uvm_fault(0xffffffff83676930, 0xffff800029aa5100, 0, 2) -> d fatal page fault in supervisor mode trap type 6 code 2 rip ffffffff82fb7152 cs 8 rflags 10202 cr2 ffff800029aa5100 cpl 0 rsp ffff80003c5d2a48 gsbase 0xffff800029b5bff0 kgsbase 0x0 panic: trap type 6, code=2, pc=ffffffff82fb7152 Starting stack trace... panic(ffffffff830490fe) at panic+0x1d0 sys/kern/subr_prf.c:229 kerntrap(ffff80003c5d2990) at kerntrap+0x29b sys/arch/amd64/amd64/trap.c:327 alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b memset() at memset+0x52 ffs_write(ffff80003c5d2d30) at ffs_write+0xbab sys/ufs/ffs/ffs_vnops.c:401 VOP_WRITE(fffffd80715953c0,ffff80003c5d2dc8,23,fffffd807f7d3478) at VOP_WRITE+0x102 sys/kern/vfs_vops.c:245 vn_rdwr(1,fffffd80715953c0,ffff80003c5d2ee0,40,0,1,c042ab3f2c44b2eb,0,1008,40) at vn_rdwr+0x12d sys/kern/vfs_vnops.c:324 acct_process(ffff8000ffff8a40) at acct_process+0x7bb sys/kern/kern_acct.c:245 exit1(ffff8000ffff8a40,0,0,1) at exit1+0x5cd sys/kern/kern_exit.c:227 sys_exit(ffff8000ffff8a40,ffff80003c5d3120,ffff80003c5d3070) at sys_exit+0x1a syscall(ffff80003c5d3120) at syscall+0xb08 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c5d3120) at syscall+0xb08 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7a72d8a5f370, count: 245 End of stack trace. WARNING: SPL NOT LOWERED ON TRAP EXIT 4 0 Stopped at proc_trampoline+0xc7: movl $0,%gs:0x680 TID PID UID PRFLAGS PFLAGS CPU COMMAND 162538 80610 0 0 0 0 syz-executor *286089 1807 0 0 0x4000000 1 syz-executor proc_trampoline() at proc_trampoline+0xc7 end of kernel end trace frame: 0xb401e603880, 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(0xffffffff83676930, 0xffff800029aa5100, 0, 2) -> d ddb{1}> trace proc_trampoline() at proc_trampoline+0xc7 end of kernel end trace frame: 0xb401e603880, count: -1 ddb{1}> show registers rdi 0 rsi 0 rbp 0xffff80003c5df360 rbx 0 rdx 0 rcx 0xffff8000ffff82a8 rax 0x2a r8 0xffff80003c5df290 r9 0x1 r10 0xfaaf83ff7fc2e5f6 r11 0xbf47d00d9b6549e7 r12 0 r13 0 r14 0 r15 0 rip 0xffffffff82e264c7 proc_trampoline+0xc7 cs 0x8 rflags 0x246 rsp 0xffff80003c5df2e0 ss 0 proc_trampoline+0xc7: movl $0,%gs:0x680 ddb{1}> show proc PROC (syz-executor) tid=286089 pid=1807 tcnt=3 stat=onproc flags process=0 proc=4000000 runpri=86, usrpri=86, slppri=17, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff8000ffff8cc8,0xffff8000ffff96f8 process=0xffff80003c687928 user=0xffff80003c5da000, vmspace=0xfffffd806bff03a8 estcpu=36, cpticks=1, pctcpu=0.0, user=0, sys=1, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 80610 162538 29339 0 7 0 syz-executor 41673 370549 1008 0 2 0 syz-executor 41673 372095 1008 0 3 0x4000080 kqpoll syz-executor 48169 311879 31302 0 3 0x80 nanoslp syz-executor 48169 84571 31302 0 3 0x4000080 ttyout syz-executor 48169 241194 31302 0 3 0x4000080 fsleep syz-executor 1807 229676 88426 0 2 0 syz-executor 1807 247945 88426 0 3 0x4000080 kqpoll syz-executor * 1807 286089 88426 0 7 0x4000000 syz-executor 38129 378043 70745 0 3 0x90 nanoslp syz-executor 38129 393002 70745 0 3 0x4000090 kqsel syz-executor 38129 499615 70745 0 3 0x4000090 fsleep syz-executor 11380 159800 0 0 3 0x14200 acct acct 82936 459150 22543 0 3 0x82 wait syz-executor 28216 307098 0 0 3 0x14280 nfsidl nfsio 47459 385382 0 0 3 0x14280 nfsidl nfsio 83977 383230 0 0 3 0x14280 nfsidl nfsio 53442 323313 0 0 3 0x14280 nfsidl nfsio 21157 440874 0 0 3 0x14280 nfsidl nfsio 16101 35946 0 0 3 0x14280 nfsidl nfsio 22902 481564 0 0 3 0x14280 nfsidl nfsio 65886 107984 0 0 3 0x14280 nfsidl nfsio 30517 511873 0 0 3 0x14280 nfsidl nfsio 43914 33687 0 0 3 0x14280 nfsidl nfsio 71037 104568 0 0 3 0x14280 nfsidl nfsio 36729 130477 0 0 3 0x14280 nfsidl nfsio 5820 280672 0 0 3 0x14280 nfsidl nfsio 68806 341833 0 0 3 0x14280 nfsidl nfsio 16956 255863 0 0 3 0x14280 nfsidl nfsio 32872 115606 0 0 3 0x14280 nfsidl nfsio 84692 57487 0 0 3 0x14280 nfsidl nfsio 90426 377404 0 0 3 0x14280 nfsidl nfsio 22147 294809 0 0 3 0x14280 nfsidl nfsio 62756 177971 0 0 3 0x14280 nfsidl nfsio 1008 17354 22543 0 3 0x82 nanoslp syz-executor 82661 463688 0 0 3 0x14200 bored sosplice 70745 26210 22543 0 3 0x82 nanoslp syz-executor 29339 110078 22543 0 3 0x82 nanoslp syz-executor 46529 47087 22543 0 3 0x82 nanoslp syz-executor 88426 68318 22543 0 3 0x82 nanoslp syz-executor 31302 297972 22543 0 3 0x82 nanoslp syz-executor 22543 134816 29049 0 3 0x82 wait syz-executor 29049 209330 36007 0 3 0x10008a sigsusp ksh 36007 262802 44448 0 3 0x98 kqread sshd-session 44448 474583 73246 0 3 0x92 kqread sshd-session 67757 393891 1 0 3 0x100083 ttyin getty 73246 497265 1 0 3 0x88 kqread sshd 83128 28365 83118 74 3 0x1100092 bpf pflogd 83118 373853 1 0 3 0x80 sbwait pflogd 87127 310105 70632 73 3 0x1100090 kqread syslogd 70632 58504 1 0 3 0x100082 sbwait syslogd 89650 106620 1 0 3 0x100080 kqread resolvd 15202 258377 42514 77 3 0x100092 kqread dhcpleased 96464 32364 42514 77 3 0x100092 kqread dhcpleased 42514 443633 1 0 3 0x80 kqread dhcpleased 78642 450494 0 0 3 0x14200 bored smr 57760 31556 0 0 2 0x14200 zerothread 74292 66121 0 0 3 0x14200 aiodoned aiodoned 57747 342944 0 0 3 0x14200 syncer update 28278 418840 0 0 3 0x14200 cleaner cleaner 85388 419805 0 0 3 0x14200 reaper reaper 37637 60592 0 0 3 0x14200 pgdaemon pagedaemon 74983 64554 0 0 3 0x14200 bored viomb 16074 125533 0 0 3 0x40014200 acpi0 acpi0 80444 91862 0 0 3 0x40014200 idle1 28555 499920 0 0 3 0x14200 bored softnet3 46703 114678 0 0 3 0x14200 bored softnet2 27289 246727 0 0 3 0x14200 bored softnet1 14887 350338 0 0 3 0x14200 bored softnet0 9062 388494 0 0 2 0x40014200 systqmp 96572 190445 0 0 3 0x14200 bored systq 42680 112686 0 0 3 0x14200 tmoslp softclockmp 12597 312767 0 0 3 0x40014200 tmoslp softclock 46070 267278 0 0 3 0x40014200 idle0 1 501138 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks Process 80610 (syz-executor) thread 0xffff8000ffff8530 (162538) exclusive rwlock uobjlk r = 0 (0xfffffd806cf9e5d8) #0 witness_lock+0x5bb stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5bb sys/kern/subr_witness.c:1155 #1 rw_do_enter_write+0x3ea sys/kern/kern_rwlock.c:316 #2 uvm_fault_lower_lookup+0x53 sys/uvm/uvm_fault.c:1175 #3 uvm_fault_lower+0x86 sys/uvm/uvm_fault.c:1310 #4 uvm_fault+0x272 #5 upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:188 #6 usertrap+0x2d8 sys/arch/amd64/amd64/trap.c:436 #7 recall_trap+0x8 shared rwlock vmmaplk r = 0 (0xfffffd806ecb5498) #0 witness_lock+0x5bb stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5bb sys/kern/subr_witness.c:1155 #1 rw_do_enter_read+0x3af sys/kern/kern_rwlock.c:405 #2 uvmfault_lookup+0x122 sys/uvm/uvm_fault.c:1864 #3 uvm_fault_check+0x4b sys/uvm/uvm_fault.c:732 #4 uvm_fault+0x106 sys/uvm/uvm_fault.c:668 #5 upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:188 #6 usertrap+0x2d8 sys/arch/amd64/amd64/trap.c:436 #7 recall_trap+0x8 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10248 11132K 11576K 166960K 14671 0 pcb 17 14K 16K 166960K 478 0 rtable 218 8K 8K 166960K 644 0 pf 40 18K 22K 166960K 121 0 ifaddr 44 7K 8K 166960K 88 0 ifgroup 64 2K 3K 166960K 121 0 sysctl 4 1K 5K 166960K 9 0 counters 68 36K 37K 166960K 104 0 ioctlops 0 0K 4K 166960K 1718 0 iov 1 0K 20K 166960K 157 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1427 90K 90K 166960K 2936 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 3 5K 9K 166960K 36 0 VM map 2 1K 1K 166960K 2 0 sem 25 5K 5K 166960K 47 0 dirhash 12 2K 2K 166960K 48 0 ACPI 1690 195K 286K 166960K 12468 0 file desc 16 57K 93K 166960K 2033 0 sigio 0 0K 0K 166960K 79 0 proc 74 91K 140K 166960K 763 0 subproc 72 4K 4K 166960K 100 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 2 0K 0K 166960K 257 0 in_multi 83 6K 7K 166960K 174 0 ether_multi 1 0K 0K 166960K 14 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 271 1208K 1208K 166960K 271 0 exec 0 0K 1K 166960K 1005 0 fusefs mount 1 32K 32K 166960K 1 0 pfkey data 0 0K 0K 166960K 6 0 tdb 3 0K 0K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 220 72K 96K 166960K 20605 0 UVM aobj 88 5K 5K 166960K 95 0 pinsyscall 42 84K 106K 166960K 3219 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 1K 166960K 143 0 NDP 14 0K 2K 166960K 56 0 temp 75 6900K 7017K 166960K 76740 0 kqueue 14 22K 32K 166960K 315 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 24 0 0 1 0 1 1 0 8 0 rtpcb 120 271 0 268 5 4 1 3 0 8 0 rtentry 112 191 0 95 4 0 4 4 0 8 0 unpcb 144 1627 0 1610 11 8 3 6 0 8 2 syncache 336 10 0 10 2 2 0 1 0 8 0 tcpqe 32 3 0 3 2 2 0 1 0 8 0 tcpcb 808 933 0 928 24 16 8 8 0 8 7 arp 120 33 0 14 1 0 1 1 0 8 0 inpcb 376 2780 0 2768 40 31 9 12 0 8 7 nd6 136 41 0 16 1 0 1 1 0 8 0 pkpcb 40 14 0 14 3 3 0 1 0 8 0 kcovpl 48 11 0 3 1 0 1 1 0 8 0 ppxss 1168 12 0 11 3 2 1 1 0 8 0 pffrag 232 10 0 2 1 0 1 1 0 482 0 pffrnode 88 10 0 2 1 0 1 1 0 8 0 pffrent 40 15 0 7 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 pfanchor 1288 1 0 0 1 0 1 1 0 8 0 pftag 88 1 0 1 1 1 0 1 0 8 0 pfqueue 320 1 0 1 1 1 0 1 0 8 0 pfstitem 24 70 0 39 1 0 1 1 0 8 0 pfstkey 128 72 0 41 2 0 2 2 0 8 0 pfstate 376 71 0 40 6 1 5 6 0 8 0 pfrule 1344 32 0 24 2 1 1 2 0 8 0 art_heap8 4096 3 0 0 3 0 3 3 0 8 0 art_heap4 256 775 0 357 32 5 27 31 0 8 0 art_table 32 778 0 357 4 0 4 4 0 8 0 art_node 16 185 0 104 1 0 1 1 0 8 0 sysvmsgpl 40 19 0 6 1 0 1 1 0 8 0 semupl 112 3 0 3 3 2 1 1 0 8 1 semapl 112 43 0 20 1 0 1 1 0 8 0 shmpl 112 92 0 7 3 0 3 3 0 8 0 dirhash 1024 43 0 26 3 0 3 3 0 8 0 dino2pl 256 4914 0 3411 95 0 95 95 0 8 0 ffsino 280 4914 0 3411 109 0 109 109 0 8 0 nchpl 144 7764 0 6069 64 0 64 64 0 8 0 uvmvnodes 80 5926 0 0 121 0 121 121 0 8 0 vnodes 216 5926 0 0 330 0 330 330 0 8 0 namei 1024 28043 0 28043 4 3 1 2 0 8 1 percpumem 16 66 0 18 1 0 1 1 0 8 0 kstatmem 264 64 0 36 3 0 3 3 0 8 1 scsiplug 72 9 0 9 4 4 0 1 0 8 0 scxspl 216 24162 0 24162 13 12 1 8 1 8 1 plimitpl 152 537 0 520 1 0 1 1 0 8 0 sigapl 424 2356 0 2285 10 1 9 9 0 8 0 futexpl 64 31344 0 31342 1 0 1 1 0 8 0 knotepl 120 595 0 0 18 0 18 18 0 8 0 kqueuepl 216 562 0 550 6 1 5 5 0 8 4 pipepl 328 351 0 324 6 3 3 6 0 8 0 fdescpl 504 2313 0 2283 5 0 5 5 0 8 0 filepl 152 15868 0 15649 21 7 14 17 0 8 3 lockfpl 104 561 0 558 1 0 1 1 0 8 0 lockfspl 48 236 0 233 1 0 1 1 0 8 0 sessionpl 144 31 0 22 1 0 1 1 0 8 0 pgrppl 48 105 0 88 1 0 1 1 0 8 0 ucredpl 104 2824 0 2810 1 0 1 1 0 8 0 zombiepl 144 2437 0 2434 1 0 1 1 0 8 0 processpl 1168 2356 0 2285 7 1 6 6 0 8 0 procpl 648 5447 0 5369 8 0 8 8 0 8 0 srpgc 96 11 0 11 4 4 0 1 0 8 0 sosppl 168 7 0 7 3 3 0 1 0 8 0 sockpl 688 4715 0 4683 43 31 12 15 0 8 8 mcl64k 65536 6 0 0 1 0 1 1 0 8 0 mcl16k 16384 5 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 5 0 0 1 0 1 1 0 8 0 mcl4k 4096 122 0 0 15 0 15 15 0 8 0 mcl2k 2048 45 0 0 5 0 5 5 0 8 0 mtagpl 96 266 0 0 7 0 7 7 0 8 0 mbufpl 256 620 0 0 38 0 38 38 0 8 0 bufpl 280 6651 0 485 441 0 441 441 0 8 0 anonpl 24 295285 0 290882 80 36 44 54 0 185 7 amapchunkpl 152 66873 0 66357 40 11 29 31 0 158 6 amappl16 200 5961 0 5921 38 33 5 16 0 8 1 amappl15 192 57 0 57 1 1 0 1 0 8 0 amappl14 184 158 0 146 1 0 1 1 0 8 0 amappl13 176 9 0 9 2 2 0 1 0 8 0 amappl12 168 3022 0 2992 4 1 3 3 0 8 0 amappl11 160 57 0 43 1 0 1 1 0 8 0 amappl10 152 5 0 5 1 1 0 1 0 8 0 amappl9 144 249 0 248 2 1 1 1 0 8 0 amappl8 136 22 0 19 1 0 1 1 0 8 0 amappl7 128 118 0 105 1 0 1 1 0 8 0 amappl6 120 221 0 217 1 0 1 1 0 8 0 amappl5 112 138 0 127 1 0 1 1 0 8 0 amappl4 104 357 0 337 1 0 1 1 0 8 0 amappl3 96 14045 0 13939 4 0 4 4 0 8 0 amappl2 88 738 0 675 2 0 2 2 0 8 0 amappl1 80 15094 0 14515 14 0 14 14 0 8 0 amappl 88 20028 0 19863 5 0 5 5 0 92 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 128 255 0 255 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 19 0 18 1 0 1 1 0 8 0 aobjpl 72 94 0 7 2 0 2 2 0 8 0 uaddrrnd 24 2313 0 2282 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 2313 0 2282 1 0 1 1 0 8 0 vmmpekpl 168 19462 0 19412 3 0 3 3 0 8 0 vmmpepl 168 145074 0 143196 105 14 91 98 0 357 0 vmsppl 456 2312 0 2282 6 1 5 5 0 8 0 rwobjpl 64 43540 0 36579 113 0 113 113 0 8 0 pdppl 4096 4633 0 4564 121 50 71 87 0 8 2 pvpl 32 16815 0 0 137 1 136 136 0 265 0 pmappl 248 2312 0 2282 3 0 3 3 0 8 0 extentpl 40 55 0 38 1 0 1 1 0 8 0 phpool 112 363 0 81 9 0 9 9 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp x86_ipi_db(ffffffff834e6ff0) at x86_ipi_db+0x27 sys/arch/amd64/amd64/db_interface.c:393 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(ffffffff835ead70) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:113 [inline] __mp_lock(ffffffff835ead70) at __mp_lock+0x192 sys/kern/kern_lock.c:144 intr_handler(ffff800039978880,ffff800000079a00) at intr_handler+0xe1 sys/arch/amd64/amd64/intr.c:553 Xintr_ioapic_edge18_untramp() at Xintr_ioapic_edge18_untramp+0x18f __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc softintr_dispatch(0) at softintr_dispatch+0x5b sys/arch/amd64/amd64/softintr.c:88 Xsoftclock() at Xsoftclock+0x27 __mp_lock(ffffffff835ead70) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:113 [inline] __mp_lock(ffffffff835ead70) at __mp_lock+0x192 sys/kern/kern_lock.c:144 syscall(ffff800039978bb0) at syscall+0xae6 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff800039978bb0) at syscall+0xae6 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x78892d61f740, count: 3 ddb{0}> trace x86_ipi_db(ffffffff834e6ff0) at x86_ipi_db+0x27 sys/arch/amd64/amd64/db_interface.c:393 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(ffffffff835ead70) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:113 [inline] __mp_lock(ffffffff835ead70) at __mp_lock+0x192 sys/kern/kern_lock.c:144 intr_handler(ffff800039978880,ffff800000079a00) at intr_handler+0xe1 sys/arch/amd64/amd64/intr.c:553 Xintr_ioapic_edge18_untramp() at Xintr_ioapic_edge18_untramp+0x18f __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc softintr_dispatch(0) at softintr_dispatch+0x5b sys/arch/amd64/amd64/softintr.c:88 Xsoftclock() at Xsoftclock+0x27 __mp_lock(ffffffff835ead70) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:113 [inline] __mp_lock(ffffffff835ead70) at __mp_lock+0x192 sys/kern/kern_lock.c:144 syscall(ffff800039978bb0) at syscall+0xae6 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff800039978bb0) at syscall+0xae6 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x78892d61f740, count: -12 ddb{0}> machine ddbcpu 1 Stopped at proc_trampoline+0xc7: movl $0,%gs:0x680 proc_trampoline() at proc_trampoline+0xc7 end of kernel end trace frame: 0xb401e603880, count: 14 ddb{1}> trace proc_trampoline() at proc_trampoline+0xc7 end of kernel end trace frame: 0xb401e603880, count: -1