 0 0 1 0 1 1 0 8 0 mcl16k 16384 1 0 0 1 0 1 1 0 8 0 mcl12k 12288 1 0 0 1 0 1 1 0 8 0 mcl9k 9216 2 0 0 1 0 1 1 0 8 0 mcl8k 8192 4 0 0 1 0 1 1 0 8 0 mcl4k 4096 120 0 0 15 0 15 15 0 8 0 mcl2k2 2112 1 0 0 1 0 1 1 0 8 0 mcl2k 2048 38 0 0 5 0 5 5 0 8 0 mtagpl 96 5 0 0 1 0 1 1 0 8 0 mbufpl 256 1835 0 0 115 0 115 115 0 8 0 bufpl 280 6817 0 680 439 0 439 439 0 8 0 anonpl 32 9131 0 0 74 0 74 74 0 246 0 amapchunkpl 152 23565 0 23149 43 7 36 36 0 158 17 amappl16 200 3240 0 3205 30 15 15 15 0 8 9 amappl15 192 14 0 13 1 0 1 1 0 8 0 amappl14 184 41 0 41 1 1 0 1 0 8 0 amappl13 176 471 0 469 1 0 1 1 0 8 0 amappl12 168 1277 0 1238 3 0 3 3 0 8 0 amappl11 160 14 0 14 2 2 0 1 0 8 0 amappl10 152 50 0 36 1 0 1 1 0 8 0 amappl9 144 252 0 252 1 1 0 1 0 8 0 amappl8 136 58 0 55 1 0 1 1 0 8 0 amappl7 128 95 0 94 1 0 1 1 0 8 0 amappl6 120 330 0 316 1 0 1 1 0 8 0 amappl5 112 79 0 69 1 0 1 1 0 8 0 amappl4 104 451 0 419 1 0 1 1 0 8 0 amappl3 96 3871 0 3794 4 1 3 3 0 8 0 amappl2 88 1010 0 934 2 0 2 2 0 8 0 amappl1 80 11625 0 11038 16 2 14 15 0 8 0 amappl 88 6262 0 6119 6 1 5 5 0 92 0 uvmvnodes 80 2698 0 0 56 0 56 56 0 8 0 dma65536 65536 1 0 1 1 1 0 1 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 128 254 0 254 2 2 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 14 0 0 1 0 1 1 0 8 0 uaddrrnd 24 897 0 867 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 897 0 867 1 0 1 1 0 8 0 vmmpekpl 168 9086 0 9040 3 0 3 3 0 8 0 vmmpepl 168 64586 0 62745 107 8 99 99 0 357 6 vmsppl 488 896 0 867 6 1 5 5 0 8 1 rwobjpl 80 22694 0 19084 83 3 80 80 0 8 1 pdppl 4096 1801 0 1734 107 34 73 85 0 8 6 pvpl 32 16360 0 0 132 0 132 132 0 265 0 pmappl 256 896 0 867 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 397 0 46 11 0 11 11 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(ffffffff833952a6) at panic+0x1e5 sys/kern/subr_prf.c:198 __assert(ffffffff833d6cb0,ffffffff833e1459,3b9,ffffffff8340b082) at __assert+0x29 sys/kern/subr_prf.c:-1 refcnt_finalize(ffff80003c436348,ffffffff8338f819) at refcnt_finalize+0x1db sys/kern/kern_synch.c:954 pppx_if_destroy(285b9a,ffff80003c436340) at pppx_if_destroy+0x3d sys/net/if_pppx.c:794 pppxclose(285b9a,41,2000,ffff80003b80d778) at pppxclose+0xa0 sys/net/if_pppx.c:541 spec_close(ffff800034bded20) at spec_close+0x417 sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffd805ea0ba50,41,fffffd80097fb750,ffff80003b80d778) at VOP_CLOSE+0x132 sys/kern/vfs_vops.c:156 vn_closefile(fffffd806caeb8e8,ffff80003b80d778) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd806caeb8e8,ffff80003b80d778) at vn_closefile+0x12b sys/kern/vfs_vnops.c:615 fdrop(fffffd806caeb8e8,ffff80003b80d778) at fdrop+0x121 sys/kern/kern_descrip.c:1280 sys_ioctl(ffff80003b80d778,ffff800034bdf030,ffff800034bdef80) at sys_ioctl+0x30b sys/kern/sys_generic.c:516 syscall(ffff800034bdf030) at syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff800034bdf030) at syscall+0xbd4 sys/arch/amd64/amd64/trap.c:765 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x82c83e6b5d0, count: -13 ddb{0}> machine ddbcpu 1 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp x86_ipi_db(ffff8000299edff0) 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(ffffffff838c9db8) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:134 [inline] __mp_lock(ffffffff838c9db8) at __mp_lock+0x192 sys/kern/kern_lock.c:165 ktrstruct(ffff80002a273c98,ffffffff833c1029,ffff80002a292380,20) at ktrstruct+0xdf sys/kern/kern_ktrace.c:313 sys_kevent(ffff80002a273c98,ffff80002a292700,ffff80002a292650) at sys_kevent+0x7bf sys/kern/kern_event.c:1327 syscall(ffff80002a292700) at syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80002a292700) at syscall+0xbd4 sys/arch/amd64/amd64/trap.c:765 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x70f1ce2dd7e0, count: 7 ddb{1}> trace x86_ipi_db(ffff8000299edff0) 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(ffffffff838c9db8) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:134 [inline] __mp_lock(ffffffff838c9db8) at __mp_lock+0x192 sys/kern/kern_lock.c:165 ktrstruct(ffff80002a273c98,ffffffff833c1029,ffff80002a292380,20) at ktrstruct+0xdf sys/kern/kern_ktrace.c:313 sys_kevent(ffff80002a273c98,ffff80002a292700,ffff80002a292650) at sys_kevent+0x7bf sys/kern/kern_event.c:1327 syscall(ffff80002a292700) at syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80002a292700) at syscall+0xbd4 sys/arch/amd64/amd64/trap.c:765 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x70f1ce2dd7e0, count: -8