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 42840 45653 0 0 0 1 syz-executor.4 *481687 55594 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(ffff8000fffec000,1,c) at single_thread_check_locked+0x1f6 sys/kern/kern_sig.c:2037 single_thread_check(ffff8000fffec000,1) at single_thread_check+0x4b sys/kern/kern_sig.c:2057 sleep_finish(ffff80002e51f4b0,1) at sleep_finish+0x75 sleep_signal_check sys/kern/kern_synch.c:464 [inline] sleep_finish(ffff80002e51f4b0,1) at sleep_finish+0x75 sys/kern/kern_synch.c:400 rwsleep(ffff8000fffec000,ffffffff829990c0,120,ffffffff82599d73,0) at rwsleep+0xd5 sys/kern/kern_synch.c:314 futex_wait(9db40cdd2e0,6,0,2) at futex_wait+0x13c sys/kern/sys_futex.c:260 sys_futex(ffff8000fffec000,ffff80002e51f640,ffff80002e51f6a0) at sys_futex+0xf8 sys/kern/sys_futex.c:111 syscall(ffff80002e51f710) at syscall+0x484 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff80002e51f710) at syscall+0x484 sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x9db65984ce0, 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(ffff8000fffec000,1,c) at single_thread_check_locked+0x1f6 sys/kern/kern_sig.c:2037 single_thread_check(ffff8000fffec000,1) at single_thread_check+0x4b sys/kern/kern_sig.c:2057 sleep_finish(ffff80002e51f4b0,1) at sleep_finish+0x75 sleep_signal_check sys/kern/kern_synch.c:464 [inline] sleep_finish(ffff80002e51f4b0,1) at sleep_finish+0x75 sys/kern/kern_synch.c:400 rwsleep(ffff8000fffec000,ffffffff829990c0,120,ffffffff82599d73,0) at rwsleep+0xd5 sys/kern/kern_synch.c:314 futex_wait(9db40cdd2e0,6,0,2) at futex_wait+0x13c sys/kern/sys_futex.c:260 sys_futex(ffff8000fffec000,ffff80002e51f640,ffff80002e51f6a0) at sys_futex+0xf8 sys/kern/sys_futex.c:111 syscall(ffff80002e51f710) at syscall+0x484 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff80002e51f710) at syscall+0x484 sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x9db65984ce0, count: -12 ddb{0}> show registers rdi 0 rsi 0x1 rbp 0xffff80002e51f270 rbx 0xffffffff8297fbb7 cpu_info_full_primary+0x2bb7 rdx 0 rcx 0 rax 0xffff8000fffec000 r8 0x101010101010101 r9 0x8080808080808080 r10 0xadf027f5418f7a13 r11 0x656be17cefa824a r12 0xffffffff8297f9b8 cpu_info_full_primary+0x29b8 r13 0 r14 0 r15 0x1 rip 0xffffffff816ef6f8 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff80002e51f260 ss 0 db_enter+0x18: addq $0x8,%rsp ddb{0}> show proc PROC (syz-executor.3) pid=481687 stat=onproc flags process=1800 proc=4080080 pri=80, usrpri=80, nice=20 forw=0xffffffffffffffff, list=0xffff8000fffed7a0,0xffff8000ffff6020 process=0xffff8000fffeb620 user=0xffff80002e51a000, vmspace=0xfffffd80648ff8b8 estcpu=36, cpticks=1, pctcpu=0.0 user=0, sys=0, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 45653 42840 22716 0 7 0 syz-executor.4 45653 56182 22716 0 3 0x4000080 fsleep syz-executor.4 55594 129774 34606 0 2 0x3800 syz-executor.3 *55594 481687 34606 0 7 0x4081880 syz-executor.3 29043 485842 20973 0 2 0 syz-executor.5 29043 140391 20973 0 3 0x4000080 fsleep syz-executor.5 29043 405264 20973 0 3 0x4000080 fsleep syz-executor.5 29043 100372 20973 0 3 0x4000080 fsleep syz-executor.5 62822 88435 12528 0 2 0 syz-executor.6 62822 462778 12528 0 3 0x4000080 fsleep syz-executor.6 62822 330717 12528 0 3 0x4000080 fsleep syz-executor.6 11066 25939 56525 0 2 0 syz-executor.1 11066 511661 56525 0 2 0x4000000 syz-executor.1 73828 142658 64676 0 2 0 syz-executor.7 73828 429849 64676 0 3 0x4000080 fsleep syz-executor.7 35839 113346 0 0 3 0x14200 acct acct 81218 120079 0 0 3 0x14280 nfsidl nfsio 86392 394211 0 0 3 0x14280 nfsidl nfsio 60512 24067 0 0 3 0x14280 nfsidl nfsio 30011 55748 0 0 3 0x14280 nfsidl nfsio 36346 465063 0 0 3 0x14280 nfsidl nfsio 32688 460809 0 0 3 0x14280 nfsidl nfsio 23841 43387 0 0 3 0x14280 nfsidl nfsio 67373 10721 0 0 3 0x14280 nfsidl nfsio 70668 405791 0 0 3 0x14280 nfsidl nfsio 71330 360318 0 0 3 0x14280 nfsidl nfsio 62294 367002 0 0 3 0x14280 nfsidl nfsio 19238 257640 0 0 3 0x14280 nfsidl nfsio 91112 87149 0 0 3 0x14280 nfsidl nfsio 96476 91755 0 0 3 0x14280 nfsidl nfsio 96386 361336 0 0 3 0x14280 nfsidl nfsio 44212 193792 0 0 3 0x14280 nfsidl nfsio 26055 123361 0 0 3 0x14280 nfsidl nfsio 74317 166352 0 0 3 0x14280 nfsidl nfsio 54047 222081 0 0 3 0x14280 nfsidl nfsio 19002 6720 0 0 3 0x14280 nfsidl nfsio 64676 346483 37522 0 3 0x82 nanoslp syz-executor.7 12528 333552 37522 0 2 0x2 syz-executor.6 20973 327202 37522 0 3 0x82 nanoslp syz-executor.5 34606 154981 37522 0 3 0x82 nanoslp syz-executor.3 22716 233286 37522 0 3 0x82 nanoslp syz-executor.4 56511 371050 37522 0 2 0x2 syz-executor.2 56525 507775 37522 0 3 0x82 nanoslp syz-executor.1 77687 412170 37522 0 3 0x82 nanoslp syz-executor.0 37522 224568 67821 0 3 0x82 thrsleep syz-fuzzer 37522 266072 67821 0 3 0x4000082 thrsleep syz-fuzzer 37522 144847 67821 0 3 0x4000082 thrsleep syz-fuzzer 37522 390021 67821 0 3 0x4000082 thrsleep syz-fuzzer 37522 43485 67821 0 3 0x4000082 thrsleep syz-fuzzer 37522 237766 67821 0 3 0x4000082 kqread syz-fuzzer 37522 202424 67821 0 3 0x4000082 thrsleep syz-fuzzer 37522 217340 67821 0 3 0x4000082 thrsleep syz-fuzzer 37522 39132 67821 0 3 0x4000082 thrsleep syz-fuzzer 67821 313439 36112 0 3 0x10008a sigsusp ksh 36112 83121 7367 0 3 0x9a kqread sshd 83969 498504 1 0 3 0x100083 ttyin getty 7367 225815 1 0 3 0x88 kqread sshd 13421 79936 78095 74 3 0x1100092 bpf pflogd 78095 88329 1 0 3 0x80 netio pflogd 94301 456512 55111 73 3 0x1100090 kqread syslogd 55111 367106 1 0 3 0x100082 netio syslogd 154 381950 1 0 3 0x100080 kqread resolvd 56165 91685 5267 77 3 0x100092 kqread dhcpleased 33171 482784 5267 77 3 0x100092 kqread dhcpleased 5267 44253 1 0 3 0x80 kqread dhcpleased 18503 355515 0 0 3 0x14200 bored smr 32814 294531 0 0 2 0x14200 zerothread 80517 309917 0 0 3 0x14200 aiodoned aiodoned 45974 130555 0 0 3 0x14200 syncer update 60508 67235 0 0 3 0x14200 cleaner cleaner 37686 461126 0 0 3 0x14200 reaper reaper 11832 115472 0 0 3 0x14200 pgdaemon pagedaemon 98868 507709 0 0 3 0x14200 bored viomb 53463 358726 0 0 3 0x40014200 acpi0 acpi0 30218 436183 0 0 3 0x40014200 idle1 63706 134 0 0 3 0x14200 bored softnet 14981 130739 0 0 3 0x14200 bored softnet 79441 129034 0 0 3 0x14200 bored softnet 10468 320643 0 0 3 0x14200 bored softnet 18706 256129 0 0 3 0x14200 bored systqmp 96019 362017 0 0 3 0x14200 bored systq 63264 475120 0 0 3 0x40014200 bored softclock 77679 304535 0 0 3 0x40014200 idle0 1 487515 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 Process 45653 (syz-executor.4) thread 0xffff8000fffeda40 (42840) shared rwlock vmmaplk r = 0 (0xfffffd80648ff1a0) #0 witness_lock+0x44d #1 uvm_map_inentry_fix+0xa7 vm_map_lock_read_ln sys/uvm/uvm_map.c:5479 [inline] #1 uvm_map_inentry_fix+0xa7 sys/uvm/uvm_map.c:1886 #2 uvm_map_inentry+0xca sys/uvm/uvm_map.c:1917 #3 syscall+0x3ca mi_syscall sys/sys/syscall_mi.h:87 [inline] #3 syscall+0x3ca sys/arch/amd64/amd64/trap.c:585 #4 Xsyscall+0x128 ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10180 6474K 6798K 78643K 11564 0 pcb 15 8K 8K 78643K 30 0 rtable 241 8K 11K 78643K 397 0 ifaddr 87 17K 18K 78643K 107 0 counters 56 35K 35K 78643K 56 0 ioctlops 0 0K 8K 78643K 2014 0 iov 0 0K 16K 78643K 257 0 mount 1 1K 1K 78643K 1 0 log 0 0K 0K 78643K 4 0 vnodes 1275 80K 80K 78643K 1333 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 5K 78643K 6 0 VM map 2 1K 1K 78643K 2 0 sem 9 0K 0K 78643K 9 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1697 195K 286K 78643K 12548 0 file desc 16 57K 97K 78643K 372 0 proc 69 91K 128K 78643K 508 0 subproc 104 6K 6K 78643K 104 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 ip_moptions 0 0K 0K 78643K 7 0 in_multi 99 6K 6K 78643K 115 0 ether_multi 1 0K 0K 78643K 1 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 742 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 290 418K 418K 78643K 3908 0 UVM aobj 3 2K 2K 78643K 3 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 0K 78643K 2 0 NDP 12 0K 2K 78643K 32 0 temp 89 4710K 4774K 78643K 4361 0 kqueue 12 18K 22K 78643K 37 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 35 0 32 1 0 1 1 0 8 0 rtentry 112 115 0 5 4 0 4 4 0 8 0 unpcb 136 81 0 64 1 0 1 1 0 8 0 syncache 296 4 0 4 1 1 0 1 0 8 0 tcpcb 736 67 0 57 4 0 4 4 0 8 1 arp 120 18 0 0 1 0 1 1 0 8 0 inpcb 320 230 0 221 7 0 7 7 0 8 6 nd6 48 28 0 4 1 0 1 1 0 8 0 kcovpl 48 8 0 0 1 0 1 1 0 8 0 pfstscr 40 2 0 2 1 0 1 1 0 8 1 pffrent 40 3 0 3 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 pfrktable 1344 18 0 15 1 0 1 1 0 8 0 pfstitem 24 21 0 2 1 0 1 1 0 8 0 pfstkey 120 25 0 6 1 0 1 1 0 8 0 pfstate 336 23 0 4 2 0 2 2 0 8 0 pfrule 1360 35 0 26 2 1 1 2 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 452 0 0 29 0 29 29 0 8 0 art_table 32 453 0 0 4 0 4 4 0 8 0 art_node 16 114 0 14 1 0 1 1 0 8 0 semupl 112 3 0 2 1 0 1 1 0 8 0 semapl 112 7 0 0 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 1776 0 333 91 0 91 91 0 8 0 ffsino 272 1776 0 333 97 0 97 97 0 8 0 nchpl 144 2379 0 694 63 0 63 63 0 8 0 uvmvnodes 80 1934 0 0 40 0 40 40 0 8 0 vnodes 224 1934 0 0 114 0 114 114 0 8 0 namei 1024 8262 0 8262 2 1 1 2 0 8 1 percpumem 16 40 0 0 1 0 1 1 0 8 0 vcpupl 2048 95 0 0 12 0 12 12 0 8 0 vmpool 560 95 0 0 7 0 7 7 0 8 0 pfiaddrpl 120 6 0 4 1 0 1 1 0 8 0 kstatmem 264 24 0 0 2 0 2 2 0 8 0 scxspl 216 7429 0 7429 9 1 8 8 0 8 8 plimitpl 152 77 0 60 1 0 1 1 0 8 0 sigapl 424 703 0 635 9 1 8 8 0 8 0 futexpl 64 2311 0 2303 1 0 1 1 0 8 0 knotepl 120 112 0 0 5 1 4 4 0 8 0 kqueuepl 224 75 0 67 1 0 1 1 0 8 0 pipepl 336 170 0 142 3 0 3 3 0 8 0 fdescpl 496 665 0 636 5 0 5 5 0 8 0 filepl 152 2996 0 2752 14 0 14 14 0 8 4 lockfpl 104 49 0 46 1 0 1 1 0 8 0 lockfspl 48 18 0 15 1 0 1 1 0 8 0 sessionpl 144 24 0 7 1 0 1 1 0 8 0 pgrppl 48 24 0 7 1 0 1 1 0 8 0 ucredpl 104 155 0 143 1 0 1 1 0 8 0 zombiepl 144 636 0 635 1 0 1 1 0 8 0 processpl 1064 703 0 635 5 0 5 5 0 8 0 procpl 672 1217 0 1132 10 1 9 9 0 8 1 sockpl 480 346 0 317 12 0 12 12 0 8 7 mcl64k 65536 6 0 0 1 0 1 1 0 8 0 mcl16k 16384 6 0 0 1 0 1 1 0 8 0 mcl12k 12288 5 0 0 1 0 1 1 0 8 0 mcl9k 9216 2 0 0 1 0 1 1 0 8 0 mcl8k 8192 6 0 0 1 0 1 1 0 8 0 mcl4k 4096 6 0 0 1 0 1 1 0 8 0 mcl2k 2048 172 0 0 20 0 20 20 0 8 0 mtagpl 96 68 0 0 2 0 2 2 0 8 0 mbufpl 256 325 0 0 20 0 20 20 0 8 0 bufpl 288 4142 0 147 286 0 286 286 0 8 0 anonpl 24 110285 0 94033 102 2 100 100 0 186 0 amapchunkpl 152 9566 0 8871 34 5 29 31 0 158 2 amappl16 200 1349 0 842 27 0 27 27 0 8 0 amappl15 192 45 0 42 2 1 1 1 0 8 0 amappl14 184 10 0 8 1 0 1 1 0 8 0 amappl13 176 126 0 124 1 0 1 1 0 8 0 amappl12 168 71 0 63 1 0 1 1 0 8 0 amappl11 160 87 0 66 1 0 1 1 0 8 0 amappl10 152 130 0 121 1 0 1 1 0 8 0 amappl9 144 540 0 530 1 0 1 1 0 8 0 amappl8 136 559 0 519 2 0 2 2 0 8 0 amappl7 128 105 0 95 1 0 1 1 0 8 0 amappl6 120 253 0 233 2 1 1 2 0 8 0 amappl5 112 408 0 388 1 0 1 1 0 8 0 amappl4 104 846 0 822 2 1 1 2 0 8 0 amappl3 96 1360 0 1307 2 0 2 2 0 8 0 amappl2 88 974 0 914 3 1 2 3 0 8 0 amappl1 80 17580 0 16916 20 5 15 20 0 8 0 amappl 88 3411 0 3225 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 2 0 0 1 0 1 1 0 8 0 uaddrrnd 24 760 0 636 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 760 0 636 1 0 1 1 0 8 0 vmmpekpl 168 10021 0 9963 3 0 3 3 0 8 0 vmmpepl 168 67001 0 64321 127 3 124 124 0 357 2 vmsppl 368 759 0 636 12 0 12 12 0 8 0 rwobjpl 56 19239 0 15757 50 0 50 50 0 8 0 pdppl 4096 1527 0 1367 219 56 163 163 0 8 3 pvpl 32 338729 0 317991 242 11 231 242 0 265 61 pmappl 248 759 0 636 8 0 8 8 0 8 0 extentpl 40 58 0 38 1 0 1 1 0 8 0 phpool 112 810 0 60 22 0 22 22 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(ffff8000fffec000,1,c) at single_thread_check_locked+0x1f6 sys/kern/kern_sig.c:2037 single_thread_check(ffff8000fffec000,1) at single_thread_check+0x4b sys/kern/kern_sig.c:2057 sleep_finish(ffff80002e51f4b0,1) at sleep_finish+0x75 sleep_signal_check sys/kern/kern_synch.c:464 [inline] sleep_finish(ffff80002e51f4b0,1) at sleep_finish+0x75 sys/kern/kern_synch.c:400 rwsleep(ffff8000fffec000,ffffffff829990c0,120,ffffffff82599d73,0) at rwsleep+0xd5 sys/kern/kern_synch.c:314 futex_wait(9db40cdd2e0,6,0,2) at futex_wait+0x13c sys/kern/sys_futex.c:260 sys_futex(ffff8000fffec000,ffff80002e51f640,ffff80002e51f6a0) at sys_futex+0xf8 sys/kern/sys_futex.c:111 syscall(ffff80002e51f710) at syscall+0x484 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff80002e51f710) at syscall+0x484 sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x9db65984ce0, 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 wakeup_n(ffff8000ffff6010,1) at wakeup_n+0x37 futex_requeue(3420a471b00,1,0,0,2) at futex_requeue+0x110 sys/kern/sys_futex.c:306 sys_futex(ffff8000fffeda40,ffff80002c816980,ffff80002c8169e0) at sys_futex+0x115 sys/kern/sys_futex.c:115 syscall(ffff80002c816a50) at syscall+0x484 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff80002c816a50) at syscall+0x484 sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7f7ffffefa60, count: 6 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 wakeup_n(ffff8000ffff6010,1) at wakeup_n+0x37 futex_requeue(3420a471b00,1,0,0,2) at futex_requeue+0x110 sys/kern/sys_futex.c:306 sys_futex(ffff8000fffeda40,ffff80002c816980,ffff80002c8169e0) at sys_futex+0x115 sys/kern/sys_futex.c:115 syscall(ffff80002c816a50) at syscall+0x484 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff80002c816a50) at syscall+0x484 sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7f7ffffefa60, count: -9