uvm_fault(0xfffffd800b0633d0, 0x0, 0, 1) -> e fatal page fault in supervisor mode trap type 6 code 0 rip ffffffff81252bc8 cs 8 rflags 10207 cr2 0 cpl 0 rsp ffff80003affd4b0 gsbase 0xffff8000299ddff0 kgsbase 0x0 panic: trap type 6, code=0, pc=ffffffff81252bc8 Starting stack trace... panic(ffffffff833dc6e8) at panic+0x1d0 sys/kern/subr_prf.c:229 kerntrap(ffff80003affd400) at kerntrap+0x30b alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b dt_ioctl_record_stop(ffff80000158d000) at dt_ioctl_record_stop+0x108 sys/dev/dt/dt_dev.c:593 dtclose(11e5f,81,2000,ffff80003c417a18) at dtclose+0x109 dt_pcb_purge sys/dev/dt/dt_dev.c:-1 [inline] dtclose(11e5f,81,2000,ffff80003c417a18) at dtclose+0x109 sys/dev/dt/dt_dev.c:239 spec_close(ffff80003affd5b0) at spec_close+0x466 sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffd805f690440,81,fffffd80097fd5b0,ffff80003c417a18) at VOP_CLOSE+0x132 sys/kern/vfs_vops.c:156 vn_closefile(fffffd800f8cbba0,ffff80003c417a18) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd800f8cbba0,ffff80003c417a18) at vn_closefile+0x12b sys/kern/vfs_vnops.c:615 fdrop(fffffd800f8cbba0,ffff80003c417a18) at fdrop+0x121 sys/kern/kern_descrip.c:1280 closef(fffffd800f8cbba0,ffff80003c417a18) at closef+0x192 sys/kern/kern_descrip.c:1264 fdfree(ffff80003c417a18) at fdfree+0x116 sys/kern/kern_descrip.c:1195 exit1(ffff80003c417a18,0,0,1) at exit1+0x576 sys/kern/kern_exit.c:215 sys_exit(ffff80003c417a18,ffff80003affd920,ffff80003affd870) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff80003affd920) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003affd920) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:775 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x74114e0a0bf0, 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 435240 86474 0 0 0 0 syz-executor *290352 25743 0 0x2 0 1 syz-executor savectx() at savectx+0xae end of kernel end trace frame: 0x7214a6ca7260, 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(0xfffffd800b0633d0, 0x0, 0, 1) -> e ddb{1}> trace savectx() at savectx+0xae end of kernel end trace frame: 0x7214a6ca7260, count: -1 ddb{1}> show registers rdi 0 rsi 0 rbp 0xffff80002a328830 rbx 0 rdx 0 rcx 0xffff8000ffffd9f8 rax 0x33 r8 0xffff80002a328760 r9 0x1 r10 0xe912f7a44269f54e r11 0xc70e75dca023d818 r12 0 r13 0 r14 0xffff8000ffffd9f8 r15 0 rip 0xffffffff820f53ee savectx+0xae cs 0x8 rflags 0x46 rsp 0xffff80002a3287b0 ss 0x10 savectx+0xae: movl $0,%gs:0x688 ddb{1}> show proc PROC (syz-executor) tid=290352 pid=25743 tcnt=1 stat=onproc flags process=2 proc=0 runpri=50, usrpri=50, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff8000ffffca68,0xffff8000ffffd770 process=0xffff8000ffff6b58 user=0xffff80002a323000, vmspace=0xfffffd806f6c67a8 estcpu=36, cpticks=14, pctcpu=0.0, user=0, sys=14, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 51135 167474 92906 0 2 0 syz-executor 86474 435240 25743 0 7 0 syz-executor 86474 494214 25743 0 3 0x4000080 fsleep syz-executor 86474 114297 25743 0 2 0x4000000 syz-executor 28308 379332 69893 0 2 0 syz-executor 28308 429749 69893 0 2 0x4000000 syz-executor 28308 448827 69893 0 2 0x4000000 syz-executor 61962 48283 84142 0 2 0 syz-executor 61962 398874 84142 0 3 0x4000080 fsleep syz-executor 27504 288960 91071 0 2 0 syz-executor 27504 307487 91071 0 3 0x4000080 fsleep syz-executor 82368 266829 15175 0 2 0 syz-executor 82368 250904 15175 0 3 0x4000080 fsleep syz-executor 60037 102299 25104 0 3 0x4081000 biowait syz-executor 60037 49152 25104 0 3 0x4081000 inode syz-executor 60037 123079 25104 0 3 0x4081000 inode syz-executor 60037 155752 25104 0 3 0x4003000 suspend syz-executor 73216 154576 0 0 3 0x14280 nfsidl nfsio 93918 258194 0 0 3 0x14280 nfsidl nfsio 23694 207951 0 0 3 0x14280 nfsidl nfsio 58436 468783 0 0 3 0x14280 nfsidl nfsio 15175 278274 14562 0 2 0x2 syz-executor 47523 357928 14562 0 3 0x82 nanoslp syz-executor 25104 274434 14562 0 3 0x82 wait syz-executor 69893 56248 14562 0 3 0x82 nanoslp syz-executor 84142 365512 14562 0 2 0x2 syz-executor *25743 290352 14562 0 7 0x2 syz-executor 91071 126897 14562 0 3 0x82 nanoslp syz-executor 92906 103646 14562 0 3 0x82 nanoslp syz-executor 14562 343750 20873 0 3 0x82 kqread syz-executor 20873 507628 68272 0 3 0x10008a sigsusp ksh 68272 71538 10272 0 3 0x98 kqread sshd-session 10272 274603 51244 0 3 0x92 kqread sshd-session 22268 486666 1 0 3 0x100083 ttyopn getty 51244 210762 1 0 3 0x88 kqread sshd 45810 325690 64686 74 3 0x1100092 bpf pflogd 64686 368351 1 0 3 0x80 sbwait pflogd 47761 365754 86293 73 3 0x1100090 kqread syslogd 86293 393989 1 0 3 0x100082 sbwait syslogd 63042 32748 1 0 3 0x100080 kqread resolvd 6331 433991 12939 77 3 0x100092 kqread dhcpleased 32927 355363 12939 77 3 0x100092 kqread dhcpleased 12939 360190 1 0 3 0x80 kqread dhcpleased 94312 39144 0 0 3 0x14200 bored smr 81396 252555 0 0 3 0x14200 pgzero zerothread 97157 122911 0 0 3 0x14200 aiodoned aiodoned 88587 201234 0 0 3 0x14200 syncer update 34109 247820 0 0 3 0x14200 cleaner cleaner 14080 148454 0 0 3 0x14200 reaper reaper 19610 15315 0 0 3 0x14200 pgdaemon pagedaemon 73266 393852 0 0 3 0x14200 bored viomb 43657 182964 0 0 3 0x40014200 acpi0 acpi0 16807 283339 0 0 3 0x40014200 idle1 27414 447926 0 0 3 0x14200 bored softnet1 83721 98985 0 0 3 0x14200 netlock softnet0 51174 338521 0 0 2 0x40014200 systqmp 89937 44297 0 0 3 0x14200 bored systq 43593 440377 0 0 3 0x14200 tmoslp softclockmp 71841 323958 0 0 3 0x40014200 tmoslp softclock 34559 61519 0 0 3 0x40014200 idle0 1 451734 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks Process 60037 (syz-executor) thread 0xffff80003c417780 (102299) exclusive rrwlock inode r = 0 (0xfffffd806c935b48) #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+0xbd 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:775 #9 Xsyscall+0x128 Process 60037 (syz-executor) thread 0xffff80003c417cb0 (49152) exclusive rrwlock inode r = 0 (0xfffffd806c9356a8) #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+0xbd sys/kern/vfs_vops.c:527 #4 vn_lock+0xa4 sys/kern/vfs_vnops.c:570 #5 vfs_lookup+0x11c sys/kern/vfs_lookup.c:-1 #6 namei+0x7ca sys/kern/vfs_lookup.c:250 #7 dorenameat+0x91 sys/kern/vfs_syscalls.c:2990 #8 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] #8 syscall+0xb17 sys/arch/amd64/amd64/trap.c:775 #9 Xsyscall+0x128 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 11104 12209K 12556K 166960K 12912 0 pcb 17 12K 20K 166960K 117 0 rtable 239 8K 9K 166960K 410 0 pf 33 17K 19K 166960K 72 0 ifaddr 39 6K 8K 166960K 61 0 ifgroup 51 2K 2K 166960K 86 0 sysctl 1 1K 9K 166960K 6 0 counters 68 36K 37K 166960K 98 0 ioctlops 0 0K 4K 166960K 1537 0 iov 0 0K 16K 166960K 24 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1339 84K 85K 166960K 1776 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 5K 166960K 7 0 VM map 2 1K 1K 166960K 2 0 sem 16 136K 136K 166960K 21 0 dirhash 12 2K 2K 166960K 15 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 18 65K 110K 166960K 499 0 sigio 0 0K 0K 166960K 9 0 proc 75 131K 180K 166960K 570 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 38 0 in_multi 88 6K 7K 166960K 124 0 ether_multi 1 0K 0K 166960K 6 0 mrt 2 0K 0K 166960K 4 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 259 1155K 1155K 166960K 259 0 exec 0 0K 1K 166960K 408 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 254 173K 181K 166960K 6516 0 UVM aobj 12 4K 4K 166960K 12 0 pinsyscall 43 86K 104K 166960K 1654 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 38 0 NDP 11 0K 2K 166960K 40 0 temp 76 8680K 8751K 166960K 15996 0 kqueue 17 24K 30K 166960K 81 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 120 133 0 130 3 2 1 3 0 8 0 rtentry 176 119 0 15 6 0 6 6 0 8 0 unpcb 144 386 0 368 6 5 1 6 0 8 0 syncache 336 4 0 4 2 2 0 1 0 8 0 tcpcb 736 117 0 113 4 3 1 4 0 8 0 arp 136 20 0 2 1 0 1 1 0 8 0 inpcb 328 560 0 550 8 6 2 7 0 8 0 nd6 152 26 0 3 1 0 1 1 0 8 0 pkpcb 40 3 0 3 1 1 0 1 0 8 0 kcovpl 48 8 0 0 1 0 1 1 0 8 0 ppxss 1192 11 0 11 1 1 0 1 0 8 0 pppxif 1504 3 0 3 2 2 0 1 0 8 0 pfstscr 40 2 0 2 1 1 0 1 0 8 0 pffrag 232 4 0 0 1 0 1 1 0 482 0 pffrnode 88 4 0 0 1 0 1 1 0 8 0 pffrent 40 6 0 2 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 pfqueue 320 2 0 2 1 1 0 1 0 8 0 pfstitem 24 46 0 12 1 0 1 1 0 8 0 pfstkey 128 47 0 13 2 0 2 2 0 8 0 pfstate 448 47 0 13 5 0 5 5 0 8 0 pfrule 1344 21 0 16 2 1 1 2 0 8 0 rttmr 136 1 0 1 1 1 0 1 0 8 0 art_heap8 4096 3 0 0 3 0 3 3 0 8 0 art_heap4 256 469 0 56 29 2 27 29 0 8 0 art_table 40 472 0 56 5 0 5 5 0 8 0 art_node 32 119 0 24 1 0 1 1 0 8 0 sysvmsgpl 40 5 0 3 1 0 1 1 0 8 0 semupl 112 2 0 2 1 1 0 1 0 8 0 semapl 112 16 0 2 1 0 1 1 0 8 0 shmpl 112 8 0 0 1 0 1 1 0 8 0 dirhash 1024 19 0 2 3 0 3 3 0 8 0 dino2pl 256 2347 0 841 95 0 95 95 0 8 0 ffsino 296 2347 0 841 117 0 117 117 0 8 0 nchpl 144 3033 0 1330 64 0 64 64 0 8 0 vnodes 216 2611 0 0 146 0 146 146 0 8 0 namei 1024 10397 0 10395 1 0 1 1 0 8 0 percpumem 16 64 0 15 1 0 1 1 0 8 0 vcpupl 3968 1 0 0 1 0 1 1 0 8 0 vmpool 848 1 0 0 1 0 1 1 0 8 0 kstatmem 264 46 0 22 3 1 2 3 0 8 0 scsiplug 72 1 0 1 1 1 0 1 0 8 0 scxspl 216 11669 0 11667 10 9 1 8 1 8 0 plimitpl 152 161 0 141 1 0 1 1 0 8 0 sigapl 424 815 0 763 7 1 6 7 0 8 0 knotepl 120 559 0 0 17 0 17 17 0 8 0 kqueuepl 224 129 0 117 2 1 1 2 0 8 0 pipepl 344 149 0 121 3 0 3 3 0 8 0 fdescpl 528 795 0 763 3 0 3 3 0 8 0 filepl 160 4977 0 4747 20 10 10 20 0 8 0 lockfpl 104 128 0 125 1 0 1 1 0 8 0 lockfspl 48 61 0 58 1 0 1 1 0 8 0 sessionpl 144 23 0 14 1 0 1 1 0 8 0 pgrppl 48 37 0 20 1 0 1 1 0 8 0 ucredpl 104 902 0 888 1 0 1 1 0 8 0 zombiepl 144 764 0 763 2 1 1 1 0 8 0 processpl 1232 815 0 763 5 0 5 5 0 8 0 procpl 664 1449 0 1386 6 0 6 6 0 8 0 sosppl 176 3 0 3 1 1 0 1 0 8 0 sockpl 752 1125 0 1094 20 16 4 17 0 8 0 mcl64k 65536 2 0 0 1 0 1 1 0 8 0 mcl12k 12288 1 0 0 1 0 1 1 0 8 0 mcl8k 8192 3 0 0 1 0 1 1 0 8 0 mcl4k 4096 114 0 0 15 0 15 15 0 8 0 mcl2k 2048 39 0 0 5 0 5 5 0 8 0 mtagpl 96 35 0 0 1 0 1 1 0 8 0 mbufpl 256 265 0 0 17 0 17 17 0 8 0 bufpl 280 4187 0 130 290 0 290 290 0 8 0 anonpl 32 9298 0 0 75 0 75 75 0 246 0 amapchunkpl 152 20911 0 20209 41 5 36 36 0 158 6 amappl16 200 3189 0 3087 17 11 6 14 0 8 0 amappl15 192 3 0 3 1 1 0 1 0 8 0 amappl14 184 10 0 10 1 1 0 1 0 8 0 amappl13 176 434 0 433 1 0 1 1 0 8 0 amappl12 168 1161 0 1119 3 0 3 3 0 8 0 amappl11 160 6 0 6 1 1 0 1 0 8 0 amappl10 152 102 0 87 1 0 1 1 0 8 0 amappl9 144 251 0 251 1 1 0 1 0 8 0 amappl8 136 38 0 36 1 0 1 1 0 8 0 amappl7 128 87 0 86 1 0 1 1 0 8 0 amappl6 120 283 0 269 1 0 1 1 0 8 0 amappl5 112 79 0 69 1 0 1 1 0 8 0 amappl4 104 439 0 408 1 0 1 1 0 8 0 amappl3 96 3795 0 3686 5 1 4 4 0 8 0 amappl2 88 549 0 488 2 0 2 2 0 8 0 amappl1 80 10965 0 10377 16 3 13 15 0 8 0 amappl 88 5708 0 5533 5 0 5 5 0 92 0 uvmvnodes 80 110 0 0 3 0 3 3 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 dma512 512 1 0 1 1 1 0 1 0 8 0 dma256 256 6 0 6 1 1 0 1 0 8 0 dma128 128 254 0 254 2 2 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 11 0 0 1 0 1 1 0 8 0 uaddrrnd 24 795 0 763 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 795 0 763 1 0 1 1 0 8 0 vmmpekpl 168 8199 0 8159 4 1 3 3 0 8 0 vmmpepl 168 58082 0 56050 96 7 89 96 0 357 0 vmsppl 488 794 0 763 6 2 4 5 0 8 0 rwobjpl 80 18895 0 17769 28 4 24 27 0 8 0 pdppl 4096 1599 0 1527 109 37 72 85 0 8 0 pvpl 32 16393 0 0 134 1 133 133 0 265 0 pmappl 256 795 0 763 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 297 0 47 8 0 8 8 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp x86_ipi_db(ffffffff8386bff0) 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(ffffffff83951300) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:142 [inline] __mp_lock(ffffffff83951300) 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(ffffffff83951300) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:142 [inline] __mp_lock(ffffffff83951300) at __mp_lock+0x192 sys/kern/kern_lock.c:173 intr_handler(ffff8000353db010,ffff8000002a3480) at intr_handler+0xe9 sys/arch/amd64/amd64/intr.c:560 Xintr_ioapic_edge23_untramp() at Xintr_ioapic_edge23_untramp+0x18f end of kernel end trace frame: 0x7214a6ca7260, count: 5 ddb{0}> trace x86_ipi_db(ffffffff8386bff0) 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(ffffffff83951300) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:142 [inline] __mp_lock(ffffffff83951300) 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(ffffffff83951300) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:142 [inline] __mp_lock(ffffffff83951300) at __mp_lock+0x192 sys/kern/kern_lock.c:173 intr_handler(ffff8000353db010,ffff8000002a3480) at intr_handler+0xe9 sys/arch/amd64/amd64/intr.c:560 Xintr_ioapic_edge23_untramp() at Xintr_ioapic_edge23_untramp+0x18f end of kernel end trace frame: 0x7214a6ca7260, count: -10 ddb{0}> machine ddbcpu 1 Stopped at savectx+0xae: movl $0,%gs:0x688 savectx() at savectx+0xae end of kernel end trace frame: 0x7214a6ca7260, count: 14 ddb{1}> trace savectx() at savectx+0xae end of kernel end trace frame: 0x7214a6ca7260, count: -1