panic: kernel diagnostic assertion "__mp_lock_held(&sched_lock, curcpu()) == 0" failed: file "/syzkaller/managers/multicore/kernel/sys/kern/kern_lock.c", line 63 Stopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND 228186 1495 0 0 0 1 syz-executor.7 *346937 32786 0 0x1800 0x4080080 0 syz-executor.3 db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:437 panic(ffffffff825a0599) at panic+0x177 sys/kern/subr_prf.c:202 __assert(ffffffff82615d07,ffffffff825891d5,3f,ffffffff8264bc7b) at __assert+0x25 sys/kern/subr_prf.c:161 _kernel_lock() at _kernel_lock+0xb2 sys/kern/kern_lock.c:63 single_thread_check_locked(ffff8000fffef7a8,1,c) at single_thread_check_locked+0x1f6 sys/kern/kern_sig.c:2037 single_thread_check(ffff8000fffef7a8,1) at single_thread_check+0x4b sys/kern/kern_sig.c:2057 sleep_finish(ffff8000296126a0,1) at sleep_finish+0x75 sleep_signal_check sys/kern/kern_synch.c:464 [inline] sleep_finish(ffff8000296126a0,1) at sleep_finish+0x75 sys/kern/kern_synch.c:400 rwsleep(ffff8000fffef7a8,ffffffff829990c0,120,ffffffff82599d73,0) at rwsleep+0xd5 sys/kern/kern_synch.c:314 futex_wait(f67c296b3a0,2,0,2) at futex_wait+0x13c sys/kern/sys_futex.c:260 sys_futex(ffff8000fffef7a8,ffff800029612830,ffff800029612890) at sys_futex+0xf8 sys/kern/sys_futex.c:111 syscall(ffff800029612900) at syscall+0x484 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff800029612900) at syscall+0x484 sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xf686d957200, count: 3 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 "__mp_lock_held(&sched_lock, curcpu()) == 0" failed: file "/syzkaller/managers/multicore/kernel/sys/kern/kern_lock.c", line 63 ddb{0}> trace db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:437 panic(ffffffff825a0599) at panic+0x177 sys/kern/subr_prf.c:202 __assert(ffffffff82615d07,ffffffff825891d5,3f,ffffffff8264bc7b) at __assert+0x25 sys/kern/subr_prf.c:161 _kernel_lock() at _kernel_lock+0xb2 sys/kern/kern_lock.c:63 single_thread_check_locked(ffff8000fffef7a8,1,c) at single_thread_check_locked+0x1f6 sys/kern/kern_sig.c:2037 single_thread_check(ffff8000fffef7a8,1) at single_thread_check+0x4b sys/kern/kern_sig.c:2057 sleep_finish(ffff8000296126a0,1) at sleep_finish+0x75 sleep_signal_check sys/kern/kern_synch.c:464 [inline] sleep_finish(ffff8000296126a0,1) at sleep_finish+0x75 sys/kern/kern_synch.c:400 rwsleep(ffff8000fffef7a8,ffffffff829990c0,120,ffffffff82599d73,0) at rwsleep+0xd5 sys/kern/kern_synch.c:314 futex_wait(f67c296b3a0,2,0,2) at futex_wait+0x13c sys/kern/sys_futex.c:260 sys_futex(ffff8000fffef7a8,ffff800029612830,ffff800029612890) at sys_futex+0xf8 sys/kern/sys_futex.c:111 syscall(ffff800029612900) at syscall+0x484 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff800029612900) at syscall+0x484 sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xf686d957200, count: -12 ddb{0}> show registers rdi 0 rsi 0x1 rbp 0xffff800029612460 rbx 0xffffffff8297fbb7 cpu_info_full_primary+0x2bb7 rdx 0xffff800000bebd40 rcx 0 rax 0xffff8000fffef7a8 r8 0x101010101010101 r9 0x8080808080808080 r10 0xac9d1bb2f1b752c3 r11 0xba56fc01fcdc7fb1 r12 0xffffffff8297f9b8 cpu_info_full_primary+0x29b8 r13 0 r14 0 r15 0x1 rip 0xffffffff816ef6f8 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800029612450 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{0}> show proc PROC (syz-executor.3) pid=346937 stat=onproc flags process=1800 proc=4080080 pri=79, usrpri=79, nice=20 forw=0xffffffffffffffff, list=0xffff800021258a80,0xffff8000fffef518 process=0xffff80002e4c7200 user=0xffff80002960d000, vmspace=0xfffffd8065f69b98 estcpu=29, cpticks=0, pctcpu=0.0 user=0, sys=0, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 76316 500671 10503 0 2 0 syz-executor.0 26414 202607 31496 0 2 0 syz-executor.6 1495 228186 58668 0 7 0 syz-executor.7 1495 371673 58668 0 3 0x4000080 fsleep syz-executor.7 1495 101468 58668 0 3 0x4000080 fsleep syz-executor.7 13511 116072 10403 0 2 0 syz-executor.4 13511 29095 10403 0 3 0x4000080 fsleep syz-executor.4 13511 363572 10403 0 2 0x4000000 syz-executor.4 77930 113480 68632 0 2 0 syz-executor.2 77930 50493 68632 0 3 0x4000080 fsleep syz-executor.2 30207 275979 50755 0 2 0 syz-executor.5 30207 353427 50755 0 2 0x4000000 syz-executor.5 32786 336824 68539 0 2 0x3800 syz-executor.3 *32786 346937 68539 0 7 0x4081880 syz-executor.3 96281 18545 0 0 3 0x14200 bored sosplice 50755 343177 65206 0 3 0x82 nanoslp syz-executor.5 44253 362231 0 0 3 0x14280 nfsidl nfsio 51507 385953 0 0 3 0x14280 nfsidl nfsio 94136 255567 0 0 3 0x14280 nfsidl nfsio 21744 104038 0 0 3 0x14280 nfsidl nfsio 34321 368328 0 0 3 0x14280 nfsidl nfsio 44779 266074 0 0 3 0x14280 nfsidl nfsio 44921 493626 0 0 3 0x14280 nfsidl nfsio 38245 450575 0 0 3 0x14280 nfsidl nfsio 3454 14156 0 0 3 0x14280 nfsidl nfsio 49037 10266 0 0 3 0x14280 nfsidl nfsio 70937 237288 0 0 3 0x14280 nfsidl nfsio 31553 4994 0 0 3 0x14280 nfsidl nfsio 38425 479334 0 0 3 0x14280 nfsidl nfsio 24678 20666 0 0 3 0x14280 nfsidl nfsio 37183 360670 0 0 3 0x14280 nfsidl nfsio 96100 421022 0 0 3 0x14280 nfsidl nfsio 31911 426906 0 0 3 0x14280 nfsidl nfsio 66760 456856 0 0 3 0x14280 nfsidl nfsio 52700 521534 0 0 3 0x14280 nfsidl nfsio 78470 206021 0 0 3 0x14280 nfsidl nfsio 58668 229794 65206 0 2 0x2 syz-executor.7 31496 13984 65206 0 3 0x82 nanoslp syz-executor.6 10403 187267 65206 0 2 0x2 syz-executor.4 68539 13118 65206 0 3 0x82 nanoslp syz-executor.3 68632 476166 65206 0 3 0x82 nanoslp syz-executor.2 11024 51842 65206 0 3 0x82 nanoslp syz-executor.1 10503 86060 65206 0 3 0x82 nanoslp syz-executor.0 65206 470230 71621 0 3 0x82 thrsleep syz-fuzzer 65206 320007 71621 0 3 0x4000082 thrsleep syz-fuzzer 65206 283132 71621 0 3 0x4000082 thrsleep syz-fuzzer 65206 225186 71621 0 3 0x4000082 thrsleep syz-fuzzer 65206 489754 71621 0 3 0x4000082 thrsleep syz-fuzzer 65206 141169 71621 0 3 0x4000082 thrsleep syz-fuzzer 65206 324688 71621 0 3 0x4000082 thrsleep syz-fuzzer 65206 293517 71621 0 3 0x4000082 kqread syz-fuzzer 65206 518193 71621 0 3 0x4000082 thrsleep syz-fuzzer 65206 504234 71621 0 3 0x4000082 thrsleep syz-fuzzer 71621 332472 68287 0 3 0x10008a sigsusp ksh 68287 165659 50922 0 3 0x9a kqread sshd 83708 382012 1 0 3 0x100083 ttyin getty 50922 124571 1 0 3 0x88 kqread sshd 82079 271345 68131 74 3 0x1100092 bpf pflogd 68131 56855 1 0 3 0x80 netio pflogd 46872 6253 81916 73 3 0x1100090 kqread syslogd 81916 285923 1 0 3 0x100082 netio syslogd 54245 292849 1 0 3 0x100080 kqread resolvd 75575 33801 75260 77 3 0x100092 kqread dhcpleased 3417 119811 75260 77 3 0x100092 kqread dhcpleased 75260 143068 1 0 3 0x80 kqread dhcpleased 57220 465680 0 0 3 0x14200 bored smr 60971 106807 0 0 2 0x14200 zerothread 40638 243574 0 0 3 0x14200 aiodoned aiodoned 67741 497925 0 0 3 0x14200 syncer update 90184 439393 0 0 3 0x14200 cleaner cleaner 79764 254672 0 0 3 0x14200 reaper reaper 64243 44734 0 0 3 0x14200 pgdaemon pagedaemon 3572 310089 0 0 3 0x14200 bored viomb 34885 291975 0 0 3 0x40014200 acpi0 acpi0 43198 395730 0 0 3 0x40014200 idle1 61478 217274 0 0 3 0x14200 bored softnet 765 280876 0 0 3 0x14200 bored softnet 13820 203877 0 0 3 0x14200 bored softnet 75957 311593 0 0 3 0x14200 bored softnet 58602 419935 0 0 3 0x14200 bored systqmp 13142 279425 0 0 3 0x14200 bored systq 91936 472447 0 0 3 0x40014200 bored softclock 53828 490897 0 0 3 0x40014200 idle0 1 155209 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks CPU 0: exclusive sched_lock &sched_lock r = 0 (0xffffffff82a872c8) #0 witness_lock+0x44d #1 __mp_acquire_count+0x48 sys/kern/kern_lock.c:227 #2 mi_switch+0x3d4 sys/kern/sched_bsd.c:419 #3 single_thread_check_locked+0x17f sys/kern/kern_sig.c:2045 #4 single_thread_check+0x4b sys/kern/kern_sig.c:2057 #5 sleep_finish+0x75 sleep_signal_check sys/kern/kern_synch.c:464 [inline] #5 sleep_finish+0x75 sys/kern/kern_synch.c:400 #6 rwsleep+0xd5 sys/kern/kern_synch.c:314 #7 futex_wait+0x13c sys/kern/sys_futex.c:260 #8 sys_futex+0xf8 sys/kern/sys_futex.c:111 #9 syscall+0x484 mi_syscall sys/sys/syscall_mi.h:102 [inline] #9 syscall+0x484 sys/arch/amd64/amd64/trap.c:585 #10 Xsyscall+0x128 ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10184 6477K 6866K 78643K 12255 0 pcb 13 8K 8K 78643K 46 0 rtable 223 6K 7K 78643K 406 0 ifaddr 89 17K 18K 78643K 103 0 counters 56 35K 35K 78643K 58 0 ioctlops 0 0K 4K 78643K 1497 0 iov 0 0K 18K 78643K 324 0 mount 1 1K 1K 78643K 1 0 log 0 0K 0K 78643K 4 0 vnodes 1337 84K 84K 78643K 1454 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 5K 78643K 14 0 VM map 2 1K 1K 78643K 2 0 sem 7 0K 0K 78643K 7 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1697 195K 286K 78643K 12548 0 file desc 17 61K 93K 78643K 472 0 sigio 0 0K 0K 78643K 4 0 proc 69 91K 115K 78643K 560 0 subproc 104 6K 6K 78643K 117 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 ip_moptions 0 0K 0K 78643K 4 0 in_multi 94 6K 6K 78643K 122 0 ether_multi 1 0K 0K 78643K 4 0 ISOFS mount 1 32K 32K 78643K 1 0 MSDOSFS mount 1 16K 16K 78643K 1 0 ttys 49 228K 228K 78643K 49 0 exec 0 0K 2K 78643K 761 0 tdb 3 0K 0K 78643K 3 0 pagedep 1 8K 8K 78643K 1 0 inodedep 1 32K 32K 78643K 1 0 newblk 1 0K 0K 78643K 1 0 VM swap 7 26K 26K 78643K 7 0 UVM amap 223 78K 87K 78643K 4587 0 UVM aobj 45 2K 2K 78643K 57 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 0K 78643K 6 0 NDP 13 0K 1K 78643K 33 0 temp 136 4722K 4787K 78643K 7855 0 kqueue 12 18K 20K 78643K 33 0 SYN cache 2 16K 16K 78643K 2 0 ddb{0}> show all pools Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle plcache 128 22 0 0 1 0 1 1 0 8 0 rtpcb 120 40 0 37 1 0 1 1 0 8 0 rtentry 112 126 0 23 4 0 4 4 0 8 0 unpcb 136 500 0 483 6 0 6 6 0 8 5 syncache 296 4 0 4 1 1 0 1 0 8 0 tcpqe 32 50 0 50 1 1 0 1 0 8 0 tcpcb 736 33 0 29 1 0 1 1 0 8 0 arp 120 20 0 4 1 0 1 1 0 8 0 inpcb 320 277 0 270 4 0 4 4 0 8 3 nd6 48 28 0 6 1 0 1 1 0 8 0 pkpcb 40 3 0 3 1 1 0 1 0 8 0 kcovpl 48 9 0 1 1 0 1 1 0 8 0 pffrag 232 2 0 1 1 0 1 1 0 482 0 pffrnode 88 2 0 1 1 0 1 1 0 8 0 pffrent 40 42 0 41 2 1 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 29 0 2 1 0 1 1 0 8 0 pfstkey 120 29 0 2 1 0 1 1 0 8 0 pfstate 336 29 0 2 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 256 538 0 88 29 0 29 29 0 8 0 art_table 32 539 0 88 4 0 4 4 0 8 0 art_node 16 125 0 31 1 0 1 1 0 8 0 sysvmsgpl 40 2 0 0 1 0 1 1 0 8 0 semapl 112 5 0 0 1 0 1 1 0 8 0 shmpl 112 54 0 12 2 0 2 2 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 1907 0 462 91 0 91 91 0 8 0 ffsino 272 1907 0 462 97 0 97 97 0 8 0 nchpl 144 2654 0 1005 63 0 63 63 0 8 0 uvmvnodes 80 2181 0 0 45 0 45 45 0 8 0 vnodes 224 2181 0 0 129 0 129 129 0 8 0 namei 1024 9883 0 9883 2 1 1 2 0 8 1 percpumem 16 41 0 1 1 0 1 1 0 8 0 kstatmem 264 28 0 2 2 0 2 2 0 8 0 scxspl 216 8635 0 8635 11 8 3 8 0 8 3 plimitpl 152 44 0 28 1 0 1 1 0 8 0 sigapl 424 808 0 739 10 2 8 8 0 8 0 futexpl 64 3490 0 3485 1 0 1 1 0 8 0 knotepl 120 156 0 0 5 0 5 5 0 8 0 kqueuepl 224 37 0 29 1 0 1 1 0 8 0 pipepl 336 164 0 136 3 0 3 3 0 8 0 fdescpl 496 770 0 740 5 1 4 5 0 8 0 filepl 152 3764 0 3521 17 1 16 16 0 8 6 lockfpl 104 43 0 41 1 0 1 1 0 8 0 lockfspl 48 21 0 19 1 0 1 1 0 8 0 sessionpl 144 25 0 8 1 0 1 1 0 8 0 pgrppl 48 28 0 11 1 0 1 1 0 8 0 ucredpl 104 195 0 183 1 0 1 1 0 8 0 zombiepl 144 740 0 739 1 0 1 1 0 8 0 processpl 1064 808 0 739 5 0 5 5 0 8 0 procpl 672 1564 0 1479 9 1 8 8 0 8 0 srpgc 96 2 0 2 1 0 1 1 0 8 1 sosppl 168 5 0 5 1 0 1 1 0 8 1 sockpl 480 820 0 793 24 12 12 20 0 8 8 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 6 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 6 0 0 1 0 1 1 0 8 0 mcl2k2 2112 1 0 0 1 0 1 1 0 8 0 mcl2k 2048 176 0 0 21 0 21 21 0 8 0 mtagpl 96 64 0 0 2 0 2 2 0 8 0 mbufpl 256 377 0 0 24 0 24 24 0 8 0 bufpl 288 4566 0 149 316 0 316 316 0 8 0 anonpl 24 261525 0 241023 181 6 175 175 0 186 48 amapchunkpl 152 12477 0 11782 39 7 32 35 0 158 2 amappl16 200 8764 0 8030 125 60 65 65 0 8 26 amappl15 192 87 0 83 1 0 1 1 0 8 0 amappl14 184 108 0 105 1 0 1 1 0 8 0 amappl13 176 131 0 129 1 0 1 1 0 8 0 amappl12 168 6 0 4 1 0 1 1 0 8 0 amappl11 160 148 0 124 2 0 2 2 0 8 0 amappl10 152 58 0 48 1 0 1 1 0 8 0 amappl9 144 585 0 577 1 0 1 1 0 8 0 amappl8 136 621 0 583 2 0 2 2 0 8 0 amappl7 128 150 0 138 1 0 1 1 0 8 0 amappl6 120 305 0 287 2 1 1 2 0 8 0 amappl5 112 350 0 332 1 0 1 1 0 8 0 amappl4 104 996 0 969 2 0 2 2 0 8 0 amappl3 96 1604 0 1555 2 0 2 2 0 8 0 amappl2 88 1106 0 1046 3 1 2 3 0 8 0 amappl1 80 20228 0 19577 20 5 15 20 0 8 0 amappl 88 4109 0 3947 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 56 0 12 1 0 1 1 0 8 0 uaddrrnd 24 770 0 740 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 770 0 740 1 0 1 1 0 8 0 vmmpekpl 168 10822 0 10778 3 0 3 3 0 8 0 vmmpepl 168 84293 0 81541 154 7 147 147 0 357 25 vmsppl 368 769 0 740 5 2 3 4 0 8 0 rwobjpl 56 29424 0 25462 66 2 64 64 0 8 2 pdppl 4096 1547 0 1480 130 61 69 83 0 8 2 pvpl 32 519403 0 494449 292 16 276 276 0 265 72 pmappl 248 769 0 740 3 1 2 3 0 8 0 extentpl 40 58 0 38 1 0 1 1 0 8 0 phpool 112 735 0 67 20 0 20 20 0 8 0 ddb{0}> machine ddbcpu 0 Invalid cpu 0 ddb{0}> trace db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:437 panic(ffffffff825a0599) at panic+0x177 sys/kern/subr_prf.c:202 __assert(ffffffff82615d07,ffffffff825891d5,3f,ffffffff8264bc7b) at __assert+0x25 sys/kern/subr_prf.c:161 _kernel_lock() at _kernel_lock+0xb2 sys/kern/kern_lock.c:63 single_thread_check_locked(ffff8000fffef7a8,1,c) at single_thread_check_locked+0x1f6 sys/kern/kern_sig.c:2037 single_thread_check(ffff8000fffef7a8,1) at single_thread_check+0x4b sys/kern/kern_sig.c:2057 sleep_finish(ffff8000296126a0,1) at sleep_finish+0x75 sleep_signal_check sys/kern/kern_synch.c:464 [inline] sleep_finish(ffff8000296126a0,1) at sleep_finish+0x75 sys/kern/kern_synch.c:400 rwsleep(ffff8000fffef7a8,ffffffff829990c0,120,ffffffff82599d73,0) at rwsleep+0xd5 sys/kern/kern_synch.c:314 futex_wait(f67c296b3a0,2,0,2) at futex_wait+0x13c sys/kern/sys_futex.c:260 sys_futex(ffff8000fffef7a8,ffff800029612830,ffff800029612890) at sys_futex+0xf8 sys/kern/sys_futex.c:111 syscall(ffff800029612900) at syscall+0x484 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff800029612900) at syscall+0x484 sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xf686d957200, count: -12 ddb{0}> machine ddbcpu 1 Stopped at x86_ipi_db+0x1a: addq $0x8,%rsp x86_ipi_db(ffff800020dd8ff0) at x86_ipi_db+0x1a sys/arch/amd64/amd64/db_interface.c:393 x86_ipi_handler() at x86_ipi_handler+0xb7 sys/arch/amd64/amd64/ipi.c:106 Xresume_lapic_ipi() at Xresume_lapic_ipi+0x23 __mp_lock(ffffffff82a870c0) at __mp_lock+0x122 __mp_lock_spin sys/kern/kern_lock.c:116 [inline] __mp_lock(ffffffff82a870c0) at __mp_lock+0x122 sys/kern/kern_lock.c:147 preempt() at preempt+0x36 sys/kern/sched_bsd.c:307 ast(ffff80002e4413c0) at ast+0x108 mi_ast sys/sys/syscall_mi.h:184 [inline] ast(ffff80002e4413c0) at ast+0x108 sys/arch/amd64/amd64/trap.c:508 intr_user_exit() at intr_user_exit+0x3c end of kernel end trace frame: 0x7f7fffffb330, count: 8 ddb{1}> trace x86_ipi_db(ffff800020dd8ff0) at x86_ipi_db+0x1a sys/arch/amd64/amd64/db_interface.c:393 x86_ipi_handler() at x86_ipi_handler+0xb7 sys/arch/amd64/amd64/ipi.c:106 Xresume_lapic_ipi() at Xresume_lapic_ipi+0x23 __mp_lock(ffffffff82a870c0) at __mp_lock+0x122 __mp_lock_spin sys/kern/kern_lock.c:116 [inline] __mp_lock(ffffffff82a870c0) at __mp_lock+0x122 sys/kern/kern_lock.c:147 preempt() at preempt+0x36 sys/kern/sched_bsd.c:307 ast(ffff80002e4413c0) at ast+0x108 mi_ast sys/sys/syscall_mi.h:184 [inline] ast(ffff80002e4413c0) at ast+0x108 sys/arch/amd64/amd64/trap.c:508 intr_user_exit() at intr_user_exit+0x3c end of kernel end trace frame: 0x7f7fffffb330, count: -7