uvm_fault(0xfffffd806b2989a8, 0x0, 0, 1) -> e fatal page fault in supervisor mode trap type 6 code 0 rip ffffffff831def38 cs 8 rflags 10207 cr2 0 cpl 0 rsp ffff80003c478eb0 gsbase 0xffff8000299edff0 kgsbase 0x0 panic: trap type 6, code=0, pc=ffffffff831def38 Starting stack trace... panic(ffffffff833a4594) at panic+0x1d0 sys/kern/subr_prf.c:229 kerntrap(ffff80003c478e00) at kerntrap+0x30b alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b dt_ioctl_record_stop(ffff80000147c000) at dt_ioctl_record_stop+0x108 sys/dev/dt/dt_dev.c:586 dtclose(11e5f,81,2000,ffff80003b0082b8) at dtclose+0x109 dt_pcb_purge sys/dev/dt/dt_dev.c:-1 [inline] dtclose(11e5f,81,2000,ffff80003b0082b8) at dtclose+0x109 sys/dev/dt/dt_dev.c:232 spec_close(ffff80003c478fb0) at spec_close+0x466 sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffd806a96f998,81,fffffd80097fb680,ffff80003b0082b8) at VOP_CLOSE+0x132 sys/kern/vfs_vops.c:156 vn_closefile(fffffd800cdadc00,ffff80003b0082b8) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd800cdadc00,ffff80003b0082b8) at vn_closefile+0x12b sys/kern/vfs_vnops.c:615 fdrop(fffffd800cdadc00,ffff80003b0082b8) at fdrop+0x121 sys/kern/kern_descrip.c:1280 closef(fffffd800cdadc00,ffff80003b0082b8) at closef+0x192 sys/kern/kern_descrip.c:1264 fdfree(ffff80003b0082b8) at fdfree+0x116 sys/kern/kern_descrip.c:1195 exit1(ffff80003b0082b8,0,0,1) at exit1+0x576 sys/kern/kern_exit.c:215 sys_exit(ffff80003b0082b8,ffff80003c479320,ffff80003c479270) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff80003c479320) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c479320) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:748 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x6fa32edfeea0, count: 242 End of stack trace. WARNING: SPL NOT LOWERED ON SYSCALL 110 53 EXIT 0 4 Stopped at savectx+0xae: movl $0,%gs:0x688 TID PID UID PRFLAGS PFLAGS CPU COMMAND 476849 47145 0 0x10000002 0 0 syz-executor *217871 85780 0 0x2 0 1 syz-executor savectx() at savectx+0xae end of kernel end trace frame: 0x766d3d71f050, 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}> ddb{1}> set $lines = 0 ddb{1}> set $maxwidth = 0 ddb{1}> show panic *cpu1: uvm_fault(0xfffffd806b2989a8, 0x0, 0, 1) -> e ddb{1}> trace savectx() at savectx+0xae end of kernel end trace frame: 0x766d3d71f050, count: -1 ddb{1}> show registers rdi 0 rsi 0 rbp 0xffff80002a29eb60 rbx 0 rdx 0 rcx 0xffff80002a272a70 rax 0x34 r8 0xffff80002a29ea90 r9 0x1 r10 0x3766b074aa28194e r11 0xf3fa57dde7ba0fc9 r12 0 r13 0 r14 0xffff80002a272a70 r15 0 rip 0xffffffff82ec33ee savectx+0xae cs 0x8 rflags 0x46 rsp 0xffff80002a29eae0 ss 0x10 savectx+0xae: movl $0,%gs:0x688 ddb{1}> show proc PROC (syz-executor) tid=217871 pid=85780 tcnt=1 stat=onproc flags process=2 proc=0 runpri=82, usrpri=82, slppri=24, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff80002a2722a8,0xffff8000ffffc548 process=0xffff8000ffff3030 user=0xffff80002a299000, vmspace=0xfffffd806e3cb5c8 estcpu=32, cpticks=446, pctcpu=0.58, user=10, sys=317, intr=119 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 20911 84608 46865 0 2 0 syz-executor 22049 108866 107 0 2 0 syz-executor 22049 23277 107 0 3 0x4000080 fsleep syz-executor 97873 301727 26428 0 2 0 syz-executor 97873 302989 26428 0 3 0x4000080 pipewr syz-executor 99488 87870 17555 0 2 0 syz-executor 99488 450958 17555 0 3 0x4000080 fsleep syz-executor 99488 57634 17555 0 2 0x4000000 syz-executor 4594 369241 48287 0 2 0 syz-executor 4594 99299 48287 0 2 0x4000000 syz-executor 4594 401305 48287 0 3 0x4000080 fsleep syz-executor 63534 91357 85780 0 2 0x2 syz-executor 7446 500348 0 0 3 0x14280 nfsidl nfsio 20117 66682 0 0 3 0x14280 nfsidl nfsio 54583 41573 0 0 3 0x14280 nfsidl nfsio 28727 446332 0 0 3 0x14280 nfsidl nfsio 12437 418179 6078 0 3 0x82 sbwait sshd-session 47145 476849 85780 0 7 0x10000002 syz-executor 48287 130957 85780 0 2 0xc82 syz-executor 13232 32084 6078 0 3 0x82 sbwait sshd-session 17555 78705 85780 0 3 0x82 nanoslp syz-executor 26428 399535 85780 0 3 0x82 nanoslp syz-executor 50914 331389 85780 0 3 0x82 nanoslp syz-executor 46865 389938 85780 0 3 0x82 nanoslp syz-executor 7416 174122 1 0 3 0x100083 ttyin getty 93487 196558 0 0 3 0x14200 bored sosplice 107 206012 85780 0 3 0x82 nanoslp syz-executor *85780 217871 14319 0 7 0x2 syz-executor 14319 121044 25192 0 3 0x10008a sigsusp ksh 25192 348326 37775 0 3 0x98 kqread sshd-session 37775 495821 6078 0 3 0x92 kqread sshd-session 6078 464409 1 0 3 0x88 kqread sshd 69284 50003 80339 74 3 0x1100092 bpf pflogd 80339 88111 1 0 3 0x80 sbwait pflogd 47856 481350 28242 73 3 0x1100090 kqread syslogd 28242 521101 1 0 3 0x100082 sbwait syslogd 48373 122481 1 0 3 0x100080 kqread resolvd 72203 65305 22071 77 3 0x100092 kqread dhcpleased 9069 77444 22071 77 3 0x100092 kqread dhcpleased 22071 64600 1 0 3 0x80 kqread dhcpleased 39836 284335 0 0 3 0x14200 bored smr 55113 133640 0 0 2 0x14200 zerothread 32559 92800 0 0 3 0x14200 aiodoned aiodoned 78924 115372 0 0 3 0x14200 syncer update 7942 64292 0 0 3 0x14200 cleaner cleaner 60839 240698 0 0 3 0x14200 reaper reaper 93625 249702 0 0 3 0x14200 pgdaemon pagedaemon 36657 515589 0 0 3 0x14200 bored viomb 14163 41848 0 0 3 0x40014200 acpi0 acpi0 2337 47226 0 0 3 0x40014200 idle1 66432 292119 0 0 3 0x14200 bored softnet1 13298 108420 0 0 3 0x14200 netlock softnet0 88627 275401 0 0 2 0x40014200 systqmp 35773 521050 0 0 3 0x14200 bored systq 9453 324235 0 0 3 0x14200 tmoslp softclockmp 50907 300100 0 0 3 0x40014200 tmoslp softclock 84736 38225 0 0 3 0x40014200 idle0 1 123300 0 0 3 0x80082 wait init 0 0 -1 0 3 0x10010200 scheduler swapper ddb{1}> show all locks Process 4594 (syz-executor) thread 0xffff8000fffef240 (99299) exclusive rrwlock inode r = 0 (0xfffffd806b94dd98) #0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160 #1 rw_do_enter_write+0x419 sys/kern/kern_rwlock.c:320 #2 rrw_enter+0xc6 sys/kern/kern_rwlock.c:621 #3 VOP_LOCK+0xa3 sys/kern/vfs_vops.c:527 #4 vn_lock+0xa4 sys/kern/vfs_vnops.c:570 #5 vn_write+0x18f sys/kern/vfs_vnops.c:405 #6 dofilewritev+0x242 sys/kern/sys_generic.c:380 #7 sys_write+0xa2 sys/kern/sys_generic.c:300 #8 syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] #8 syscall+0xbd4 sys/arch/amd64/amd64/trap.c:748 #9 Xsyscall+0x128 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10250 11141K 11496K 166960K 15486 0 pcb 19 14K 30K 166960K 642 0 rtable 199 11K 12K 166960K 954 0 pf 34 17K 19K 166960K 275 0 ifaddr 36 6K 9K 166960K 232 0 ifgroup 55 2K 2K 166960K 367 0 sysctl 4 1K 9K 166960K 36 0 counters 68 36K 38K 166960K 352 0 ioctlops 0 0K 4K 166960K 2047 0 iov 0 0K 40K 166960K 159 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1395 88K 88K 166960K 3478 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 3 5K 13K 166960K 35 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 0K 166960K 99 0 dirhash 12 2K 2K 166960K 51 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 16 57K 240K 166960K 2787 0 sigio 0 0K 0K 166960K 52 0 proc 72 115K 164K 166960K 1286 0 subproc 72 4K 4K 166960K 243 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 279 0 in_multi 60 4K 7K 166960K 363 0 ether_multi 1 0K 0K 166960K 12 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 229 1023K 1023K 166960K 229 0 exec 0 0K 1K 166960K 1237 0 fusefs mount 1 32K 32K 166960K 1 0 pfkey data 0 0K 0K 166960K 5 0 tdb 3 0K 0K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 248 177K 188K 166960K 26647 0 UVM aobj 131 6K 6K 166960K 136 0 pinsyscall 45 90K 102K 166960K 4391 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 150 0 NDP 12 0K 2K 166960K 171 0 temp 82 8656K 8912K 166960K 138192 0 kqueue 13 20K 30K 166960K 465 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 120 307 0 304 3 2 1 3 0 8 0 rtentry 176 335 0 265 5 0 5 5 0 8 0 unpcb 144 2091 0 2070 18 14 4 4 0 8 3 syncache 336 16 0 16 5 5 0 1 0 8 0 tcpqe 32 3 0 3 1 1 0 1 0 8 0 tcpcb 736 975 0 963 25 18 7 7 0 8 5 arp 136 39 0 28 1 0 1 1 0 8 0 ipq 40 1 0 1 1 1 0 1 0 8 0 ipqe 40 3 0 3 1 1 0 1 0 8 0 inpcb 328 2854 0 2837 29 22 7 10 0 8 5 nd6 152 64 0 52 1 0 1 1 0 8 0 pkpcb 40 19 0 19 5 4 1 1 0 8 1 kcovpl 48 27 0 19 1 0 1 1 0 8 0 mppekey 1024 1 0 1 1 1 0 1 0 8 0 ppxss 1192 101 0 101 4 3 1 1 0 8 1 pppxif 1504 12 0 12 5 4 1 1 0 8 1 pffrag 232 18 0 9 1 0 1 1 0 482 0 pffrnode 88 18 0 9 1 0 1 1 0 8 0 pffrent 40 43 0 34 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 24 158 0 87 1 0 1 1 0 8 0 pfstkey 128 158 0 87 3 0 3 3 0 8 0 pfstate 384 158 0 87 8 0 8 8 0 8 0 pfrule 1344 22 0 17 2 1 1 2 0 8 0 rttmr 136 1 0 1 1 1 0 1 0 8 0 art_heap8 4096 5 0 0 5 0 5 5 0 8 0 art_heap4 256 1489 0 1203 33 10 23 31 0 8 0 art_table 40 1494 0 1203 5 0 5 5 0 8 0 art_node 32 329 0 272 1 0 1 1 0 8 0 sysvmsgpl 40 3 0 1 1 0 1 1 0 8 0 semupl 112 1 0 1 1 1 0 1 0 8 0 semapl 112 95 0 85 1 0 1 1 0 8 0 shmpl 112 133 0 5 4 0 4 4 0 8 0 dirhash 1024 43 0 26 3 0 3 3 0 8 0 dino2pl 256 6160 0 4620 97 0 97 97 0 8 0 ffsino 296 6160 0 4620 119 0 119 119 0 8 0 nchpl 144 9805 0 9153 64 38 26 64 0 8 0 rtmask 32 18 0 18 6 5 1 1 0 8 1 uvmvnodes 80 4902 0 0 101 0 101 101 0 8 0 vnodes 216 4902 0 0 273 0 273 273 0 8 0 namei 1024 37313 0 37313 3 2 1 2 0 8 1 percpumem 16 191 0 142 1 0 1 1 0 8 0 kstatmem 264 240 0 212 4 1 3 3 0 8 0 scsiplug 72 7 0 7 5 4 1 1 0 8 1 scxspl 216 56140 0 56140 25 22 3 8 1 8 3 plimitpl 152 1050 0 1032 1 0 1 1 0 8 0 sigapl 424 3042 0 2988 7 0 7 7 0 8 0 knotepl 120 597 0 0 17 0 17 17 0 8 0 kqueuepl 224 1017 0 1008 14 13 1 5 0 8 0 pipepl 344 465 0 436 11 7 4 9 0 8 0 fdescpl 528 3011 0 2979 3 0 3 3 0 8 0 filepl 160 20301 0 20065 38 25 13 21 0 8 0 lockfpl 104 1530 0 1526 2 1 1 2 0 8 0 lockfspl 48 695 0 691 1 0 1 1 0 8 0 sessionpl 144 54 0 43 1 0 1 1 0 8 0 pgrppl 48 148 0 129 1 0 1 1 0 8 0 ucredpl 104 3184 0 3170 1 0 1 1 0 8 0 zombiepl 144 3533 0 3531 1 0 1 1 0 8 0 processpl 1232 3042 0 2988 5 0 5 5 0 8 0 procpl 664 7288 0 7228 6 0 6 6 0 8 0 sosppl 168 21 0 21 8 7 1 1 0 8 1 sockpl 752 5447 0 5406 44 32 12 14 0 8 7 mcl64k 65536 17 0 0 3 0 3 3 0 8 0 mcl16k 16384 3 0 0 1 0 1 1 0 8 0 mcl12k 12288 2 0 0 1 0 1 1 0 8 0 mcl9k 9216 1 0 0 1 0 1 1 0 8 0 mcl8k 8192 3 0 0 1 0 1 1 0 8 0 mcl4k 4096 120 0 0 15 0 15 15 0 8 0 mcl2k 2048 51 0 0 5 0 5 5 0 8 0 mtagpl 96 12 0 0 1 0 1 1 0 8 0 mbufpl 256 1204 0 0 73 0 73 73 0 8 0 bufpl 280 23923 0 17780 440 0 440 440 0 8 0 anonpl 32 12409 0 0 101 0 101 101 0 246 0 amapchunkpl 152 90491 0 89974 60 32 28 32 0 158 0 amappl16 200 9881 0 9844 69 56 13 27 0 8 2 amappl15 192 38 0 38 2 2 0 1 0 8 0 amappl14 184 181 0 167 1 0 1 1 0 8 0 amappl13 176 4 0 3 1 0 1 1 0 8 0 amappl12 168 3974 0 3942 3 1 2 2 0 8 0 amappl11 160 56 0 41 1 0 1 1 0 8 0 amappl10 152 13 0 13 2 2 0 1 0 8 0 amappl9 144 268 0 268 1 1 0 1 0 8 0 amappl8 136 26 0 21 1 0 1 1 0 8 0 amappl7 128 155 0 141 1 0 1 1 0 8 0 amappl6 120 378 0 372 1 0 1 1 0 8 0 amappl5 112 215 0 205 1 0 1 1 0 8 0 amappl4 104 389 0 368 1 0 1 1 0 8 0 amappl3 96 15978 0 15887 4 0 4 4 0 8 0 amappl2 88 3378 0 3286 3 0 3 3 0 8 0 amappl1 80 23012 0 22239 20 2 18 18 0 8 0 amappl 88 25167 0 25003 5 0 5 5 0 92 0 dma32768 32768 1 0 1 1 1 0 1 0 8 0 dma8192 8192 1 0 1 1 1 0 1 0 8 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 7 0 7 2 2 0 1 0 8 0 dma128 128 256 0 256 4 3 1 1 0 8 1 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 72 135 0 5 3 0 3 3 0 8 0 uaddrrnd 24 3011 0 2979 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 3011 0 2979 1 0 1 1 0 8 0 vmmpekpl 168 23521 0 23462 4 0 4 4 0 8 0 vmmpepl 168 196356 0 194108 148 36 112 117 0 357 4 vmsppl 488 3010 0 2979 5 0 5 5 0 8 0 rwobjpl 80 57341 0 51172 137 3 134 134 0 8 0 pdppl 4096 6030 0 5958 146 68 78 82 0 8 6 pvpl 32 20735 0 0 166 0 166 166 0 265 0 pmappl 256 3010 0 2979 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 425 0 109 10 0 10 10 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp x86_ipi_db(ffffffff837d7ff0) 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(ffffffff83988bd0) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:134 [inline] __mp_lock(ffffffff83988bd0) at __mp_lock+0x192 sys/kern/kern_lock.c:165 scsi_xs_put(fffffd8065f541d8) at scsi_xs_put+0x51 scsi_iopool_put sys/scsi/scsi_base.c:270 [inline] scsi_xs_put(fffffd8065f541d8) at scsi_xs_put+0x51 scsi_io_put sys/scsi/scsi_base.c:499 [inline] scsi_xs_put(fffffd8065f541d8) at scsi_xs_put+0x51 sys/scsi/scsi_base.c:787 scsi_done(fffffd8065f541d8) at scsi_done+0x40 sys/scsi/scsi_base.c:1496 vioscsi_vq_done(ffff8000000a3668) at vioscsi_vq_done+0xe1 sys/dev/pv/vioscsi.c:-1 intr_handler(ffff80003c47fc10,ffff800000079a80) at intr_handler+0x125 sys/arch/amd64/amd64/intr.c:563 Xintr_ioapic_edge23_untramp() at Xintr_ioapic_edge23_untramp+0x18f __mp_lock(ffffffff83988bd0) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:134 [inline] __mp_lock(ffffffff83988bd0) at __mp_lock+0x192 sys/kern/kern_lock.c:165 syscall(ffff80003c47fde0) at syscall+0xaf4 mi_syscall sys/sys/syscall_mi.h:175 [inline] syscall(ffff80003c47fde0) at syscall+0xaf4 sys/arch/amd64/amd64/trap.c:748 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7292379f6170, count: 3 ddb{0}> trace x86_ipi_db(ffffffff837d7ff0) 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(ffffffff83988bd0) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:134 [inline] __mp_lock(ffffffff83988bd0) at __mp_lock+0x192 sys/kern/kern_lock.c:165 scsi_xs_put(fffffd8065f541d8) at scsi_xs_put+0x51 scsi_iopool_put sys/scsi/scsi_base.c:270 [inline] scsi_xs_put(fffffd8065f541d8) at scsi_xs_put+0x51 scsi_io_put sys/scsi/scsi_base.c:499 [inline] scsi_xs_put(fffffd8065f541d8) at scsi_xs_put+0x51 sys/scsi/scsi_base.c:787 scsi_done(fffffd8065f541d8) at scsi_done+0x40 sys/scsi/scsi_base.c:1496 vioscsi_vq_done(ffff8000000a3668) at vioscsi_vq_done+0xe1 sys/dev/pv/vioscsi.c:-1 intr_handler(ffff80003c47fc10,ffff800000079a80) at intr_handler+0x125 sys/arch/amd64/amd64/intr.c:563 Xintr_ioapic_edge23_untramp() at Xintr_ioapic_edge23_untramp+0x18f __mp_lock(ffffffff83988bd0) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:134 [inline] __mp_lock(ffffffff83988bd0) at __mp_lock+0x192 sys/kern/kern_lock.c:165 syscall(ffff80003c47fde0) at syscall+0xaf4 mi_syscall sys/sys/syscall_mi.h:175 [inline] syscall(ffff80003c47fde0) at syscall+0xaf4 sys/arch/amd64/amd64/trap.c:748 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7292379f6170, count: -12 ddb{0}> machine ddbcpu 1 Stopped at savectx+0xae: movl $0,%gs:0x688 savectx() at savectx+0xae end of kernel end trace frame: 0x766d3d71f050, count: 14 ddb{1}> trace savectx() at savectx+0xae end of kernel end trace frame: 0x766d3d71f050, count: -1