uvm_fault(0xfffffd807efff730, 0x0, 0, 1) -> e kernel: page fault trap, code=0 Stopped at uvm_fault_lower+0xbb1: movq 0(%rbx),%rdi TID PID UID PRFLAGS PFLAGS CPU COMMAND *283975 13067 32767 0x10 0x4000000 0K syz-executor.0 224216 13067 32767 0x10 0x4000000 1 syz-executor.0 uvm_fault_lower(ffff8000246d45f0,ffff8000246d4628,ffff8000246d4570,0) at uvm_fault_lower+0xbb1 sys/uvm/uvm_fault.c:1325 uvm_fault(fffffd807efff730,20000000,0,2) at uvm_fault+0x24f sys/uvm/uvm_fault.c:640 kpageflttrap(ffff8000246d4780,20000080) at kpageflttrap+0x1fd sys/arch/amd64/amd64/trap.c:264 kerntrap(ffff8000246d4780) at kerntrap+0xef sys/arch/amd64/amd64/trap.c:318 alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b copyout() at copyout+0x53 syscall(ffff8000246d49c0) at syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff8000246d49c0) at syscall+0x489 sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x502459e8490, count: 7 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{0}> ddb{0}> set $lines = 0 ddb{0}> set $maxwidth = 0 ddb{0}> show panic *cpu0: uvm_fault(0xfffffd807efff730, 0x0, 0, 1) -> e ddb{0}> trace uvm_fault_lower(ffff8000246d45f0,ffff8000246d4628,ffff8000246d4570,0) at uvm_fault_lower+0xbb1 sys/uvm/uvm_fault.c:1325 uvm_fault(fffffd807efff730,20000000,0,2) at uvm_fault+0x24f sys/uvm/uvm_fault.c:640 kpageflttrap(ffff8000246d4780,20000080) at kpageflttrap+0x1fd sys/arch/amd64/amd64/trap.c:264 kerntrap(ffff8000246d4780) at kerntrap+0xef sys/arch/amd64/amd64/trap.c:318 alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b copyout() at copyout+0x53 syscall(ffff8000246d49c0) at syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff8000246d49c0) at syscall+0x489 sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x502459e8490, count: -8 ddb{0}> show registers rdi 0 rsi 0 rbp 0xffff8000246d44e0 rbx 0 rdx 0 rcx 0x8 rax 0xffff800021193a48 r8 0xffffffff81a8edde witness_assert+0x1fe r9 0x5 r10 0xba12f2b4fbc06e05 r11 0x13962dc3522095 r12 0xffff8000246d45f0 r13 0xfffffd806f87d000 r14 0 r15 0xffffffff81b25d00 uvn_flush+0x950 rip 0xffffffff817b9101 uvm_fault_lower+0xbb1 cs 0x8 rflags 0x10246 __ALIGN_SIZE+0xf246 rsp 0xffff8000246d4450 ss 0x10 uvm_fault_lower+0xbb1: movq 0(%rbx),%rdi ddb{0}> show proc PROC (syz-executor.0) pid=283975 stat=onproc flags process=10 proc=4000000 pri=72, usrpri=72, nice=20 forw=0xffffffffffffffff, list=0xffff8000fffee7e0,0xffff8000211efd00 process=0xffff8000ffffa570 user=0xffff8000246cf000, vmspace=0xfffffd807efff730 estcpu=36, cpticks=0, pctcpu=0.0 user=0, sys=0, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 13067 38274 6193 32767 2 0x10 syz-executor.0 13067 421984 6193 32767 3 0x4000090 fsleep syz-executor.0 13067 456364 6193 32767 2 0x4000010 syz-executor.0 *13067 283975 6193 32767 7 0x4000010 syz-executor.0 13067 224216 6193 32767 7 0x4000010 syz-executor.0 47658 338740 95169 32767 3 0x90 nanoslp syz-executor.1 47658 433675 95169 32767 3 0x4000090 ttyretype syz-executor.1 47658 91438 95169 32767 3 0x4000090 fsleep syz-executor.1 47658 27523 95169 32767 3 0x4000090 fsleep syz-executor.1 95169 148594 51085 32767 3 0x90 nanoslp syz-executor.1 51085 425797 93108 0 3 0x82 wait syz-executor.1 6193 178760 36992 32767 3 0x90 nanoslp syz-executor.0 36992 72618 93108 0 3 0x82 wait syz-executor.0 27420 97877 0 0 3 0x14200 bored sosplice 93108 147710 39744 0 3 0x82 thrsleep syz-fuzzer 93108 444695 39744 0 3 0x4000082 nanoslp syz-fuzzer 93108 510683 39744 0 3 0x4000082 thrsleep syz-fuzzer 93108 463896 39744 0 3 0x4000082 thrsleep syz-fuzzer 93108 493816 39744 0 3 0x4000082 kqread syz-fuzzer 93108 309951 39744 0 3 0x4000082 thrsleep syz-fuzzer 93108 271140 39744 0 3 0x4000082 thrsleep syz-fuzzer 93108 496961 39744 0 3 0x4000082 thrsleep syz-fuzzer 93108 512113 39744 0 3 0x4000082 thrsleep syz-fuzzer 39744 459115 40508 0 3 0x10008a sigsusp ksh 40508 35768 16446 0 3 0x9a kqread sshd 87427 46251 1 0 3 0x100083 ttyin getty 16446 34919 1 0 3 0x88 kqread sshd 55885 80612 30529 73 3 0x100090 kqread syslogd 30529 163949 1 0 3 0x100082 netio syslogd 3339 331734 1 0 3 0x100080 kqread resolvd 89569 64871 65305 77 3 0x100092 kqread dhcpleased 22259 298596 65305 77 3 0x100092 kqread dhcpleased 65305 347173 1 0 3 0x80 kqread dhcpleased 45160 83026 0 0 3 0x14200 bored smr 15087 206279 0 0 3 0x14200 pgzero zerothread 38027 336055 0 0 3 0x14200 aiodoned aiodoned 14714 399810 0 0 3 0x14200 syncer update 4474 20163 0 0 3 0x14200 cleaner cleaner 33660 488842 0 0 3 0x14200 reaper reaper 92353 509361 0 0 3 0x14200 pgdaemon pagedaemon 48652 30079 0 0 3 0x14200 bored viomb 86204 234668 0 0 3 0x40014200 acpi0 acpi0 24594 506110 0 0 3 0x40014200 idle1 40355 71011 0 0 3 0x14200 bored softnet 41645 319457 0 0 3 0x14200 bored systqmp 47033 183919 0 0 3 0x14200 bored systq 46751 33270 0 0 3 0x40014200 bored softclock 81492 520922 0 0 3 0x40014200 idle0 1 302458 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks CPU 1: exclusive mutex &pmap->pm_mtx r = 0 (0xfffffd806e7369c8) #0 witness_lock+0x4b0 stacktrace_save sys/sys/stacktrace.h:36 [inline] #0 witness_lock+0x4b0 sys/kern/subr_witness.c:1182 #1 mtx_enter_try+0x100 #2 mtx_enter+0x4b sys/kern/kern_lock.c:266 #3 pmap_extract+0x87 sys/arch/amd64/amd64/pmap.c:1517 #4 uvm_fault_upper_lookup+0x129 sys/uvm/uvm_fault.c:854 #5 uvm_fault+0x139 sys/uvm/uvm_fault.c:607 #6 upageflttrap+0x82 sys/arch/amd64/amd64/trap.c:181 #7 usertrap+0x214 sys/arch/amd64/amd64/trap.c:403 #8 recall_trap+0x8 Process 13067 (syz-executor.0) thread 0xffff800021193a48 (283975) exclusive kernel_lock &kernel_lock r = 1 (0xffffffff828b70b8) #0 witness_lock+0x4b0 stacktrace_save sys/sys/stacktrace.h:36 [inline] #0 witness_lock+0x4b0 sys/kern/subr_witness.c:1182 #1 uvm_fault+0x233 sys/uvm/uvm_fault.c:639 #2 kpageflttrap+0x1fd sys/arch/amd64/amd64/trap.c:264 #3 kerntrap+0xef sys/arch/amd64/amd64/trap.c:318 #4 alltraps_kern_meltdown+0x7b #5 copyout+0x53 #6 syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline] #6 syscall+0x489 sys/arch/amd64/amd64/trap.c:585 #7 Xsyscall+0x128 exclusive rwlock fdlock r = 0 (0xfffffd806f168c00) #0 witness_lock+0x4b0 stacktrace_save sys/sys/stacktrace.h:36 [inline] #0 witness_lock+0x4b0 sys/kern/subr_witness.c:1182 #1 dopipe+0xd6 #2 syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline] #2 syscall+0x489 sys/arch/amd64/amd64/trap.c:585 #3 Xsyscall+0x128 Process 13067 (syz-executor.0) thread 0xffff8000211efcf0 (224216) exclusive rwlock amaplk r = 0 (0xfffffd8065e70a28) #0 witness_lock+0x4b0 stacktrace_save sys/sys/stacktrace.h:36 [inline] #0 witness_lock+0x4b0 sys/kern/subr_witness.c:1182 #1 uvm_fault_check+0x3d2 sys/uvm/uvm_fault.c:776 #2 uvm_fault+0x102 sys/uvm/uvm_fault.c:602 #3 upageflttrap+0x82 sys/arch/amd64/amd64/trap.c:181 #4 usertrap+0x214 sys/arch/amd64/amd64/trap.c:403 #5 recall_trap+0x8 shared rwlock vmmaplk r = 0 (0xfffffd807efff748) #0 witness_lock+0x4b0 stacktrace_save sys/sys/stacktrace.h:36 [inline] #0 witness_lock+0x4b0 sys/kern/subr_witness.c:1182 #1 uvmfault_lookup+0xe9 sys/uvm/uvm_fault.c:1745 #2 uvm_fault_check+0x3a sys/uvm/uvm_fault.c:676 #3 uvm_fault+0x102 sys/uvm/uvm_fault.c:602 #4 upageflttrap+0x82 sys/arch/amd64/amd64/trap.c:181 #5 usertrap+0x214 sys/arch/amd64/amd64/trap.c:403 #6 recall_trap+0x8 ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10161 6395K 6416K 78643K 11289 0 pcb 13 8K 8K 78643K 13 0 rtable 114 3K 4K 78643K 1086 0 ifaddr 39 10K 10K 78643K 125 0 sysctl 2 0K 0K 78643K 2 0 counters 44 34K 34K 78643K 68 0 ioctlops 0 0K 2K 78643K 187 0 iov 0 0K 24K 78643K 495 0 mount 1 1K 1K 78643K 1 0 log 0 0K 0K 78643K 5 0 vnodes 1208 76K 76K 78643K 3195 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 5K 78643K 75 0 VM map 2 1K 1K 78643K 2 0 sem 12 0K 1K 78643K 2533 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1697 195K 286K 78643K 12598 0 file desc 8 25K 33K 78643K 7550 0 sigio 0 0K 0K 78643K 32 0 proc 56 74K 99K 78643K 1022 0 subproc 26 1K 1K 78643K 182 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 ip_moptions 0 0K 0K 78643K 596 0 in_multi 33 2K 2K 78643K 207 0 ether_multi 1 0K 0K 78643K 16 0 mrt 3 0K 0K 78643K 4 0 ISOFS mount 1 32K 32K 78643K 1 0 MSDOSFS mount 1 16K 16K 78643K 1 0 ttys 283 1261K 1261K 78643K 283 0 exec 0 0K 2K 78643K 1468 0 tdb 3 0K 0K 78643K 3 0 pagedep 1 8K 8K 78643K 1 0 inodedep 1 32K 32K 78643K 1 0 newblk 1 0K 0K 78643K 1 0 VM swap 7 26K 26K 78643K 7 0 UVM amap 274 38K 49K 78643K 100104 0 UVM aobj 131 4K 4K 78643K 131 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 0K 78643K 132 0 NDP 5 0K 0K 78643K 45 0 temp 76 4195K 4307K 78643K 19690 0 kqueue 12 18K 28K 78643K 501 0 SYN cache 2 16K 16K 78643K 2 0 ddb{0}> show all pools Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle plcache 128 22 0 0 1 0 1 1 0 8 0 rtpcb 120 626 0 623 9 8 1 5 0 8 0 rtentry 112 193 0 145 2 0 2 2 0 8 0 unpcb 128 4202 0 4187 35 34 1 5 0 8 0 syncache 296 67 0 67 16 16 0 1 0 8 0 tcpqe 32 19 0 19 7 7 0 1 0 8 0 tcpcb 736 2683 0 2679 99 96 3 13 0 8 2 arp 120 31 0 25 1 0 1 1 0 8 0 ipq 40 12 0 11 3 2 1 1 0 8 0 ipqe 40 67 0 62 3 2 1 1 0 8 0 inpcb 304 5312 0 5305 93 91 2 11 0 8 1 ip6q 72 12 0 12 5 5 0 1 0 8 0 ip6af 40 22 0 22 5 5 0 1 0 8 0 nd6 48 57 0 47 1 0 1 1 0 8 0 kcovpl 48 14 0 12 1 0 1 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 841 0 608 21 6 15 17 0 8 0 art_table 32 842 0 608 3 1 2 3 0 8 0 art_node 16 192 0 148 1 0 1 1 0 8 0 sysvmsgpl 40 6 0 6 1 1 0 1 0 8 0 semupl 112 5 0 5 1 1 0 1 0 8 0 semapl 112 2528 0 2518 1 0 1 1 0 8 0 shmpl 112 128 0 0 4 0 4 4 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 11657 0 10239 90 1 89 89 0 8 0 ffsino 272 11657 0 10239 95 0 95 95 0 8 0 nchpl 144 21515 0 19913 60 0 60 60 0 8 0 uvmvnodes 80 5926 0 0 121 0 121 121 0 8 0 vnodes 224 5926 0 0 349 0 349 349 0 8 0 namei 1024 75728 0 75728 2 1 1 1 0 8 1 percpumem 16 46 0 12 1 0 1 1 0 8 0 scxspl 216 65086 0 65086 27 26 1 8 0 8 1 plimitpl 152 1426 0 1414 1 0 1 1 0 8 0 sigapl 424 7736 0 7702 4 0 4 4 0 8 0 futexpl 64 58164 0 58161 4 3 1 1 0 8 0 knotepl 112 189 0 0 4 1 3 4 0 8 0 kqueuepl 216 3556 0 3548 73 72 1 10 0 8 0 pipepl 336 1980 0 1969 82 75 7 11 0 8 6 fdescpl 496 7721 0 7702 3 0 3 3 0 8 0 filepl 152 54340 0 54221 124 112 12 14 0 8 7 lockfpl 104 9830 0 9825 8 7 1 2 0 8 0 lockfspl 48 1643 0 1639 1 0 1 1 0 8 0 sessionpl 144 29 0 19 1 0 1 1 0 8 0 pgrppl 48 82 0 72 1 0 1 1 0 8 0 ucredpl 96 10369 0 10357 1 0 1 1 0 8 0 zombiepl 144 7702 0 7702 1 0 1 1 0 8 1 processpl 1064 7736 0 7702 3 0 3 3 0 8 0 procpl 672 23633 0 23584 15 10 5 6 0 8 0 sosppl 168 91 0 91 12 12 0 1 0 8 0 sockpl 480 10446 0 10421 234 229 5 29 0 8 1 mcl64k 65536 17 0 0 3 0 3 3 0 8 0 mcl16k 16384 25 0 0 4 1 3 3 0 8 0 mcl12k 12288 25 0 0 2 0 2 2 0 8 0 mcl9k 9216 26 0 0 2 1 1 2 0 8 0 mcl8k 8192 22 0 0 3 0 3 3 0 8 0 mcl4k 4096 39 0 0 4 2 2 3 0 8 0 mcl2k2 2112 9 0 0 1 0 1 1 0 8 0 mcl2k 2048 279 0 0 22 2 20 22 0 8 0 mtagpl 96 1 0 0 1 0 1 1 0 8 0 mbufpl 256 697 0 0 28 1 27 28 0 8 0 bufpl 288 16195 0 9873 452 0 452 452 0 8 0 anonpl 24 2243942 0 2231422 259 178 81 106 0 186 0 amapchunkpl 152 244565 0 243924 71 46 25 38 0 158 0 amappl16 200 20844 0 20497 124 104 20 32 0 8 1 amappl15 192 194 0 187 1 0 1 1 0 8 0 amappl14 184 102 0 100 2 1 1 1 0 8 0 amappl13 176 2063 0 2059 1 0 1 1 0 8 0 amappl12 168 570 0 567 1 0 1 1 0 8 0 amappl11 160 1859 0 1846 1 0 1 1 0 8 0 amappl10 152 1273 0 1273 4 4 0 1 0 8 0 amappl9 144 245 0 243 1 0 1 1 0 8 0 amappl8 136 2341 0 2268 3 0 3 3 0 8 0 amappl7 128 1821 0 1809 1 0 1 1 0 8 0 amappl6 120 102 0 92 1 0 1 1 0 8 0 amappl5 112 6505 0 6485 1 0 1 1 0 8 0 amappl4 104 4598 0 4573 1 0 1 1 0 8 0 amappl3 96 1449 0 1428 1 0 1 1 0 8 0 amappl2 88 10645 0 10597 2 0 2 2 0 8 0 amappl1 80 137809 0 137353 12 2 10 12 0 8 0 amappl 88 99353 0 99166 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 128 253 0 253 1 1 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 72 130 0 0 3 0 3 3 0 8 0 uaddrrnd 24 7721 0 7702 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 7721 0 7702 1 0 1 1 0 8 0 vmmpekpl 168 58763 0 58741 2 0 2 2 0 8 0 vmmpepl 168 717436 0 715674 197 119 78 91 0 357 0 vmsppl 368 7720 0 7702 2 0 2 2 0 8 0 rwobjpl 56 181466 0 174269 118 16 102 105 0 8 0 pdppl 4096 15450 0 15404 62 16 46 50 0 8 0 pvpl 32 3844696 0 3828416 430 293 137 203 0 265 0 pmappl 248 7720 0 7702 2 0 2 2 0 8 0 extentpl 40 57 0 38 1 0 1 1 0 8 0 phpool 112 976 0 203 23 0 23 23 0 8 0 ddb{0}> machine ddbcpu 0 Invalid cpu 0 ddb{0}> trace uvm_fault_lower(ffff8000246d45f0,ffff8000246d4628,ffff8000246d4570,0) at uvm_fault_lower+0xbb1 sys/uvm/uvm_fault.c:1325 uvm_fault(fffffd807efff730,20000000,0,2) at uvm_fault+0x24f sys/uvm/uvm_fault.c:640 kpageflttrap(ffff8000246d4780,20000080) at kpageflttrap+0x1fd sys/arch/amd64/amd64/trap.c:264 kerntrap(ffff8000246d4780) at kerntrap+0xef sys/arch/amd64/amd64/trap.c:318 alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b copyout() at copyout+0x53 syscall(ffff8000246d49c0) at syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff8000246d49c0) at syscall+0x489 sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x502459e8490, count: -8 ddb{0}> machine ddbcpu 1 Stopped at x86_ipi_db+0x1a: addq $0x8,%rsp x86_ipi_db(ffff800020d38ff0) at x86_ipi_db+0x1a sys/arch/amd64/amd64/db_interface.c:393 x86_ipi_handler() at x86_ipi_handler+0xb7 sys/arch/amd64/amd64/ipi.c:106 Xresume_lapic_ipi() at Xresume_lapic_ipi+0x23 __mp_lock(ffffffff828b6eb0) at __mp_lock+0x122 __mp_lock_spin sys/kern/kern_lock.c:116 [inline] __mp_lock(ffffffff828b6eb0) at __mp_lock+0x122 sys/kern/kern_lock.c:147 uvm_fault(fffffd807efff730,5025f48b000,0,2) at uvm_fault+0x233 sys/uvm/uvm_fault.c:639 upageflttrap(ffff8000246daf00,5025f48b6b8) at upageflttrap+0x82 sys/arch/amd64/amd64/trap.c:181 usertrap(ffff8000246daf00) at usertrap+0x214 sys/arch/amd64/amd64/trap.c:403 recall_trap() at recall_trap+0x8 end trace frame: 0x0, count: 7 ddb{1}> trace x86_ipi_db(ffff800020d38ff0) at x86_ipi_db+0x1a sys/arch/amd64/amd64/db_interface.c:393 x86_ipi_handler() at x86_ipi_handler+0xb7 sys/arch/amd64/amd64/ipi.c:106 Xresume_lapic_ipi() at Xresume_lapic_ipi+0x23 __mp_lock(ffffffff828b6eb0) at __mp_lock+0x122 __mp_lock_spin sys/kern/kern_lock.c:116 [inline] __mp_lock(ffffffff828b6eb0) at __mp_lock+0x122 sys/kern/kern_lock.c:147 uvm_fault(fffffd807efff730,5025f48b000,0,2) at uvm_fault+0x233 sys/uvm/uvm_fault.c:639 upageflttrap(ffff8000246daf00,5025f48b6b8) at upageflttrap+0x82 sys/arch/amd64/amd64/trap.c:181 usertrap(ffff8000246daf00) at usertrap+0x214 sys/arch/amd64/amd64/trap.c:403 recall_trap() at recall_trap+0x8 end trace frame: 0x0, count: -8