panic: acquiring blockable sleep lock with spinlock or critical section held (rwlock) kmmaplk Stopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND 310612 45327 0 0x14000 0x200 1 reaper db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 panic(ffffffff823cd905) at panic+0x15e sys/kern/subr_prf.c:218 witness_checkorder(ffffffff828b37d8,1,0) at witness_checkorder+0x1146 sys/kern/subr_witness.c:833 rw_enter_read(ffffffff828b37c8) at rw_enter_read+0x66 sys/kern/kern_rwlock.c:111 uvmfault_lookup(ffff80002117f878,0) at uvmfault_lookup+0xd9 sys/uvm/uvm_fault.c:1534 uvm_fault_check(ffff80002117f878,ffff80002117f8b0,ffff80002117f840,2) at uvm_fault_check+0x3d sys/uvm/uvm_fault.c:511 uvm_fault(ffffffff828b37c0,ffff8000244c9000,0,2) at uvm_fault+0xcc sys/uvm/uvm_fault.c:935 kpageflttrap(ffff80002117fa20,ffff8000244c9fe8) at kpageflttrap+0x202 sys/arch/amd64/amd64/trap.c:265 kerntrap(ffff80002117fa20) at kerntrap+0xef sys/arch/amd64/amd64/trap.c:321 alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b memcpy() at memcpy+0x15 timeout_run(ffff800021283a80) at timeout_run+0xd6 timeout_sync_leave sys/kern/kern_timeout.c:207 [inline] timeout_run(ffff800021283a80) at timeout_run+0xd6 sys/kern/kern_timeout.c:676 softclock_process_tick_timeout(ffff800021283a80,0) at softclock_process_tick_timeout+0x196 sys/kern/kern_timeout.c:721 softclock(0) at softclock+0x11a sys/kern/kern_timeout.c:752 end trace frame: 0xffff80002117fc60, count: 0 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 acquiring blockable sleep lock with spinlock or critical section held (rwlock) kmmaplk ddb{0}> trace db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 panic(ffffffff823cd905) at panic+0x15e sys/kern/subr_prf.c:218 witness_checkorder(ffffffff828b37d8,1,0) at witness_checkorder+0x1146 sys/kern/subr_witness.c:833 rw_enter_read(ffffffff828b37c8) at rw_enter_read+0x66 sys/kern/kern_rwlock.c:111 uvmfault_lookup(ffff80002117f878,0) at uvmfault_lookup+0xd9 sys/uvm/uvm_fault.c:1534 uvm_fault_check(ffff80002117f878,ffff80002117f8b0,ffff80002117f840,2) at uvm_fault_check+0x3d sys/uvm/uvm_fault.c:511 uvm_fault(ffffffff828b37c0,ffff8000244c9000,0,2) at uvm_fault+0xcc sys/uvm/uvm_fault.c:935 kpageflttrap(ffff80002117fa20,ffff8000244c9fe8) at kpageflttrap+0x202 sys/arch/amd64/amd64/trap.c:265 kerntrap(ffff80002117fa20) at kerntrap+0xef sys/arch/amd64/amd64/trap.c:321 alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b memcpy() at memcpy+0x15 timeout_run(ffff800021283a80) at timeout_run+0xd6 timeout_sync_leave sys/kern/kern_timeout.c:207 [inline] timeout_run(ffff800021283a80) at timeout_run+0xd6 sys/kern/kern_timeout.c:676 softclock_process_tick_timeout(ffff800021283a80,0) at softclock_process_tick_timeout+0x196 sys/kern/kern_timeout.c:721 softclock(0) at softclock+0x11a sys/kern/kern_timeout.c:752 softintr_dispatch(0) at softintr_dispatch+0xfb sys/arch/amd64/amd64/softintr.c:90 Xsoftclock() at Xsoftclock+0x1f acpicpu_idle() at acpicpu_idle+0x2eb sys/dev/acpi/acpicpu.c:1206 sched_idle(ffffffff826f6ff0) at sched_idle+0x417 sys/kern/kern_sched.c:178 end trace frame: 0x0, count: -18 ddb{0}> show registers rdi 0 rsi 0x1 rbp 0xffff80002117f480 rbx 0xffff80002117f490 rdx 0x8b rcx 0x2 rax 0x1 r8 0xffffffff81808e36 kprintf+0x146 r9 0x1 r10 0x8f2a91a081ca4e71 r11 0x5c1872f2f3bde95c r12 0x3000000008 r13 0xffff80002117f530 r14 0x100 r15 0x1 rip 0xffffffff812e3d98 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff80002117f470 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{0}> show proc PROC (idle0) pid=230509 stat=onproc flags process=14000 proc=40000200 pri=0, usrpri=50, nice=20 forw=0x832765675d65c3cb, list=0xffff8000211799a0,0xffff800021178a50 process=0xffff8000ffffed60 user=0xffff80002117a000, vmspace=0xffffffff82935490 estcpu=0, cpticks=11923, pctcpu=0.0 user=0, sys=0, intr=1 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 4159 6145 76531 0 2 0x482 syz-executor.1 89102 415739 76531 0 3 0x82 nanosleep syz-executor.0 76531 405218 32905 0 3 0x82 thrsleep syz-fuzzer 76531 44986 32905 0 3 0x4000082 thrsleep syz-fuzzer 76531 109974 32905 0 3 0x4000082 thrsleep syz-fuzzer 76531 346098 32905 0 3 0x4000082 thrsleep syz-fuzzer 76531 167185 32905 0 3 0x4000082 thrsleep syz-fuzzer 76531 34094 32905 0 3 0x4000082 thrsleep syz-fuzzer 76531 100052 32905 0 3 0x4000082 kqread syz-fuzzer 76531 245670 32905 0 3 0x4000082 thrsleep syz-fuzzer 32905 369398 86169 0 3 0x10008a pause ksh 86169 88279 72885 0 3 0x92 select sshd 27063 280944 1 0 3 0x100083 ttyin getty 72885 515340 1 0 3 0x80 select sshd 58176 73524 54241 74 3 0x100092 bpf pflogd 54241 79400 1 0 3 0x80 netio pflogd 60060 444978 83553 73 3 0x100090 kqread syslogd 83553 59780 1 0 3 0x100082 netio syslogd 63761 487367 1 77 3 0x100090 poll dhclient 53346 173385 1 0 3 0x80 poll dhclient 67367 330822 0 0 3 0x14200 bored smr 34137 182149 0 0 2 0x14200 zerothread 87213 474735 0 0 3 0x14200 aiodoned aiodoned 61565 153977 0 0 3 0x14200 syncer update 52671 112656 0 0 3 0x14200 cleaner cleaner 45327 310612 0 0 7 0x14200 reaper 12576 75373 0 0 3 0x14200 pgdaemon pagedaemon 70443 398026 0 0 3 0x14200 bored crynlk 51623 20872 0 0 3 0x14200 bored crypto 2530 227802 0 0 3 0x14200 bored viomb 84093 513517 0 0 3 0x40014200 acpi0 acpi0 59766 377785 0 0 3 0x40014200 idle1 75577 203404 0 0 3 0x14200 bored softnet 95332 261838 0 0 3 0x14200 bored systqmp 61295 48482 0 0 3 0x14200 bored systq 12736 51565 0 0 3 0x40014200 bored softclock *45443 230509 0 0 7 0x40014200 idle0 1 105654 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks CPU 0: exclusive mutex /syzkaller/managers/multicore/kernel/sys/dev/kcov.c:125 r = 0 (0xffffffff8271ef30) #0 witness_lock+0x4b0 stacktrace_save sys/sys/stacktrace.h:36 [inline] #0 witness_lock+0x4b0 sys/kern/subr_witness.c:1176 #1 mtx_enter_try+0x100 #2 mtx_enter+0x4b sys/kern/kern_lock.c:266 #3 kcov_remote_leave+0x1f sys/dev/kcov.c:674 #4 timeout_run+0xd6 timeout_sync_leave sys/kern/kern_timeout.c:207 [inline] #4 timeout_run+0xd6 sys/kern/kern_timeout.c:676 #5 softclock_process_tick_timeout+0x196 sys/kern/kern_timeout.c:721 #6 softclock+0x11a sys/kern/kern_timeout.c:752 #7 softintr_dispatch+0xfb sys/arch/amd64/amd64/softintr.c:90 #8 Xsoftclock+0x1f #9 acpicpu_idle+0x2eb sys/dev/acpi/acpicpu.c:1206 #10 sched_idle+0x417 sys/kern/kern_sched.c:178 #11 proc_trampoline+0x1c shared mutex timeout r = 0 (0xffffffff82719570) #0 witness_lock+0x4b0 stacktrace_save sys/sys/stacktrace.h:36 [inline] #0 witness_lock+0x4b0 sys/kern/subr_witness.c:1176 #1 timeout_run+0xb7 sys/kern/kern_timeout.c:670 #2 softclock_process_tick_timeout+0x196 sys/kern/kern_timeout.c:721 #3 softclock+0x11a sys/kern/kern_timeout.c:752 #4 softintr_dispatch+0xfb sys/arch/amd64/amd64/softintr.c:90 #5 Xsoftclock+0x1f #6 acpicpu_idle+0x2eb sys/dev/acpi/acpicpu.c:1206 #7 sched_idle+0x417 sys/kern/kern_sched.c:178 #8 proc_trampoline+0x1c CPU 1: exclusive mutex pvpl r = 0 (0xffffffff82934380) #0 witness_lock+0x4b0 stacktrace_save sys/sys/stacktrace.h:36 [inline] #0 witness_lock+0x4b0 sys/kern/subr_witness.c:1176 #1 mtx_enter_try+0x100 #2 mtx_enter+0x4b sys/kern/kern_lock.c:266 #3 pool_put+0x64 sys/kern/subr_pool.c:792 #4 pmap_do_remove+0x5d3 sys/arch/amd64/amd64/pmap.c:1866 #5 uvm_map_teardown+0x195 uvm_map_addr_RBT_LEFT sys/uvm/uvm_map.h:176 [inline] #5 uvm_map_teardown+0x195 sys/uvm/uvm_map.c:2746 #6 uvmspace_free+0xa6 sys/uvm/uvm_map.c:3664 #7 reaper+0x189 sys/kern/kern_exit.c:457 #8 proc_trampoline+0x1c Process 45443 (idle0) thread 0xffff800021179710 (230509) exclusive kernel_lock &kernel_lock r = 1 (0xffffffff828b5980) #0 witness_lock+0x4b0 stacktrace_save sys/sys/stacktrace.h:36 [inline] #0 witness_lock+0x4b0 sys/kern/subr_witness.c:1176 #1 softintr_dispatch+0x4e sys/arch/amd64/amd64/softintr.c:90 #2 Xsoftclock+0x1f #3 acpicpu_idle+0x2eb sys/dev/acpi/acpicpu.c:1206 #4 sched_idle+0x417 sys/kern/kern_sched.c:178 #5 proc_trampoline+0x1c exclusive mutex /syzkaller/managers/multicore/kernel/sys/dev/kcov.c:125 r = 0 (0xffffffff8271ef30) #0 witness_lock+0x4b0 stacktrace_save sys/sys/stacktrace.h:36 [inline] #0 witness_lock+0x4b0 sys/kern/subr_witness.c:1176 #1 mtx_enter_try+0x100 #2 mtx_enter+0x4b sys/kern/kern_lock.c:266 #3 kcov_remote_leave+0x1f sys/dev/kcov.c:674 #4 timeout_run+0xd6 timeout_sync_leave sys/kern/kern_timeout.c:207 [inline] #4 timeout_run+0xd6 sys/kern/kern_timeout.c:676 #5 softclock_process_tick_timeout+0x196 sys/kern/kern_timeout.c:721 #6 softclock+0x11a sys/kern/kern_timeout.c:752 #7 softintr_dispatch+0xfb sys/arch/amd64/amd64/softintr.c:90 #8 Xsoftclock+0x1f #9 acpicpu_idle+0x2eb sys/dev/acpi/acpicpu.c:1206 #10 sched_idle+0x417 sys/kern/kern_sched.c:178 #11 proc_trampoline+0x1c shared mutex timeout r = 0 (0xffffffff82719570) #0 witness_lock+0x4b0 stacktrace_save sys/sys/stacktrace.h:36 [inline] #0 witness_lock+0x4b0 sys/kern/subr_witness.c:1176 #1 timeout_run+0xb7 sys/kern/kern_timeout.c:670 #2 softclock_process_tick_timeout+0x196 sys/kern/kern_timeout.c:721 #3 softclock+0x11a sys/kern/kern_timeout.c:752 #4 softintr_dispatch+0xfb sys/arch/amd64/amd64/softintr.c:90 #5 Xsoftclock+0x1f #6 acpicpu_idle+0x2eb sys/dev/acpi/acpicpu.c:1206 #7 sched_idle+0x417 sys/kern/kern_sched.c:178 #8 proc_trampoline+0x1c ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 9483 6415K 6423K 78643K 10602 0 pcb 13 8K 8K 78643K 17 0 rtable 105 3K 3K 78643K 199 0 ifaddr 44 10K 10K 78643K 45 0 counters 43 33K 33K 78643K 43 0 ioctlops 0 0K 4K 78643K 1574 0 mount 1 1K 1K 78643K 1 0 vnodes 1219 77K 77K 78643K 1226 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 1K 78643K 2 0 VM map 2 1K 1K 78643K 2 0 sem 4 0K 0K 78643K 6 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1825 197K 290K 78643K 13109 0 file desc 4 9K 25K 78643K 5240 0 proc 59 63K 95K 78643K 447 0 subproc 32 2K 2K 78643K 34 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 in_multi 33 2K 2K 78643K 33 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 37 175K 175K 78643K 37 0 exec 0 0K 2K 78643K 358 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 171 29K 29K 78643K 11511 0 UVM aobj 5 2K 2K 78643K 5 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 NDP 6 0K 0K 78643K 10 0 temp 66 3955K 4019K 78643K 12455 0 kqueue 3 4K 5K 78643K 181 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 arp 64 6 0 0 1 0 1 1 0 8 0 plcache 128 20 0 0 1 0 1 1 0 8 0 rtpcb 120 19 0 17 1 0 1 1 0 8 0 rtentry 112 45 0 1 2 0 2 2 0 8 0 unpcb 120 33 0 23 1 0 1 1 0 8 0 syncache 296 4 0 4 1 1 0 1 0 8 0 tcpqe 32 2103 0 2103 3 3 0 3 0 8 0 tcpcb 736 10 0 6 1 0 1 1 0 8 0 inpcb 296 43 0 36 1 0 1 1 0 8 0 nd6 48 6 0 0 1 0 1 1 0 8 0 kcovpl 48 2 0 0 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 pfstitem 24 12 0 10 1 0 1 1 0 8 0 pfstkey 112 12 0 10 1 0 1 1 0 8 0 pfstate 328 12 0 10 1 0 1 1 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 256 188 0 0 12 0 12 12 0 8 0 art_table 32 189 0 0 2 0 2 2 0 8 0 art_node 16 44 0 4 1 0 1 1 0 8 0 semupl 112 1 0 1 1 0 1 1 0 8 1 semapl 112 2 0 0 1 0 1 1 0 8 0 shmpl 112 2 0 0 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 6634 0 5230 88 0 88 88 0 8 0 ffsino 272 6634 0 5230 95 1 94 94 0 8 0 nchpl 144 12076 0 10470 60 0 60 60 0 8 0 uvmvnodes 72 5926 0 0 108 0 108 108 0 8 0 vnodes 208 5926 0 0 312 0 312 312 0 8 0 namei 1024 25266 0 25266 2 1 1 1 0 8 1 percpumem 16 32 0 0 1 0 1 1 0 8 0 scxspl 216 36294 0 36294 10 9 1 8 0 8 1 plimitpl 152 17 0 9 1 0 1 1 0 8 0 sigapl 424 5456 0 5425 4 0 4 4 0 8 0 futexpl 56 24467 0 24467 1 0 1 1 0 8 1 knotepl 112 152 0 132 1 0 1 1 0 8 0 kqueuepl 152 7886 0 7884 1 0 1 1 0 8 0 pipepl 304 88 0 77 3 1 2 2 0 8 1 fdescpl 496 5440 0 5425 3 0 3 3 0 8 0 filepl 152 14364 0 14262 6 1 5 5 0 8 0 lockfpl 104 41 0 40 1 0 1 1 0 8 0 lockfspl 48 19 0 18 1 0 1 1 0 8 0 sessionpl 144 18 0 7 1 0 1 1 0 8 0 pgrppl 48 18 0 7 1 0 1 1 0 8 0 ucredpl 96 111 0 102 1 0 1 1 0 8 0 zombiepl 144 5425 0 5423 2 1 1 1 0 8 0 processpl 1056 5456 0 5423 3 0 3 3 0 8 0 procpl 656 10901 0 10860 5 1 4 4 0 8 0 sockpl 400 95 0 76 5 2 3 3 0 8 1 mcl16k 16384 1 0 0 1 0 1 1 0 8 0 mcl12k 12288 2 0 0 1 0 1 1 0 8 0 mcl9k 9216 1 0 0 1 0 1 1 0 8 0 mcl8k 8192 3 0 0 1 0 1 1 0 8 0 mcl4k 4096 2 0 0 1 0 1 1 0 8 0 mcl2k 2048 404 0 0 50 0 50 50 0 8 0 mtagpl 96 1 0 0 1 0 1 1 0 8 0 mbufpl 256 470 0 0 27 0 27 27 0 8 0 bufpl 280 8708 0 2459 447 0 447 447 0 8 0 anonpl 16 368208 0 339580 117 1 116 116 0 124 0 amapchunkpl 152 17694 0 17056 26 1 25 26 0 158 0 amappl16 192 13500 0 12339 59 0 59 59 0 8 0 amappl15 184 1 0 1 1 1 0 1 0 8 0 amappl14 176 5238 0 5230 1 0 1 1 0 8 0 amappl13 168 1783 0 1781 1 0 1 1 0 8 0 amappl12 160 9 0 6 1 0 1 1 0 8 0 amappl11 152 54 0 39 1 0 1 1 0 8 0 amappl10 144 10 0 7 1 0 1 1 0 8 0 amappl9 136 363 0 363 1 1 0 1 0 8 0 amappl8 128 156 0 114 2 0 2 2 0 8 0 amappl7 120 245 0 237 1 0 1 1 0 8 0 amappl6 112 68 0 55 1 0 1 1 0 8 0 amappl5 104 2981 0 2964 1 0 1 1 0 8 0 amappl4 96 2892 0 2863 1 0 1 1 0 8 0 amappl3 88 128 0 120 1 0 1 1 0 8 0 amappl2 80 42646 0 42579 3 0 3 3 0 8 0 amappl1 72 157932 0 157448 25 15 10 19 0 8 0 amappl 80 11228 0 11109 3 0 3 3 0 84 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 64 4 0 0 1 0 1 1 0 8 0 uaddrrnd 24 5440 0 5425 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 5440 0 5425 1 0 1 1 0 8 0 vmmpekpl 168 23632 0 23610 2 0 2 2 0 8 0 vmmpepl 168 672862 0 670450 152 39 113 136 0 357 2 vmsppl 368 5439 0 5424 2 0 2 2 0 8 0 pdppl 4096 10887 0 10848 65 24 41 45 0 8 2 pvpl 32 2151960 0 2120331 274 8 266 266 0 265 7 pmappl 232 5439 0 5424 2 1 1 2 0 8 0 extentpl 40 57 0 39 1 0 1 1 0 8 0 phpool 112 359 0 31 10 0 10 10 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:398 panic(ffffffff823cd905) at panic+0x15e sys/kern/subr_prf.c:218 witness_checkorder(ffffffff828b37d8,1,0) at witness_checkorder+0x1146 sys/kern/subr_witness.c:833 rw_enter_read(ffffffff828b37c8) at rw_enter_read+0x66 sys/kern/kern_rwlock.c:111 uvmfault_lookup(ffff80002117f878,0) at uvmfault_lookup+0xd9 sys/uvm/uvm_fault.c:1534 uvm_fault_check(ffff80002117f878,ffff80002117f8b0,ffff80002117f840,2) at uvm_fault_check+0x3d sys/uvm/uvm_fault.c:511 uvm_fault(ffffffff828b37c0,ffff8000244c9000,0,2) at uvm_fault+0xcc sys/uvm/uvm_fault.c:935 kpageflttrap(ffff80002117fa20,ffff8000244c9fe8) at kpageflttrap+0x202 sys/arch/amd64/amd64/trap.c:265 kerntrap(ffff80002117fa20) at kerntrap+0xef sys/arch/amd64/amd64/trap.c:321 alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b memcpy() at memcpy+0x15 timeout_run(ffff800021283a80) at timeout_run+0xd6 timeout_sync_leave sys/kern/kern_timeout.c:207 [inline] timeout_run(ffff800021283a80) at timeout_run+0xd6 sys/kern/kern_timeout.c:676 softclock_process_tick_timeout(ffff800021283a80,0) at softclock_process_tick_timeout+0x196 sys/kern/kern_timeout.c:721 softclock(0) at softclock+0x11a sys/kern/kern_timeout.c:752 softintr_dispatch(0) at softintr_dispatch+0xfb sys/arch/amd64/amd64/softintr.c:90 Xsoftclock() at Xsoftclock+0x1f acpicpu_idle() at acpicpu_idle+0x2eb sys/dev/acpi/acpicpu.c:1206 sched_idle(ffffffff826f6ff0) at sched_idle+0x417 sys/kern/kern_sched.c:178 end trace frame: 0x0, count: -18 ddb{0}> machine ddbcpu 1 Stopped at x86_ipi_db+0x1a: addq $0x8,%rsp x86_ipi_db(ffff800020d68ff0) at x86_ipi_db+0x1a sys/arch/amd64/amd64/db_interface.c:352 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(ffffffff828b5778) at __mp_lock+0x122 __mp_lock_spin sys/kern/kern_lock.c:116 [inline] __mp_lock(ffffffff828b5778) at __mp_lock+0x122 sys/kern/kern_lock.c:147 uvm_unmap_detach(ffff8000211c1320,1) at uvm_unmap_detach+0xfc sys/uvm/uvm_map.c:1588 uvm_map_teardown(fffffd807effa5c0) at uvm_map_teardown+0x262 sys/uvm/uvm_map.c:2764 uvmspace_free(fffffd807effa5c0) at uvmspace_free+0xa6 sys/uvm/uvm_map.c:3664 reaper(ffff8000211c3c38) at reaper+0x189 sys/kern/kern_exit.c:457 end trace frame: 0x0, count: 7 ddb{1}> trace x86_ipi_db(ffff800020d68ff0) at x86_ipi_db+0x1a sys/arch/amd64/amd64/db_interface.c:352 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(ffffffff828b5778) at __mp_lock+0x122 __mp_lock_spin sys/kern/kern_lock.c:116 [inline] __mp_lock(ffffffff828b5778) at __mp_lock+0x122 sys/kern/kern_lock.c:147 uvm_unmap_detach(ffff8000211c1320,1) at uvm_unmap_detach+0xfc sys/uvm/uvm_map.c:1588 uvm_map_teardown(fffffd807effa5c0) at uvm_map_teardown+0x262 sys/uvm/uvm_map.c:2764 uvmspace_free(fffffd807effa5c0) at uvmspace_free+0xa6 sys/uvm/uvm_map.c:3664 reaper(ffff8000211c3c38) at reaper+0x189 sys/kern/kern_exit.c:457 end trace frame: 0x0, count: -8