uvm_fault(0xfffffd807efffa10, 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 *157491 31131 32767 0x10 0 0K syz-executor.0 367314 31131 32767 0x10 0x4000000 1 syz-executor.0 uvm_fault_lower(ffff8000246b8bd0,ffff8000246b8c08,ffff8000246b8b50,0) at uvm_fault_lower+0xbb1 sys/uvm/uvm_fault.c:1325 uvm_fault(fffffd807efffa10,20000000,0,2) at uvm_fault+0x24f sys/uvm/uvm_fault.c:640 upageflttrap(ffff8000246b8d40,20000480) at upageflttrap+0x82 sys/arch/amd64/amd64/trap.c:181 usertrap(ffff8000246b8d40) at usertrap+0x214 sys/arch/amd64/amd64/trap.c:403 recall_trap() at recall_trap+0x8 end of kernel end trace frame: 0x7f7ffffccc40, count: 10 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(0xfffffd807efffa10, 0x0, 0, 1) -> e ddb{0}> trace uvm_fault_lower(ffff8000246b8bd0,ffff8000246b8c08,ffff8000246b8b50,0) at uvm_fault_lower+0xbb1 sys/uvm/uvm_fault.c:1325 uvm_fault(fffffd807efffa10,20000000,0,2) at uvm_fault+0x24f sys/uvm/uvm_fault.c:640 upageflttrap(ffff8000246b8d40,20000480) at upageflttrap+0x82 sys/arch/amd64/amd64/trap.c:181 usertrap(ffff8000246b8d40) at usertrap+0x214 sys/arch/amd64/amd64/trap.c:403 recall_trap() at recall_trap+0x8 end of kernel end trace frame: 0x7f7ffffccc40, count: -5 ddb{0}> show registers rdi 0 rsi 0 rbp 0xffff8000246b8ac0 rbx 0 rdx 0 rcx 0x8 rax 0xffff8000fffeefc0 r8 0xffffffff81a8edde witness_assert+0x1fe r9 0x5 r10 0xf273682ba0e89a4d r11 0x40a4fe08fd24b3f5 r12 0xffff8000246b8bd0 r13 0xfffffd806f87c360 r14 0 r15 0xffffffff81b25d00 uvn_flush+0x950 rip 0xffffffff817b9101 uvm_fault_lower+0xbb1 cs 0x8 rflags 0x10246 __ALIGN_SIZE+0xf246 rsp 0xffff8000246b8a30 ss 0 uvm_fault_lower+0xbb1: movq 0(%rbx),%rdi ddb{0}> show proc PROC (syz-executor.0) pid=157491 stat=onproc flags process=10 proc=0 pri=36, usrpri=69, nice=20 forw=0xffffffffffffffff, list=0xffff8000fffefa40,0xffff8000fffef270 process=0xffff8000ffff8858 user=0xffff8000246b3000, vmspace=0xfffffd807efffa10 estcpu=36, cpticks=1, pctcpu=0.0 user=0, sys=1, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND *31131 157491 5685 32767 7 0x10 syz-executor.0 31131 229388 5685 32767 3 0x4000090 fsleep syz-executor.0 31131 367314 5685 32767 7 0x4000010 syz-executor.0 5685 254962 9993 32767 3 0x90 nanoslp syz-executor.0 9993 511551 83109 0 3 0x82 wait syz-executor.0 94068 177664 13282 32767 2 0x490 syz-executor.1 13282 397917 83109 0 3 0x82 wait syz-executor.1 97243 154679 0 0 3 0x14200 bored sosplice 83109 156396 79875 0 3 0x82 thrsleep syz-fuzzer 83109 362803 79875 0 3 0x4000082 nanoslp syz-fuzzer 83109 469615 79875 0 3 0x4000082 thrsleep syz-fuzzer 83109 318422 79875 0 3 0x4000082 kqread syz-fuzzer 83109 350744 79875 0 3 0x4000082 thrsleep syz-fuzzer 83109 154788 79875 0 3 0x4000082 thrsleep syz-fuzzer 83109 469276 79875 0 3 0x4000082 thrsleep syz-fuzzer 83109 341292 79875 0 3 0x4000082 thrsleep syz-fuzzer 79875 103709 54225 0 3 0x10008a sigsusp ksh 54225 285555 47277 0 3 0x9a kqread sshd 36891 129806 1 0 3 0x100083 ttyin getty 47277 344334 1 0 3 0x88 kqread sshd 16396 5655 45855 73 3 0x100090 kqread syslogd 45855 228969 1 0 3 0x100082 netio syslogd 72491 180032 1 0 3 0x100080 kqread resolvd 96376 184029 89910 77 3 0x100092 kqread dhcpleased 71599 360078 89910 77 3 0x100092 kqread dhcpleased 89910 167905 1 0 3 0x80 kqread dhcpleased 11597 195061 0 0 3 0x14200 bored smr 56262 322709 0 0 3 0x14200 pgzero zerothread 14565 294465 0 0 3 0x14200 aiodoned aiodoned 27361 185136 0 0 3 0x14200 syncer update 81690 141489 0 0 3 0x14200 cleaner cleaner 28985 113777 0 0 3 0x14200 reaper reaper 8178 504685 0 0 3 0x14200 pgdaemon pagedaemon 42966 203292 0 0 3 0x14200 bored viomb 98505 495875 0 0 3 0x40014200 acpi0 acpi0 62142 260024 0 0 3 0x40014200 idle1 38018 243123 0 0 3 0x14200 bored softnet 92706 249470 0 0 3 0x14200 bored systqmp 6777 270746 0 0 3 0x14200 bored systq 15669 345085 0 0 2 0x40014200 softclock 80458 43491 0 0 3 0x40014200 idle0 1 119845 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks Process 31131 (syz-executor.0) thread 0xffff8000fffeefc0 (157491) 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 __mp_acquire_count+0x4c sys/kern/kern_lock.c:227 #2 mi_switch+0x3d3 sys/kern/sched_bsd.c:416 #3 sleep_finish+0x1b2 sys/kern/kern_synch.c:433 #4 rw_enter+0x35b sys/kern/kern_rwlock.c:286 #5 uvmfault_relock+0x6f sys/uvm/uvm_fault.c:1801 #6 uvm_fault_lower+0x931 sys/uvm/uvm_fault.c:1288 #7 uvm_fault+0x24f sys/uvm/uvm_fault.c:640 #8 upageflttrap+0x82 sys/arch/amd64/amd64/trap.c:181 #9 usertrap+0x214 sys/arch/amd64/amd64/trap.c:403 #10 recall_trap+0x8 Process 31131 (syz-executor.0) thread 0xffff8000fffee7e0 (367314) exclusive rwlock amaplk r = 0 (0xfffffd807102ed38) #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 (0xfffffd807efffa28) #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 10170 6397K 6416K 78643K 11454 0 pcb 13 12K 14K 78643K 17 0 rtable 110 3K 4K 78643K 4756 0 ifaddr 39 11K 12K 78643K 492 0 sysctl 3 1K 1K 78643K 3 0 counters 44 34K 34K 78643K 172 0 ioctlops 0 0K 2K 78643K 325 0 iov 0 0K 32K 78643K 5479 0 mount 1 1K 1K 78643K 1 0 log 0 0K 0K 78643K 5 0 vnodes 1209 76K 76K 78643K 21251 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 5K 78643K 368 0 VM map 2 1K 1K 78643K 2 0 sem 10 1K 1K 78643K 10 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1697 195K 286K 78643K 12598 0 file desc 7 21K 33K 78643K 43978 0 sigio 0 0K 0K 78643K 299 0 proc 56 74K 99K 78643K 4264 0 subproc 26 1K 1K 78643K 858 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 ip_moptions 0 0K 0K 78643K 29096 0 in_multi 33 2K 2K 78643K 1221 0 ether_multi 1 0K 0K 78643K 176 0 mrt 1 0K 0K 78643K 6 0 ISOFS mount 1 32K 32K 78643K 1 0 MSDOSFS mount 1 16K 16K 78643K 1 0 ttys 337 1500K 1500K 78643K 337 0 exec 0 0K 2K 78643K 9408 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 329 41K 57K 78643K 581952 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 1286 0 NDP 5 0K 0K 78643K 201 0 temp 76 4195K 4307K 78643K 104933 0 kqueue 14 19K 35K 78643K 2848 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 4526 0 4523 68 67 1 5 0 8 0 rtentry 112 826 0 780 2 0 2 2 0 8 0 unpcb 128 27179 0 27166 279 274 5 7 0 8 4 syncache 296 313 0 313 80 79 1 1 0 8 1 sackhl 24 1 0 1 1 1 0 1 0 8 0 tcpqe 32 90 0 90 42 42 0 1 0 8 0 tcpcb 736 15766 0 15762 527 525 2 19 0 8 1 arp 120 144 0 138 1 0 1 1 0 8 0 ipq 40 54 0 54 28 28 0 1 0 8 0 ipqe 40 525 0 525 28 28 0 1 0 8 0 inpcb 304 43549 0 43542 595 589 6 12 0 8 5 rttmr 72 58 0 57 7 6 1 1 0 8 0 ip6q 72 188 0 188 24 23 1 1 0 8 1 ip6af 40 357 0 357 24 23 1 1 0 8 1 nd6 48 258 0 251 1 0 1 1 0 8 0 kcovpl 48 66 0 64 1 0 1 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 3741 0 3524 52 37 15 20 0 8 0 art_table 32 3742 0 3524 7 5 2 3 0 8 0 art_node 16 825 0 783 1 0 1 1 0 8 0 sysvmsgpl 40 5 0 5 2 2 0 1 0 8 0 semupl 112 5 0 5 1 1 0 1 0 8 0 semapl 112 8 0 0 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 70119 0 68662 99 7 92 92 0 8 0 ffsino 272 70119 0 68662 98 0 98 98 0 8 0 nchpl 144 128655 0 127050 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 494820 0 494820 17 16 1 1 0 8 1 percpumem 16 98 0 64 1 0 1 1 0 8 0 scxspl 216 359787 0 359787 128 127 1 8 0 8 1 plimitpl 152 10243 0 10233 1 0 1 1 0 8 0 sigapl 424 44008 0 43975 4 0 4 4 0 8 0 futexpl 64 322370 0 322369 21 20 1 1 0 8 0 knotepl 112 631 0 0 4 0 4 4 0 8 0 kqueuepl 216 16741 0 16715 313 307 6 8 0 8 4 pipepl 336 10418 0 10408 297 290 7 11 0 8 6 fdescpl 496 43993 0 43975 3 0 3 3 0 8 0 filepl 152 365232 0 365130 541 529 12 14 0 8 8 lockfpl 104 6375 0 6372 3 2 1 2 0 8 0 lockfspl 48 1597 0 1594 1 0 1 1 0 8 0 sessionpl 144 81 0 71 1 0 1 1 0 8 0 pgrppl 48 547 0 537 1 0 1 1 0 8 0 ucredpl 96 121402 0 121390 1 0 1 1 0 8 0 zombiepl 144 43975 0 43974 1 0 1 1 0 8 0 processpl 1064 44008 0 43974 3 0 3 3 0 8 0 procpl 672 140743 0 140700 71 66 5 6 0 8 1 sosppl 168 605 0 605 95 94 1 1 0 8 1 sockpl 480 76913 0 76890 1552 1541 11 34 0 8 8 mcl64k 65536 73 0 0 5 2 3 3 0 8 0 mcl16k 16384 65 0 0 7 4 3 3 0 8 0 mcl12k 12288 89 0 0 2 0 2 2 0 8 0 mcl9k 9216 57 0 0 4 2 2 2 0 8 0 mcl8k 8192 41 0 0 4 1 3 3 0 8 0 mcl4k 4096 89 0 0 5 2 3 3 0 8 0 mcl2k2 2112 25 0 0 2 0 2 2 0 8 0 mcl2k 2048 668 0 0 26 13 13 20 0 8 0 mtagpl 96 2 0 0 1 0 1 1 0 8 0 mbufpl 256 9528 0 0 548 5 543 543 0 8 0 bufpl 288 81868 0 75543 455 3 452 453 0 8 0 anonpl 24 13211407 0 13198962 851 764 87 126 0 186 0 amapchunkpl 152 1474444 0 1473870 436 409 27 38 0 158 4 amappl16 200 131738 0 131390 624 605 19 44 0 8 0 amappl15 192 12659 0 12653 1 0 1 1 0 8 0 amappl14 184 2377 0 2376 5 4 1 1 0 8 0 amappl13 176 4713 0 4712 1 0 1 1 0 8 0 amappl12 168 7462 0 7454 1 0 1 1 0 8 0 amappl11 160 3585 0 3569 1 0 1 1 0 8 0 amappl10 152 4071 0 4067 1 0 1 1 0 8 0 amappl9 144 7902 0 7899 1 0 1 1 0 8 0 amappl8 136 5172 0 5021 6 0 6 6 0 8 0 amappl7 128 3458 0 3448 1 0 1 1 0 8 0 amappl6 120 7986 0 7972 1 0 1 1 0 8 0 amappl5 112 39826 0 39810 1 0 1 1 0 8 0 amappl4 104 8189 0 8155 1 0 1 1 0 8 0 amappl3 96 12568 0 12550 1 0 1 1 0 8 0 amappl2 88 56196 0 56153 5 3 2 2 0 8 0 amappl1 80 771939 0 771511 12 2 10 12 0 8 0 amappl 88 579067 0 578896 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 43993 0 43975 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 43993 0 43975 1 0 1 1 0 8 0 vmmpekpl 168 340646 0 340625 2 0 2 2 0 8 0 vmmpepl 168 4084607 0 4082855 648 559 89 101 0 357 0 vmsppl 368 43992 0 43975 2 0 2 2 0 8 0 rwobjpl 56 1023635 0 1016399 195 91 104 108 0 8 0 pdppl 4096 87994 0 87950 79 33 46 50 0 8 2 pvpl 32 21770089 0 21754021 1498 1354 144 209 0 265 2 pmappl 248 43992 0 43975 2 0 2 2 0 8 0 extentpl 40 57 0 38 1 0 1 1 0 8 0 phpool 112 2228 0 940 39 1 38 38 0 8 0 ddb{0}> machine ddbcpu 0 Invalid cpu 0 ddb{0}> trace uvm_fault_lower(ffff8000246b8bd0,ffff8000246b8c08,ffff8000246b8b50,0) at uvm_fault_lower+0xbb1 sys/uvm/uvm_fault.c:1325 uvm_fault(fffffd807efffa10,20000000,0,2) at uvm_fault+0x24f sys/uvm/uvm_fault.c:640 upageflttrap(ffff8000246b8d40,20000480) at upageflttrap+0x82 sys/arch/amd64/amd64/trap.c:181 usertrap(ffff8000246b8d40) at usertrap+0x214 sys/arch/amd64/amd64/trap.c:403 recall_trap() at recall_trap+0x8 end of kernel end trace frame: 0x7f7ffffccc40, count: -5 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+0x129 __mp_lock_spin sys/kern/kern_lock.c:116 [inline] __mp_lock(ffffffff828b6eb0) at __mp_lock+0x129 sys/kern/kern_lock.c:147 uvm_fault(fffffd807efffa10,9e16a279000,0,2) at uvm_fault+0x233 sys/uvm/uvm_fault.c:639 upageflttrap(ffff800024680550,9e16a279488) at upageflttrap+0x82 sys/arch/amd64/amd64/trap.c:181 usertrap(ffff800024680550) 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+0x129 __mp_lock_spin sys/kern/kern_lock.c:116 [inline] __mp_lock(ffffffff828b6eb0) at __mp_lock+0x129 sys/kern/kern_lock.c:147 uvm_fault(fffffd807efffa10,9e16a279000,0,2) at uvm_fault+0x233 sys/uvm/uvm_fault.c:639 upageflttrap(ffff800024680550,9e16a279488) at upageflttrap+0x82 sys/arch/amd64/amd64/trap.c:181 usertrap(ffff800024680550) at usertrap+0x214 sys/arch/amd64/amd64/trap.c:403 recall_trap() at recall_trap+0x8 end trace frame: 0x0, count: -8