witness: lock order reversal: 1st 0xffffffff8392cac0 &sched_lock (&sched_lock) 2nd 0xffff8000299dee30 &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:775 #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:1280 #9 closef+0x192 sys/kern/kern_descrip.c:1264 #10 fdfree+0x116 sys/kern/kern_descrip.c:1195 #11 exit1+0x576 sys/kern/kern_exit.c:215 #12 sys_exit+0x1a sys/kern/kern_exit.c:-1 #13 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] #13 syscall+0xb17 sys/arch/amd64/amd64/trap.c:775 #14 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(ffff8000299dee30,9,0) at witness_checkorder+0x10d1 sys/kern/subr_witness.c:-1 mtx_enter(ffff8000299dee20) at mtx_enter+0x95 sys/kern/kern_lock.c:406 clockintr_cancel(ffff8000299de2f8) 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(ffff80003c409250,ffff80003b7f7080,ffff80003b7f6fd0) at sys_futex+0xb90 futex_wait sys/kern/sys_futex.c:306 [inline] sys_futex(ffff80003c409250,ffff80003b7f7080,ffff80003b7f6fd0) at sys_futex+0xb90 sys/kern/sys_futex.c:155 syscall(ffff80003b7f7080) at syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003b7f7080) at syscall+0xbd4 sys/arch/amd64/amd64/trap.c:775 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x478cd688040, count: -9 ddb{1}> show registers rdi 0 rsi 0x80000 acpi_pdirpa+0x6be71 rbp 0xffff80003b7f6c50 rbx 0 rdx 0xffff80000002a740 rcx 0xffff80003c409250 rax 0x7ffff acpi_pdirpa+0x6be70 r8 0xffff80003b7f6b30 r9 0x8080808080808080 r10 0xf02e5d5bf9f63a3f r11 0xe961a00a88ce3f34 r12 0xfffffd8003f49300 r13 0xfffffd8004739d58 r14 0x3 r15 0xffffffff8342440c substchar+0xe0b0 rip 0xffffffff82de7905 db_enter+0x25 cs 0x8 rflags 0x246 rsp 0xffff80003b7f6c40 ss 0x10 db_enter+0x25: addq $0x8,%rsp ddb{1}> show proc PROC (syz-executor) tid=146578 pid=77148 tcnt=2 stat=sleep flags process=4000000 proc=4000080 runpri=50, usrpri=50, slppri=32, nice=20 wchan=0xffff80003b7f6ef0, wmesg=fsleep, ps_single=0x0 scnt=0 ecnt=0 forw=0x0, list=0xffff80003c408a88,0xffffffff83932170 process=0xffff80003c40c020 user=0xffff80003b7f2000, vmspace=0xfffffd806c9913e8 estcpu=36, cpticks=0, pctcpu=0.0, user=0, sys=0, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 77148 491518 92608 0 7 0x4000000 syz-executor *77148 146578 92608 0 3 0x4000080 fsleep syz-executor 69278 304101 68510 0 2 0x1000000 syz-executor 69278 68483 68510 0 3 0x5000000 biowait syz-executor 69278 436116 68510 0 3 0x5000080 fsleep syz-executor 49336 398248 5992 0 2 0 syz-executor 49336 9145 5992 0 3 0x4000080 fsleep syz-executor 49336 385283 5992 0 3 0x4000080 fsleep syz-executor 84238 313649 40499 60929 2 0x10 syz-executor 84238 298805 40499 60929 3 0x4000090 fsleep syz-executor 92913 421775 47519 0 2 0 syz-executor 92913 480107 47519 0 2 0x4000000 syz-executor 58646 80517 7497 0 2 0 syz-executor 56801 991 92915 0 2 0 syz-executor 56801 130298 92915 0 2 0x4000000 syz-executor 94501 189900 0 0 3 0x14200 acct acct 92915 522271 44476 0 3 0x82 nanoslp syz-executor 51718 447693 44476 0 2 0x2 syz-executor 47519 489814 44476 0 2 0x2 syz-executor 5992 106584 44476 0 3 0x82 nanoslp syz-executor 40499 332760 44476 0 3 0x82 nanoslp syz-executor 92608 491623 44476 0 3 0x82 nanoslp syz-executor 7497 38578 44476 0 3 0x82 nanoslp syz-executor 68510 34168 44476 0 3 0x82 nanoslp syz-executor 44476 255391 29314 0 3 0x82 kqread syz-executor 29314 480712 57721 0 3 0x10008a sigsusp ksh 57721 26945 6956 0 3 0x98 kqread sshd-session 6956 154837 43559 0 3 0x92 kqread sshd-session 99965 209228 1 0 3 0x100083 ttyin getty 43559 166493 1 0 3 0x88 kqread sshd 56457 352564 16427 74 3 0x1100092 bpf pflogd 16427 245625 1 0 3 0x80 sbwait pflogd 52614 95877 32723 73 3 0x1100090 kqread syslogd 32723 11197 1 0 3 0x100082 sbwait syslogd 82394 355758 1 0 3 0x100080 kqread resolvd 28467 482438 34802 77 3 0x100092 kqread dhcpleased 72403 212650 34802 77 3 0x100092 kqread dhcpleased 34802 130349 1 0 3 0x80 kqread dhcpleased 76962 229374 0 0 3 0x14200 bored smr 59243 272646 0 0 2 0x14200 zerothread 83804 199524 0 0 3 0x14200 aiodoned aiodoned 28805 509607 0 0 3 0x14200 syncer update 70895 457834 0 0 3 0x14200 cleaner cleaner 45301 357037 0 0 3 0x14200 reaper reaper 1588 85267 0 0 3 0x14200 pgdaemon pagedaemon 80723 256350 0 0 3 0x14200 bored viomb 30897 249833 0 0 3 0x40014200 acpi0 acpi0 49247 250513 0 0 3 0x40014200 idle1 49857 489557 0 0 3 0x14200 bored softnet1 84373 412111 0 0 3 0x14200 bored softnet0 5524 477990 0 0 3 0x14200 bored systqmp 27536 483409 0 0 3 0x14200 bored systq 51584 165422 0 0 3 0x14200 tmoslp softclockmp 37658 479144 0 0 3 0x40014200 tmoslp softclock 74969 293887 0 0 3 0x40014200 idle0 1 322428 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks CPU 1: exclusive mutex &sched_lock r = 0 (0xffffffff8392cac0) #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:775 #5 Xsyscall+0x128 Process 77148 (syz-executor) thread 0xffff80003c408a88 (491518) exclusive kernel_lock &kernel_lock r = 1 (0xffffffff83953e48) #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_pc+0xf kd_curproc sys/dev/kcov.c:580 [inline] #3 __sanitizer_cov_trace_pc+0xf sys/dev/kcov.c:153 #4 uvm_pagelookup+0x54 uvm_objtree_RBT_FIND sys/uvm/uvm_object.h:93 [inline] #4 uvm_pagelookup+0x54 sys/uvm/uvm_page.c:1214 #5 uvn_get+0x486 sys/uvm/uvm_vnode.c:-1 #6 uvm_fault_lower_lookup+0x10d sys/uvm/uvm_fault.c:1206 #7 uvm_fault_lower+0x89 sys/uvm/uvm_fault.c:1334 #8 uvm_fault+0x274 sys/uvm/uvm_fault.c:-1 #9 upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:192 #10 usertrap+0x42f sys/arch/amd64/amd64/trap.c:632 #11 recall_trap+0x8 shared rwlock uobjlk r = 0 (0xfffffd806db25cc0) #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_read+0x3e8 sys/kern/kern_rwlock.c:413 #2 uvm_fault_lower_lookup+0x53 sys/uvm/uvm_fault.c:1204 #3 uvm_fault_lower+0x89 sys/uvm/uvm_fault.c:1334 #4 uvm_fault+0x274 sys/uvm/uvm_fault.c:-1 #5 upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:192 #6 usertrap+0x42f sys/arch/amd64/amd64/trap.c:632 #7 recall_trap+0x8 shared rwlock vmmaplk r = 0 (0xfffffd806c9914e8) #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_read+0x3e8 sys/kern/kern_rwlock.c:413 #2 uvmfault_lookup+0x122 sys/uvm/uvm_fault.c:1880 #3 uvm_fault_check+0x4f sys/uvm/uvm_fault.c:693 #4 uvm_fault+0x106 sys/uvm/uvm_fault.c:627 #5 upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:192 #6 usertrap+0x42f sys/arch/amd64/amd64/trap.c:632 #7 recall_trap+0x8 Process 69278 (syz-executor) thread 0xffff80003c408558 (68483) exclusive rrwlock inode r = 0 (0xfffffd8062ec5330) #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+0x242 sys/kern/sys_generic.c:380 #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:775 #9 Xsyscall+0x128 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 11057 12149K 12257K 166960K 12192 0 pcb 17 14K 16K 166960K 105 0 rtable 239 6K 7K 166960K 354 0 pf 34 17K 18K 166960K 40 0 ifaddr 43 7K 7K 166960K 46 0 ifgroup 55 2K 2K 166960K 59 0 sysctl 1 1K 9K 166960K 6 0 counters 70 37K 37K 166960K 72 0 ioctlops 0 0K 4K 166960K 1472 0 iov 0 0K 4K 166960K 2 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1337 84K 84K 166960K 1397 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 5K 166960K 3 0 VM map 2 1K 1K 166960K 2 0 sem 3 0K 0K 166960K 3 0 dirhash 12 2K 2K 166960K 15 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 17 61K 89K 166960K 186 0 proc 71 115K 164K 166960K 541 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 6 0 in_multi 99 7K 7K 166960K 103 0 ether_multi 1 0K 0K 166960K 3 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 49 228K 228K 166960K 49 0 exec 0 0K 1K 166960K 449 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 229 167K 175K 166960K 3674 0 UVM aobj 4 2K 2K 166960K 4 0 pinsyscall 42 84K 100K 166960K 1313 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 NDP 12 0K 2K 166960K 29 0 temp 68 8674K 8739K 166960K 6059 0 kqueue 13 20K 22K 166960K 30 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 36 0 33 1 0 1 1 0 8 0 rtentry 176 112 0 1 6 0 6 6 0 8 0 unpcb 144 49 0 32 1 0 1 1 0 8 0 syncache 336 3 0 3 1 0 1 1 0 8 1 tcpcb 736 19 0 15 1 0 1 1 0 8 0 arp 136 18 0 0 1 0 1 1 0 8 0 inpcb 328 162 0 154 7 0 7 7 0 8 6 nd6 152 25 0 0 1 0 1 1 0 8 0 kcovpl 48 8 0 0 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 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 454 0 0 29 0 29 29 0 8 0 art_table 40 455 0 0 5 0 5 5 0 8 0 art_node 32 112 0 11 1 0 1 1 0 8 0 sysvmsgpl 40 1 0 1 1 0 1 1 0 8 1 semapl 112 1 0 0 1 0 1 1 0 8 0 shmpl 112 1 0 0 1 0 1 1 0 8 0 dirhash 1024 19 0 2 3 0 3 3 0 8 0 dino2pl 256 1670 0 157 95 0 95 95 0 8 0 ffsino 296 1670 0 157 117 0 117 117 0 8 0 nchpl 144 1938 0 242 64 0 64 64 0 8 0 vnodes 216 1771 0 0 99 0 99 99 0 8 0 namei 1024 5986 0 5986 2 0 2 2 0 8 2 percpumem 16 51 0 1 1 0 1 1 0 8 0 kstatmem 264 28 0 2 2 0 2 2 0 8 0 scxspl 216 6338 0 6337 3 2 1 2 1 8 0 plimitpl 152 38 0 20 1 0 1 1 0 8 0 sigapl 424 496 0 448 7 0 7 7 0 8 1 knotepl 120 303 0 0 10 0 10 10 0 8 0 kqueuepl 224 39 0 29 1 0 1 1 0 8 0 pipepl 344 118 0 91 3 0 3 3 0 8 0 fdescpl 528 479 0 448 3 0 3 3 0 8 0 filepl 160 1964 0 1752 14 0 14 14 0 8 5 lockfpl 104 37 0 35 1 0 1 1 0 8 0 lockfspl 48 18 0 16 1 0 1 1 0 8 0 sessionpl 144 22 0 13 1 0 1 1 0 8 0 pgrppl 48 31 0 14 1 0 1 1 0 8 0 ucredpl 104 188 0 174 1 0 1 1 0 8 0 zombiepl 144 448 0 448 1 0 1 1 0 8 1 processpl 1232 496 0 448 5 0 5 5 0 8 0 procpl 664 584 0 528 6 0 6 6 0 8 1 sosppl 176 1 0 1 1 0 1 1 0 8 1 sockpl 752 247 0 219 10 0 10 10 0 8 7 mcl8k 8192 2 0 0 1 0 1 1 0 8 0 mcl4k 4096 111 0 0 14 0 14 14 0 8 0 mcl2k 2048 37 0 0 5 0 5 5 0 8 0 mtagpl 96 4 0 0 1 0 1 1 0 8 0 mbufpl 256 164 0 0 11 0 11 11 0 8 0 bufpl 280 2420 0 130 164 0 164 164 0 8 0 anonpl 32 3855 0 0 32 0 32 32 0 246 0 amapchunkpl 152 10088 0 9640 21 0 21 21 0 158 3 amappl16 200 1891 0 1866 5 3 2 5 0 8 0 amappl15 192 3 0 3 1 1 0 1 0 8 0 amappl14 184 78 0 77 1 0 1 1 0 8 0 amappl13 176 447 0 446 1 0 1 1 0 8 0 amappl12 168 835 0 794 3 0 3 3 0 8 1 amappl11 160 5 0 5 1 1 0 1 0 8 0 amappl10 152 64 0 49 1 0 1 1 0 8 0 amappl9 144 252 0 251 1 0 1 1 0 8 0 amappl8 136 24 0 22 1 0 1 1 0 8 0 amappl7 128 83 0 82 1 0 1 1 0 8 0 amappl6 120 277 0 264 1 0 1 1 0 8 0 amappl5 112 75 0 65 1 0 1 1 0 8 0 amappl4 104 413 0 383 1 0 1 1 0 8 0 amappl3 96 1604 0 1520 4 1 3 3 0 8 0 amappl2 88 587 0 512 2 0 2 2 0 8 0 amappl1 80 9160 0 8569 14 0 14 14 0 8 1 amappl 88 2940 0 2788 4 0 4 4 0 92 0 uvmvnodes 80 99 0 0 3 0 3 3 0 8 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 3 0 0 1 0 1 1 0 8 0 uaddrrnd 24 479 0 448 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 479 0 448 1 0 1 1 0 8 0 vmmpekpl 168 5674 0 5642 2 0 2 2 0 8 0 vmmpepl 168 38434 0 36555 87 0 87 87 0 357 5 vmsppl 488 478 0 448 5 0 5 5 0 8 1 rwobjpl 80 13798 0 12799 23 0 23 23 0 8 0 pdppl 4096 966 0 896 94 20 74 84 0 8 4 pvpl 32 10237 0 0 83 0 83 83 0 265 0 pmappl 256 478 0 448 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 263 0 22 8 0 8 8 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp ddb{0}> trace x86_ipi_db(ffffffff837d6ff0) 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 mtx_enter(ffffffff8392cab0) at mtx_enter+0x377 sys/kern/kern_lock.c:454 wakeup_n(fffffd806c899238,ffffffff) at wakeup_n+0x54 sys/kern/kern_synch.c:581 sd_buf_done(fffffd806cea7298) at sd_buf_done+0x2de sys/scsi/sd.c:772 scsi_done(fffffd806cea7298) 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(ffff8000337d0af0,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_pc() at __sanitizer_cov_trace_pc+0xf kd_curproc sys/dev/kcov.c:580 [inline] __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0xf sys/dev/kcov.c:153 uvm_pagelookup(fffffd806f083698,5000) at uvm_pagelookup+0x54 uvm_objtree_RBT_FIND sys/uvm/uvm_object.h:93 [inline] uvm_pagelookup(fffffd806f083698,5000) at uvm_pagelookup+0x54 sys/uvm/uvm_page.c:1214 uvn_get(fffffd806f083698,5000,ffff8000337d0f60,ffff8000337d0dc4,3,1,36c185b4c42b9cb7,ffff8000337d1018) at uvn_get+0x486 sys/uvm/uvm_vnode.c:-1 uvm_fault_lower_lookup(ffff8000337d0fe0,ffff8000337d1018,ffff8000337d0f60) at uvm_fault_lower_lookup+0x10d sys/uvm/uvm_fault.c:1206 uvm_fault_lower(ffff8000337d0fe0,ffff8000337d1018,ffff8000337d0f60) at uvm_fault_lower+0x89 sys/uvm/uvm_fault.c:1334 uvm_fault(fffffd806c9913e8,110c238000,0,1) at uvm_fault+0x274 sys/uvm/uvm_fault.c:-1 upageflttrap(ffff8000337d1180,110c238576) at upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:192 usertrap(ffff8000337d1180) at usertrap+0x42f sys/arch/amd64/amd64/trap.c:632 recall_trap() at recall_trap+0x8 end of kernel end trace frame: 0x6fb431426220, count: -19 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(ffff8000299dee30,9,0) at witness_checkorder+0x10d1 sys/kern/subr_witness.c:-1 mtx_enter(ffff8000299dee20) at mtx_enter+0x95 sys/kern/kern_lock.c:406 clockintr_cancel(ffff8000299de2f8) 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(ffff80003c409250,ffff80003b7f7080,ffff80003b7f6fd0) at sys_futex+0xb90 futex_wait sys/kern/sys_futex.c:306 [inline] sys_futex(ffff80003c409250,ffff80003b7f7080,ffff80003b7f6fd0) at sys_futex+0xb90 sys/kern/sys_futex.c:155 syscall(ffff80003b7f7080) at syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003b7f7080) at syscall+0xbd4 sys/arch/amd64/amd64/trap.c:775 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x478cd688040, count: -9