login: witness: lock order reversal: 1st 0xfffffd800872ea28 vmmaplk (&map->lock) 2nd 0xfffffd806969b638 fdlock (&newfdp->fd_fd.fd_lock) lock order "&newfdp->fd_fd.fd_lock"(rwlock) -> "&map->lock"(rwlock) first seen at: #0 rw_enter_read+0x66 sys/kern/kern_rwlock.c:112 #1 uvmfault_lookup+0xd9 sys/uvm/uvm_fault.c:1758 #2 uvm_fault_check+0x3a sys/uvm/uvm_fault.c:674 #3 uvm_fault+0x102 sys/uvm/uvm_fault.c:602 #4 kpageflttrap+0x209 #5 kerntrap+0xef sys/arch/amd64/amd64/trap.c:318 #6 alltraps_kern_meltdown+0x7b #7 copyout+0x53 #8 syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline] #8 syscall+0x489 sys/arch/amd64/amd64/trap.c:585 #9 Xsyscall+0x128 lock order "&map->lock"(rwlock) -> "&newfdp->fd_fd.fd_lock"(rwlock) first seen at: #0 rw_enter_write+0x5b sys/kern/kern_rwlock.c:128 #1 fill_file+0xad2 sys/kern/kern_sysctl.c:1304 #2 sysctl_file+0x62d sys/kern/kern_sysctl.c:1457 #3 kern_sysctl+0xfd sys/kern/kern_sysctl.c:449 #4 sys_sysctl+0x209 sys/kern/kern_sysctl.c:249 #5 syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline] #5 syscall+0x489 sys/arch/amd64/amd64/trap.c:585 #6 Xsyscall+0x128 Stopped at db_enter+0x18: 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+0x18 sys/arch/amd64/amd64/db_interface.c:440 witness_checkorder(fffffd806969b638,9,0) at witness_checkorder+0x10b7 witness_debugger sys/kern/subr_witness.c:2502 [inline] witness_checkorder(fffffd806969b638,9,0) at witness_checkorder+0x10b7 sys/kern/subr_witness.c:1105 rw_enter_write(fffffd806969b628) at rw_enter_write+0x5b sys/kern/kern_rwlock.c:128 fill_file(ffff8000006cf800,fffffd8067d91e50,fffffd806969b5e0,0,0,ffff80002122c018,4a699c72696e6307,2cc,0) at fill_file+0xad2 sys/kern/kern_sysctl.c:1304 sysctl_file(ffff80002e379af8,4,20000080,ffff80002e379b28,ffff80002730aa80) at sysctl_file+0x62d sys/kern/kern_sysctl.c:1457 kern_sysctl(ffff80002e379af4,5,20000080,ffff80002e379b28,0,0,53d538d803d19f05) at kern_sysctl+0xfd sys/kern/kern_sysctl.c:449 sys_sysctl(ffff80002730aa80,ffff80002e379b98,ffff80002e379bf0) at sys_sysctl+0x209 sys/kern/kern_sysctl.c:249 syscall(ffff80002e379c60) at syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff80002e379c60) at syscall+0x489 sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x6dc299bda20, count: -9 ddb{1}> show registers rdi 0x3 rsi 0x40000 acpi_pdirpa+0x2be68 rbp 0xffff80002e379460 rbx 0x3 rdx 0xffff800000bcb040 rcx 0 rax 0x3ffff acpi_pdirpa+0x2be67 r8 0xffff80002e3793d0 r9 0x8080808080808080 r10 0xb4e9b246bb6f55bc r11 0x9e73b6cfd849d030 r12 0xffffffff82aac0d0 w_lodata+0x4e760 r13 0 r14 0xffffffff82aa5380 w_lodata+0x47a10 r15 0xfffffd8002f62c80 rip 0xffffffff8138d658 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff80002e379450 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{1}> show proc PROC (syz-executor.4) pid=211164 stat=onproc flags process=10 proc=4000000 pri=32, usrpri=67, nice=20 forw=0xffffffffffffffff, list=0xffff80002730ba40,0xffff80002730a2b0 process=0xffff80002122edd0 user=0xffff80002e374000, vmspace=0xfffffd800872ea10 estcpu=17, cpticks=0, pctcpu=0.0 user=0, sys=0, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 58395 203138 12600 32767 2 0x10 syz-executor.7 58395 39065 12600 32767 3 0x4000090 fsleep syz-executor.7 14009 151393 33627 32767 2 0x10 syz-executor.4 *14009 211164 33627 32767 7 0x4000010 syz-executor.4 61007 315371 90794 32767 2 0x10 syz-executor.2 47880 478679 28976 32767 2 0x10 syz-executor.1 47880 237817 28976 32767 3 0x4000010 biowait syz-executor.1 90352 407581 34407 32767 2 0x10 syz-executor.5 85342 472437 7447 32767 7 0x10 syz-executor.6 39261 29023 84940 32767 2 0x10 syz-executor.0 39261 321701 84940 32767 3 0x4000090 fsleep syz-executor.0 52997 519667 73857 32767 2 0x10 syz-executor.3 52997 417956 73857 32767 3 0x4000090 fsleep syz-executor.3 52997 67771 73857 32767 3 0x4000090 fsleep syz-executor.3 52997 463639 73857 32767 3 0x4000090 fsleep syz-executor.3 84940 15720 17967 32767 3 0x90 nanoslp syz-executor.0 17967 110026 18253 0 3 0x82 wait syz-executor.0 7447 33509 86525 32767 3 0x90 nanoslp syz-executor.6 86525 430529 18253 0 3 0x82 wait syz-executor.6 28976 327189 96227 32767 3 0x90 nanoslp syz-executor.1 96227 381105 18253 0 3 0x82 wait syz-executor.1 57001 238745 0 0 3 0x14200 bored sosplice 12600 317921 94353 32767 3 0x90 nanoslp syz-executor.7 34407 370624 5578 32767 3 0x90 nanoslp syz-executor.5 94353 113414 18253 0 3 0x82 wait syz-executor.7 33627 251830 21650 32767 3 0x90 nanoslp syz-executor.4 73857 508002 21366 32767 3 0x90 nanoslp syz-executor.3 5578 314591 18253 0 3 0x82 wait syz-executor.5 90794 177158 10626 32767 3 0x90 nanoslp syz-executor.2 21650 52384 18253 0 3 0x82 wait syz-executor.4 21366 45216 18253 0 3 0x82 wait syz-executor.3 10626 102194 18253 0 3 0x82 wait syz-executor.2 18253 323622 32711 0 3 0x82 kqread syz-fuzzer 18253 251751 32711 0 3 0x4000082 thrsleep syz-fuzzer 18253 28452 32711 0 3 0x4000082 thrsleep syz-fuzzer 18253 191279 32711 0 3 0x4000082 thrsleep syz-fuzzer 18253 131981 32711 0 3 0x4000082 thrsleep syz-fuzzer 18253 461565 32711 0 3 0x4000082 thrsleep syz-fuzzer 18253 142737 32711 0 3 0x4000082 thrsleep syz-fuzzer 18253 174405 32711 0 3 0x4000082 thrsleep syz-fuzzer 32711 199779 57894 0 3 0x10008a sigsusp ksh 57894 396241 40757 0 3 0x9a kqread sshd 32529 425801 1 0 3 0x100083 ttyin getty 40757 363388 1 0 3 0x88 kqread sshd 12055 127012 52139 73 3 0x1100090 kqread syslogd 52139 397106 1 0 3 0x100082 netio syslogd 76180 420765 1 0 3 0x100080 kqread resolvd 42317 362572 80292 77 3 0x100092 kqread dhcpleased 33689 357089 80292 77 3 0x100092 kqread dhcpleased 80292 391366 1 0 3 0x80 kqread dhcpleased 38383 388378 0 0 3 0x14200 bored smr 62332 494516 0 0 2 0x14200 zerothread 7782 514330 0 0 3 0x14200 aiodoned aiodoned 99006 376975 0 0 3 0x14200 syncer update 19358 337618 0 0 3 0x14200 cleaner cleaner 16387 502777 0 0 3 0x14200 reaper reaper 26810 198569 0 0 3 0x14200 pgdaemon pagedaemon 36479 17126 0 0 3 0x14200 bored viomb 64139 517504 0 0 3 0x40014200 acpi0 acpi0 21557 382660 0 0 3 0x40014200 idle1 18249 327261 0 0 3 0x14200 bored softnet 71012 163435 0 0 3 0x14200 bored systqmp 7992 382325 0 0 3 0x14200 bored systq 86129 476515 0 0 3 0x40014200 bored softclock 89864 479381 0 0 3 0x40014200 idle0 1 143853 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks Process 14009 (syz-executor.4) thread 0xffff80002730aa80 (211164) shared rwlock vmmaplk r = 0 (0xfffffd800872ea28) #0 witness_lock+0x44d #1 uvm_vslock+0xc8 sys/uvm/uvm_glue.c:129 #2 sys_sysctl+0x2d8 sys/kern/kern_sysctl.c:240 #3 syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline] #3 syscall+0x489 sys/arch/amd64/amd64/trap.c:585 #4 Xsyscall+0x128 exclusive rwlock sysctllk r = 0 (0xffffffff82941f10) #0 witness_lock+0x44d #1 rw_enter+0x3e1 sys/kern/kern_rwlock.c:310 #2 sys_sysctl+0x1b3 sys/kern/kern_sysctl.c:233 #3 syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline] #3 syscall+0x489 sys/arch/amd64/amd64/trap.c:585 #4 Xsyscall+0x128 exclusive kernel_lock &kernel_lock r = 0 (0xffffffff829de988) #0 witness_lock+0x44d #1 syscall+0x3ef mi_syscall sys/sys/syscall_mi.h:93 [inline] #1 syscall+0x3ef sys/arch/amd64/amd64/trap.c:585 #2 Xsyscall+0x128 Process 47880 (syz-executor.1) thread 0xffff80002730ad20 (237817) exclusive rrwlock inode r = 0 (0xfffffd8074df0700) #0 witness_lock+0x44d #1 rw_enter+0x3e1 sys/kern/kern_rwlock.c:310 #2 rrw_enter+0x8b sys/kern/kern_rwlock.c:461 #3 VOP_LOCK+0x87 sys/kern/vfs_vops.c:534 #4 ufs_ihashins+0x42 sys/ufs/ufs/ufs_ihash.c:140 #5 ffs_vget+0x141 sys/ufs/ffs/ffs_vfsops.c:1347 #6 ffs_inode_alloc+0x1be sys/ufs/ffs/ffs_alloc.c:394 #7 ufs_makeinode+0xae sys/ufs/ufs/ufs_vnops.c:1830 #8 ufs_create+0x41 sys/ufs/ufs/ufs_vnops.c:152 #9 VOP_CREATE+0xbc sys/kern/vfs_vops.c:103 #10 vn_open+0x28f sys/kern/vfs_vnops.c:122 #11 doopenat+0x26a sys/kern/vfs_syscalls.c:1129 #12 syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline] #12 syscall+0x489 sys/arch/amd64/amd64/trap.c:585 #13 Xsyscall+0x128 exclusive rrwlock inode r = 0 (0xfffffd8074df04e0) #0 witness_lock+0x44d #1 rw_enter+0x3e1 sys/kern/kern_rwlock.c:310 #2 rrw_enter+0x8b sys/kern/kern_rwlock.c:461 #3 VOP_LOCK+0x87 sys/kern/vfs_vops.c:534 #4 vn_lock+0x84 sys/kern/vfs_vnops.c:579 #5 vfs_lookup+0xd1 sys/kern/vfs_lookup.c:413 #6 namei+0x36a sys/kern/vfs_lookup.c:245 #7 vn_open+0x188 sys/kern/vfs_vnops.c:113 #8 doopenat+0x26a sys/kern/vfs_syscalls.c:1129 #9 syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline] #9 syscall+0x489 sys/arch/amd64/amd64/trap.c:585 #10 Xsyscall+0x128 Process 85342 (syz-executor.6) thread 0xffff8000211fe540 (472437) shared rwlock vmmaplk r = 0 (0xfffffd8067571480) #0 witness_lock+0x44d #1 uvmfault_lookup+0xd9 sys/uvm/uvm_fault.c:1758 #2 uvm_fault_check+0x3a sys/uvm/uvm_fault.c:674 #3 uvm_fault+0x102 sys/uvm/uvm_fault.c:602 #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{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10192 6410K 6419K 78643K 11301 0 pcb 13 12K 14K 78643K 17 0 rtable 250 7K 7K 78643K 707 0 ifaddr 81 17K 17K 78643K 125 0 sysctl 2 0K 0K 78643K 2 0 counters 56 35K 35K 78643K 68 0 ioctlops 0 0K 2K 78643K 56 0 iov 0 0K 12K 78643K 437 0 mount 1 1K 1K 78643K 1 0 log 0 0K 0K 78643K 5 0 vnodes 1270 79K 79K 78643K 1960 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 9K 78643K 40 0 VM map 2 1K 1K 78643K 2 0 sem 12 0K 0K 78643K 688 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1697 195K 286K 78643K 12548 0 file desc 26 97K 125K 78643K 2367 0 sigio 0 0K 0K 78643K 9 0 proc 56 74K 111K 78643K 796 0 subproc 104 6K 6K 78643K 182 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 ip_moptions 0 0K 0K 78643K 327 0 in_multi 99 6K 7K 78643K 226 0 ether_multi 1 0K 0K 78643K 13 0 mrt 1 0K 0K 78643K 2 0 ISOFS mount 1 32K 32K 78643K 1 0 MSDOSFS mount 1 16K 16K 78643K 1 0 ttys 169 758K 758K 78643K 169 0 exec 0 0K 2K 78643K 868 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 352 85K 102K 78643K 31197 0 UVM aobj 131 4K 4K 78643K 143 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 0K 78643K 73 0 NDP 11 0K 2K 78643K 45 0 temp 126 4708K 4771K 78643K 10209 0 kqueue 14 20K 24K 78643K 235 0 SYN cache 2 16K 16K 78643K 2 0 ddb{1}> 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 120 246 0 243 4 3 1 3 0 8 0 rtentry 112 184 0 68 4 0 4 4 0 8 0 unpcb 136 1727 0 1714 14 13 1 6 0 8 0 syncache 296 21 0 21 4 4 0 1 0 8 0 tcpqe 32 546 0 546 5 5 0 3 0 8 0 tcpcb 736 1956 0 1947 54 50 4 20 0 8 1 arp 120 30 0 12 1 0 1 1 0 8 0 ipq 40 3 0 2 1 0 1 1 0 8 0 ipqe 40 42 0 41 1 0 1 1 0 8 0 inpcb 304 3011 0 2999 39 36 3 14 0 8 1 ip6q 72 8 0 7 1 0 1 1 0 8 0 ip6af 40 14 0 13 1 0 1 1 0 8 0 nd6 48 49 0 19 1 0 1 1 0 8 0 kcovpl 48 14 0 6 1 0 1 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 745 0 269 30 0 30 30 0 8 0 art_table 32 746 0 269 4 0 4 4 0 8 0 art_node 16 183 0 77 1 0 1 1 0 8 0 sysvmsgpl 40 2 0 0 1 0 1 1 0 8 0 semupl 112 2 0 2 1 1 0 1 0 8 0 semapl 112 617 0 607 1 0 1 1 0 8 0 shmpl 112 140 0 12 4 0 4 4 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 4598 0 3167 90 0 90 90 0 8 0 ffsino 272 4598 0 3167 96 0 96 96 0 8 0 nchpl 144 8264 0 6637 62 0 62 62 0 8 0 uvmvnodes 80 4789 0 0 98 0 98 98 0 8 0 vnodes 224 4789 0 0 282 0 282 282 0 8 0 namei 1024 28500 0 28499 2 1 1 2 0 8 0 percpumem 16 46 0 6 1 0 1 1 0 8 0 scxspl 216 21410 0 21409 15 14 1 8 0 8 0 plimitpl 152 325 0 303 1 0 1 1 0 8 0 sigapl 424 2629 0 2577 7 1 6 7 0 8 0 futexpl 64 19045 0 19040 2 1 1 1 0 8 0 knotepl 120 142 0 0 4 0 4 4 0 8 0 kqueuepl 216 849 0 839 12 11 1 5 0 8 0 pipepl 336 1042 0 1013 27 24 3 13 0 8 0 fdescpl 496 2614 0 2577 7 2 5 6 0 8 0 filepl 152 19657 0 19420 35 25 10 19 0 8 0 lockfpl 104 294 0 292 1 0 1 1 0 8 0 lockfspl 48 95 0 93 1 0 1 1 0 8 0 sessionpl 144 29 0 13 1 0 1 1 0 8 0 pgrppl 48 35 0 19 1 0 1 1 0 8 0 ucredpl 96 3103 0 3085 1 0 1 1 0 8 0 zombiepl 144 2577 0 2577 1 0 1 1 0 8 1 processpl 1064 2629 0 2577 5 1 4 4 0 8 0 procpl 672 6779 0 6713 8 1 7 7 0 8 1 sosppl 168 33 0 33 5 4 1 1 0 8 1 sockpl 480 5012 0 4984 97 86 11 24 0 8 6 mcl64k 65536 15 0 0 2 0 2 2 0 8 0 mcl16k 16384 14 0 0 2 0 2 2 0 8 0 mcl12k 12288 11 0 0 2 0 2 2 0 8 0 mcl9k 9216 5 0 0 1 0 1 1 0 8 0 mcl8k 8192 21 0 0 3 1 2 3 0 8 0 mcl4k 4096 17 0 0 3 0 3 3 0 8 0 mcl2k2 2112 5 0 0 1 0 1 1 0 8 0 mcl2k 2048 376 0 0 47 0 47 47 0 8 0 mtagpl 96 3 0 0 1 0 1 1 0 8 0 mbufpl 256 668 0 0 38 0 38 38 0 8 0 bufpl 288 6852 0 517 453 0 453 453 0 8 0 anonpl 24 755357 0 741082 164 45 119 120 0 186 15 amapchunkpl 152 77062 0 76290 64 29 35 45 0 158 2 amappl16 200 9655 0 9260 64 32 32 34 0 8 8 amappl15 192 1071 0 1062 1 0 1 1 0 8 0 amappl14 184 1004 0 995 1 0 1 1 0 8 0 amappl13 176 144 0 143 1 0 1 1 0 8 0 amappl12 168 274 0 267 1 0 1 1 0 8 0 amappl11 160 271 0 260 1 0 1 1 0 8 0 amappl10 152 91 0 84 1 0 1 1 0 8 0 amappl9 144 691 0 686 1 0 1 1 0 8 0 amappl8 136 739 0 665 3 0 3 3 0 8 0 amappl7 128 151 0 138 1 0 1 1 0 8 0 amappl6 120 474 0 449 2 1 1 2 0 8 0 amappl5 112 1686 0 1665 1 0 1 1 0 8 0 amappl4 104 1810 0 1776 2 0 2 2 0 8 0 amappl3 96 578 0 563 1 0 1 1 0 8 0 amappl2 88 976 0 932 3 1 2 3 0 8 0 amappl1 80 51016 0 50370 19 4 15 18 0 8 0 amappl 88 30611 0 30343 7 0 7 7 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 72 142 0 12 3 0 3 3 0 8 0 uaddrrnd 24 2614 0 2577 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 2614 0 2577 1 0 1 1 0 8 0 vmmpekpl 168 26430 0 26376 4 0 4 4 0 8 0 vmmpepl 168 245211 0 242476 165 32 133 134 0 357 14 vmsppl 368 2613 0 2577 4 0 4 4 0 8 0 rwobjpl 56 67618 0 61343 93 1 92 92 0 8 1 pdppl 4096 5235 0 5154 179 98 81 95 0 8 0 pvpl 32 1314980 0 1295398 294 92 202 248 0 265 31 pmappl 248 2613 0 2577 4 1 3 3 0 8 0 extentpl 40 58 0 38 1 0 1 1 0 8 0 phpool 112 1037 0 176 25 0 25 25 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x1a: addq $0x8,%rsp ddb{0}> trace x86_ipi_db(ffffffff829baff0) 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(ffffffff829de780) at __mp_lock+0x120 __mp_lock_spin sys/kern/kern_lock.c:117 [inline] __mp_lock(ffffffff829de780) at __mp_lock+0x120 sys/kern/kern_lock.c:147 intr_handler(ffff800029522ef0,ffff800000077500) at intr_handler+0x5e sys/arch/amd64/amd64/intr.c:532 Xintr_ioapic_edge16_untramp() at Xintr_ioapic_edge16_untramp+0x18f __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(ffffffff829de780) at __mp_lock+0x133 __mp_lock_spin sys/kern/kern_lock.c:116 [inline] __mp_lock(ffffffff829de780) at __mp_lock+0x133 sys/kern/kern_lock.c:147 intr_handler(ffff800029523050,ffff80000004ad00) at intr_handler+0x5e sys/arch/amd64/amd64/intr.c:532 Xintr_ioapic_edge21_untramp() at Xintr_ioapic_edge21_untramp+0x18f witness_unlock(fffffd8067571480,0) at witness_unlock+0x49 sys/kern/subr_witness.c:1281 rw_exit_read(fffffd8067571470) at rw_exit_read+0x68 sys/kern/kern_rwlock.c:140 uvm_fault_upper(ffff800029523360,ffff800029523398,ffff800029523260,0) at uvm_fault_upper+0x377 sys/uvm/uvm_fault.c:1095 uvm_fault(fffffd8067571468,7831a910000,0,1) at uvm_fault+0x164 sys/uvm/uvm_fault.c:610 upageflttrap(ffff8000295234d0,7831a910014) at upageflttrap+0x82 sys/arch/amd64/amd64/trap.c:181 usertrap(ffff8000295234d0) at usertrap+0x1aa sys/arch/amd64/amd64/trap.c:403 recall_trap() at recall_trap+0x8 end of kernel end trace frame: 0x7f7ffffd4220, count: -17 ddb{0}> machine ddbcpu 1 Stopped at db_enter+0x18: addq $0x8,%rsp ddb{1}> trace db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:440 witness_checkorder(fffffd806969b638,9,0) at witness_checkorder+0x10b7 witness_debugger sys/kern/subr_witness.c:2502 [inline] witness_checkorder(fffffd806969b638,9,0) at witness_checkorder+0x10b7 sys/kern/subr_witness.c:1105 rw_enter_write(fffffd806969b628) at rw_enter_write+0x5b sys/kern/kern_rwlock.c:128 fill_file(ffff8000006cf800,fffffd8067d91e50,fffffd806969b5e0,0,0,ffff80002122c018,4a699c72696e6307,2cc,0) at fill_file+0xad2 sys/kern/kern_sysctl.c:1304 sysctl_file(ffff80002e379af8,4,20000080,ffff80002e379b28,ffff80002730aa80) at sysctl_file+0x62d sys/kern/kern_sysctl.c:1457 kern_sysctl(ffff80002e379af4,5,20000080,ffff80002e379b28,0,0,53d538d803d19f05) at kern_sysctl+0xfd sys/kern/kern_sysctl.c:449 sys_sysctl(ffff80002730aa80,ffff80002e379b98,ffff80002e379bf0) at sys_sysctl+0x209 sys/kern/kern_sysctl.c:249 syscall(ffff80002e379c60) at syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff80002e379c60) at syscall+0x489 sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x6dc299bda20, count: -9