panic: mtx 0xffffffff83987ea0: locking against myself Stopped at db_enter+0x25: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND 372472 90863 32767 0x10 0 1 syz-executor *276713 86430 32767 0x10 0 0 syz-executor db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff833dc301) at panic+0x1e5 sys/kern/subr_prf.c:198 mtx_enter_try(ffffffff83987ea0) at mtx_enter_try+0x1bf sys/kern/kern_lock.c:271 mtx_enter(ffffffff83987ea0) at mtx_enter+0x60 sys/kern/kern_lock.c:239 uvm_pageclean(fffffd800877b4d0) at uvm_pageclean+0x290 uvm_pagedequeue sys/uvm/uvm_page.c:-1 [inline] uvm_pageclean(fffffd800877b4d0) at uvm_pageclean+0x290 sys/uvm/uvm_page.c:980 uvm_pagefree(fffffd800877b4d0) at uvm_pagefree+0x26 sys/uvm/uvm_page.c:1020 uvn_get(fffffd806b118ad0,0,ffff800039805e68,ffff800039805e44,0,2,477d43580812e692,ffff8000398060c0) at uvn_get+0x68b sys/uvm/uvm_vnode.c:1118 uvm_fault_lower_io(ffff800039806088,ffff8000398060c0,ffff800039805ef0,ffff800039805ef8) at uvm_fault_lower_io+0x319 sys/uvm/uvm_fault.c:1588 uvm_fault_lower(ffff800039806088,ffff8000398060c0,ffff800039806000) at uvm_fault_lower+0x278 sys/uvm/uvm_fault.c:1362 uvm_fault(fffffd806b579d40,200000000000,0,2) at uvm_fault+0x272 sys/uvm/uvm_fault.c:-1 upageflttrap(ffff800039806210,200000000100) at upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:188 usertrap(ffff800039806210) at usertrap+0x2d8 sys/arch/amd64/amd64/trap.c:436 recall_trap() at recall_trap+0x8 end of kernel end trace frame: 0x788990dc52b0, count: 2 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: mtx 0xffffffff83987ea0: locking against myself ddb{0}> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff833dc301) at panic+0x1e5 sys/kern/subr_prf.c:198 mtx_enter_try(ffffffff83987ea0) at mtx_enter_try+0x1bf sys/kern/kern_lock.c:271 mtx_enter(ffffffff83987ea0) at mtx_enter+0x60 sys/kern/kern_lock.c:239 uvm_pageclean(fffffd800877b4d0) at uvm_pageclean+0x290 uvm_pagedequeue sys/uvm/uvm_page.c:-1 [inline] uvm_pageclean(fffffd800877b4d0) at uvm_pageclean+0x290 sys/uvm/uvm_page.c:980 uvm_pagefree(fffffd800877b4d0) at uvm_pagefree+0x26 sys/uvm/uvm_page.c:1020 uvn_get(fffffd806b118ad0,0,ffff800039805e68,ffff800039805e44,0,2,477d43580812e692,ffff8000398060c0) at uvn_get+0x68b sys/uvm/uvm_vnode.c:1118 uvm_fault_lower_io(ffff800039806088,ffff8000398060c0,ffff800039805ef0,ffff800039805ef8) at uvm_fault_lower_io+0x319 sys/uvm/uvm_fault.c:1588 uvm_fault_lower(ffff800039806088,ffff8000398060c0,ffff800039806000) at uvm_fault_lower+0x278 sys/uvm/uvm_fault.c:1362 uvm_fault(fffffd806b579d40,200000000000,0,2) at uvm_fault+0x272 sys/uvm/uvm_fault.c:-1 upageflttrap(ffff800039806210,200000000100) at upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:188 usertrap(ffff800039806210) at usertrap+0x2d8 sys/arch/amd64/amd64/trap.c:436 recall_trap() at recall_trap+0x8 end of kernel end trace frame: 0x788990dc52b0, count: -13 ddb{0}> show registers rdi 0 rsi 0x1 rbp 0xffff800039805bb0 rbx 0xffffffff83828dcf cpu_info_full_primary+0x2dcf rdx 0 rcx 0xffff8000ffff0cf0 rax 0xffffffff83827ff0 cpu_info_full_primary+0x1ff0 r8 0x101010101010101 r9 0x8080808080808080 r10 0xac928ad9f20d220e r11 0x90a8d0058aea0f5c r12 0xffffffff83828bd0 cpu_info_full_primary+0x2bd0 r13 0 r14 0 r15 0x1 rip 0xffffffff82d2f565 db_enter+0x25 cs 0x8 rflags 0x246 rsp 0xffff800039805ba0 ss 0 db_enter+0x25: addq $0x8,%rsp ddb{0}> show proc PROC (syz-executor) tid=276713 pid=86430 tcnt=4 stat=onproc flags process=10 proc=0 runpri=50, usrpri=50, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff8000ffff1730,0xffff8000ffff14b0 process=0xffff80003b4204c8 user=0xffff800039801000, vmspace=0xfffffd806b579d40 estcpu=9, cpticks=3, pctcpu=0.0, user=3, sys=0, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 90863 372472 57914 32767 7 0x10 syz-executor 90863 183589 57914 32767 3 0x4000090 fsleep syz-executor 8963 170639 71942 32767 2 0x10 syz-executor 8963 243798 71942 32767 3 0x4000090 fsleep syz-executor *86430 276713 64991 32767 7 0x10 syz-executor 86430 375601 64991 32767 3 0x4000090 fsleep syz-executor 86430 100900 64991 32767 3 0x4000010 biowait syz-executor 86430 181730 64991 32767 3 0x4000090 fsleep syz-executor 75978 507120 81803 32767 2 0x10 syz-executor 75978 193277 81803 32767 3 0x4000090 sbwait syz-executor 75978 425069 81803 32767 3 0x4000090 fsleep syz-executor 93262 17094 71350 32767 2 0x10 syz-executor 93262 321446 71350 32767 3 0x4000090 fsleep syz-executor 3688 33740 74157 0 2 0x100000 sh 87984 132240 24028 0 2 0x100002 arp 74157 515153 59528 0 3 0x10008a sigsusp sh 24028 402105 87465 0 3 0x10008a sigsusp sh 59528 132261 93177 0 3 0x80 wait syz-executor 64991 361807 85773 32767 3 0x90 nanoslp syz-executor 17243 195926 74554 32767 2 0x10 syz-executor 87465 124094 18120 0 3 0x80 wait syz-executor 71942 313603 8166 32767 3 0x90 nanoslp syz-executor 71350 460206 47817 32767 3 0x90 nanoslp syz-executor 81803 353123 79423 32767 3 0x90 nanoslp syz-executor 57914 418526 4870 32767 3 0x90 nanoslp syz-executor 85773 102319 15682 0 3 0x82 wait syz-executor 79423 51682 15682 0 3 0x82 wait syz-executor 18120 414684 15682 0 3 0x82 wait syz-executor 93177 216453 15682 0 3 0x82 wait syz-executor 8166 138675 15682 0 3 0x82 wait syz-executor 74554 187096 15682 0 3 0x82 wait syz-executor 47817 381175 15682 0 3 0x82 wait syz-executor 4870 101851 15682 0 3 0x82 wait syz-executor 15682 261672 37403 0 3 0x82 kqread syz-executor 37403 53314 29197 0 3 0x10008a sigsusp ksh 29197 125752 2132 0 3 0x98 kqread sshd-session 2132 138663 83489 0 3 0x92 kqread sshd-session 20649 7867 1 0 3 0x100083 ttyin getty 83489 404718 1 0 3 0x88 kqread sshd 21964 495996 58431 73 3 0x1100090 kqread syslogd 58431 463469 1 0 3 0x100082 sbwait syslogd 42088 372351 1 0 3 0x100080 kqread resolvd 34943 435574 27712 77 3 0x100092 kqread dhcpleased 71149 236640 27712 77 3 0x100092 kqread dhcpleased 27712 406661 1 0 3 0x80 kqread dhcpleased 26577 275763 0 0 3 0x14200 bored smr 73786 159888 0 0 2 0x14200 zerothread 11746 280538 0 0 3 0x14200 aiodoned aiodoned 8700 159714 0 0 3 0x14200 syncer update 41290 451750 0 0 3 0x14200 cleaner cleaner 70982 511377 0 0 3 0x14200 reaper reaper 27721 138743 0 0 3 0x14200 pgdaemon pagedaemon 83579 76854 0 0 3 0x14200 bored viomb 76245 60999 0 0 3 0x40014200 acpi0 acpi0 67886 477510 0 0 3 0x40014200 idle1 18547 462397 0 0 3 0x14200 bored softnet3 21922 321226 0 0 3 0x14200 bored softnet2 79093 149854 0 0 3 0x14200 bored softnet1 36740 429754 0 0 3 0x14200 bored softnet0 47446 396815 0 0 3 0x14200 bored systqmp 47086 466496 0 0 3 0x14200 bored systq 11794 457888 0 0 3 0x14200 tmoslp softclockmp 42948 501385 0 0 3 0x40014200 tmoslp softclock 39702 93737 0 0 3 0x40014200 idle0 1 295596 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks CPU 0: exclusive mutex &uvm.pageqlock r = 0 (0xffffffff83987eb0) #0 witness_lock+0x5bb stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5bb sys/kern/subr_witness.c:1160 #1 mtx_enter_try+0x178 sys/kern/kern_lock.c:-1 #2 mtx_enter+0x60 sys/kern/kern_lock.c:239 #3 uvn_get+0x679 sys/uvm/uvm_vnode.c:1117 #4 uvm_fault_lower_io+0x319 sys/uvm/uvm_fault.c:1588 #5 uvm_fault_lower+0x278 sys/uvm/uvm_fault.c:1362 #6 uvm_fault+0x272 sys/uvm/uvm_fault.c:-1 #7 upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:188 #8 usertrap+0x2d8 sys/arch/amd64/amd64/trap.c:436 #9 recall_trap+0x8 Process 86430 (syz-executor) thread 0xffff8000ffff0cf0 (276713) exclusive rwlock uobjlk r = 0 (0xfffffd806ad916a0) #0 witness_lock+0x5bb stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5bb sys/kern/subr_witness.c:1160 #1 rw_do_enter_write+0x3ea sys/kern/kern_rwlock.c:316 #2 uvn_io+0x667 sys/uvm/uvm_vnode.c:1297 #3 uvn_get+0x31d sys/uvm/uvm_vnode.c:1102 #4 uvm_fault_lower_io+0x319 sys/uvm/uvm_fault.c:1588 #5 uvm_fault_lower+0x278 sys/uvm/uvm_fault.c:1362 #6 uvm_fault+0x272 sys/uvm/uvm_fault.c:-1 #7 upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:188 #8 usertrap+0x2d8 sys/arch/amd64/amd64/trap.c:436 #9 recall_trap+0x8 exclusive mutex &uvm.pageqlock r = 0 (0xffffffff83987eb0) #0 witness_lock+0x5bb stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5bb sys/kern/subr_witness.c:1160 #1 mtx_enter_try+0x178 sys/kern/kern_lock.c:-1 #2 mtx_enter+0x60 sys/kern/kern_lock.c:239 #3 uvn_get+0x679 sys/uvm/uvm_vnode.c:1117 #4 uvm_fault_lower_io+0x319 sys/uvm/uvm_fault.c:1588 #5 uvm_fault_lower+0x278 sys/uvm/uvm_fault.c:1362 #6 uvm_fault+0x272 sys/uvm/uvm_fault.c:-1 #7 upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:188 #8 usertrap+0x2d8 sys/arch/amd64/amd64/trap.c:436 #9 recall_trap+0x8 Process 86430 (syz-executor) thread 0xffff8000ffff02b0 (375601) exclusive rwlock futexpl r = 0 (0xffffffff838ff1e8) #0 witness_lock+0x5bb stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5bb sys/kern/subr_witness.c:1160 #1 rw_do_enter_write+0x3ea sys/kern/kern_rwlock.c:316 #2 pool_get+0x10b sys/kern/subr_pool.c:583 #3 futex_get+0x309 sys/kern/sys_futex.c:171 #4 futex_wait+0x328 sys/kern/sys_futex.c:-1 #5 sys_futex+0x149 sys/kern/sys_futex.c:101 #6 syscall+0xbc6 mi_syscall sys/sys/syscall_mi.h:176 [inline] #6 syscall+0xbc6 sys/arch/amd64/amd64/trap.c:577 #7 Xsyscall+0x128 exclusive rwlock futex r = 0 (0xffffffff8380b698) #0 witness_lock+0x5bb stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5bb sys/kern/subr_witness.c:1160 #1 rw_do_enter_write+0x3ea sys/kern/kern_rwlock.c:316 #2 sys_futex+0x69 sys/kern/sys_futex.c:98 #3 syscall+0xbc6 mi_syscall sys/sys/syscall_mi.h:176 [inline] #3 syscall+0xbc6 sys/arch/amd64/amd64/trap.c:577 #4 Xsyscall+0x128 Process 86430 (syz-executor) thread 0xffff80002a2ba538 (100900) exclusive rrwlock inode r = 0 (0xfffffd806b38f200) #0 witness_lock+0x5bb stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5bb sys/kern/subr_witness.c:1160 #1 rw_do_enter_write+0x3ea sys/kern/kern_rwlock.c:316 #2 rrw_enter+0xc6 sys/kern/kern_rwlock.c:616 #3 VOP_LOCK+0xa6 sys/kern/vfs_vops.c:524 #4 vn_lock+0xa4 sys/kern/vfs_vnops.c:570 #5 sys_ftruncate+0x1c4 sys/kern/vfs_syscalls.c:2920 #6 syscall+0xb08 mi_syscall sys/sys/syscall_mi.h:176 [inline] #6 syscall+0xb08 sys/arch/amd64/amd64/trap.c:577 #7 Xsyscall+0x128 ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10177 10953K 10965K 166960K 11254 0 pcb 17 12K 12K 166960K 17 0 rtable 196 5K 5K 166960K 290 0 pf 31 16K 16K 166960K 31 0 ifaddr 37 6K 6K 166960K 39 0 ifgroup 50 2K 2K 166960K 50 0 sysctl 1 1K 1K 166960K 1 0 counters 64 36K 36K 166960K 64 0 ioctlops 0 0K 2K 166960K 27 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1334 84K 84K 166960K 1350 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 1K 166960K 2 0 VM map 2 1K 1K 166960K 2 0 sem 2 0K 0K 166960K 2 0 dirhash 12 2K 2K 166960K 12 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 27 101K 121K 166960K 133 0 proc 58 79K 127K 166960K 452 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 2 0 in_multi 78 5K 5K 166960K 78 0 ether_multi 1 0K 0K 166960K 1 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 25 122K 122K 166960K 25 0 exec 0 0K 1K 166960K 325 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 245 163K 169K 166960K 2622 0 UVM aobj 3 2K 2K 166960K 3 0 pinsyscall 49 98K 110K 166960K 1100 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 NDP 23 1K 1K 166960K 23 0 temp 34 8678K 8740K 166960K 3506 0 kqueue 13 20K 20K 166960K 22 0 SYN cache 2 16K 16K 166960K 2 0 ddb{0}> 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 30 0 26 1 0 1 1 0 8 0 rtentry 176 92 0 1 5 0 5 5 0 8 0 unpcb 144 161 0 16 6 0 6 6 0 8 0 syncache 336 3 0 3 1 0 1 1 0 8 1 tcpcb 808 9 0 3 1 0 1 1 0 8 0 arp 128 15 0 0 1 0 1 1 0 8 0 inpcb 384 56 0 47 2 0 2 2 0 8 1 nd6 144 18 0 0 1 0 1 1 0 8 0 kcovpl 48 8 0 0 1 0 1 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 368 0 0 23 0 23 23 0 8 0 art_table 32 369 0 0 3 0 3 3 0 8 0 art_node 16 91 0 8 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 1544 0 40 94 0 94 94 0 8 0 ffsino 288 1544 0 40 108 0 108 108 0 8 0 nchpl 144 1724 0 46 63 0 63 63 0 8 0 uvmvnodes 80 1625 0 0 34 0 34 34 0 8 0 vnodes 216 1625 0 0 91 0 91 91 0 8 0 namei 1024 4936 0 4936 2 0 2 2 0 8 2 percpumem 16 47 0 0 1 0 1 1 0 8 0 kstatmem 264 22 0 0 2 0 2 2 0 8 0 scxspl 216 5679 0 5677 3 1 2 2 1 8 1 plimitpl 152 34 0 10 1 0 1 1 0 8 0 sigapl 424 403 0 346 8 0 8 8 0 8 0 futexpl 64 30 0 24 1 0 1 1 0 8 0 knotepl 120 50 0 0 2 0 2 2 0 8 0 kqueuepl 224 18 0 9 1 0 1 1 0 8 0 pipepl 336 95 0 68 3 0 3 3 0 8 0 fdescpl 520 385 0 346 3 0 3 3 0 8 0 filepl 160 1395 0 1055 15 0 15 15 0 8 0 lockfpl 104 7 0 4 1 0 1 1 0 8 0 lockfspl 48 5 0 2 1 0 1 1 0 8 0 sessionpl 144 21 0 5 1 0 1 1 0 8 0 pgrppl 48 29 0 5 1 0 1 1 0 8 0 ucredpl 104 81 0 64 1 0 1 1 0 8 0 zombiepl 144 346 0 346 1 0 1 1 0 8 1 processpl 1192 403 0 346 5 0 5 5 0 8 0 procpl 656 411 0 346 6 0 6 6 0 8 0 sockpl 728 247 0 89 15 0 15 15 0 8 0 mcl8k 8192 3 0 0 1 0 1 1 0 8 0 mcl4k 4096 121 0 0 16 0 16 16 0 8 0 mcl2k 2048 13 0 0 2 0 2 2 0 8 0 mtagpl 96 1 0 0 1 0 1 1 0 8 0 mbufpl 256 163 0 0 11 0 11 11 0 8 0 bufpl 280 2215 0 113 151 0 151 151 0 8 0 anonpl 32 3772 0 0 31 0 31 31 0 246 0 amapchunkpl 152 7527 0 7022 20 0 20 20 0 158 0 amappl16 200 1943 0 1932 5 0 5 5 0 8 4 amappl15 192 22 0 22 1 0 1 1 0 8 1 amappl14 184 98 0 87 1 0 1 1 0 8 0 amappl13 176 3 0 3 1 0 1 1 0 8 1 amappl12 168 955 0 917 2 0 2 2 0 8 0 amappl11 160 50 0 39 1 0 1 1 0 8 0 amappl10 152 12 0 12 1 0 1 1 0 8 1 amappl9 144 267 0 267 1 0 1 1 0 8 1 amappl8 136 25 0 24 1 0 1 1 0 8 0 amappl7 128 90 0 79 1 0 1 1 0 8 0 amappl6 120 168 0 163 1 0 1 1 0 8 0 amappl5 112 106 0 100 1 0 1 1 0 8 0 amappl4 104 270 0 253 1 0 1 1 0 8 0 amappl3 96 1144 0 1027 3 0 3 3 0 8 0 amappl2 88 571 0 513 2 0 2 2 0 8 0 amappl1 80 7577 0 6984 14 0 14 14 0 8 0 amappl 88 2033 0 1859 4 0 4 4 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 24 385 0 346 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 385 0 346 1 0 1 1 0 8 0 vmmpekpl 168 4679 0 4649 2 0 2 2 0 8 0 vmmpepl 168 31114 0 29025 93 0 93 93 0 357 2 vmsppl 480 384 0 346 7 1 6 6 0 8 0 rwobjpl 72 13163 0 10669 47 0 47 47 0 8 0 pdppl 4096 777 0 692 107 10 97 97 0 8 12 pvpl 32 8757 0 0 73 1 72 72 0 265 1 pmappl 256 384 0 346 4 1 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 380 0 13 11 0 11 11 0 8 0 ddb{0}> machine ddbcpu 0 Invalid cpu 0 ddb{0}> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff833dc301) at panic+0x1e5 sys/kern/subr_prf.c:198 mtx_enter_try(ffffffff83987ea0) at mtx_enter_try+0x1bf sys/kern/kern_lock.c:271 mtx_enter(ffffffff83987ea0) at mtx_enter+0x60 sys/kern/kern_lock.c:239 uvm_pageclean(fffffd800877b4d0) at uvm_pageclean+0x290 uvm_pagedequeue sys/uvm/uvm_page.c:-1 [inline] uvm_pageclean(fffffd800877b4d0) at uvm_pageclean+0x290 sys/uvm/uvm_page.c:980 uvm_pagefree(fffffd800877b4d0) at uvm_pagefree+0x26 sys/uvm/uvm_page.c:1020 uvn_get(fffffd806b118ad0,0,ffff800039805e68,ffff800039805e44,0,2,477d43580812e692,ffff8000398060c0) at uvn_get+0x68b sys/uvm/uvm_vnode.c:1118 uvm_fault_lower_io(ffff800039806088,ffff8000398060c0,ffff800039805ef0,ffff800039805ef8) at uvm_fault_lower_io+0x319 sys/uvm/uvm_fault.c:1588 uvm_fault_lower(ffff800039806088,ffff8000398060c0,ffff800039806000) at uvm_fault_lower+0x278 sys/uvm/uvm_fault.c:1362 uvm_fault(fffffd806b579d40,200000000000,0,2) at uvm_fault+0x272 sys/uvm/uvm_fault.c:-1 upageflttrap(ffff800039806210,200000000100) at upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:188 usertrap(ffff800039806210) at usertrap+0x2d8 sys/arch/amd64/amd64/trap.c:436 recall_trap() at recall_trap+0x8 end of kernel end trace frame: 0x788990dc52b0, count: -13 ddb{0}> machine ddbcpu 1 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp x86_ipi_db(ffff8000299edff0) 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 __mp_lock(ffffffff838d5c70) at __mp_lock+0x199 __mp_lock_spin sys/kern/kern_lock.c:113 [inline] __mp_lock(ffffffff838d5c70) at __mp_lock+0x199 sys/kern/kern_lock.c:144 uvm_fault(fffffd806b42bd48,e41bffc1000,0,1) at uvm_fault+0x1ee sys/uvm/uvm_fault.c:689 upageflttrap(ffff80003c44d870,e41bffc1000) at upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:188 usertrap(ffff80003c44d870) at usertrap+0x2d8 sys/arch/amd64/amd64/trap.c:436 recall_trap() at recall_trap+0x8 end of kernel end trace frame: 0x7c336ef58bd0, count: 7 ddb{1}> trace x86_ipi_db(ffff8000299edff0) 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 __mp_lock(ffffffff838d5c70) at __mp_lock+0x199 __mp_lock_spin sys/kern/kern_lock.c:113 [inline] __mp_lock(ffffffff838d5c70) at __mp_lock+0x199 sys/kern/kern_lock.c:144 uvm_fault(fffffd806b42bd48,e41bffc1000,0,1) at uvm_fault+0x1ee sys/uvm/uvm_fault.c:689 upageflttrap(ffff80003c44d870,e41bffc1000) at upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:188 usertrap(ffff80003c44d870) at usertrap+0x2d8 sys/arch/amd64/amd64/trap.c:436 recall_trap() at recall_trap+0x8 end of kernel end trace frame: 0x7c336ef58bd0, count: -8