uvm_fault(0xfffffd80604a0028, 0x0, 0, 1) -> e fatal page fault in supervisor mode trap type 6 code 0 rip ffffffff81c007b8 cs 8 rflags 10207 cr2 0 cpl 0 rsp ffff80002a327a00 gsbase 0xffff8000299edff0 kgsbase 0x0 panic: trap type 6, code=0, pc=ffffffff81c007b8 Starting stack trace... panic(ffffffff833a5db0) at panic+0x1d0 sys/kern/subr_prf.c:229 kerntrap(ffff80002a327950) at kerntrap+0x30b alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b dt_ioctl_record_stop(ffff800001568000) at dt_ioctl_record_stop+0x108 sys/dev/dt/dt_dev.c:586 dtclose(11e5f,81,2000,ffff80003c441258) at dtclose+0x109 dt_pcb_purge sys/dev/dt/dt_dev.c:-1 [inline] dtclose(11e5f,81,2000,ffff80003c441258) at dtclose+0x109 sys/dev/dt/dt_dev.c:232 spec_close(ffff80002a327b00) at spec_close+0x466 sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffd8060550600,81,fffffd80097fb478,ffff80003c441258) at VOP_CLOSE+0x132 sys/kern/vfs_vops.c:156 vn_closefile(fffffd80632f4de0,ffff80003c441258) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd80632f4de0,ffff80003c441258) at vn_closefile+0x12b sys/kern/vfs_vnops.c:615 fdrop(fffffd80632f4de0,ffff80003c441258) at fdrop+0x121 sys/kern/kern_descrip.c:1280 closef(fffffd80632f4de0,ffff80003c441258) at closef+0x192 sys/kern/kern_descrip.c:1264 fdfree(ffff80003c441258) at fdfree+0x116 sys/kern/kern_descrip.c:1195 exit1(ffff80003c441258,0,0,1) at exit1+0x576 sys/kern/kern_exit.c:215 sys_exit(ffff80003c441258,ffff80002a327e70,ffff80002a327dc0) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff80002a327e70) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80002a327e70) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:748 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7381a87a7530, count: 242 End of stack trace. WARNING: SPL NOT LOWERED ON SYSCALL 83 -1947952304 EXIT 0 4 Stopped at savectx+0xae: movl $0,%gs:0x688 TID PID UID PRFLAGS PFLAGS CPU COMMAND * 61228 19726 0 0 0 1 syz-executor 195420 78406 0 0 0 0 syz-executor savectx() at savectx+0xae end of kernel end trace frame: 0x7ea82d1ca7b0, 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(0xfffffd80604a0028, 0x0, 0, 1) -> e ddb{1}> trace savectx() at savectx+0xae end of kernel end trace frame: 0x7ea82d1ca7b0, count: -1 ddb{1}> show registers rdi 0 rsi 0 rbp 0xffff80003c4a3840 rbx 0 rdx 0 rcx 0xffff80002a315260 rax 0x3c r8 0xffff80003c4a3770 r9 0x1 r10 0xff114746e2c8a2f8 r11 0xc5ba137c5e842828 r12 0 r13 0 r14 0xffff80002a315260 r15 0 rip 0xffffffff824b93ee savectx+0xae cs 0x8 rflags 0x46 rsp 0xffff80003c4a37c0 ss 0 savectx+0xae: movl $0,%gs:0x688 ddb{1}> show proc PROC (syz-executor) tid=61228 pid=19726 tcnt=3 stat=onproc flags process=0 proc=0 runpri=86, usrpri=86, slppri=17, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff80002a3154f8,0xffff80002a314fd8 process=0xffff80003c024e90 user=0xffff80003c49e000, vmspace=0xfffffd80604a07c8 estcpu=36, cpticks=2, pctcpu=0.0, user=1, sys=1, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND *19726 61228 89673 0 7 0 syz-executor 19726 62800 89673 0 3 0x4000080 fsleep syz-executor 19726 57484 89673 0 3 0x4000080 fsleep syz-executor 78406 195420 84579 0 7 0 syz-executor 78406 263604 84579 0 3 0x4000080 bell syz-executor 27179 139717 210 0 2 0 syz-executor 27179 477011 210 0 3 0x4000080 fsleep syz-executor 62997 304930 63146 0 2 0 syz-executor 62997 182648 63146 0 3 0x4000080 fsleep syz-executor 70251 516779 27719 0 2 0 syz-executor 70251 428701 27719 0 3 0x4000080 fsleep syz-executor 70251 261071 27719 0 3 0x4000080 fsleep syz-executor 12471 419555 28302 0 3 0x80 nanoslp syz-executor 12471 41435 28302 0 3 0x4000080 piperd syz-executor 12471 322500 28302 0 3 0x4000080 piperd syz-executor 12471 17637 28302 0 3 0x4000080 fsleep syz-executor 63146 185853 78189 0 3 0x82 nanoslp syz-executor 45011 299301 0 0 3 0x14280 nfsidl nfsio 17099 476886 0 0 3 0x14200 acct acct 27719 298217 78189 0 3 0x82 nanoslp syz-executor 84579 365266 78189 0 3 0x82 nanoslp syz-executor 69836 215872 78189 0 3 0x82 nanoslp syz-executor 95269 316118 0 0 3 0x14200 bored sosplice 28302 125997 78189 0 3 0x82 nanoslp syz-executor 210 41366 78189 0 3 0x82 nanoslp syz-executor 89673 131196 78189 0 3 0x82 nanoslp syz-executor 2755 277518 78189 0 3 0x2 biowait syz-executor 78189 76047 24262 0 3 0x82 kqread syz-executor 24262 517702 13649 0 3 0x10008a sigsusp ksh 13649 109598 71900 0 3 0x98 kqread sshd-session 71900 266335 74803 0 3 0x92 kqread sshd-session 43678 26228 1 0 3 0x100083 ttyopn getty 74803 490945 1 0 3 0x88 kqread sshd 48896 216931 92162 74 3 0x1100092 bpf pflogd 92162 420141 1 0 3 0x80 sbwait pflogd 76933 438233 87327 73 3 0x1100090 kqread syslogd 87327 287368 1 0 3 0x100082 sbwait syslogd 43754 141223 1 0 3 0x100080 kqread resolvd 49956 105128 95215 77 3 0x100092 kqread dhcpleased 22671 510710 95215 77 3 0x100092 kqread dhcpleased 95215 361021 1 0 3 0x80 kqread dhcpleased 36884 378699 0 0 3 0x14200 bored smr 95737 473774 0 0 2 0x14200 zerothread 10624 2263 0 0 3 0x14200 aiodoned aiodoned 88756 193879 0 0 3 0x14200 syncer update 96137 101561 0 0 3 0x14200 cleaner cleaner 10911 18998 0 0 3 0x14200 reaper reaper 58459 267030 0 0 3 0x14200 pgdaemon pagedaemon 78627 497537 0 0 3 0x14200 bored viomb 32824 294625 0 0 3 0x40014200 acpi0 acpi0 43841 371744 0 0 3 0x40014200 idle1 95068 457359 0 0 3 0x14200 bored softnet7 10951 123806 0 0 3 0x14200 bored softnet6 58991 253483 0 0 3 0x14200 bored softnet5 73239 417716 0 0 3 0x14200 bored softnet4 13936 433698 0 0 3 0x14200 bored softnet3 57786 373140 0 0 3 0x14200 bored softnet2 25468 251076 0 0 3 0x14200 bored softnet1 65789 157268 0 0 3 0x14200 netlock softnet0 4941 411589 0 0 2 0x40014200 systqmp 57833 377460 0 0 3 0x14200 bored systq 55871 460635 0 0 3 0x14200 tmoslp softclockmp 7359 106859 0 0 3 0x40014200 tmoslp softclock 96075 280324 0 0 3 0x40014200 idle0 1 488381 0 0 3 0x80082 wait init 0 0 -1 0 3 0x10010200 scheduler swapper ddb{1}> show all locks Process 2755 (syz-executor) thread 0xffff8000ffff3c98 (277518) ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10238 11093K 11806K 166960K 12966 0 pcb 17 14K 20K 166960K 282 0 rtable 180 9K 10K 166960K 586 0 pf 39 18K 67486K 166960K 197 0 ifaddr 38 7K 8K 166960K 143 0 ifgroup 59 2K 2K 166960K 232 0 sysctl 4 1K 9K 166960K 21 0 counters 70 37K 37K 166960K 252 0 ioctlops 0 0K 4K 166960K 1783 0 iov 0 0K 32K 166960K 100 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1453 91K 92K 166960K 2673 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 5K 166960K 12 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 1K 166960K 78 0 dirhash 12 2K 2K 166960K 36 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 17 61K 236K 166960K 1665 0 sigio 0 0K 0K 166960K 46 0 proc 75 131K 164K 166960K 826 0 subproc 72 4K 4K 166960K 108 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 265 0 in_multi 81 5K 7K 166960K 215 0 ether_multi 1 0K 0K 166960K 16 0 mrt 1 0K 0K 166960K 11 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 103 466K 466K 166960K 103 0 exec 0 0K 1K 166960K 581 0 fusefs mount 1 32K 32K 166960K 1 0 pfkey data 0 0K 0K 166960K 2 0 tdb 3 0K 0K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 248 169K 183K 166960K 16565 0 UVM aobj 36 3K 3K 166960K 39 0 pinsyscall 42 84K 103K 166960K 2854 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 103 0 NDP 13 0K 2K 166960K 95 0 temp 76 8652K 8732K 166960K 66288 0 kqueue 14 22K 29K 166960K 315 0 SYN cache 2 8K 16K 166960K 3 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 120 282 0 279 3 2 1 3 0 8 0 rtentry 176 188 0 120 5 0 5 5 0 8 0 unpcb 144 1432 0 1411 11 9 2 6 0 8 1 syncache 336 9 0 9 4 3 1 1 0 8 1 tcpqe 32 1 0 1 1 1 0 1 0 8 0 tcpcb 736 512 0 507 9 2 7 7 0 8 6 arp 128 24 0 15 1 0 1 1 0 8 0 inpcb 328 1636 0 1628 20 13 7 12 0 8 6 nd6 144 32 0 14 1 0 1 1 0 8 0 pkpcb 40 21 0 21 3 2 1 1 0 8 1 kcovpl 48 12 0 4 1 0 1 1 0 8 0 ppxss 1192 68 0 68 2 1 1 1 0 8 1 pppxif 1504 11 0 11 2 1 1 1 0 8 1 pffrag 232 14 0 8 1 0 1 1 0 482 0 pffrnode 88 7 0 3 1 0 1 1 0 8 0 pffrent 40 36 0 26 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 pfrktable 1344 2 0 2 2 2 0 1 0 8 0 pfstitem 24 32 0 16 1 0 1 1 0 8 0 pfstkey 128 32 0 16 1 0 1 1 0 8 0 pfstate 384 30 0 16 3 0 3 3 0 8 0 pfrule 1344 61 0 55 2 1 1 2 0 8 0 rttmr 136 2 0 2 2 2 0 1 0 8 0 art_heap8 4096 2 0 0 2 0 2 2 0 8 0 art_heap4 256 878 0 511 33 6 27 29 0 8 0 art_table 40 880 0 511 5 0 5 5 0 8 0 art_node 32 188 0 131 1 0 1 1 0 8 0 sysvmsgpl 40 13 0 6 1 0 1 1 0 8 0 semupl 112 4 0 4 2 2 0 1 0 8 0 semapl 112 69 0 59 1 0 1 1 0 8 0 shmpl 112 36 0 3 1 0 1 1 0 8 0 dirhash 1024 34 0 17 3 0 3 3 0 8 0 dino2pl 256 4458 0 2949 95 0 95 95 0 8 0 ffsino 296 4458 0 2949 117 0 117 117 0 8 0 nchpl 144 6771 0 6212 64 38 26 64 0 8 1 rtmask 32 15 0 15 4 3 1 1 0 8 1 uvmvnodes 80 5230 0 0 107 0 107 107 0 8 0 vnodes 216 5230 0 0 291 0 291 291 0 8 0 namei 1024 22511 0 22511 1 0 1 1 0 8 1 percpumem 16 141 0 91 1 0 1 1 0 8 0 kstatmem 264 142 0 112 3 0 3 3 0 8 0 scsiplug 72 8 0 8 3 2 1 1 0 8 1 scxspl 216 38780 0 38779 11 10 1 8 1 8 0 plimitpl 152 366 0 349 1 0 1 1 0 8 0 sigapl 424 1960 0 1904 7 0 7 7 0 8 0 knotepl 120 569 0 0 17 0 17 17 0 8 0 kqueuepl 224 603 0 593 10 8 2 5 0 8 1 pipepl 344 346 0 317 7 4 3 6 0 8 0 fdescpl 528 1928 0 1897 3 0 3 3 0 8 0 filepl 160 12240 0 12004 29 15 14 21 0 8 2 lockfpl 104 596 0 594 1 0 1 1 0 8 0 lockfspl 48 239 0 237 1 0 1 1 0 8 0 sessionpl 144 30 0 21 1 0 1 1 0 8 0 pgrppl 48 72 0 55 1 0 1 1 0 8 0 ucredpl 104 1866 0 1852 1 0 1 1 0 8 0 zombiepl 144 1905 0 1904 1 0 1 1 0 8 0 processpl 1232 1960 0 1904 5 0 5 5 0 8 0 procpl 664 4536 0 4470 8 1 7 7 0 8 0 sosppl 168 7 0 7 4 3 1 1 0 8 1 sockpl 752 3448 0 3416 34 24 10 17 0 8 6 mcl64k 65536 5 0 0 1 0 1 1 0 8 0 mcl16k 16384 2 0 0 1 0 1 1 0 8 0 mcl12k 12288 2 0 0 1 0 1 1 0 8 0 mcl9k 9216 2 0 0 1 0 1 1 0 8 0 mcl8k 8192 4 0 0 1 0 1 1 0 8 0 mcl4k 4096 118 0 0 14 0 14 14 0 8 0 mcl2k 2048 36 0 0 5 0 5 5 0 8 0 mtagpl 96 69 0 0 2 0 2 2 0 8 0 mbufpl 256 241 0 0 14 0 14 14 0 8 0 bufpl 280 16285 0 10142 439 0 439 439 0 8 0 anonpl 32 13373 0 0 108 0 108 108 0 246 0 amapchunkpl 152 55969 0 55328 42 9 33 33 0 158 7 amappl16 200 6295 0 6258 59 41 18 28 0 8 8 amappl15 192 6 0 5 1 0 1 1 0 8 0 amappl14 184 128 0 116 1 0 1 1 0 8 0 amappl13 176 31 0 31 2 2 0 1 0 8 0 amappl12 168 2656 0 2625 4 1 3 3 0 8 0 amappl11 160 54 0 40 1 0 1 1 0 8 0 amappl10 152 6 0 6 1 1 0 1 0 8 0 amappl9 144 293 0 293 1 1 0 1 0 8 0 amappl8 136 26 0 23 1 0 1 1 0 8 0 amappl7 128 134 0 121 1 0 1 1 0 8 0 amappl6 120 223 0 219 1 0 1 1 0 8 0 amappl5 112 151 0 141 1 0 1 1 0 8 0 amappl4 104 307 0 287 1 0 1 1 0 8 0 amappl3 96 11449 0 11330 4 0 4 4 0 8 0 amappl2 88 726 0 663 2 0 2 2 0 8 0 amappl1 80 15526 0 14911 17 2 15 15 0 8 0 amappl 88 15556 0 15382 5 0 5 5 0 92 0 dma8192 8192 2 0 2 1 1 0 1 0 8 0 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 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 7 0 7 2 2 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 38 0 3 1 0 1 1 0 8 0 uaddrrnd 24 1928 0 1897 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 1928 0 1897 1 0 1 1 0 8 0 vmmpekpl 168 16466 0 16415 3 0 3 3 0 8 0 vmmpepl 168 125702 0 123664 134 21 113 113 0 357 12 vmsppl 488 1927 0 1897 6 1 5 5 0 8 0 rwobjpl 80 39033 0 32801 135 2 133 133 0 8 0 pdppl 4096 3864 0 3794 116 44 72 86 0 8 2 pvpl 32 20812 0 0 168 0 168 168 0 265 0 pmappl 256 1927 0 1897 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 308 0 60 8 0 8 8 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp x86_ipi_db(ffffffff837e3ff0) 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 __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0xb kd_curproc sys/dev/kcov.c:580 [inline] __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0xb sys/dev/kcov.c:153 softintr_dispatch(2) at softintr_dispatch+0x125 sys/kern/kern_softintr.c:83 dosoftint(2) at dosoftint+0x54 sys/arch/amd64/amd64/intr.c:847 Xsofttty() at Xsofttty+0x27 __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x2c kd_curproc sys/dev/kcov.c:584 [inline] __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x2c sys/dev/kcov.c:153 __mp_lock(ffffffff838d9b80) at __mp_lock+0x1a3 __mp_lock_spin sys/kern/kern_lock.c:134 [inline] __mp_lock(ffffffff838d9b80) at __mp_lock+0x1a3 sys/kern/kern_lock.c:165 intr_handler(ffff80003c4656f0,ffff800000079a80) at intr_handler+0xe9 sys/arch/amd64/amd64/intr.c:559 Xintr_ioapic_edge23_untramp() at Xintr_ioapic_edge23_untramp+0x18f end of kernel end trace frame: 0x7a3fbadad0c0, count: 4 ddb{0}> trace x86_ipi_db(ffffffff837e3ff0) 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 __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0xb kd_curproc sys/dev/kcov.c:580 [inline] __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0xb sys/dev/kcov.c:153 softintr_dispatch(2) at softintr_dispatch+0x125 sys/kern/kern_softintr.c:83 dosoftint(2) at dosoftint+0x54 sys/arch/amd64/amd64/intr.c:847 Xsofttty() at Xsofttty+0x27 __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x2c kd_curproc sys/dev/kcov.c:584 [inline] __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x2c sys/dev/kcov.c:153 __mp_lock(ffffffff838d9b80) at __mp_lock+0x1a3 __mp_lock_spin sys/kern/kern_lock.c:134 [inline] __mp_lock(ffffffff838d9b80) at __mp_lock+0x1a3 sys/kern/kern_lock.c:165 intr_handler(ffff80003c4656f0,ffff800000079a80) at intr_handler+0xe9 sys/arch/amd64/amd64/intr.c:559 Xintr_ioapic_edge23_untramp() at Xintr_ioapic_edge23_untramp+0x18f end of kernel end trace frame: 0x7a3fbadad0c0, count: -11 ddb{0}> machine ddbcpu 1 Stopped at savectx+0xae: movl $0,%gs:0x688 savectx() at savectx+0xae end of kernel end trace frame: 0x7ea82d1ca7b0, count: 14 ddb{1}> trace savectx() at savectx+0xae end of kernel end trace frame: 0x7ea82d1ca7b0, count: -1