uvm_fault(0xfffffd806b2b9b98, 0x0, 0, 1) -> e fatal page fault in supervisor mode trap type 6 code 0 rip ffffffff815c28f8 cs 8 rflags 10207 cr2 0 cpl 0 rsp ffff800038804b50 gsbase 0xffff8000299ddff0 kgsbase 0x0 panic: trap type 6, code=0, pc=ffffffff815c28f8 Starting stack trace... panic(ffffffff833e3708) at panic+0x1d0 sys/kern/subr_prf.c:229 kerntrap(ffff800038804aa0) at kerntrap+0x30b alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b dt_ioctl_record_stop(ffff80000158b000) at dt_ioctl_record_stop+0x108 sys/dev/dt/dt_dev.c:593 dtclose(11e5f,81,2000,ffff80003b000558) at dtclose+0x109 dt_pcb_purge sys/dev/dt/dt_dev.c:-1 [inline] dtclose(11e5f,81,2000,ffff80003b000558) at dtclose+0x109 sys/dev/dt/dt_dev.c:239 spec_close(ffff800038804c50) at spec_close+0x466 sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffd8068610388,81,fffffd80097fd478,ffff80003b000558) at VOP_CLOSE+0x132 sys/kern/vfs_vops.c:156 vn_closefile(fffffd806afb1af0,ffff80003b000558) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd806afb1af0,ffff80003b000558) at vn_closefile+0x12b sys/kern/vfs_vnops.c:615 fdrop(fffffd806afb1af0,ffff80003b000558) at fdrop+0x121 sys/kern/kern_descrip.c:1280 closef(fffffd806afb1af0,ffff80003b000558) at closef+0x192 sys/kern/kern_descrip.c:1264 fdfree(ffff80003b000558) at fdfree+0x116 sys/kern/kern_descrip.c:1195 exit1(ffff80003b000558,0,0,1) at exit1+0x576 sys/kern/kern_exit.c:215 sys_exit(ffff80003b000558,ffff800038804fc0,ffff800038804f10) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff800038804fc0) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff800038804fc0) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:775 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x77267958dee0, count: 242 End of stack trace. WARNING: SPL NOT LOWERED ON SYSCALL 91 778708664 EXIT 0 4 Stopped at savectx+0xae: movl $0,%gs:0x688 TID PID UID PRFLAGS PFLAGS CPU COMMAND 309342 36928 0 0 0 0 syz-executor *232105 44354 0 0x2 0 1 syz-executor savectx() at savectx+0xae end of kernel end trace frame: 0x7c872e6a26a0, 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(0xfffffd806b2b9b98, 0x0, 0, 1) -> e ddb{1}> trace savectx() at savectx+0xae end of kernel end trace frame: 0x7c872e6a26a0, count: -1 ddb{1}> show registers rdi 0 rsi 0 rbp 0xffff80002a30c1d0 rbx 0 rdx 0 rcx 0xffff8000ffffdc90 rax 0x3a r8 0xffff80002a30c100 r9 0x1 r10 0x771268306d15f396 r11 0x5c3ff60fe6aa7283 r12 0 r13 0 r14 0xffff8000ffffdc90 r15 0 rip 0xffffffff810c93ee savectx+0xae cs 0x8 rflags 0x46 rsp 0xffff80002a30c150 ss 0x10 savectx+0xae: movl $0,%gs:0x688 ddb{1}> show proc PROC (syz-executor) tid=232105 pid=44354 tcnt=1 stat=onproc flags process=2 proc=0 runpri=83, usrpri=83, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff8000ffffd9f8,0xffff8000ffffd240 process=0xffff80002a267030 user=0xffff80002a307000, vmspace=0xfffffd806f6d27a8 estcpu=33, cpticks=27, pctcpu=0.4, user=0, sys=27, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 46796 412994 8305 0 2 0 syz-executor 22402 193771 80327 0 2 0 syz-executor 22402 409282 80327 0 2 0x4000000 syz-executor 36928 309342 31748 0 7 0 syz-executor 36928 161388 31748 0 3 0x4000000 biowait syz-executor 60412 315931 18202 0 3 0x80 nanoslp syz-executor 60412 243908 18202 0 3 0x4000080 nanoslp syz-executor 60412 100108 18202 0 3 0x4000080 fsleep syz-executor 93733 191180 44354 60929 2 0x10 syz-executor 93733 473411 44354 60929 3 0x4000090 fsleep syz-executor 93733 164998 44354 60929 3 0x4000090 fsleep syz-executor 8888 122370 66366 0 3 0x80 nanoslp syz-executor 8888 19707 66366 0 3 0x4000080 sbwait syz-executor 8888 410041 66366 0 3 0x4000080 fsleep syz-executor 44801 475706 68116 0 3 0x82 nanoslp syz-executor 18202 305819 68116 0 3 0x82 nanoslp syz-executor 80327 236727 68116 0 3 0x82 nanoslp syz-executor 66366 71634 68116 0 3 0x82 nanoslp syz-executor 8305 497768 68116 0 3 0x82 nanoslp syz-executor 31748 138297 68116 0 3 0x82 nanoslp syz-executor *44354 232105 68116 0 7 0x2 syz-executor 38769 231187 68116 0 3 0x82 nanoslp syz-executor 68116 325150 48443 0 3 0x82 kqread syz-executor 48443 285550 3584 0 3 0x10008a sigsusp ksh 3584 66340 31368 0 3 0x98 kqread sshd-session 31368 52276 80858 0 3 0x92 kqread sshd-session 54 338150 1 0 3 0x100083 ttyin getty 80858 395161 1 0 3 0x88 kqread sshd 14626 364045 35813 74 3 0x1100092 bpf pflogd 35813 324794 1 0 3 0x80 sbwait pflogd 14686 509323 62713 73 3 0x1100090 kqread syslogd 62713 230203 1 0 3 0x100082 sbwait syslogd 77256 465438 1 0 3 0x100080 kqread resolvd 14949 240129 21935 77 3 0x100092 kqread dhcpleased 51366 427900 21935 77 3 0x100092 kqread dhcpleased 21935 100686 1 0 3 0x80 kqread dhcpleased 10532 160381 0 0 3 0x14200 bored smr 61502 14349 0 0 3 0x14200 pgzero zerothread 37791 496329 0 0 3 0x14200 aiodoned aiodoned 16626 33132 0 0 3 0x14200 syncer update 74015 114795 0 0 3 0x14200 cleaner cleaner 24997 394813 0 0 3 0x14200 reaper reaper 79499 50779 0 0 3 0x14200 pgdaemon pagedaemon 41935 269641 0 0 3 0x14200 bored viomb 47778 191314 0 0 3 0x40014200 acpi0 acpi0 71338 424031 0 0 3 0x40014200 idle1 86675 430751 0 0 3 0x14200 bored softnet1 93766 496460 0 0 3 0x14200 netlock softnet0 37067 439156 0 0 3 0x14200 smrbar systqmp 88015 36245 0 0 3 0x14200 bored systq 62244 200391 0 0 3 0x14200 tmoslp softclockmp 60572 486972 0 0 3 0x40014200 tmoslp softclock 35278 122831 0 0 3 0x40014200 idle0 1 111267 0 0 3 0x82 wait init 0 0 -1 0 3 0x10010200 scheduler swapper ddb{1}> show all locks Process 36928 (syz-executor) thread 0xffff80003b001a18 (161388) exclusive rrwlock inode r = 0 (0xfffffd806cd1eeb8) #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 ufs_ihashins+0x4f ufs_ihash sys/ufs/ufs/ufs_ihash.c:-1 [inline] #4 ufs_ihashins+0x4f sys/ufs/ufs/ufs_ihash.c:159 #5 ffs_vget+0x187 sys/ufs/ffs/ffs_vfsops.c:1232 #6 ffs_inode_alloc+0x279 sys/ufs/ffs/ffs_alloc.c:393 #7 ufs_makeinode+0xcd sys/ufs/ufs/ufs_vnops.c:1732 #8 ufs_mknod+0x5b sys/ufs/ufs/ufs_vnops.c:167 #9 VOP_MKNOD+0x101 sys/kern/vfs_vops.c:121 #10 domknodat+0x469 sys/kern/vfs_syscalls.c:1640 #11 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] #11 syscall+0xb17 sys/arch/amd64/amd64/trap.c:775 #12 Xsyscall+0x128 exclusive rrwlock inode r = 0 (0xfffffd806f090a10) #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 domknodat+0xb4 sys/kern/vfs_syscalls.c:1592 #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 Process 37067 (systqmp) thread 0xffff8000ffffe000 (439156) shared rwlock systqmp r = 0 (0xffffffff83822e88) #0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160 #1 taskq_thread+0x12a sys/kern/kern_task.c:442 #2 proc_trampoline+0x10 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 11105 12404K 13550K 166960K 13432 0 pcb 17 15K 16K 166960K 169 0 rtable 229 9K 9K 166960K 461 0 pf 38 18K 18K 166960K 83 0 ifaddr 43 7K 8K 166960K 73 0 ifgroup 61 2K 2K 166960K 99 0 sysctl 3 1K 9K 166960K 9 0 counters 76 37K 38K 166960K 126 0 ioctlops 0 0K 4K 166960K 1721 0 iov 0 0K 16K 166960K 16 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1464 92K 93K 166960K 1962 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 5K 166960K 6 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 0K 166960K 20 0 dirhash 12 2K 2K 166960K 24 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 18 65K 93K 166960K 574 0 sigio 0 0K 0K 166960K 7 0 proc 72 115K 164K 166960K 606 0 subproc 72 4K 4K 166960K 81 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 2 0K 0K 166960K 53 0 in_multi 88 6K 7K 166960K 126 0 ether_multi 1 0K 0K 166960K 2 0 mrt 0 0K 0K 166960K 2 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 67 307K 307K 166960K 67 0 exec 0 0K 1K 166960K 444 0 fusefs mount 1 32K 32K 166960K 1 0 pfkey data 0 0K 0K 166960K 1 0 tdb 3 0K 0K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 241 164K 177K 166960K 7362 0 UVM aobj 16 6K 6K 166960K 18 0 pinsyscall 43 86K 104K 166960K 1757 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 33 0 NDP 14 0K 2K 166960K 49 0 temp 42 8667K 8794K 166960K 33792 0 kqueue 16 26K 26K 166960K 113 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 74 0 71 1 0 1 1 0 8 0 rtentry 176 135 0 39 6 0 6 6 0 8 0 unpcb 144 280 0 261 2 1 1 2 0 8 0 syncache 336 3 0 3 1 1 0 1 0 8 0 tcpcb 736 191 0 186 10 9 1 7 0 8 0 arp 136 22 0 4 1 0 1 1 0 8 0 inpcb 328 732 0 722 9 7 2 7 0 8 0 nd6 152 29 0 7 1 0 1 1 0 8 0 pkpcb 40 2 0 2 2 2 0 1 0 8 0 kcovpl 48 9 0 1 1 0 1 1 0 8 0 ppxss 1192 24 0 22 2 1 1 1 0 8 0 pppxif 1504 2 0 2 2 2 0 1 0 8 0 pffrag 232 6 0 1 1 0 1 1 0 482 0 pffrnode 88 5 0 1 1 0 1 1 0 8 0 pffrent 40 8 0 3 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 49 0 11 1 0 1 1 0 8 0 pfstkey 128 49 0 11 2 0 2 2 0 8 0 pfstate 448 49 0 11 5 0 5 5 0 8 0 pfrule 1344 24 0 19 2 1 1 2 0 8 0 art_heap8 4096 2 0 0 2 0 2 2 0 8 0 art_heap4 256 584 0 111 32 2 30 31 0 8 0 art_table 40 586 0 111 6 0 6 6 0 8 0 art_node 32 135 0 49 1 0 1 1 0 8 0 sysvmsgpl 40 4 0 1 1 0 1 1 0 8 0 semupl 112 1 0 1 1 1 0 1 0 8 0 semapl 112 18 0 8 1 0 1 1 0 8 0 shmpl 112 13 0 2 1 0 1 1 0 8 0 dirhash 1024 25 0 8 3 0 3 3 0 8 0 dino2pl 256 2435 0 926 96 0 96 96 0 8 0 ffsino 296 2435 0 926 117 0 117 117 0 8 0 nchpl 144 3201 0 1498 64 0 64 64 0 8 0 rtmask 32 7 0 7 2 1 1 1 0 8 1 vnodes 216 2926 0 0 163 0 163 163 0 8 0 namei 1024 10621 0 10620 5 4 1 3 0 8 0 percpumem 16 78 0 25 1 0 1 1 0 8 0 vcpupl 3968 2 0 0 1 0 1 1 0 8 0 vmpool 848 2 0 0 1 0 1 1 0 8 0 kstatmem 264 62 0 30 5 2 3 3 0 8 0 scsiplug 72 1 0 1 1 1 0 1 0 8 0 scxspl 216 16227 0 16226 10 9 1 8 1 8 0 plimitpl 152 157 0 140 1 0 1 1 0 8 0 sigapl 424 893 0 845 7 1 6 7 0 8 0 knotepl 120 549 0 0 17 0 17 17 0 8 0 kqueuepl 224 176 0 163 2 1 1 2 0 8 0 pipepl 344 162 0 133 4 1 3 4 0 8 0 fdescpl 528 874 0 842 3 0 3 3 0 8 0 filepl 160 4850 0 4623 20 9 11 18 0 8 1 lockfpl 104 312 0 310 2 1 1 2 0 8 0 lockfspl 48 66 0 64 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 104 526 0 512 1 0 1 1 0 8 0 zombiepl 144 1142 0 1140 2 1 1 1 0 8 0 processpl 1232 893 0 845 5 0 5 5 0 8 0 procpl 664 1722 0 1666 6 0 6 6 0 8 0 sockpl 752 1099 0 1066 12 8 4 11 0 8 0 mcl64k 65536 2 0 0 1 0 1 1 0 8 0 mcl16k 16384 1 0 0 1 0 1 1 0 8 0 mcl12k 12288 1 0 0 1 0 1 1 0 8 0 mcl9k 9216 1 0 0 1 0 1 1 0 8 0 mcl8k 8192 2 0 0 1 0 1 1 0 8 0 mcl4k 4096 114 0 0 15 0 15 15 0 8 0 mcl2k 2048 38 0 0 4 0 4 4 0 8 0 mtagpl 96 69 0 0 2 0 2 2 0 8 0 mbufpl 256 303 0 0 19 0 19 19 0 8 0 bufpl 280 6373 0 237 439 0 439 439 0 8 0 anonpl 32 8231 0 0 67 0 67 67 0 246 0 amapchunkpl 152 23095 0 22495 40 8 32 32 0 158 4 amappl16 200 3164 0 3135 19 12 7 15 0 8 0 amappl15 192 36 0 36 1 1 0 1 0 8 0 amappl14 184 4 0 4 1 1 0 1 0 8 0 amappl13 176 445 0 444 1 0 1 1 0 8 0 amappl12 168 1266 0 1224 3 0 3 3 0 8 0 amappl11 160 11 0 11 2 2 0 1 0 8 0 amappl10 152 58 0 42 1 0 1 1 0 8 0 amappl9 144 247 0 247 1 1 0 1 0 8 0 amappl8 136 36 0 33 1 0 1 1 0 8 0 amappl7 128 98 0 97 1 0 1 1 0 8 0 amappl6 120 290 0 277 1 0 1 1 0 8 0 amappl5 112 93 0 83 1 0 1 1 0 8 0 amappl4 104 434 0 404 1 0 1 1 0 8 0 amappl3 96 4406 0 4301 5 1 4 4 0 8 0 amappl2 88 548 0 486 2 0 2 2 0 8 0 amappl1 80 10987 0 10388 15 2 13 15 0 8 0 amappl 88 6522 0 6360 5 0 5 5 0 92 0 uvmvnodes 80 113 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 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 8 0 8 2 2 0 1 0 8 0 dma16 16 18 0 17 1 0 1 1 0 8 0 aobjpl 72 17 0 2 1 0 1 1 0 8 0 uaddrrnd 24 874 0 842 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 874 0 842 1 0 1 1 0 8 0 vmmpekpl 168 8725 0 8680 3 0 3 3 0 8 0 vmmpepl 168 62495 0 60540 100 6 94 98 0 357 1 vmsppl 488 873 0 842 6 1 5 5 0 8 0 rwobjpl 80 19961 0 18907 29 1 28 28 0 8 0 pdppl 4096 1760 0 1686 117 43 74 86 0 8 0 pvpl 32 15296 0 0 125 1 124 125 0 265 0 pmappl 256 875 0 842 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 318 0 61 8 0 8 8 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp x86_ipi_db(ffffffff8381dff0) 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(ffffffff83978840) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:142 [inline] __mp_lock(ffffffff83978840) 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(ffffffff83978840) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:142 [inline] __mp_lock(ffffffff83978840) at __mp_lock+0x192 sys/kern/kern_lock.c:173 intr_handler(ffff800032bd86e0,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: 0x70eff7ba9ff0, count: 5 ddb{0}> trace x86_ipi_db(ffffffff8381dff0) 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(ffffffff83978840) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:142 [inline] __mp_lock(ffffffff83978840) 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(ffffffff83978840) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:142 [inline] __mp_lock(ffffffff83978840) at __mp_lock+0x192 sys/kern/kern_lock.c:173 intr_handler(ffff800032bd86e0,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: 0x70eff7ba9ff0, 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: 0x7c872e6a26a0, count: 14 ddb{1}> trace savectx() at savectx+0xae end of kernel end trace frame: 0x7c872e6a26a0, count: -1