uvm_fault(0xfffffd800da553f0, 0x0, 0, 1) -> e fatal page fault in supervisor mode trap type 6 code 0 rip ffffffff81047658 cs 8 rflags 10207 cr2 0 cpl 0 rsp ffff80002a354280 gsbase 0xffff8000299ddff0 kgsbase 0x0 panic: trap type 6, code=0, pc=ffffffff81047658 Starting stack trace... panic(ffffffff833e5c81) at panic+0x1d0 sys/kern/subr_prf.c:229 kerntrap(ffff80002a3541d0) at kerntrap+0x30b alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b dt_ioctl_record_stop(ffff800001791000) at dt_ioctl_record_stop+0x108 sys/dev/dt/dt_dev.c:593 dtclose(21e5f,2,2000,ffff8000fffefca0) at dtclose+0x109 dt_pcb_purge sys/dev/dt/dt_dev.c:-1 [inline] dtclose(21e5f,2,2000,ffff8000fffefca0) at dtclose+0x109 sys/dev/dt/dt_dev.c:239 spec_close(ffff80002a354380) at spec_close+0x466 sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffd8073b17050,2,fffffd80097fd680,ffff8000fffefca0) at VOP_CLOSE+0x132 sys/kern/vfs_vops.c:156 vn_closefile(fffffd806c64bb80,ffff8000fffefca0) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd806c64bb80,ffff8000fffefca0) at vn_closefile+0x12b sys/kern/vfs_vnops.c:615 fdrop(fffffd806c64bb80,ffff8000fffefca0) at fdrop+0x121 sys/kern/kern_descrip.c:1280 closef(fffffd806c64bb80,ffff8000fffefca0) at closef+0x192 sys/kern/kern_descrip.c:1264 fdfree(ffff8000fffefca0) at fdfree+0x116 sys/kern/kern_descrip.c:1195 exit1(ffff8000fffefca0,0,0,1) at exit1+0x576 sys/kern/kern_exit.c:215 sys_exit(ffff8000fffefca0,ffff80002a3546f0,ffff80002a354640) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff80002a3546f0) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80002a3546f0) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:775 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7d058603bd10, count: 242 End of stack trace. WARNING: SPL NOT LOWERED ON SYSCALL 11 -1 EXIT 0 4 Stopped at savectx+0xae: movl $0,%gs:0x688 TID PID UID PRFLAGS PFLAGS CPU COMMAND 75429 17642 0 0x1000 0x4080000 0 syz-executor *418143 78377 0 0x2 0 1 syz-executor savectx() at savectx+0xae end of kernel end trace frame: 0x71aaf7cf9d10, 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{1}> set $lines = 0 ddb{1}> set $maxwidth = 0 ddb{1}> show panic *cpu1: uvm_fault(0xfffffd800da553f0, 0x0, 0, 1) -> e ddb{1}> trace savectx() at savectx+0xae end of kernel end trace frame: 0x71aaf7cf9d10, count: -1 ddb{1}> show registers rdi 0 rsi 0 rbp 0xffff80003c426f00 rbx 0 rdx 0 rcx 0xffff8000fffe6fb0 rax 0x33 r8 0xffff80003c426e30 r9 0x1 r10 0x8c6641be5e814572 r11 0x4ef402aad2af7254 r12 0 r13 0 r14 0xffff8000fffe6fb0 r15 0 rip 0xffffffff81b193ee savectx+0xae cs 0x8 rflags 0x46 rsp 0xffff80003c426e80 ss 0x10 savectx+0xae: movl $0,%gs:0x688 ddb{1}> show proc PROC (syz-executor) tid=418143 pid=78377 tcnt=1 stat=onproc flags process=2 proc=0 runpri=84, usrpri=84, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff8000fffef4d8,0xffff8000377dd4f8 process=0xffff800038feb9e0 user=0xffff80003c421000, vmspace=0xfffffd80607143f8 estcpu=34, cpticks=322, pctcpu=0.23, user=2, sys=317, intr=3 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 16548 176244 78377 0 2 0 syz-executor 16548 480097 78377 0 3 0x4000080 lockf syz-executor 30267 478469 52627 0 3 0x80 nanoslp syz-executor 30267 415696 52627 0 3 0x4000080 ttyretype syz-executor 30267 285582 52627 0 3 0x4000080 fsleep syz-executor 17642 49298 62777 0 3 0x3000 suspend syz-executor 17642 75429 62777 0 7 0x4081000 syz-executor 78617 427845 0 0 3 0x14280 nfsidl nfsio 49157 311905 0 0 3 0x14280 nfsidl nfsio 59798 4823 0 0 3 0x14280 nfsidl nfsio 4929 190201 0 0 3 0x14280 nfsidl nfsio 98088 135435 0 0 3 0x14200 acct acct 92993 286455 51385 0 3 0x82 piperd syz-executor 52627 247035 51385 0 3 0x82 nanoslp syz-executor 91098 22354 51385 0 3 0x82 nanoslp syz-executor 95984 195551 1 0 3 0x100083 ttyopn getty 62777 176682 51385 0 3 0x82 nanoslp syz-executor *78377 418143 51385 0 7 0x2 syz-executor 63291 25411 51385 0 3 0x10000082 nanoslp syz-executor 77950 326141 51385 0 3 0x82 piperd syz-executor 51385 75803 3347 0 3 0x82 wait syz-executor 3347 109245 62647 0 3 0x10008a sigsusp ksh 62647 272991 2410 0 3 0x98 kqread sshd-session 2410 495638 81156 0 3 0x92 kqread sshd-session 81156 515667 1 0 3 0x88 kqread sshd 79010 371217 84313 74 3 0x1100092 bpf pflogd 84313 96162 1 0 3 0x80 sbwait pflogd 39603 129396 57311 73 3 0x1100090 kqread syslogd 57311 353811 1 0 3 0x100082 sbwait syslogd 24797 105854 1 0 3 0x100080 kqread resolvd 12924 57383 79387 77 3 0x100092 kqread dhcpleased 80295 215029 79387 77 3 0x100092 kqread dhcpleased 79387 396921 1 0 3 0x80 kqread dhcpleased 76117 99336 0 0 3 0x14200 bored smr 45629 441777 0 0 2 0x14200 zerothread 52832 238016 0 0 3 0x14200 aiodoned aiodoned 81025 359674 0 0 3 0x14200 syncer update 18285 273884 0 0 3 0x14200 cleaner cleaner 60673 387091 0 0 3 0x14200 reaper reaper 62653 428201 0 0 3 0x14200 pgdaemon pagedaemon 51219 142011 0 0 3 0x14200 bored viomb 10194 91330 0 0 3 0x40014200 acpi0 acpi0 88426 121776 0 0 3 0x40014200 idle1 31659 385257 0 0 3 0x14200 bored softnet1 41741 460877 0 0 3 0x14200 netlock softnet0 7039 60453 0 0 2 0x40014200 systqmp 27558 275830 0 0 3 0x14200 bored systq 44864 522356 0 0 3 0x14200 tmoslp softclockmp 49227 476402 0 0 3 0x40014200 tmoslp softclock 87663 462810 0 0 3 0x40014200 idle0 1 461396 0 0 3 0x82 wait init 0 0 -1 0 3 0x10010200 scheduler swapper ddb{1}> show all locks ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 11118 12199K 13058K 166960K 20359 0 pcb 17 16K 32K 166960K 1086 0 rtable 270 21K 22K 166960K 1728 0 pf 37 18K 82K 166960K 447 0 ifaddr 42 9K 10K 166960K 309 0 ifgroup 57 2K 3K 166960K 494 0 sysctl 4 1K 9K 166960K 115 0 counters 74 37K 38K 166960K 468 0 ioctlops 0 0K 4K 166960K 2734 0 iov 1 0K 24K 166960K 395 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1483 93K 93K 166960K 6562 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 10K 14K 166960K 68 0 VM map 2 1K 1K 166960K 2 0 sem 34 137K 137K 166960K 176 0 dirhash 12 2K 2K 166960K 120 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 14 49K 240K 166960K 5305 0 sigio 0 0K 0K 166960K 204 0 proc 73 115K 164K 166960K 1730 0 subproc 72 4K 4K 166960K 302 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 840 0 in_multi 84 6K 7K 166960K 591 0 ether_multi 1 0K 0K 166960K 62 0 mrt 3 0K 0K 166960K 55 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 265 1182K 1182K 166960K 265 0 exec 0 0K 1K 166960K 1426 0 fusefs mount 1 32K 32K 166960K 1 0 pfkey data 0 0K 0K 166960K 8 0 tdb 3 0K 0K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 233 153K 168K 166960K 47912 0 UVM aobj 34 30K 30K 166960K 42 0 pinsyscall 39 78K 111K 166960K 7022 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 1K 166960K 387 0 NDP 13 0K 2K 166960K 224 0 temp 92 8688K 8936K 166960K 238955 0 kqueue 14 22K 34K 166960K 1040 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 120 789 0 786 10 9 1 3 0 8 0 rtentry 176 509 0 411 6 0 6 6 0 8 0 unpcb 144 3657 0 3640 31 27 4 6 0 8 3 syncache 336 5 0 5 3 3 0 1 0 8 0 tcpcb 736 1531 0 1526 32 31 1 7 0 8 0 arp 136 77 0 58 1 0 1 1 0 8 0 inpcb 328 6062 0 6052 64 62 2 13 0 8 0 ip6q 72 1 0 1 1 1 0 1 0 8 0 ip6af 40 10 0 10 1 1 0 1 0 8 0 nd6 152 112 0 91 2 1 1 2 0 8 0 pkpcb 40 33 0 33 13 12 1 1 0 8 1 kcovpl 48 33 0 25 1 0 1 1 0 8 0 mppekey 1024 3 0 3 3 3 0 1 0 8 0 ppxss 1192 135 0 133 2 1 1 1 0 8 0 pppxif 1504 16 0 16 8 8 0 1 0 8 0 pffrag 232 103 0 95 1 0 1 1 0 482 0 pffrnode 88 98 0 91 1 0 1 1 0 8 0 pffrent 40 200 0 192 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 24 332 0 258 1 0 1 1 0 8 0 pfstkey 128 332 0 258 4 0 4 4 0 8 0 pfstate 448 332 0 258 12 0 12 12 0 8 0 pfrule 1344 21 0 16 2 1 1 2 0 8 0 rttmr 136 14 0 14 6 6 0 1 0 8 0 art_heap8 4096 6 0 0 6 0 6 6 0 8 0 art_heap4 256 2468 0 2053 51 22 29 32 0 8 3 art_table 40 2474 0 2053 6 1 5 6 0 8 0 art_node 32 507 0 420 1 0 1 1 0 8 0 sysvmsgpl 40 22 0 13 1 0 1 1 0 8 0 semupl 112 5 0 5 3 3 0 1 0 8 0 semapl 112 163 0 131 1 0 1 1 0 8 0 shmpl 112 19 0 2 1 0 1 1 0 8 0 dirhash 1024 94 0 77 3 0 3 3 0 8 0 dino2pl 256 11240 0 9676 98 0 98 98 0 8 0 ffsino 296 11240 0 9676 121 0 121 121 0 8 0 nchpl 144 18096 0 16326 66 0 66 66 0 8 0 rtmask 32 32 0 31 2 1 1 1 0 8 0 vnodes 216 5926 0 0 330 0 330 330 0 8 0 namei 1024 66872 0 66872 10 9 1 2 0 8 1 percpumem 16 249 0 197 1 0 1 1 0 8 0 vcpupl 3968 15 0 1 2 0 2 2 0 8 0 vmpool 848 20 0 6 2 0 2 2 0 8 0 kstatmem 264 300 0 270 3 0 3 3 0 8 0 scsiplug 72 25 0 25 12 11 1 1 0 8 1 scxspl 216 126970 0 126970 18 17 1 8 1 8 1 plimitpl 152 1783 0 1765 1 0 1 1 0 8 0 sigapl 424 5509 0 5459 8 1 7 7 0 8 0 knotepl 120 792 0 0 24 0 24 24 0 8 0 kqueuepl 224 2070 0 2060 28 27 1 5 0 8 0 pipepl 344 768 0 741 13 10 3 9 0 8 0 fdescpl 528 5478 0 5450 3 0 3 3 0 8 0 filepl 160 38423 0 38201 47 34 13 19 0 8 0 lockfpl 104 2137 0 2131 2 1 1 2 0 8 0 lockfspl 48 813 0 809 1 0 1 1 0 8 0 sessionpl 144 50 0 41 1 0 1 1 0 8 0 pgrppl 48 183 0 166 1 0 1 1 0 8 0 ucredpl 104 6600 0 6587 1 0 1 1 0 8 0 zombiepl 144 6211 0 6207 2 1 1 1 0 8 0 processpl 1232 5509 0 5459 6 1 5 5 0 8 0 procpl 664 13804 0 13750 6 0 6 6 0 8 0 sosppl 176 27 0 27 13 12 1 1 0 8 1 sockpl 752 10859 0 10829 116 105 11 21 0 8 7 mcl64k 65536 18 0 0 3 0 3 3 0 8 0 mcl16k 16384 5 0 0 1 0 1 1 0 8 0 mcl12k 12288 3 0 0 1 0 1 1 0 8 0 mcl9k 9216 3 0 0 1 0 1 1 0 8 0 mcl8k 8192 6 0 0 1 0 1 1 0 8 0 mcl4k 4096 122 0 0 16 0 16 16 0 8 0 mcl2k2 2112 2 0 0 1 0 1 1 0 8 0 mcl2k 2048 142 0 0 8 0 8 8 0 8 0 mtagpl 96 195 0 0 4 0 4 4 0 8 0 mbufpl 256 2212 798 895 80 1 79 80 0 8 0 bufpl 280 52694 0 46558 439 0 439 439 0 8 0 anonpl 32 13916 0 0 112 0 112 112 0 246 0 amapchunkpl 152 168718 0 168145 85 58 27 37 0 158 0 amappl16 200 18118 0 17972 111 98 13 29 0 8 0 amappl15 192 4 0 3 1 0 1 1 0 8 0 amappl14 184 6 0 5 3 2 1 1 0 8 0 amappl13 176 723 0 722 1 0 1 1 0 8 0 amappl12 168 5997 0 5958 3 0 3 3 0 8 0 amappl11 160 6 0 6 2 2 0 1 0 8 0 amappl10 152 49 0 34 1 0 1 1 0 8 0 amappl9 144 256 0 255 2 1 1 1 0 8 0 amappl8 136 30 0 27 1 0 1 1 0 8 0 amappl7 128 218 0 216 1 0 1 1 0 8 0 amappl6 120 607 0 593 1 0 1 1 0 8 0 amappl5 112 76 0 65 1 0 1 1 0 8 0 amappl4 104 569 0 537 1 0 1 1 0 8 0 amappl3 96 34786 0 34692 5 1 4 4 0 8 0 amappl2 88 769 0 704 2 0 2 2 0 8 0 amappl1 80 31679 0 31089 17 3 14 15 0 8 0 amappl 88 45948 0 45793 5 0 5 5 0 92 0 uvmvnodes 80 252 0 0 6 0 6 6 0 8 0 dma65536 65536 2 0 2 2 2 0 1 0 8 0 dma8192 8192 2 0 2 2 1 1 1 0 8 1 dma4096 4096 2 0 2 2 2 0 1 0 8 0 dma2048 2048 1 0 1 1 1 0 1 0 8 0 dma1024 1024 2 0 1 1 0 1 1 0 8 0 dma512 512 2 0 2 2 2 0 1 0 8 0 dma256 256 9 0 9 4 4 0 1 0 8 0 dma128 128 261 0 261 8 7 1 1 0 8 1 dma64 64 9 0 9 4 4 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 41 0 8 1 0 1 1 0 8 0 uaddrrnd 24 5478 0 5450 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 5478 0 5450 1 0 1 1 0 8 0 vmmpekpl 168 36452 0 36378 4 0 4 4 0 8 0 vmmpepl 168 342226 0 340309 166 67 99 111 0 357 1 vmsppl 488 5477 0 5450 6 1 5 5 0 8 0 rwobjpl 80 85330 0 83989 44 8 36 37 0 8 0 pdppl 4096 11003 0 10926 192 105 87 87 0 8 10 pvpl 32 22114 0 0 178 1 177 177 0 265 0 pmappl 256 5497 0 5456 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 536 0 186 12 1 11 11 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp x86_ipi_db(ffffffff83824ff0) 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(ffffffff838e6d00) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:142 [inline] __mp_lock(ffffffff838e6d00) at __mp_lock+0x192 sys/kern/kern_lock.c:173 softintr_dispatch(2) at softintr_dispatch+0x125 sys/kern/kern_softintr.c:83 dosoftint(2) at dosoftint+0x54 sys/arch/amd64/amd64/intr.c:862 Xsofttty() at Xsofttty+0x27 __mp_lock(ffffffff838e6d00) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:142 [inline] __mp_lock(ffffffff838e6d00) at __mp_lock+0x192 sys/kern/kern_lock.c:173 softintr_dispatch(0) at softintr_dispatch+0x125 sys/kern/kern_softintr.c:83 dosoftint(0) at dosoftint+0x54 sys/arch/amd64/amd64/intr.c:862 Xsoftclock() at Xsoftclock+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 __mp_lock(ffffffff838e6d00) at __mp_lock+0x1a3 __mp_lock_spin sys/kern/kern_lock.c:142 [inline] __mp_lock(ffffffff838e6d00) at __mp_lock+0x1a3 sys/kern/kern_lock.c:173 __mp_acquire_count(ffffffff838e6d00,1) at __mp_acquire_count+0x58 sys/kern/kern_lock.c:-1 end trace frame: 0xffff80002a36c480, count: 0 ddb{0}> trace x86_ipi_db(ffffffff83824ff0) 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(ffffffff838e6d00) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:142 [inline] __mp_lock(ffffffff838e6d00) at __mp_lock+0x192 sys/kern/kern_lock.c:173 softintr_dispatch(2) at softintr_dispatch+0x125 sys/kern/kern_softintr.c:83 dosoftint(2) at dosoftint+0x54 sys/arch/amd64/amd64/intr.c:862 Xsofttty() at Xsofttty+0x27 __mp_lock(ffffffff838e6d00) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:142 [inline] __mp_lock(ffffffff838e6d00) at __mp_lock+0x192 sys/kern/kern_lock.c:173 softintr_dispatch(0) at softintr_dispatch+0x125 sys/kern/kern_softintr.c:83 dosoftint(0) at dosoftint+0x54 sys/arch/amd64/amd64/intr.c:862 Xsoftclock() at Xsoftclock+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 __mp_lock(ffffffff838e6d00) at __mp_lock+0x1a3 __mp_lock_spin sys/kern/kern_lock.c:142 [inline] __mp_lock(ffffffff838e6d00) at __mp_lock+0x1a3 sys/kern/kern_lock.c:173 __mp_acquire_count(ffffffff838e6d00,1) at __mp_acquire_count+0x58 sys/kern/kern_lock.c:-1 randomwrite(412dff,ffff80002a36c760,1) at randomwrite+0x38b sys/dev/rnd.c:747 spec_write(ffff80002a36c530) at spec_write+0x11f sys/kern/spec_vnops.c:302 VOP_WRITE(fffffd806c72a9a0,ffff80002a36c760,1,fffffd80097fd680) at VOP_WRITE+0x101 sys/kern/vfs_vops.c:245 vn_write(fffffd806c97fd50,ffff80002a36c760,0) at vn_write+0x1d3 sys/kern/vfs_vnops.c:408 dofilewritev(ffff8000fffeefa8,5,ffff80002a36c760,0,ffff80002a36c820) at dofilewritev+0x242 sys/kern/sys_generic.c:380 sys_writev(ffff8000fffeefa8,ffff80002a36c8d0,ffff80002a36c820) at sys_writev+0xd8 sys/kern/sys_generic.c:327 syscall(ffff80002a36c8d0) at syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80002a36c8d0) at syscall+0xbd4 sys/arch/amd64/amd64/trap.c:775 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x104466177c0, count: -22 ddb{0}> machine ddbcpu 1 Stopped at savectx+0xae: movl $0,%gs:0x688 savectx() at savectx+0xae end of kernel end trace frame: 0x71aaf7cf9d10, count: 14 ddb{1}> trace savectx() at savectx+0xae end of kernel end trace frame: 0x71aaf7cf9d10, count: -1