uvm_fault(0xfffffd806b4e35d8, 0x0, 0, 1) -> e fatal page fault in supervisor mode trap type 6 code 0 rip ffffffff825ce928 cs 8 rflags 10207 cr2 0 cpl 0 rsp ffff80002f801aa0 gsbase 0xffff8000299edff0 kgsbase 0x0 panic: trap type 6, code=0, pc=ffffffff825ce928 Starting stack trace... panic(ffffffff833a5025) at panic+0x1d0 sys/kern/subr_prf.c:229 kerntrap(ffff80002f8019f0) at kerntrap+0x30b alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b dt_ioctl_record_stop(ffff800001474000) at dt_ioctl_record_stop+0x108 sys/dev/dt/dt_dev.c:586 dtclose(11e5f,81,2000,ffff80003380a558) at dtclose+0x109 dt_pcb_purge sys/dev/dt/dt_dev.c:-1 [inline] dtclose(11e5f,81,2000,ffff80003380a558) at dtclose+0x109 sys/dev/dt/dt_dev.c:232 spec_close(ffff80002f801ba0) at spec_close+0x466 sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffd806b8e6388,81,fffffd80097fb4e0,ffff80003380a558) at VOP_CLOSE+0x132 sys/kern/vfs_vops.c:156 vn_closefile(fffffd806b811b80,ffff80003380a558) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd806b811b80,ffff80003380a558) at vn_closefile+0x12b sys/kern/vfs_vnops.c:615 fdrop(fffffd806b811b80,ffff80003380a558) at fdrop+0x121 sys/kern/kern_descrip.c:1280 closef(fffffd806b811b80,ffff80003380a558) at closef+0x192 sys/kern/kern_descrip.c:1264 fdfree(ffff80003380a558) at fdfree+0x116 sys/kern/kern_descrip.c:1195 exit1(ffff80003380a558,0,0,1) at exit1+0x576 sys/kern/kern_exit.c:215 sys_exit(ffff80003380a558,ffff80002f801f10,ffff80002f801e60) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff80002f801f10) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80002f801f10) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:748 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7f61bd96a9f0, count: 242 End of stack trace. WARNING: SPL NOT LOWERED ON SYSCALL 54 -1 EXIT 0 a Stopped at savectx+0xae: movl $0,%gs:0x688 TID PID UID PRFLAGS PFLAGS CPU COMMAND *455035 32066 0 0 0x4000000 0 syz-executor 224728 12146 0 0x14000 0x200 1 reaper savectx() at savectx+0xae end of kernel end trace frame: 0x959e07fc700, count: 14 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 *cpu1: uvm_fault(0xfffffd806b4e35d8, 0x0, 0, 1) -> e ddb{0}> trace savectx() at savectx+0xae end of kernel end trace frame: 0x959e07fc700, count: -1 ddb{0}> show registers rdi 0 rsi 0 rbp 0xffff80003c463760 rbx 0 rdx 0xffff800001453a80 rcx 0xffff800033809ca8 rax 0x33 r8 0xffff80003c463690 r9 0 r10 0x8e2a2af7f84ff29b r11 0xb19da1603683e385 r12 0 r13 0 r14 0xffff800033809ca8 r15 0 rip 0xffffffff832783ee savectx+0xae cs 0x8 rflags 0x46 rsp 0xffff80003c4636e0 ss 0x10 savectx+0xae: movl $0,%gs:0x688 ddb{0}> show proc PROC (syz-executor) tid=455035 pid=32066 tcnt=2 stat=onproc flags process=0 proc=4000000 runpri=50, usrpri=50, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff80003380b780,0xffff800033809a20 process=0xffff80003b0261d0 user=0xffff80003c45e000, vmspace=0xfffffd806b4e3b90 estcpu=36, cpticks=1, pctcpu=0.0, user=0, sys=1, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 36748 374459 85575 0 2 0 syz-executor 36748 340880 85575 0 3 0x4000080 fsleep syz-executor 67391 425469 54781 0 2 0 syz-executor 67391 452692 54781 0 3 0x4000080 ttyout syz-executor 67391 161018 54781 0 3 0x4000080 ttyout syz-executor 32066 522371 50484 0 2 0 syz-executor *32066 455035 50484 0 7 0x4000000 syz-executor 56371 427738 29178 -1 3 0x90 nanoslp syz-executor 56371 151790 29178 -1 3 0x4000090 kqread syz-executor 56371 367543 29178 -1 3 0x4000090 fsleep syz-executor 93566 12201 38240 0 3 0x80 nanoslp syz-executor 93566 14331 38240 0 3 0x4000080 sbwait syz-executor 93566 475355 38240 0 3 0x4000080 fsleep syz-executor 65369 140847 15667 -1 3 0x90 nanoslp syz-executor 65369 35959 15667 -1 3 0x4000090 pipewr syz-executor 65369 294561 15667 -1 3 0x4000090 pipewr syz-executor 65369 11653 15667 -1 3 0x4000090 fsleep syz-executor 38240 153485 35234 0 3 0x82 nanoslp syz-executor 29178 498805 35234 0 3 0x82 nanoslp syz-executor 54781 143655 35234 0 3 0x82 nanoslp syz-executor 73758 498396 35234 0 3 0x82 nanoslp syz-executor 45258 455070 35234 0 3 0x82 nanoslp syz-executor 85575 308422 35234 0 3 0x82 nanoslp syz-executor 50484 349236 35234 0 3 0x82 nanoslp syz-executor 15667 156536 35234 0 3 0x82 nanoslp syz-executor 35234 278110 86295 0 3 0x82 kqread syz-executor 86295 401493 22166 0 3 0x10008a sigsusp ksh 22166 257251 32811 0 3 0x98 kqread sshd-session 32811 105552 86750 0 3 0x92 kqread sshd-session 27558 317001 1 0 3 0x100083 ttyin getty 86750 361221 1 0 3 0x88 kqread sshd 74719 36692 52688 74 3 0x1100092 bpf pflogd 52688 260139 1 0 3 0x80 sbwait pflogd 55986 60027 6028 73 3 0x1100090 kqread syslogd 6028 406569 1 0 3 0x100082 sbwait syslogd 24248 501670 1 0 3 0x100080 kqread resolvd 44640 276941 66802 77 3 0x100092 kqread dhcpleased 56668 32589 66802 77 3 0x100092 kqread dhcpleased 66802 227235 1 0 3 0x80 kqread dhcpleased 80395 301466 0 0 3 0x14200 bored smr 21261 356241 0 0 2 0x14200 zerothread 65500 495073 0 0 3 0x14200 aiodoned aiodoned 48072 245881 0 0 3 0x14200 syncer update 88320 386278 0 0 3 0x14200 cleaner cleaner 12146 224728 0 0 7 0x14200 reaper 28440 282162 0 0 3 0x14200 pgdaemon pagedaemon 90092 82735 0 0 3 0x14200 bored viomb 31353 65617 0 0 3 0x40014200 acpi0 acpi0 26293 331213 0 0 3 0x40014200 idle1 59354 174895 0 0 3 0x14200 bored softnet7 89753 281660 0 0 3 0x14200 bored softnet6 87352 276720 0 0 3 0x14200 bored softnet5 64289 272302 0 0 3 0x14200 bored softnet4 47418 112835 0 0 3 0x14200 bored softnet3 79745 411106 0 0 3 0x14200 bored softnet2 2096 373658 0 0 3 0x14200 bored softnet1 92070 134327 0 0 3 0x14200 bored softnet0 12430 207232 0 0 2 0x40014200 systqmp 47104 151469 0 0 3 0x14200 bored systq 83812 287898 0 0 3 0x14200 tmoslp softclockmp 184 306403 0 0 3 0x40014200 tmoslp softclock 54064 487503 0 0 3 0x40014200 idle0 1 136792 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks CPU 0: exclusive mutex &pmap->pm_mtx r = 0 (0xfffffd806a1a9b10) #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_try+0x1ad sys/kern/kern_lock.c:311 #2 mtx_enter+0x62 sys/kern/kern_lock.c:261 #3 pmap_do_remove+0xa9 rcr3 sys/arch/amd64/compile/SYZKALLER/obj/machine/cpufunc.h:139 [inline] #3 pmap_do_remove+0xa9 pmap_map_ptes sys/arch/amd64/amd64/pmap.c:437 [inline] #3 pmap_do_remove+0xa9 sys/arch/amd64/amd64/pmap.c:1824 #4 uvm_unmap_kill_entry_withlock+0x269 sys/uvm/uvm_map.c:1863 #5 uvm_map_teardown+0x117 uvm_map_addr_RBT_LEFT sys/uvm/uvm_map.h:-1 [inline] #5 uvm_map_teardown+0x117 sys/uvm/uvm_map.c:2486 #6 exit1+0x6fc sys/kern/kern_exit.c:260 #7 sys_exit+0x1a sys/kern/kern_exit.c:-1 #8 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] #8 syscall+0xb17 sys/arch/amd64/amd64/trap.c:748 #9 Xsyscall+0x128 ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10209 11066K 11087K 166960K 11304 0 pcb 18 12K 12K 166960K 40 0 rtable 205 5K 6K 166960K 261 0 pf 35 17K 18K 166960K 46 0 ifaddr 43 7K 7K 166960K 45 0 ifgroup 55 2K 2K 166960K 55 0 sysctl 1 1K 9K 166960K 5 0 counters 68 36K 36K 166960K 68 0 ioctlops 0 0K 4K 166960K 1490 0 iov 1 2K 12K 166960K 4 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1343 84K 85K 166960K 1385 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 5 0K 0K 166960K 5 0 dirhash 12 2K 2K 166960K 15 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 17 61K 93K 166960K 179 0 proc 72 115K 164K 166960K 545 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 3 0 in_multi 99 7K 7K 166960K 100 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 61 281K 281K 166960K 61 0 exec 0 0K 1K 166960K 370 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 239 159K 175K 166960K 3294 0 UVM aobj 5 2K 2K 166960K 6 0 pinsyscall 42 84K 102K 166960K 1277 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 4 0 NDP 28 2K 2K 166960K 28 0 temp 37 8640K 8704K 166960K 6529 0 kqueue 14 20K 22K 166960K 29 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 39 0 36 1 0 1 1 0 8 0 rtentry 176 95 0 1 5 0 5 5 0 8 0 unpcb 144 130 0 108 4 0 4 4 0 8 3 syncache 336 3 0 3 1 0 1 1 0 8 1 tcpcb 736 16 0 12 1 0 1 1 0 8 0 arp 128 10 0 0 1 0 1 1 0 8 0 inpcb 328 103 0 93 2 0 2 2 0 8 0 nd6 144 16 0 0 1 0 1 1 0 8 0 kcovpl 48 8 0 0 1 0 1 1 0 8 0 pfstscr 40 1 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 18 0 0 1 0 1 1 0 8 0 pfstkey 128 18 0 0 1 0 1 1 0 8 0 pfstate 384 17 0 0 2 0 2 2 0 8 0 pfrule 1344 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 256 436 0 0 28 0 28 28 0 8 0 art_table 40 437 0 0 5 0 5 5 0 8 0 art_node 32 95 0 11 1 0 1 1 0 8 0 semapl 112 3 0 0 1 0 1 1 0 8 0 shmpl 112 3 0 1 1 0 1 1 0 8 0 dirhash 1024 19 0 2 3 0 3 3 0 8 0 dino2pl 256 1636 0 120 95 0 95 95 0 8 0 ffsino 296 1636 0 120 117 0 117 117 0 8 0 nchpl 144 1882 0 191 63 0 63 63 0 8 0 uvmvnodes 80 1738 0 0 36 0 36 36 0 8 0 vnodes 216 1738 0 0 97 0 97 97 0 8 0 namei 1024 5813 0 5813 2 0 2 2 0 8 2 percpumem 16 49 0 0 1 0 1 1 0 8 0 kstatmem 264 26 0 0 2 0 2 2 0 8 0 scxspl 216 6671 0 6671 3 1 2 2 1 8 2 plimitpl 152 39 0 22 1 0 1 1 0 8 0 sigapl 424 487 0 433 7 0 7 7 0 8 0 knotepl 120 288 0 0 9 0 9 9 0 8 0 kqueuepl 224 28 0 18 1 0 1 1 0 8 0 pipepl 344 111 0 82 3 0 3 3 0 8 0 fdescpl 528 465 0 434 3 0 3 3 0 8 0 filepl 160 1751 0 1517 13 0 13 13 0 8 2 lockfpl 104 21 0 18 1 0 1 1 0 8 0 lockfspl 48 12 0 9 1 0 1 1 0 8 0 sessionpl 144 22 0 13 1 0 1 1 0 8 0 pgrppl 48 30 0 13 1 0 1 1 0 8 0 ucredpl 104 138 0 121 1 0 1 1 0 8 0 zombiepl 144 435 0 433 1 0 1 1 0 8 0 processpl 1232 487 0 433 5 0 5 5 0 8 0 procpl 664 569 0 504 6 0 6 6 0 8 0 sockpl 752 373 0 337 11 0 11 11 0 8 7 mcl64k 65536 2 0 0 1 0 1 1 0 8 0 mcl16k 16384 2 0 0 1 0 1 1 0 8 0 mcl12k 12288 1 0 0 1 0 1 1 0 8 0 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 20 0 0 3 0 3 3 0 8 0 mtagpl 96 3 0 0 1 0 1 1 0 8 0 mbufpl 256 114 0 0 8 0 8 8 0 8 0 bufpl 280 2988 0 125 205 0 205 205 0 8 0 anonpl 32 5448 0 0 44 0 44 44 0 246 0 amapchunkpl 152 9870 0 9375 35 2 33 33 0 158 13 amappl16 200 2023 0 2001 5 0 5 5 0 8 3 amappl15 192 22 0 22 1 0 1 1 0 8 1 amappl14 184 224 0 212 1 0 1 1 0 8 0 amappl13 176 45 0 45 1 0 1 1 0 8 1 amappl12 168 1145 0 1114 3 1 2 2 0 8 0 amappl11 160 50 0 36 1 0 1 1 0 8 0 amappl10 152 4 0 4 1 1 0 1 0 8 0 amappl9 144 252 0 252 1 0 1 1 0 8 1 amappl8 136 20 0 18 1 0 1 1 0 8 0 amappl7 128 130 0 118 1 0 1 1 0 8 0 amappl6 120 179 0 176 1 0 1 1 0 8 0 amappl5 112 131 0 122 1 0 1 1 0 8 0 amappl4 104 302 0 284 1 0 1 1 0 8 0 amappl3 96 1593 0 1482 5 1 4 4 0 8 1 amappl2 88 639 0 578 2 0 2 2 0 8 0 amappl1 80 8380 0 7774 14 0 14 14 0 8 0 amappl 88 2598 0 2431 5 0 5 5 0 92 1 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 19 0 18 1 0 1 1 0 8 0 aobjpl 72 5 0 1 1 0 1 1 0 8 0 uaddrrnd 24 465 0 434 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 465 0 434 1 0 1 1 0 8 0 vmmpekpl 168 5372 0 5333 2 0 2 2 0 8 0 vmmpepl 168 36667 0 34702 89 0 89 89 0 357 1 vmsppl 488 464 0 433 5 0 5 5 0 8 1 rwobjpl 80 14731 0 12067 55 0 55 55 0 8 0 pdppl 4096 938 0 866 102 16 86 86 0 8 14 pvpl 32 12851 0 0 104 0 104 104 0 265 0 pmappl 256 464 0 433 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 267 0 18 8 0 8 8 0 8 0 ddb{0}> machine ddbcpu 0 Invalid cpu 0 ddb{0}> trace savectx() at savectx+0xae end of kernel end trace frame: 0x959e07fc700, count: -1 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 pmap_remove_ptes(ffffffff838a93e0,0,7fc0001e24f0,ffff80003c49e000,ffff80003c4a4000,0,a7cbd8915cdd5ea5) at pmap_remove_ptes+0xe9 sys/arch/amd64/amd64/pmap.c:1670 pmap_do_remove(ffffffff838a93e0,ffff80003c49e000,ffff80003c4a4000,0) at pmap_do_remove+0x589 sys/arch/amd64/amd64/pmap.c:1920 uvm_unmap_kill_entry_withlock(ffffffff8394f198,fffffd806bc60158,1) at uvm_unmap_kill_entry_withlock+0x269 sys/uvm/uvm_map.c:1863 uvm_unmap_remove(ffffffff8394f198,ffff80003c49e000,ffff80003c4a4000,ffff80002a2688b8,0,1,c7eaea8dc52d05b) at uvm_unmap_remove+0x6b2 sys/uvm/uvm_map.c:2002 uvm_unmap(ffffffff8394f198,ffff80003c49e000,ffff80003c4a4000) at uvm_unmap+0xa7 vm_map_unlock_ln sys/uvm/uvm_map.c:-1 [inline] uvm_unmap(ffffffff8394f198,ffff80003c49e000,ffff80003c4a4000) at uvm_unmap+0xa7 sys/uvm/uvm_map.c:1793 km_free(ffff80003c49e000,6000,ffffffff83440de0,ffffffff83624a18) at km_free+0x87 sys/uvm/uvm_km.c:831 uvm_uarea_free(ffff80003380b4e8) at uvm_uarea_free+0x4f sys/uvm/uvm_glue.c:304 reaper(ffff8000ffffc7d0) at reaper+0x1aa sys/kern/kern_exit.c:493 end trace frame: 0x0, count: 4 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 pmap_remove_ptes(ffffffff838a93e0,0,7fc0001e24f0,ffff80003c49e000,ffff80003c4a4000,0,a7cbd8915cdd5ea5) at pmap_remove_ptes+0xe9 sys/arch/amd64/amd64/pmap.c:1670 pmap_do_remove(ffffffff838a93e0,ffff80003c49e000,ffff80003c4a4000,0) at pmap_do_remove+0x589 sys/arch/amd64/amd64/pmap.c:1920 uvm_unmap_kill_entry_withlock(ffffffff8394f198,fffffd806bc60158,1) at uvm_unmap_kill_entry_withlock+0x269 sys/uvm/uvm_map.c:1863 uvm_unmap_remove(ffffffff8394f198,ffff80003c49e000,ffff80003c4a4000,ffff80002a2688b8,0,1,c7eaea8dc52d05b) at uvm_unmap_remove+0x6b2 sys/uvm/uvm_map.c:2002 uvm_unmap(ffffffff8394f198,ffff80003c49e000,ffff80003c4a4000) at uvm_unmap+0xa7 vm_map_unlock_ln sys/uvm/uvm_map.c:-1 [inline] uvm_unmap(ffffffff8394f198,ffff80003c49e000,ffff80003c4a4000) at uvm_unmap+0xa7 sys/uvm/uvm_map.c:1793 km_free(ffff80003c49e000,6000,ffffffff83440de0,ffffffff83624a18) at km_free+0x87 sys/uvm/uvm_km.c:831 uvm_uarea_free(ffff80003380b4e8) at uvm_uarea_free+0x4f sys/uvm/uvm_glue.c:304 reaper(ffff8000ffffc7d0) at reaper+0x1aa sys/kern/kern_exit.c:493 end trace frame: 0x0, count: -11