login: witness: lock order reversal: 1st 0xffffffff83ab2620 &sched_lock (&sched_lock) 2nd 0xffff8000299bee30 &cq->cq_mtx (&cq->cq_mtx) lock order [1] &sched_lock (&sched_lock) -> [2] &cq->cq_mtx (&cq->cq_mtx) #0 mtx_enter+0x95 sys/kern/kern_lock.c:406 #1 clockintr_cancel+0x2f sys/kern/kern_clockintr.c:323 #2 mi_switch+0x187 sys/kern/sched_bsd.c:376 #3 sleep_finish+0x2d8 sys/kern/kern_synch.c:369 #4 sys_futex+0xb90 futex_wait sys/kern/sys_futex.c:306 [inline] #4 sys_futex+0xb90 sys/kern/sys_futex.c:155 #5 syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] #5 syscall+0xbd4 sys/arch/amd64/amd64/trap.c:783 #6 Xsyscall+0x128 lock order [2] &cq->cq_mtx (&cq->cq_mtx) -> [1] &sched_lock (&sched_lock) #0 mtx_enter+0x95 sys/kern/kern_lock.c:406 #1 sleep_setup+0xed sys/kern/kern_synch.c:304 #2 msleep_nsec+0x10b sys/kern/kern_synch.c:217 #3 dt_ioctl_record_stop+0xbc sys/dev/dt/dt_dev.c:589 #4 dtclose+0x109 dt_pcb_purge sys/dev/dt/dt_dev.c:-1 [inline] #4 dtclose+0x109 sys/dev/dt/dt_dev.c:239 #5 spec_close+0x466 sys/kern/spec_vnops.c:-1 #6 VOP_CLOSE+0x132 sys/kern/vfs_vops.c:156 #7 vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline] #7 vn_closefile+0x12b sys/kern/vfs_vnops.c:615 #8 fdrop+0x121 sys/kern/kern_descrip.c:1281 #9 closef+0x192 sys/kern/kern_descrip.c:1265 #10 syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] #10 syscall+0xbd4 sys/arch/amd64/amd64/trap.c:783 #11 Xsyscall+0x128 Stopped at db_enter+0x25: addq $0x8,%rsp ddb{1}> ddb{1}> set $lines = 0 ddb{1}> set $maxwidth = 0 ddb{1}> show panic the kernel did not panic ddb{1}> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 witness_checkorder(ffff8000299bee30,9,0) at witness_checkorder+0x10d1 sys/kern/subr_witness.c:-1 mtx_enter(ffff8000299bee20) at mtx_enter+0x95 sys/kern/kern_lock.c:406 clockintr_cancel(ffff8000299be2f8) at clockintr_cancel+0x2f sys/kern/kern_clockintr.c:323 mi_switch() at mi_switch+0x187 sys/kern/sched_bsd.c:376 sleep_finish(ffffffffffffffff,1) at sleep_finish+0x2d8 sys/kern/kern_synch.c:369 sys_futex(ffff800035bc94e8,ffff8000337c4d60,ffff8000337c4cb0) at sys_futex+0xb90 futex_wait sys/kern/sys_futex.c:306 [inline] sys_futex(ffff800035bc94e8,ffff8000337c4d60,ffff8000337c4cb0) at sys_futex+0xb90 sys/kern/sys_futex.c:155 syscall(ffff8000337c4d60) at syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff8000337c4d60) at syscall+0xbd4 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xd7808e77fa0, count: -9 ddb{1}> show registers rdi 0 rsi 0x80000 acpi_pdirpa+0x6be71 rbp 0xffff8000337c4930 rbx 0 rdx 0xffff8000015e8340 rcx 0xffff800035bc94e8 rax 0x7ffff acpi_pdirpa+0x6be70 r8 0xffff8000337c4810 r9 0x8080808080808080 r10 0xd49b8a99f640cdb2 r11 0x9c1fc3b6b5b1759a r12 0xfffffd800402c300 r13 0xfffffd800481cd58 r14 0x3 r15 0xffffffff834b0c55 substchar+0x93dc rip 0xffffffff81c226d5 db_enter+0x25 cs 0x8 rflags 0x246 rsp 0xffff8000337c4920 ss 0x10 db_enter+0x25: addq $0x8,%rsp ddb{1}> show proc PROC (syz-executor) tid=261648 pid=75052 tcnt=2 stat=sleep flags process=4000000 proc=4000080 runpri=86, usrpri=86, slppri=32, nice=20 wchan=0xffff8000337c4bd0, wmesg=fsleep, ps_single=0x0 scnt=0 ecnt=0 forw=0x0, list=0xffff800035bc82c0,0xffff800035bc9cc0 process=0xffff8000fffeab70 user=0xffff8000337bf000, vmspace=0xfffffd807878b7b8 estcpu=36, cpticks=1, pctcpu=0.0, user=0, sys=1, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 74304 476685 99220 0 2 0 syz-executor 75052 327778 92645 0 7 0x4000000 syz-executor *75052 261648 92645 0 3 0x4000080 fsleep syz-executor 67416 20808 99897 0 2 0 syz-executor 67416 39001 99897 0 3 0x4000080 fsleep syz-executor 57526 306346 15105 0 2 0 syz-executor 57526 438020 15105 0 3 0x4000080 fifow syz-executor 57501 512032 84917 0 2 0 syz-executor 57501 316691 84917 0 3 0x4000080 fsleep syz-executor 87439 449335 80227 0 4 0x82000 syz-executor 87439 149663 80227 0 3 0x4082000 biowait syz-executor 87439 204547 80227 0 4 0x4082000 syz-executor 87439 182894 80227 0 3 0x4002000 suspend syz-executor 4203 386482 14530 0 3 0x80 nanoslp syz-executor 4203 75446 14530 0 3 0x4000080 sbwait syz-executor 4203 125912 14530 0 3 0x4000080 fsleep syz-executor 4707 92110 46449 0 3 0x80 nanoslp syz-executor 4707 408415 46449 0 3 0x4000080 sbwait syz-executor 4707 200785 46449 0 3 0x4000080 fsleep syz-executor 40707 248762 1 0 3 0x82 nanoslp getty 80227 481332 988 0 3 0x82 nanoslp syz-executor 46449 19879 988 0 3 0x82 nanoslp syz-executor 99897 159433 988 0 3 0x82 nanoslp syz-executor 99220 373180 988 0 3 0x82 nanoslp syz-executor 14530 303344 988 0 3 0x82 nanoslp syz-executor 92645 307116 988 0 3 0x82 nanoslp syz-executor 84917 155053 988 0 3 0x82 nanoslp syz-executor 15105 59731 988 0 3 0x82 nanoslp syz-executor 988 408918 30038 0 3 0x82 kqread syz-executor 30038 487516 12 0 3 0x10008a sigsusp ksh 12 335116 5312 0 3 0x98 kqread sshd-session 5312 114194 81248 0 3 0x92 kqread sshd-session 81248 137313 1 0 3 0x88 kqread sshd 13217 230866 96098 74 3 0x1100092 bpf pflogd 96098 519315 1 0 3 0x80 sbwait pflogd 33584 480343 63477 73 3 0x1100090 kqread syslogd 63477 20961 1 0 3 0x100082 sbwait syslogd 17378 491709 1 0 3 0x100080 kqread resolvd 14215 379580 34901 77 3 0x100092 kqread dhcpleased 46296 467320 34901 77 3 0x100092 kqread dhcpleased 34901 105711 1 0 3 0x80 kqread dhcpleased 6949 262281 0 0 3 0x14200 bored smr 89713 71683 0 0 2 0x14200 zerothread 29380 307860 0 0 3 0x14200 aiodoned aiodoned 89174 51556 0 0 3 0x14200 syncer update 43806 15626 0 0 3 0x14200 cleaner cleaner 98620 154790 0 0 3 0x14200 reaper reaper 18181 144729 0 0 3 0x14200 pgdaemon pagedaemon 54870 70982 0 0 3 0x14200 bored viomb 5332 233947 0 0 3 0x40014200 acpi0 acpi0 81304 457032 0 0 3 0x40014200 idle1 8987 334505 0 0 3 0x14200 bored softnet1 1637 472768 0 0 3 0x14200 bored softnet0 22201 251144 0 0 3 0x14200 bored systqmp 56256 2717 0 0 3 0x14200 bored systq 24882 273210 0 0 3 0x14200 tmoslp softclockmp 79188 28094 0 0 3 0x40014200 tmoslp softclock 32156 463740 0 0 3 0x40014200 idle0 1 167953 0 0 3 0x82 wait init 0 0 -1 0 3 0x10010200 scheduler swapper ddb{1}> show all locks CPU 1: exclusive mutex &sched_lock r = 0 (0xffffffff83ab2620) #0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160 #1 mtx_enter+0x4b4 sys/kern/kern_lock.c:487 #2 sleep_finish+0x1d6 sys/kern/kern_synch.c:357 #3 sys_futex+0xb90 futex_wait sys/kern/sys_futex.c:306 [inline] #3 sys_futex+0xb90 sys/kern/sys_futex.c:155 #4 syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] #4 syscall+0xbd4 sys/arch/amd64/amd64/trap.c:783 #5 Xsyscall+0x128 Process 75052 (syz-executor) thread 0xffff800035bc82c0 (327778) exclusive kernel_lock &kernel_lock r = 1 (0xffffffff8395eb80) #0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160 #1 intr_handler+0xe9 sys/arch/amd64/amd64/intr.c:560 #2 Xintr_ioapic_edge23_untramp+0x18f #3 __sanitizer_cov_trace_cmp4+0x1d kd_curproc sys/dev/kcov.c:580 [inline] #3 __sanitizer_cov_trace_cmp4+0x1d sys/dev/kcov.c:206 #4 uvm_map_protect+0x6fa sys/uvm/uvm_map.c:3149 #5 sys_mprotect+0x351 sys/uvm/uvm_mmap.c:590 #6 syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] #6 syscall+0xbd4 sys/arch/amd64/amd64/trap.c:783 #7 Xsyscall+0x128 exclusive rwlock vmmaplk r = 0 (0xfffffd807878b8b8) #0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160 #1 rw_do_enter_write+0x419 sys/kern/kern_rwlock.c:320 #2 vm_map_lock_ln+0x12e sys/uvm/uvm_map.c:5171 #3 uvm_map_protect+0xe0 sys/uvm/uvm_map.c:3075 #4 sys_mprotect+0x351 sys/uvm/uvm_mmap.c:590 #5 syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] #5 syscall+0xbd4 sys/arch/amd64/amd64/trap.c:783 #6 Xsyscall+0x128 Process 87439 (syz-executor) thread 0xffff800035bc6d18 (149663) exclusive rrwlock inode r = 0 (0xfffffd806f0878f0) #0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160 #1 rw_do_enter_write+0x419 sys/kern/kern_rwlock.c:320 #2 rrw_enter+0xc6 sys/kern/kern_rwlock.c:621 #3 VOP_LOCK+0xbd sys/kern/vfs_vops.c:527 #4 vn_lock+0xa4 sys/kern/vfs_vnops.c:570 #5 vn_write+0x18f sys/kern/vfs_vnops.c:405 #6 dofilewritev+0x2bd sys/kern/sys_generic.c:384 #7 sys_write+0xa2 sys/kern/sys_generic.c:300 #8 syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] #8 syscall+0xbd4 sys/arch/amd64/amd64/trap.c:783 #9 Xsyscall+0x128 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 11077 12215K 14034K 166960K 12750 0 pcb 17 14K 16K 166960K 178 0 rtable 235 8K 8K 166960K 398 0 pf 41 18K 18K 166960K 71 0 ifaddr 46 8K 8K 166960K 58 0 ifgroup 59 2K 2K 166960K 75 0 sysctl 4 1K 9K 166960K 73 0 counters 78 37K 37K 166960K 100 0 ioctlops 0 0K 4K 166960K 1742 0 iov 0 0K 12K 166960K 23 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1423 89K 90K 166960K 1705 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 9K 166960K 5 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 0K 166960K 15 0 dirhash 12 2K 2K 166960K 15 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 18 65K 93K 166960K 380 0 sigio 0 0K 0K 166960K 5 0 proc 72 115K 164K 166960K 616 0 subproc 72 4K 4K 166960K 72 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 28 0 in_multi 99 7K 7K 166960K 107 0 ether_multi 1 0K 0K 166960K 4 0 mrt 0 0K 0K 166960K 15 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 73 334K 334K 166960K 73 0 exec 0 0K 1K 166960K 424 0 fusefs mount 1 32K 32K 166960K 1 0 tdb 3 0K 0K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 233 143K 152K 166960K 5401 0 UVM aobj 72 136K 136K 166960K 72 0 pinsyscall 43 86K 103K 166960K 1561 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 30 0 NDP 14 0K 2K 166960K 38 0 temp 45 9076K 9143K 166960K 13954 0 kqueue 14 22K 28K 166960K 73 0 SYN cache 2 16K 16K 166960K 2 0 ddb{1}> show all pools Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle plcache 128 26 0 0 1 0 1 1 0 8 0 rtpcb 120 47 0 44 1 0 1 1 0 8 0 rtentry 176 119 0 15 6 0 6 6 0 8 0 unpcb 144 210 0 186 2 0 2 2 0 8 1 syncache 336 5 0 5 1 0 1 1 0 8 1 tcpcb 736 100 0 96 4 0 4 4 0 8 3 arp 136 19 0 1 1 0 1 1 0 8 0 inpcb 328 600 0 592 7 0 7 7 0 8 5 nd6 152 27 0 0 2 0 2 2 0 8 0 pkpcb 40 1 0 1 1 0 1 1 0 8 1 kcovpl 48 8 0 0 1 0 1 1 0 8 0 ppxss 1192 15 0 11 1 0 1 1 0 8 0 pffrag 232 2 0 0 1 0 1 1 0 482 0 pffrnode 88 2 0 0 1 0 1 1 0 8 0 pffrent 40 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 35 0 0 1 0 1 1 0 8 0 pfstkey 128 35 0 0 2 0 2 2 0 8 0 pfstate 448 34 0 0 4 0 4 4 0 8 0 pfrule 1360 22 0 17 2 1 1 2 0 8 0 rttmr 136 1 0 1 1 0 1 1 0 8 1 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 513 0 43 30 0 30 30 0 8 0 art_table 40 514 0 43 5 0 5 5 0 8 0 art_node 32 119 0 26 1 0 1 1 0 8 0 semapl 112 13 0 3 1 0 1 1 0 8 0 shmpl 112 2 0 0 1 0 1 1 0 8 0 dirhash 1024 19 0 2 3 0 3 3 0 8 0 dino2pl 256 2097 0 626 93 0 93 93 0 8 0 ffsino 296 2097 0 626 114 0 114 114 0 8 0 nchpl 144 2641 0 939 64 0 64 64 0 8 0 rtmask 32 2 0 1 1 0 1 1 0 8 0 vnodes 216 2385 0 0 133 0 133 133 0 8 0 namei 1024 9065 0 9065 1 0 1 1 0 8 1 percpumem 16 65 0 11 1 0 1 1 0 8 0 vcpupl 3968 67 0 0 9 0 9 9 0 8 0 vmpool 848 67 0 0 8 0 8 8 0 8 0 kstatmem 264 46 0 16 3 0 3 3 0 8 1 scsiplug 72 2 0 2 1 0 1 1 0 8 1 scxspl 216 9814 0 9813 9 1 8 8 1 8 7 plimitpl 152 113 0 95 1 0 1 1 0 8 0 sigapl 424 705 0 657 7 0 7 7 0 8 1 knotepl 120 311 0 0 10 0 10 10 0 8 0 kqueuepl 224 99 0 87 1 0 1 1 0 8 0 pipepl 344 205 0 178 6 0 6 6 0 8 3 fdescpl 528 688 0 656 3 0 3 3 0 8 0 filepl 160 4108 0 3882 18 0 18 18 0 8 6 lockfpl 104 167 0 163 1 0 1 1 0 8 0 lockfspl 48 47 0 43 1 0 1 1 0 8 0 sessionpl 144 24 0 16 1 0 1 1 0 8 0 pgrppl 48 37 0 21 1 0 1 1 0 8 0 ucredpl 104 602 0 588 1 0 1 1 0 8 0 zombiepl 144 657 0 657 1 0 1 1 0 8 1 processpl 1232 705 0 657 5 0 5 5 0 8 0 procpl 664 1124 0 1065 6 0 6 6 0 8 0 sosppl 176 4 0 4 1 0 1 1 0 8 1 sockpl 752 931 0 896 11 0 11 11 0 8 6 mcl64k 65536 3 0 0 1 0 1 1 0 8 0 mcl16k 16384 3 0 0 1 0 1 1 0 8 0 mcl9k 9216 1 0 0 1 0 1 1 0 8 0 mcl8k 8192 2 0 0 1 0 1 1 0 8 0 mcl4k 4096 125 0 0 16 0 16 16 0 8 0 mcl2k 2048 18 0 0 3 0 3 3 0 8 0 mtagpl 96 3 0 0 1 0 1 1 0 8 0 mbufpl 256 416 0 0 26 0 26 26 0 8 0 bufpl 280 3454 0 118 239 0 239 239 0 8 0 anonpl 32 5686 0 0 46 0 46 46 0 246 0 amapchunkpl 152 16407 0 15922 26 0 26 26 0 158 4 amappl16 200 2367 0 2304 7 2 5 5 0 8 0 amappl15 192 8 0 8 1 1 0 1 0 8 0 amappl14 184 438 0 437 1 0 1 1 0 8 0 amappl13 176 133 0 121 1 0 1 1 0 8 0 amappl12 168 988 0 958 2 0 2 2 0 8 0 amappl11 160 6 0 6 1 1 0 1 0 8 0 amappl10 152 72 0 56 1 0 1 1 0 8 0 amappl9 144 264 0 264 1 1 0 1 0 8 0 amappl8 136 115 0 113 1 0 1 1 0 8 0 amappl7 128 62 0 60 1 0 1 1 0 8 0 amappl6 120 282 0 270 1 0 1 1 0 8 0 amappl5 112 85 0 76 1 0 1 1 0 8 0 amappl4 104 511 0 470 2 0 2 2 0 8 0 amappl3 96 2742 0 2652 3 0 3 3 0 8 0 amappl2 88 845 0 775 2 0 2 2 0 8 0 amappl1 80 10886 0 10288 15 1 14 14 0 8 0 amappl 88 4609 0 4444 5 0 5 5 0 92 0 uvmvnodes 80 107 0 0 3 0 3 3 0 8 0 dma4096 4096 1 0 1 1 1 0 1 0 8 0 dma2048 2048 1 0 1 1 0 1 1 0 8 1 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 71 0 0 2 0 2 2 0 8 0 uaddrrnd 24 688 0 656 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 688 0 656 1 0 1 1 0 8 0 vmmpekpl 168 7614 0 7583 2 0 2 2 0 8 0 vmmpepl 168 52168 0 50170 93 0 93 93 0 357 3 vmsppl 488 687 0 656 5 0 5 5 0 8 1 rwobjpl 80 17413 0 16271 26 0 26 26 0 8 1 pdppl 4096 1517 0 1379 160 22 138 140 0 8 0 pvpl 32 14443 0 0 118 1 117 117 0 265 0 pmappl 256 754 0 656 7 0 7 7 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 358 0 25 10 0 10 10 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp ddb{0}> trace x86_ipi_db(ffffffff83942ff0) at x86_ipi_db+0x27 sys/arch/amd64/amd64/db_interface.c:394 x86_ipi_handler() at x86_ipi_handler+0xd9 sys/arch/amd64/amd64/ipi.c:106 Xresume_lapic_ipi() at Xresume_lapic_ipi+0x27 __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x33 kd_curproc sys/dev/kcov.c:585 [inline] __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x33 sys/dev/kcov.c:153 mtx_enter(ffffffff83ab2610) at mtx_enter+0x375 sys/kern/kern_lock.c:455 wakeup_n(fffffd80601a6138,ffffffff) at wakeup_n+0x54 sys/kern/kern_synch.c:581 sd_buf_done(fffffd806cf81448) at sd_buf_done+0x2de sys/scsi/sd.c:772 scsi_done(fffffd806cf81448) at scsi_done+0x40 sys/scsi/scsi_base.c:1496 vioscsi_vq_done(ffff8000000a4268) at vioscsi_vq_done+0xe1 sys/dev/pv/vioscsi.c:-1 intr_handler(ffff80003c4050f0,ffff8000002a3480) at intr_handler+0x125 sys/arch/amd64/amd64/intr.c:564 Xintr_ioapic_edge23_untramp() at Xintr_ioapic_edge23_untramp+0x18f __sanitizer_cov_trace_cmp4(3,0) at __sanitizer_cov_trace_cmp4+0x1d kd_curproc sys/dev/kcov.c:580 [inline] __sanitizer_cov_trace_cmp4(3,0) at __sanitizer_cov_trace_cmp4+0x1d sys/dev/kcov.c:206 uvm_map_protect(fffffd807878b7b8,d78e8242000,d78e8642000,3,0,0,74c8f61a6a7789b4) at uvm_map_protect+0x6fa sys/uvm/uvm_map.c:3149 sys_mprotect(ffff800035bc82c0,ffff80003c4053c0,ffff80003c405310) at sys_mprotect+0x351 sys/uvm/uvm_mmap.c:590 syscall(ffff80003c4053c0) at syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c4053c0) at syscall+0xbd4 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x729188976ae0, count: -16 ddb{0}> machine ddbcpu 1 Stopped at db_enter+0x25: addq $0x8,%rsp ddb{1}> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 witness_checkorder(ffff8000299bee30,9,0) at witness_checkorder+0x10d1 sys/kern/subr_witness.c:-1 mtx_enter(ffff8000299bee20) at mtx_enter+0x95 sys/kern/kern_lock.c:406 clockintr_cancel(ffff8000299be2f8) at clockintr_cancel+0x2f sys/kern/kern_clockintr.c:323 mi_switch() at mi_switch+0x187 sys/kern/sched_bsd.c:376 sleep_finish(ffffffffffffffff,1) at sleep_finish+0x2d8 sys/kern/kern_synch.c:369 sys_futex(ffff800035bc94e8,ffff8000337c4d60,ffff8000337c4cb0) at sys_futex+0xb90 futex_wait sys/kern/sys_futex.c:306 [inline] sys_futex(ffff800035bc94e8,ffff8000337c4d60,ffff8000337c4cb0) at sys_futex+0xb90 sys/kern/sys_futex.c:155 syscall(ffff8000337c4d60) at syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff8000337c4d60) at syscall+0xbd4 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xd7808e77fa0, count: -9