Wpanic: 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 474023 14488 0 0 0 1 syz-executor.5 *334030 63383 0 0x1800 0x4080080 0 syz-executor.2 db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:437 panic(ffffffff8259a0ff) at panic+0x177 sys/kern/subr_prf.c:202 __assert(ffffffff82613e2d,ffffffff8258219f,3f,ffffffff826493d4) 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(ffff800021302fc0,1,c) at single_thread_check_locked+0x1f6 sys/kern/kern_sig.c:2037 single_thread_check(ffff800021302fc0,1) at single_thread_check+0x4b sys/kern/kern_sig.c:2057 sleep_finish(ffff80002864a230,1) at sleep_finish+0x75 sleep_signal_check sys/kern/kern_synch.c:464 [inline] sleep_finish(ffff80002864a230,1) at sleep_finish+0x75 sys/kern/kern_synch.c:400 rwsleep(ffff800021302fc0,ffffffff829a5750,120,ffffffff82596a6a,0) at rwsleep+0xd5 sys/kern/kern_synch.c:314 futex_wait(fe90dfbae30,4,0,2) at futex_wait+0x13c sys/kern/sys_futex.c:260 sys_futex(ffff800021302fc0,ffff80002864a3c0,ffff80002864a420) at sys_futex+0xf8 sys/kern/sys_futex.c:111 syscall(ffff80002864a490) at syscall+0x484 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff80002864a490) at syscall+0x484 sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xfe81e2b70b0, 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(ffffffff8259a0ff) at panic+0x177 sys/kern/subr_prf.c:202 __assert(ffffffff82613e2d,ffffffff8258219f,3f,ffffffff826493d4) 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(ffff800021302fc0,1,c) at single_thread_check_locked+0x1f6 sys/kern/kern_sig.c:2037 single_thread_check(ffff800021302fc0,1) at single_thread_check+0x4b sys/kern/kern_sig.c:2057 sleep_finish(ffff80002864a230,1) at sleep_finish+0x75 sleep_signal_check sys/kern/kern_synch.c:464 [inline] sleep_finish(ffff80002864a230,1) at sleep_finish+0x75 sys/kern/kern_synch.c:400 rwsleep(ffff800021302fc0,ffffffff829a5750,120,ffffffff82596a6a,0) at rwsleep+0xd5 sys/kern/kern_synch.c:314 futex_wait(fe90dfbae30,4,0,2) at futex_wait+0x13c sys/kern/sys_futex.c:260 sys_futex(ffff800021302fc0,ffff80002864a3c0,ffff80002864a420) at sys_futex+0xf8 sys/kern/sys_futex.c:111 syscall(ffff80002864a490) at syscall+0x484 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff80002864a490) at syscall+0x484 sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xfe81e2b70b0, count: -12 ddb{0}> show registers rdi 0 rsi 0x1 rbp 0xffff800028649ff0 rbx 0xffffffff82984bb7 cpu_info_full_primary+0x2bb7 rdx 0 rcx 0 rax 0xffff800021302fc0 r8 0x101010101010101 r9 0x8080808080808080 r10 0x1a462817d4817841 r11 0x5aea7035e58e2978 r12 0xffffffff829849b8 cpu_info_full_primary+0x29b8 r13 0 r14 0 r15 0x1 rip 0xffffffff81b52d88 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800028649fe0 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{0}> show proc PROC (syz-executor.2) pid=334030 stat=onproc flags process=1800 proc=4080080 pri=83, usrpri=83, nice=20 forw=0xffffffffffffffff, list=0xffff800021302000,0xffff80002b00e2b8 process=0xffff8000fffec440 user=0xffff800028645000, vmspace=0xfffffd806aa695d0 estcpu=33, cpticks=0, pctcpu=0.0 user=0, sys=0, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 85694 485623 13057 0 2 0 syz-executor.1 85694 195833 13057 0 3 0x4000080 fsleep syz-executor.1 14488 474023 21540 0 7 0 syz-executor.5 14488 339127 21540 0 3 0x4000080 fsleep syz-executor.5 83739 198025 7567 60929 2 0x10 syz-executor.0 83739 245660 7567 60929 3 0x4000090 fsleep syz-executor.0 63383 380112 8198 0 3 0x3800 suspend syz-executor.2 *63383 334030 8198 0 7 0x4081880 syz-executor.2 63383 484666 8198 0 2 0x4081880 syz-executor.2 63383 516826 8198 0 2 0x4081880 syz-executor.2 20080 273431 37361 0 2 0 syz-executor.7 8198 266825 21165 0 2 0x2 syz-executor.2 50137 288638 21165 0 2 0x2 syz-executor.6 21540 465316 21165 0 3 0x82 nanoslp syz-executor.5 37361 413970 21165 0 3 0x82 nanoslp syz-executor.7 13057 246540 21165 0 2 0x2 syz-executor.1 7567 275258 21165 0 3 0x82 nanoslp syz-executor.0 26089 295174 0 0 3 0x14200 bored sosplice 27756 318257 21165 0 2 0x2 syz-executor.4 56061 219585 21165 0 2 0x2 syz-executor.3 21165 294256 22508 0 3 0x82 thrsleep syz-fuzzer 21165 423487 22508 0 3 0x4000082 thrsleep syz-fuzzer 21165 215948 22508 0 3 0x4000082 thrsleep syz-fuzzer 21165 230889 22508 0 3 0x4000082 kqread syz-fuzzer 21165 160679 22508 0 3 0x4000082 thrsleep syz-fuzzer 21165 515193 22508 0 3 0x4000082 thrsleep syz-fuzzer 21165 451473 22508 0 3 0x4000082 thrsleep syz-fuzzer 21165 339643 22508 0 3 0x4000082 thrsleep syz-fuzzer 21165 439962 22508 0 3 0x4000082 thrsleep syz-fuzzer 22508 420752 65381 0 3 0x10008a sigsusp ksh 65381 351584 61728 0 3 0x9a kqread sshd 28756 107130 1 0 3 0x100083 ttyin getty 61728 513873 1 0 3 0x88 kqread sshd 39122 281280 90334 74 3 0x1100092 bpf pflogd 90334 100969 1 0 3 0x80 netio pflogd 19601 359560 48826 73 3 0x1100090 kqread syslogd 48826 355687 1 0 3 0x100082 netio syslogd 62369 324032 1 0 3 0x100080 kqread resolvd 70536 192784 6536 77 3 0x100092 kqread dhcpleased 78529 260350 6536 77 3 0x100092 kqread dhcpleased 6536 141112 1 0 3 0x80 kqread dhcpleased 15764 214763 0 0 3 0x14200 bored smr 8026 264862 0 0 2 0x14200 zerothread 80138 139605 0 0 3 0x14200 aiodoned aiodoned 24276 229099 0 0 3 0x14200 syncer update 28397 253903 0 0 3 0x14200 cleaner cleaner 203 374693 0 0 3 0x14200 reaper reaper 63550 129788 0 0 3 0x14200 pgdaemon pagedaemon 17097 414705 0 0 3 0x14200 bored viomb 33814 452859 0 0 3 0x40014200 acpi0 acpi0 95336 412548 0 0 3 0x40014200 idle1 93814 298030 0 0 3 0x14200 bored softnet 82141 18856 0 0 3 0x14200 bored softnet 71014 363167 0 0 3 0x14200 bored softnet 4949 97851 0 0 3 0x14200 bored softnet 32554 204202 0 0 3 0x14200 bored systqmp 92634 25106 0 0 3 0x14200 bored systq 7960 78386 0 0 3 0x40014200 bored softclock 88133 171681 0 0 3 0x40014200 idle0 1 417341 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 (0xffffffff82b703d8) #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 Process 14488 (syz-executor.5) thread 0xffff800021303a40 (474023) exclusive rwlock amaplk r = 0 (0xfffffd806a741550) #0 witness_lock+0x44d #1 uvm_fault_check+0x422 sys/uvm/uvm_fault.c:783 #2 uvm_fault+0xf2 sys/uvm/uvm_fault.c:601 #3 upageflttrap+0x82 sys/arch/amd64/amd64/trap.c:181 #4 usertrap+0x1aa sys/arch/amd64/amd64/trap.c:403 #5 recall_trap+0x8 shared rwlock vmmaplk r = 0 (0xfffffd806aa69198) #0 witness_lock+0x44d #1 uvmfault_lookup+0xd9 sys/uvm/uvm_fault.c:1771 #2 uvm_fault_check+0x3a sys/uvm/uvm_fault.c:673 #3 uvm_fault+0xf2 sys/uvm/uvm_fault.c:601 #4 upageflttrap+0x82 sys/arch/amd64/amd64/trap.c:181 #5 usertrap+0x1aa sys/arch/amd64/amd64/trap.c:403 #6 recall_trap+0x8 ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10193 6550K 6863K 78643K 15090 0 pcb 13 12K 14K 78643K 533 0 rtable 184 15K 16K 78643K 1292 0 ifaddr 87 17K 19K 78643K 408 0 sysctl 2 0K 0K 78643K 2 0 counters 56 35K 35K 78643K 124 0 ioctlops 0 0K 4K 78643K 1938 0 iov 0 0K 32K 78643K 350 0 mount 1 1K 1K 78643K 1 0 log 0 0K 0K 78643K 5 0 vnodes 1330 83K 84K 78643K 2710 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 5K 78643K 35 0 VM map 2 1K 1K 78643K 2 0 sem 11 1K 1K 78643K 11 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1697 195K 286K 78643K 12548 0 file desc 15 53K 89K 78643K 2518 0 sigio 0 0K 0K 78643K 185 0 proc 71 91K 128K 78643K 1016 0 subproc 104 6K 6K 78643K 299 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 ip_moptions 0 0K 0K 78643K 69 0 in_multi 78 5K 6K 78643K 292 0 ether_multi 1 0K 0K 78643K 4 0 mrt 0 0K 0K 78643K 3 0 ISOFS mount 1 32K 32K 78643K 1 0 MSDOSFS mount 1 16K 16K 78643K 1 0 ttys 67 307K 307K 78643K 67 0 exec 0 0K 2K 78643K 1345 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 295 242K 242K 78643K 16586 0 UVM aobj 120 3K 3K 78643K 129 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 0K 78643K 68 0 NDP 13 0K 1K 78643K 94 0 temp 260 4980K 5108K 78643K 30448 0 kqueue 13 20K 28K 78643K 200 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 120 297 0 294 4 3 1 3 0 8 0 rtentry 112 301 0 224 4 0 4 4 0 8 1 unpcb 136 735 0 720 5 4 1 3 0 8 0 syncache 296 16 0 16 4 3 1 1 0 8 1 tcpqe 32 543 0 543 4 4 0 2 0 8 0 tcpcb 736 576 0 569 20 18 2 7 0 8 1 arp 120 50 0 36 1 0 1 1 0 8 0 inpcb 320 1850 0 1841 23 16 7 7 0 8 6 nd6 48 70 0 52 1 0 1 1 0 8 0 pkpcb 40 7 0 7 1 0 1 1 0 8 1 kcovpl 48 23 0 15 1 0 1 1 0 8 0 ppxss 1256 13 0 13 4 4 0 1 0 8 0 pffrag 232 4 0 3 2 1 1 1 0 482 0 pffrnode 88 4 0 3 2 1 1 1 0 8 0 pffrent 40 80 0 79 3 2 1 1 0 8 0 pfosfp 40 1431 0 1006 5 0 5 5 0 8 0 pfosfpen 112 1431 0 715 21 0 21 21 0 8 0 pfrktable 1344 169 0 166 2 1 1 1 0 8 0 pftag 88 55 0 55 1 1 0 1 0 8 0 pfqueue 264 3 0 3 1 1 0 1 0 8 0 pfstitem 24 68 0 63 1 0 1 1 0 8 0 pfstkey 120 72 0 67 1 0 1 1 0 8 0 pfstate 336 72 0 67 4 2 2 3 0 8 0 pfrule 1360 94 0 81 3 1 2 2 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 1223 0 887 30 8 22 29 0 8 1 art_table 32 1224 0 887 4 0 4 4 0 8 0 art_node 16 292 0 225 1 0 1 1 0 8 0 sysvmsgpl 40 3 0 0 1 0 1 1 0 8 0 semupl 112 5 0 5 2 2 0 1 0 8 0 semapl 112 9 0 0 1 0 1 1 0 8 0 shmpl 112 126 0 9 4 0 4 4 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 4690 0 3243 91 0 91 91 0 8 0 ffsino 272 4690 0 3243 97 0 97 97 0 8 0 nchpl 144 7975 0 6323 63 0 63 63 0 8 0 uvmvnodes 80 5629 0 0 115 0 115 115 0 8 0 vnodes 224 5629 0 0 332 0 332 332 0 8 0 namei 1024 30343 0 30343 2 1 1 2 0 8 1 percpumem 16 74 0 34 1 0 1 1 0 8 0 vcpupl 2048 12 0 0 2 0 2 2 0 8 0 vmpool 560 12 0 0 1 0 1 1 0 8 0 pfiaddrpl 120 60 0 55 2 1 1 1 0 8 0 kstatmem 264 94 0 68 2 0 2 2 0 8 0 scsiplug 72 3 0 3 1 1 0 1 0 8 0 scxspl 216 26203 0 26203 15 12 3 8 0 8 3 plimitpl 152 453 0 436 1 0 1 1 0 8 0 sigapl 424 2815 0 2769 10 3 7 8 0 8 0 futexpl 64 19556 0 19550 2 1 1 1 0 8 0 knotepl 120 313 0 0 9 1 8 8 0 8 0 kqueuepl 224 421 0 412 5 4 1 3 0 8 0 pipepl 336 737 0 709 24 16 8 8 0 8 5 fdescpl 496 2777 0 2749 5 0 5 5 0 8 0 filepl 152 17362 0 17120 42 26 16 19 0 8 6 lockfpl 104 627 0 625 2 1 1 2 0 8 0 lockfspl 48 190 0 188 1 0 1 1 0 8 0 sessionpl 144 39 0 22 1 0 1 1 0 8 0 pgrppl 48 51 0 34 1 0 1 1 0 8 0 ucredpl 104 2652 0 2635 1 0 1 1 0 8 0 zombiepl 144 2769 0 2769 2 1 1 1 0 8 1 processpl 1064 2815 0 2769 5 0 5 5 0 8 0 procpl 672 7277 0 7217 11 4 7 8 0 8 0 srpgc 96 40 0 40 1 1 0 1 0 8 0 sosppl 168 27 0 27 6 5 1 1 0 8 1 sockpl 480 2891 0 2864 32 20 12 13 0 8 8 mcl64k 65536 17 0 0 3 0 3 3 0 8 0 mcl16k 16384 15 0 0 2 0 2 2 0 8 0 mcl12k 12288 17 0 0 2 0 2 2 0 8 0 mcl9k 9216 12 0 0 1 0 1 1 0 8 0 mcl8k 8192 16 0 0 2 0 2 2 0 8 0 mcl4k 4096 16 0 0 2 0 2 2 0 8 0 mcl2k2 2112 3 0 0 1 0 1 1 0 8 0 mcl2k 2048 275 0 0 34 0 34 34 0 8 1 mtagpl 96 242 0 0 6 0 6 6 0 8 0 mbufpl 256 1025 0 0 57 0 57 57 0 8 0 bufpl 288 7701 0 1372 453 0 453 453 0 8 0 anonpl 24 556755 0 538716 174 58 116 132 0 186 3 amapchunkpl 152 52998 0 52234 59 27 32 42 0 158 1 amappl16 200 8417 0 7871 70 32 38 44 0 8 8 amappl15 192 492 0 491 2 1 1 1 0 8 0 amappl14 184 476 0 473 1 0 1 1 0 8 0 amappl13 176 409 0 404 1 0 1 1 0 8 0 amappl12 168 147 0 145 1 0 1 1 0 8 0 amappl11 160 617 0 597 3 1 2 2 0 8 0 amappl10 152 249 0 242 1 0 1 1 0 8 0 amappl9 144 529 0 526 1 0 1 1 0 8 0 amappl8 136 1152 0 1086 3 0 3 3 0 8 0 amappl7 128 482 0 464 1 0 1 1 0 8 0 amappl6 120 329 0 310 2 1 1 2 0 8 0 amappl5 112 2189 0 2171 1 0 1 1 0 8 0 amappl4 104 1846 0 1814 2 0 2 2 0 8 0 amappl3 96 7762 0 7717 2 0 2 2 0 8 0 amappl2 88 3409 0 3348 3 0 3 3 0 8 0 amappl1 80 67666 0 67033 21 6 15 20 0 8 0 amappl 88 15819 0 15631 6 1 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 72 128 0 9 3 0 3 3 0 8 0 uaddrrnd 24 2789 0 2749 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 2789 0 2749 1 0 1 1 0 8 0 vmmpekpl 168 26948 0 26900 3 0 3 3 0 8 0 vmmpepl 168 280806 0 278310 179 48 131 131 0 357 9 vmsppl 368 2788 0 2749 4 0 4 4 0 8 0 rwobjpl 56 74997 0 67672 106 2 104 104 0 8 0 pdppl 4096 5585 0 5510 269 188 81 81 0 8 6 pvpl 32 1198026 0 1176125 359 165 194 243 0 265 10 pmappl 248 2788 0 2749 3 0 3 3 0 8 0 extentpl 40 58 0 38 1 0 1 1 0 8 0 phpool 112 1110 0 240 25 0 25 25 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(ffffffff8259a0ff) at panic+0x177 sys/kern/subr_prf.c:202 __assert(ffffffff82613e2d,ffffffff8258219f,3f,ffffffff826493d4) 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(ffff800021302fc0,1,c) at single_thread_check_locked+0x1f6 sys/kern/kern_sig.c:2037 single_thread_check(ffff800021302fc0,1) at single_thread_check+0x4b sys/kern/kern_sig.c:2057 sleep_finish(ffff80002864a230,1) at sleep_finish+0x75 sleep_signal_check sys/kern/kern_synch.c:464 [inline] sleep_finish(ffff80002864a230,1) at sleep_finish+0x75 sys/kern/kern_synch.c:400 rwsleep(ffff800021302fc0,ffffffff829a5750,120,ffffffff82596a6a,0) at rwsleep+0xd5 sys/kern/kern_synch.c:314 futex_wait(fe90dfbae30,4,0,2) at futex_wait+0x13c sys/kern/sys_futex.c:260 sys_futex(ffff800021302fc0,ffff80002864a3c0,ffff80002864a420) at sys_futex+0xf8 sys/kern/sys_futex.c:111 syscall(ffff80002864a490) at syscall+0x484 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff80002864a490) at syscall+0x484 sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xfe81e2b70b0, 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 __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x2f kd_curproc sys/dev/kcov.c:578 [inline] __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x2f sys/dev/kcov.c:148 __mp_lock(ffffffff82b701d0) at __mp_lock+0x133 __mp_lock_spin sys/kern/kern_lock.c:116 [inline] __mp_lock(ffffffff82b701d0) at __mp_lock+0x133 sys/kern/kern_lock.c:147 schedclock(ffff800021303a40) at schedclock+0x99 sys/kern/sched_bsd.c:507 hardclock(ffff80002863df00) at hardclock+0x1e0 sys/kern/kern_clock.c:169 lapic_clockintr(0,0) at lapic_clockintr+0x44 sys/arch/amd64/amd64/lapic.c:454 Xresume_lapic_ltimer() at Xresume_lapic_ltimer+0x26 x2apic_readreg(390) at x2apic_readreg+0x2a sys/arch/amd64/amd64/lapic.c:141 lapic_delay(1) at lapic_delay+0xb1 lapic_gettick sys/arch/amd64/amd64/lapic.c:400 [inline] lapic_delay(1) at lapic_delay+0xb1 sys/arch/amd64/amd64/lapic.c:623 comcnputc(800,57) at comcnputc+0x1d7 sys/dev/ic/com.c:1269 cnputc(57) at cnputc+0x4b sys/dev/cons.c:239 kputchar(57,5,0) at kputchar+0x1fe sys/kern/subr_prf.c:371 end trace frame: 0xffff80002863e220, count: 0 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 __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x2f kd_curproc sys/dev/kcov.c:578 [inline] __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x2f sys/dev/kcov.c:148 __mp_lock(ffffffff82b701d0) at __mp_lock+0x133 __mp_lock_spin sys/kern/kern_lock.c:116 [inline] __mp_lock(ffffffff82b701d0) at __mp_lock+0x133 sys/kern/kern_lock.c:147 schedclock(ffff800021303a40) at schedclock+0x99 sys/kern/sched_bsd.c:507 hardclock(ffff80002863df00) at hardclock+0x1e0 sys/kern/kern_clock.c:169 lapic_clockintr(0,0) at lapic_clockintr+0x44 sys/arch/amd64/amd64/lapic.c:454 Xresume_lapic_ltimer() at Xresume_lapic_ltimer+0x26 x2apic_readreg(390) at x2apic_readreg+0x2a sys/arch/amd64/amd64/lapic.c:141 lapic_delay(1) at lapic_delay+0xb1 lapic_gettick sys/arch/amd64/amd64/lapic.c:400 [inline] lapic_delay(1) at lapic_delay+0xb1 sys/arch/amd64/amd64/lapic.c:623 comcnputc(800,57) at comcnputc+0x1d7 sys/dev/ic/com.c:1269 cnputc(57) at cnputc+0x4b sys/dev/cons.c:239 kputchar(57,5,0) at kputchar+0x1fe sys/kern/subr_prf.c:371 kprintf() at kprintf+0x6ac sys/kern/subr_prf.c:728 printf(ffffffff828cc046) at printf+0x75 sys/kern/subr_prf.c:533 proc_trampoline() at proc_trampoline+0xdb end of kernel end trace frame: 0x7f7ffffc65c0, count: -17