panic: Caught invalid memory access at ffff800001abe832 size 2 op 0 Stopped at db_enter+0x17: popq %rbp TID PID UID PRFLAGS PFLAGS CPU COMMAND 110717 26121 0 0 0x4000001 1 syz-executor * 79623 26121 0 0 0x4000000 0K syz-executor db_enter() at db_enter+0x17 sys/arch/amd64/amd64/db_interface.c:457 panic(ffffffff8463c64f) at panic+0x270 sys/kern/subr_prf.c:198 __asan_load2_noabort(ffff800001abe832) at __asan_load2_noabort+0x107 knote_processfork(ffffffff85d370e0,a356) at knote_processfork+0x603 sys/kern/kern_event.c:2289 fork1(ffffffff85d36d80,f0,ffffffff830a12e0,0,0,ffff80003bb64780) at fork1+0x1225 sys/kern/kern_fork.c:511 kthread_create(ffffffff830a12e0,0,0,ffffffff84b844a0) at kthread_create+0xa8 sys/kern/kern_kthread.c:61 nfs_getset_niothreads(1) at nfs_getset_niothreads+0xe7 sys/nfs/nfs_syscalls.c:702 nfs_sysctl(ffff80003bb64988,1,0,ffff80003bb64960,200000000200,0,ffff80003bb64bd0) at nfs_sysctl+0x102 sys/nfs/nfs_vfsops.c:894 sys_sysctl(ffff800045fef4e8,ffff80003bb64bd0,ffff80003bb64b40) at sys_sysctl+0x54f sys/kern/kern_sysctl.c:309 syscall(ffff80003bb64bd0) at syscall+0x1089 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003bb64bd0) at syscall+0x1089 sys/arch/amd64/amd64/trap.c:791 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x1d8aabdbf40, count: 4 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: Caught invalid memory access at ffff800001abe832 size 2 op 0 ddb{0}> show kasan KASAN: invalid read of 2 bytes at 0xffff800001abe832 from pc 0xffffffff8302df13 KASAN: first bad byte at 0xffff800001abe832 (+0); shadow 0xfd: pool use-after-free (or unallocated item) KASAN: 0xffff800001abe832 is 50 bytes inside the 120-byte item [0xffff800001abe800..0xffff800001abe878) in pool 'knotepl' KASAN: allocated at: #0 pool_get+0x770 sys/kern/subr_pool.c:834 #1 kqueue_register+0x2f2 sys/kern/kern_event.c:1431 #2 sys_kevent+0x409 sys/kern/kern_event.c:1301 #3 syscall+0x1089 mi_syscall sys/sys/syscall_mi.h:176 [inline] #3 syscall+0x1089 sys/arch/amd64/amd64/trap.c:791 #4 Xsyscall+0x128 KASAN: freed at: #0 pool_put+0x79 sys/kern/subr_pool.c:1019 #1 kqueue_scan+0x1191 sys/kern/kern_event.c:1797 #2 sys_kevent+0x997 sys/kern/kern_event.c:1336 #3 syscall+0x1089 mi_syscall sys/sys/syscall_mi.h:176 [inline] #3 syscall+0x1089 sys/arch/amd64/amd64/trap.c:791 #4 Xsyscall+0x128 KASAN: pc: knote_processfork+0x603 KASAN: call trace: #0 __asan_load2_noabort+0xe6 kasan_shadow_check sys/kern/subr_kasan.c:-1 [inline] #0 __asan_load2_noabort+0xe6 sys/kern/subr_kasan.c:1097 #1 knote_processfork+0x603 sys/kern/kern_event.c:2289 #2 fork1+0x1225 sys/kern/kern_fork.c:511 #3 kthread_create+0xa8 sys/kern/kern_kthread.c:61 #4 nfs_getset_niothreads+0xe7 sys/nfs/nfs_syscalls.c:702 #5 nfs_sysctl+0x102 sys/nfs/nfs_vfsops.c:894 #6 sys_sysctl+0x54f sys/kern/kern_sysctl.c:309 #7 syscall+0x1089 mi_syscall sys/sys/syscall_mi.h:176 [inline] #7 syscall+0x1089 sys/arch/amd64/amd64/trap.c:791 #8 Xsyscall+0x128 KASAN: shadow of 0xffff800001abe700..0xffff800001abe980 (1 cell = 8 bytes): 0xffff800001abe700: 08 08 08 08 08 08 08 08 08 08 08 08 08 08 08 08 0xffff800001abe780: 08 08 08 08 08 08 08 08 08 08 08 08 08 08 08 08 >0xffff800001abe800: fd fd fd fd fd fd[fd]fd fd fd fd fd fd fd fd 08 0xffff800001abe880: 08 08 08 08 08 08 08 08 08 08 08 08 08 08 08 08 0xffff800001abe900: 08 08 08 08 08 08 08 08 08 08 08 08 08 08 08 08 KASAN: legend: 00 valid; 01..07 partial; fb malloc redzone; fc malloc freed; fd pool freed; fe kmem; fa global; f1..f4/f8 stack/scope ddb{0}> trace db_enter() at db_enter+0x17 sys/arch/amd64/amd64/db_interface.c:457 panic(ffffffff8463c64f) at panic+0x270 sys/kern/subr_prf.c:198 __asan_load2_noabort(ffff800001abe832) at __asan_load2_noabort+0x107 knote_processfork(ffffffff85d370e0,a356) at knote_processfork+0x603 sys/kern/kern_event.c:2289 fork1(ffffffff85d36d80,f0,ffffffff830a12e0,0,0,ffff80003bb64780) at fork1+0x1225 sys/kern/kern_fork.c:511 kthread_create(ffffffff830a12e0,0,0,ffffffff84b844a0) at kthread_create+0xa8 sys/kern/kern_kthread.c:61 nfs_getset_niothreads(1) at nfs_getset_niothreads+0xe7 sys/nfs/nfs_syscalls.c:702 nfs_sysctl(ffff80003bb64988,1,0,ffff80003bb64960,200000000200,0,ffff80003bb64bd0) at nfs_sysctl+0x102 sys/nfs/nfs_vfsops.c:894 sys_sysctl(ffff800045fef4e8,ffff80003bb64bd0,ffff80003bb64b40) at sys_sysctl+0x54f sys/kern/kern_sysctl.c:309 syscall(ffff80003bb64bd0) at syscall+0x1089 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003bb64bd0) at syscall+0x1089 sys/arch/amd64/amd64/trap.c:791 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x1d8aabdbf40, count: -11 ddb{0}> show registers rdi 0 rsi 0x1 rbp 0xffff80003bb64330 rbx 0xffff80003bb643a0 rdx 0 rcx 0xffffffff84f15ff0 cpu_info_full_primary+0x1ff0 rax 0xffff800000167680 r8 0x101010101010101 r9 0x8080808080808080 r10 0xffff80003bb64118 r11 0xffffffff8237d880 x86_bus_space_io_read_1 r12 0xffffffff8463c64f .str.26+0x9a28f r13 0xffffffff84f16c10 cpu_info_full_primary+0x2c10 r14 0xffffffff84f16e0f cpu_info_full_primary+0x2e0f r15 0x1 rip 0xffffffff8389f5d7 db_enter+0x17 cs 0x8 rflags 0x246 rsp 0xffff80003bb64330 ss 0x10 db_enter+0x17: popq %rbp ddb{0}> show proc PROC (syz-executor) tid=79623 pid=26121 tcnt=4 stat=onproc flags process=0 proc=4000000 runpri=32, usrpri=57, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff800045fefa18,0xffff800045fee800 process=0xffff800045ff26a0 user=0xffff80003bb59000, vmspace=0xffff800001c527b8 estcpu=7, cpticks=26, pctcpu=0.4, user=0, sys=26, intr=0 ddb{0}> ps PID TID PPID UID S PRLAGS PFLAGS WAIT COMMAND 41814 205060 0 0 2 0x14000 0x200 swapper 90953 409434 8580 0 2 0 0 syz-executor 90953 482436 8580 0 2 0 0x4000000 syz-executor 90953 240996 8580 0 3 0 0x4000080 fsleep syz-executor 87196 464741 13485 0 3 0 0x80 fsleep syz-executor 87196 82987 13485 0 2 0 0x4000000 syz-executor 87196 376597 13485 0 2 0 0x4000000 syz-executor 87455 80416 54054 0 2 0 0 syz-executor 87455 149459 54054 0 3 0 0x4000080 nanoslp syz-executor 87455 191355 54054 0 2 0 0x4000000 syz-executor 87455 382681 54054 0 2 0 0x4000000 syz-executor 26121 219487 74504 0 2 0 0 syz-executor 26121 110717 74504 0 7 0 0x4000001 syz-executor 26121 80656 74504 0 2 0 0x4000080 syz-executor *26121 79623 74504 0 7 0 0x4000000 syz-executor 23627 78213 13636 0 2 0x2 0 syz-executor 41509 227160 13636 0 3 0x2 0x80 piperd syz-executor 63283 420505 13636 0 3 0x2 0x80 piperd syz-executor 34792 127189 13636 0 3 0x10000002 0x80 piperd syz-executor 8580 212289 13636 0 2 0x2 0 syz-executor 54054 233852 13636 0 2 0x2 0xc80 syz-executor 13485 40102 13636 0 2 0x2 0xc80 syz-executor 74504 92272 13636 0 2 0x2 0xc80 syz-executor 13636 193848 12470 0 2 0x2 0 syz-executor 12470 94762 44330 0 3 0x100002 0x88 sigsusp ksh 44330 38033 14778 0 3 0x10 0x88 kqread sshd-session 14778 304671 66372 0 3 0x12 0x80 kqread sshd-session 14867 115924 1 0 3 0x100003 0x80 ttyin getty 66372 480650 1 0 3 0 0x88 kqread sshd 44544 447041 9237 74 3 0x1100012 0x80 bpf pflogd 9237 397677 1 0 3 0 0x80 sbwait pflogd 57138 75934 37623 73 2 0x1100010 0x80 syslogd 37623 122448 1 0 3 0x100002 0x80 sbwait syslogd 12185 140349 1 0 3 0x100000 0x80 kqread resolvd 8054 109352 4888 77 3 0x100012 0x80 kqread dhcpleased 82460 45853 4888 77 3 0x100012 0x80 kqread dhcpleased 4888 28536 1 0 3 0 0x80 kqread dhcpleased 80270 138643 0 0 2 0x14000 0x200 smr 49174 336851 0 0 2 0x14000 0x200 zerothread 89022 411690 0 0 3 0x14000 0x200 aiodoned aiodoned 63723 60535 0 0 3 0x14000 0x200 syncer update 1266 445428 0 0 3 0x14000 0x200 cleaner cleaner 76247 208739 0 0 3 0x14000 0x200 reaper reaper 30802 333688 0 0 3 0x14000 0x200 pgdaemon pagedaemon 72990 426647 0 0 3 0x14000 0x200 bored viomb 3655 18880 0 0 3 0x14000 0x40000200 acpi0 acpi0 52457 2096 0 0 3 0x14000 0x40000200 idle1 63635 107820 0 0 3 0x14000 0x200 bored softnet1 71164 106115 0 0 3 0x14000 0x200 bored softnet0 94316 406431 0 0 3 0x14000 0x200 smrbar systqmp 18456 306428 0 0 3 0x14000 0x200 bored systq 13196 498924 0 0 2 0x14000 0x200 softclockmp 39345 83772 0 0 3 0x14000 0x40000200 tmoslp softclock 91354 109879 0 0 3 0x14000 0x40000200 idle0 1 33914 0 0 3 0x2 0x80 wait init 0 0 -1 0 3 0x10000 0x200 scheduler swapper ddb{0}> show all locks Process 26121 (syz-executor) thread 0xffff800045fef4e8 (79623) exclusive kernel_lock &kernel_lock r = 1 (0xffffffff85cda380) #0 witness_lock+0x632 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x632 sys/kern/subr_witness.c:1160 #1 sysctl_vslock+0x72 sys/kern/kern_sysctl.c:197 #2 sys_sysctl+0x460 sys/kern/kern_sysctl.c:304 #3 syscall+0x1089 mi_syscall sys/sys/syscall_mi.h:176 [inline] #3 syscall+0x1089 sys/arch/amd64/amd64/trap.c:791 #4 Xsyscall+0x128 exclusive rwlock sysctllk r = 0 (0xffffffff85073238) #0 witness_lock+0x632 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x632 sys/kern/subr_witness.c:1160 #1 rw_do_enter_write+0x53e sys/kern/kern_rwlock.c:320 #2 sysctl_vslock+0x37 sys/kern/kern_sysctl.c:192 #3 sys_sysctl+0x460 sys/kern/kern_sysctl.c:304 #4 syscall+0x1089 mi_syscall sys/sys/syscall_mi.h:176 [inline] #4 syscall+0x1089 sys/arch/amd64/amd64/trap.c:791 #5 Xsyscall+0x128 Process 94316 (systqmp) thread 0xffff800045ffecf8 (406431) shared rwlock systqmp r = 0 (0xffffffff853f4d38) #0 witness_lock+0x632 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x632 sys/kern/subr_witness.c:1160 #1 taskq_thread+0x1ba sys/kern/kern_task.c:442 #2 proc_trampoline+0x10 ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 11052 12249K 12533K 166960K 12198 0 pcb 17 24K 24K 166960K 19 0 rtable 215 11K 13K 166960K 351 0 pf 32 21K 22K 166960K 45 0 ifaddr 39 11K 12K 166960K 45 0 ifgroup 51 2K 2K 166960K 55 0 sysctl 1 1K 13K 166960K 5 0 counters 68 42K 42K 166960K 70 0 ioctlops 0 0K 4K 166960K 1485 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1295 83K 83K 166960K 1381 0 UFS quota 1 36K 36K 166960K 1 0 UFS mount 5 44K 44K 166960K 5 0 shm 2 2K 2K 166960K 2 0 VM map 2 1K 1K 166960K 2 0 sem 2 0K 0K 166960K 2 0 dirhash 12 2K 2K 166960K 12 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 14 49K 89K 166960K 150 0 sigio 0 0K 0K 166960K 66 0 proc 69 128K 193K 166960K 554 0 subproc 66 8K 9K 166960K 75 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 20K 20K 166960K 1 0 ip_moptions 0 0K 0K 166960K 4 0 in_multi 88 6K 7K 166960K 99 0 ether_multi 1 0K 0K 166960K 1 0 mrt 0 0K 0K 166960K 2 0 ISOFS mount 1 36K 36K 166960K 1 0 MSDOSFS mount 1 20K 20K 166960K 1 0 ttys 31 222K 222K 166960K 31 0 exec 0 0K 2K 166960K 383 0 fusefs mount 1 36K 36K 166960K 1 0 tdb 3 1K 1K 166960K 3 0 VM swap 14 124K 124K 166960K 15 0 UVM amap 215 268K 287K 166960K 3207 0 UVM aobj 4 4K 4K 166960K 4 0 pinsyscall 1063 1714K 1730K 166960K 1306 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 NDP 11 0K 2K 166960K 28 0 temp 31 9161K 9173K 166960K 3931 0 kqueue 15 45K 49K 166960K 30 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 28 0 0 1 0 1 1 0 8 0 rtpcb 120 33 0 30 1 0 1 1 0 8 0 rtentry 176 111 0 12 5 0 5 5 0 8 0 unpcb 144 54 0 34 1 0 1 1 0 8 0 syncache 336 4 0 4 1 0 1 1 0 8 1 tcpcb 736 9 0 4 1 0 1 1 0 8 0 arp 136 18 0 2 1 0 1 1 0 8 0 inpcb 328 74 0 65 1 0 1 1 0 8 0 nd6 152 24 0 3 1 0 1 1 0 8 0 kcovpl 48 8 0 1 1 0 1 1 0 8 0 pffrent 40 1 0 1 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 pfstitem 24 27 0 0 1 0 1 1 0 8 0 pfstkey 128 27 0 0 1 0 1 1 0 8 0 pfstate 448 27 0 0 3 0 3 3 0 8 0 pfrule 1360 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 256 453 0 44 29 0 29 29 0 8 2 art_table 40 454 0 44 5 0 5 5 0 8 0 art_node 32 111 0 12 1 0 1 1 0 8 0 shmpl 112 1 0 0 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 1594 0 123 93 0 93 93 0 8 0 ffsino 296 1594 0 123 114 0 114 114 0 8 0 nchpl 144 1802 0 101 64 0 64 64 0 8 0 vnodes 216 1693 0 0 95 0 95 95 0 8 0 namei 1024 6282 0 6282 2 1 1 2 0 8 1 percpumem 16 51 0 1 1 0 1 1 0 8 0 kstatmem 264 27 0 2 2 0 2 2 0 8 0 scxspl 216 6684 0 6684 4 3 1 3 1 8 1 plimitpl 152 32 0 15 1 0 1 1 0 8 0 sigapl 424 466 0 421 7 0 7 7 0 8 1 knotepl 120 60 0 0 2 0 2 2 0 8 0 kqueuepl 224 29 0 17 1 0 1 1 0 8 0 pipepl 344 131 0 104 3 0 3 3 0 8 0 fdescpl 528 449 0 421 3 0 3 3 0 8 0 filepl 160 1646 0 1432 10 0 10 10 0 8 1 lockfpl 104 16 0 14 1 0 1 1 0 8 0 lockfspl 48 9 0 7 1 0 1 1 0 8 0 sessionpl 144 57 0 48 1 0 1 1 0 8 0 pgrppl 48 66 0 49 1 0 1 1 0 8 0 ucredpl 104 97 0 84 1 0 1 1 0 8 0 zombiepl 144 421 0 421 1 0 1 1 0 8 1 processpl 1232 466 0 421 5 0 5 5 0 8 0 procpl 664 501 0 446 6 0 6 6 0 8 0 sockpl 752 162 0 130 4 0 4 4 0 8 0 mcl64k 65536 1 0 0 1 0 1 1 0 8 0 mcl8k 8192 2 0 0 1 0 1 1 0 8 0 mcl4k 4096 117 0 0 15 0 15 15 0 8 0 mcl2k 2048 17 0 0 3 0 3 3 0 8 0 mextrefs 64 15 0 0 1 0 1 1 0 8 0 mtagpl 96 2 0 0 1 0 1 1 0 8 0 mbufpl 256 155 0 0 10 0 10 10 0 8 0 bufpl 272 2330 0 106 149 0 149 149 0 8 0 anonpl 32 3827 0 0 31 0 31 31 0 222 0 amapchunkpl 152 8719 0 8308 20 0 20 20 0 158 2 amappl16 200 1954 0 1935 5 0 5 5 0 8 2 amappl15 192 8 0 8 2 2 0 1 0 8 0 amappl14 184 432 0 431 1 0 1 1 0 8 0 amappl13 176 124 0 112 1 0 1 1 0 8 0 amappl12 168 701 0 674 2 0 2 2 0 8 0 amappl11 160 10 0 10 1 1 0 1 0 8 0 amappl10 152 92 0 78 1 0 1 1 0 8 0 amappl9 144 270 0 270 1 0 1 1 0 8 1 amappl8 136 100 0 98 1 0 1 1 0 8 0 amappl7 128 153 0 140 1 0 1 1 0 8 0 amappl6 120 172 0 171 1 0 1 1 0 8 0 amappl5 112 128 0 117 1 0 1 1 0 8 0 amappl4 104 286 0 269 1 0 1 1 0 8 0 amappl3 96 1524 0 1444 3 0 3 3 0 8 0 amappl2 88 556 0 487 2 0 2 2 0 8 0 amappl1 80 10555 0 9969 15 0 15 15 0 8 1 amappl 88 2482 0 2340 4 0 4 4 0 92 0 uvmvnodes 80 98 0 0 2 0 2 2 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 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 3 0 0 1 0 1 1 0 8 0 uaddrrnd 24 449 0 421 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 449 0 421 1 0 1 1 0 8 0 vmmpekpl 168 5858 0 5822 3 0 3 3 0 8 0 vmmpepl 168 38864 0 37134 90 0 90 90 0 357 9 vmsppl 488 448 0 421 5 0 5 5 0 8 1 rwobjpl 80 14924 0 13944 26 0 26 26 0 8 3 pdppl 4096 906 0 842 94 12 82 84 0 8 18 pvpl 32 11367 0 0 92 0 92 92 0 265 0 pmappl 256 448 0 421 3 0 3 3 0 8 0 extentpl 40 46 0 28 1 0 1 1 0 8 0 phpool 120 414 0 16 13 0 13 13 0 8 0 ddb{0}> machine ddbcpu 0 Invalid cpu 0 ddb{0}> trace db_enter() at db_enter+0x17 sys/arch/amd64/amd64/db_interface.c:457 panic(ffffffff8463c64f) at panic+0x270 sys/kern/subr_prf.c:198 __asan_load2_noabort(ffff800001abe832) at __asan_load2_noabort+0x107 knote_processfork(ffffffff85d370e0,a356) at knote_processfork+0x603 sys/kern/kern_event.c:2289 fork1(ffffffff85d36d80,f0,ffffffff830a12e0,0,0,ffff80003bb64780) at fork1+0x1225 sys/kern/kern_fork.c:511 kthread_create(ffffffff830a12e0,0,0,ffffffff84b844a0) at kthread_create+0xa8 sys/kern/kern_kthread.c:61 nfs_getset_niothreads(1) at nfs_getset_niothreads+0xe7 sys/nfs/nfs_syscalls.c:702 nfs_sysctl(ffff80003bb64988,1,0,ffff80003bb64960,200000000200,0,ffff80003bb64bd0) at nfs_sysctl+0x102 sys/nfs/nfs_vfsops.c:894 sys_sysctl(ffff800045fef4e8,ffff80003bb64bd0,ffff80003bb64b40) at sys_sysctl+0x54f sys/kern/kern_sysctl.c:309 syscall(ffff80003bb64bd0) at syscall+0x1089 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003bb64bd0) at syscall+0x1089 sys/arch/amd64/amd64/trap.c:791 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x1d8aabdbf40, count: -11 ddb{0}> machine ddbcpu 1 Stopped at x86_ipi_db+0x19: leave x86_ipi_db(ffff800028fe3ff0) at x86_ipi_db+0x19 sys/arch/amd64/amd64/db_interface.c:412 x86_ipi_handler() at x86_ipi_handler+0x112 sys/arch/amd64/amd64/ipi.c:106 Xresume_lapic_ipi() at Xresume_lapic_ipi+0x27 __mp_lock(ffffffff85cd9b80) at __mp_lock+0x272 __mp_lock_spin sys/kern/kern_lock.c:142 [inline] __mp_lock(ffffffff85cd9b80) at __mp_lock+0x272 sys/kern/kern_lock.c:173 ktrstruct(ffff800045ff4020,ffffffff84b77c60,ffff80003971c720,20) at ktrstruct+0x13f sys/kern/kern_ktrace.c:314 sys_kevent(ffff800045ff4020,ffff80003971ca50,ffff80003971c9c0) at sys_kevent+0xacb sys/kern/kern_event.c:1343 syscall(ffff80003971ca50) at syscall+0x1089 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003971ca50) at syscall+0x1089 sys/arch/amd64/amd64/trap.c:791 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x1d8c6ee48c0, count: 7 ddb{1}> trace x86_ipi_db(ffff800028fe3ff0) at x86_ipi_db+0x19 sys/arch/amd64/amd64/db_interface.c:412 x86_ipi_handler() at x86_ipi_handler+0x112 sys/arch/amd64/amd64/ipi.c:106 Xresume_lapic_ipi() at Xresume_lapic_ipi+0x27 __mp_lock(ffffffff85cd9b80) at __mp_lock+0x272 __mp_lock_spin sys/kern/kern_lock.c:142 [inline] __mp_lock(ffffffff85cd9b80) at __mp_lock+0x272 sys/kern/kern_lock.c:173 ktrstruct(ffff800045ff4020,ffffffff84b77c60,ffff80003971c720,20) at ktrstruct+0x13f sys/kern/kern_ktrace.c:314 sys_kevent(ffff800045ff4020,ffff80003971ca50,ffff80003971c9c0) at sys_kevent+0xacb sys/kern/kern_event.c:1343 syscall(ffff80003971ca50) at syscall+0x1089 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003971ca50) at syscall+0x1089 sys/arch/amd64/amd64/trap.c:791 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x1d8c6ee48c0, count: -8