uvm_fault(0xfffffd807efff5c0, 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 *442717 63614 32767 0x10 0 0K syz-executor.1 20751 63614 32767 0x10 0x4000000 1 syz-executor.1 uvm_fault_lower(ffff8000246a2c70,ffff8000246a2ca8,ffff8000246a2bf0,0) at uvm_fault_lower+0xbb1 sys/uvm/uvm_fault.c:1325 uvm_fault(fffffd807efff5c0,20000000,0,2) at uvm_fault+0x24f sys/uvm/uvm_fault.c:640 upageflttrap(ffff8000246a2de0,20000000) at upageflttrap+0x82 sys/arch/amd64/amd64/trap.c:181 usertrap(ffff8000246a2de0) at usertrap+0x214 sys/arch/amd64/amd64/trap.c:403 recall_trap() at recall_trap+0x8 end of kernel end trace frame: 0x7f7fffff4670, 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(0xfffffd807efff5c0, 0x0, 0, 1) -> e ddb{0}> trace uvm_fault_lower(ffff8000246a2c70,ffff8000246a2ca8,ffff8000246a2bf0,0) at uvm_fault_lower+0xbb1 sys/uvm/uvm_fault.c:1325 uvm_fault(fffffd807efff5c0,20000000,0,2) at uvm_fault+0x24f sys/uvm/uvm_fault.c:640 upageflttrap(ffff8000246a2de0,20000000) at upageflttrap+0x82 sys/arch/amd64/amd64/trap.c:181 usertrap(ffff8000246a2de0) at usertrap+0x214 sys/arch/amd64/amd64/trap.c:403 recall_trap() at recall_trap+0x8 end of kernel end trace frame: 0x7f7fffff4670, count: -5 ddb{0}> show registers rdi 0 rsi 0 rbp 0xffff8000246a2b60 rbx 0 rdx 0 rcx 0 rax 0xffff8000fffeea80 r8 0xffffffff81a8edde witness_assert+0x1fe r9 0x5 r10 0x90327b115b060123 r11 0x9c607233d75906ad r12 0xffff8000246a2c70 r13 0xfffffd806527fd68 r14 0 r15 0x5a8 rip 0xffffffff817b9101 uvm_fault_lower+0xbb1 cs 0x8 rflags 0x10246 __ALIGN_SIZE+0xf246 rsp 0xffff8000246a2ad0 ss 0x10 uvm_fault_lower+0xbb1: movq 0(%rbx),%rdi ddb{0}> show proc PROC (syz-executor.1) pid=442717 stat=onproc flags process=10 proc=0 pri=32, usrpri=86, nice=20 forw=0xffffffffffffffff, list=0xffff8000fffee7e0,0xffff8000fffefcf0 process=0xffff8000ffffb1e8 user=0xffff80002469d000, vmspace=0xfffffd807efff5c0 estcpu=36, cpticks=2, pctcpu=0.0 user=0, sys=1, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND *63614 442717 62884 32767 7 0x10 syz-executor.1 63614 113165 62884 32767 3 0x4000090 fsleep syz-executor.1 63614 20751 62884 32767 7 0x4000010 syz-executor.1 62884 102231 8698 32767 2 0x490 syz-executor.1 8698 294338 96000 0 3 0x82 wait syz-executor.1 20558 290544 23340 32767 2 0x490 syz-executor.0 23340 9672 96000 0 3 0x82 wait syz-executor.0 64117 103906 0 0 3 0x14200 bored sosplice 96000 114183 31730 0 3 0x82 thrsleep syz-fuzzer 96000 360811 31730 0 3 0x4000082 nanoslp syz-fuzzer 96000 389057 31730 0 3 0x4000082 thrsleep syz-fuzzer 96000 457004 31730 0 3 0x4000082 thrsleep syz-fuzzer 96000 233191 31730 0 2 0x4000482 syz-fuzzer 96000 495574 31730 0 3 0x4000082 thrsleep syz-fuzzer 96000 311397 31730 0 3 0x4000082 thrsleep syz-fuzzer 96000 258961 31730 0 3 0x4000082 kqread syz-fuzzer 31730 25913 98459 0 3 0x10008a sigsusp ksh 98459 490485 37710 0 3 0x9a kqread sshd 37486 389878 1 0 3 0x100083 ttyin getty 37710 471212 1 0 3 0x88 kqread sshd 57495 162791 66457 73 3 0x100090 kqread syslogd 66457 441724 1 0 3 0x100082 netio syslogd 599 496095 1 0 3 0x100080 kqread resolvd 4284 8644 88534 77 3 0x100092 kqread dhcpleased 82201 213924 88534 77 3 0x100092 kqread dhcpleased 88534 277627 1 0 3 0x80 kqread dhcpleased 2894 371106 0 0 3 0x14200 bored smr 68944 291411 0 0 3 0x14200 pgzero zerothread 31175 298759 0 0 3 0x14200 aiodoned aiodoned 95052 405400 0 0 3 0x14200 syncer update 5795 802 0 0 3 0x14200 cleaner cleaner 51679 407988 0 0 3 0x14200 reaper reaper 93061 312225 0 0 3 0x14200 pgdaemon pagedaemon 52162 62602 0 0 3 0x14200 bored viomb 6998 284794 0 0 3 0x40014200 acpi0 acpi0 79150 184934 0 0 3 0x40014200 idle1 73624 212865 0 0 3 0x14200 bored softnet 57738 380202 0 0 3 0x14200 bored systqmp 66214 310646 0 0 3 0x14200 bored systq 23166 310266 0 0 2 0x40014200 softclock 3443 392418 0 0 3 0x40014200 idle0 1 506851 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks Process 63614 (syz-executor.1) thread 0xffff8000fffeea80 (442717) 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 uvm_fault_lower+0x95d sys/uvm/uvm_fault.c:1290 #6 uvm_fault+0x24f sys/uvm/uvm_fault.c:640 #7 upageflttrap+0x82 sys/arch/amd64/amd64/trap.c:181 #8 usertrap+0x214 sys/arch/amd64/amd64/trap.c:403 #9 recall_trap+0x8 ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10157 6395K 6416K 78643K 11267 0 pcb 13 12K 14K 78643K 17 0 rtable 106 3K 3K 78643K 683 0 ifaddr 39 10K 10K 78643K 82 0 sysctl 2 0K 0K 78643K 2 0 counters 44 34K 34K 78643K 56 0 ioctlops 0 0K 2K 78643K 60 0 iov 0 0K 24K 78643K 623 0 mount 1 1K 1K 78643K 1 0 log 0 0K 0K 78643K 5 0 vnodes 1209 76K 76K 78643K 2393 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 5K 78643K 46 0 VM map 2 1K 1K 78643K 2 0 sem 12 0K 0K 78643K 1456 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1697 195K 286K 78643K 12598 0 file desc 7 21K 33K 78643K 4152 0 sigio 0 0K 0K 78643K 98 0 proc 56 74K 99K 78643K 612 0 subproc 26 1K 1K 78643K 104 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 ip_moptions 0 0K 0K 78643K 12249 0 in_multi 33 2K 2K 78643K 232 0 ether_multi 1 0K 0K 78643K 35 0 mrt 1 0K 0K 78643K 4 0 ISOFS mount 1 32K 32K 78643K 1 0 MSDOSFS mount 1 16K 16K 78643K 1 0 ttys 259 1155K 1155K 78643K 259 0 exec 0 0K 2K 78643K 921 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 221 31K 44K 78643K 56302 0 UVM aobj 131 4K 4K 78643K 149 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 0K 78643K 123 0 NDP 5 0K 0K 78643K 27 0 temp 76 4195K 4323K 78643K 11564 0 kqueue 13 18K 24K 78643K 250 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 120 183 0 180 1 0 1 1 0 8 0 rtentry 112 120 0 76 2 0 2 2 0 8 0 unpcb 128 3292 0 3279 29 24 5 5 0 8 4 syncache 296 36 0 36 9 8 1 1 0 8 1 tcpqe 32 116 0 116 6 5 1 1 0 8 1 tcpcb 736 4816 0 4761 101 86 15 20 0 8 8 arp 120 20 0 14 1 0 1 1 0 8 0 ipq 40 7 0 5 4 3 1 1 0 8 0 ipqe 40 23 0 21 4 3 1 1 0 8 0 inpcb 304 7406 0 7395 59 50 9 11 0 8 8 ip6q 72 4 0 4 2 2 0 1 0 8 0 ip6af 40 7 0 7 2 2 0 1 0 8 0 nd6 48 31 0 25 1 0 1 1 0 8 0 kcovpl 48 8 0 6 1 0 1 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 478 0 289 14 2 12 14 0 8 0 art_table 32 479 0 289 2 0 2 2 0 8 0 art_node 16 119 0 79 1 0 1 1 0 8 0 sysvmsgpl 40 11 0 8 2 1 1 1 0 8 0 semupl 112 3 0 3 1 1 0 1 0 8 0 semapl 112 1454 0 1444 1 0 1 1 0 8 0 shmpl 112 146 0 18 4 0 4 4 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 7289 0 5878 91 2 89 89 0 8 0 ffsino 272 7289 0 5878 95 0 95 95 0 8 0 nchpl 144 12889 0 11288 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 41922 0 41922 1 0 1 1 0 8 1 percpumem 16 40 0 6 1 0 1 1 0 8 0 scxspl 216 37089 0 37089 28 25 3 8 0 8 3 plimitpl 152 1072 0 1062 1 0 1 1 0 8 0 sigapl 424 4356 0 4323 4 0 4 4 0 8 0 futexpl 64 34527 0 34526 1 0 1 1 0 8 0 knotepl 112 119 0 0 3 0 3 3 0 8 0 kqueuepl 216 1263 0 1254 24 19 5 5 0 8 4 pipepl 336 524 0 514 19 12 7 7 0 8 6 fdescpl 496 4341 0 4323 3 0 3 3 0 8 0 filepl 152 31430 0 31326 53 41 12 14 0 8 7 lockfpl 104 436 0 434 1 0 1 1 0 8 0 lockfspl 48 200 0 198 1 0 1 1 0 8 0 sessionpl 144 23 0 13 1 0 1 1 0 8 0 pgrppl 48 37 0 27 1 0 1 1 0 8 0 ucredpl 96 6433 0 6421 1 0 1 1 0 8 0 zombiepl 144 4323 0 4322 1 0 1 1 0 8 0 processpl 1064 4356 0 4322 3 0 3 3 0 8 0 procpl 672 13432 0 13389 8 3 5 5 0 8 1 sosppl 168 61 0 61 9 8 1 1 0 8 1 sockpl 480 10932 0 10905 206 194 12 28 0 8 8 mcl64k 65536 25 0 0 3 0 3 3 0 8 0 mcl16k 16384 22 0 0 3 1 2 3 0 8 0 mcl12k 12288 31 0 0 2 0 2 2 0 8 0 mcl9k 9216 13 0 0 1 0 1 1 0 8 0 mcl8k 8192 17 0 0 3 0 3 3 0 8 0 mcl4k 4096 18 0 0 3 0 3 3 0 8 0 mcl2k2 2112 8 0 0 1 0 1 1 0 8 0 mcl2k 2048 213 0 0 22 4 18 22 0 8 0 mtagpl 96 1 0 0 1 0 1 1 0 8 0 mbufpl 256 409 0 0 20 1 19 19 0 8 0 bufpl 288 11458 0 5133 452 0 452 452 0 8 0 anonpl 24 1268543 0 1256153 184 104 80 100 0 186 2 amapchunkpl 152 140304 0 139721 77 51 26 37 0 158 2 amappl16 200 11816 0 11492 81 63 18 30 0 8 0 amappl15 192 1622 0 1616 1 0 1 1 0 8 0 amappl14 184 3 0 2 1 0 1 1 0 8 0 amappl13 176 1347 0 1346 1 0 1 1 0 8 0 amappl12 168 444 0 441 2 1 1 1 0 8 0 amappl11 160 350 0 335 1 0 1 1 0 8 0 amappl10 152 14 0 13 1 0 1 1 0 8 0 amappl9 144 766 0 762 1 0 1 1 0 8 0 amappl8 136 469 0 422 2 0 2 2 0 8 0 amappl7 128 89 0 80 1 0 1 1 0 8 0 amappl6 120 603 0 593 1 0 1 1 0 8 0 amappl5 112 3907 0 3889 1 0 1 1 0 8 0 amappl4 104 1249 0 1220 1 0 1 1 0 8 0 amappl3 96 928 0 910 1 0 1 1 0 8 0 amappl2 88 6115 0 6072 4 3 1 2 0 8 0 amappl1 80 78659 0 78225 12 2 10 12 0 8 0 amappl 88 55756 0 55591 9 4 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 72 148 0 18 3 0 3 3 0 8 0 uaddrrnd 24 4341 0 4323 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 4341 0 4323 1 0 1 1 0 8 0 vmmpekpl 168 37898 0 37876 2 0 2 2 0 8 0 vmmpepl 168 402359 0 400749 134 59 75 90 0 357 1 vmsppl 368 4340 0 4323 2 0 2 2 0 8 0 rwobjpl 56 106883 0 99771 103 2 101 103 0 8 0 pdppl 4096 8690 0 8646 66 20 46 50 0 8 2 pvpl 32 2094741 0 2078820 289 149 140 168 0 265 6 pmappl 248 4340 0 4323 2 0 2 2 0 8 0 extentpl 40 57 0 38 1 0 1 1 0 8 0 phpool 112 902 0 130 23 0 23 23 0 8 0 ddb{0}> machine ddbcpu 0 Invalid cpu 0 ddb{0}> trace uvm_fault_lower(ffff8000246a2c70,ffff8000246a2ca8,ffff8000246a2bf0,0) at uvm_fault_lower+0xbb1 sys/uvm/uvm_fault.c:1325 uvm_fault(fffffd807efff5c0,20000000,0,2) at uvm_fault+0x24f sys/uvm/uvm_fault.c:640 upageflttrap(ffff8000246a2de0,20000000) at upageflttrap+0x82 sys/arch/amd64/amd64/trap.c:181 usertrap(ffff8000246a2de0) at usertrap+0x214 sys/arch/amd64/amd64/trap.c:403 recall_trap() at recall_trap+0x8 end of kernel end trace frame: 0x7f7fffff4670, 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+0x122 __mp_lock_spin sys/kern/kern_lock.c:116 [inline] __mp_lock(ffffffff828b6eb0) at __mp_lock+0x122 sys/kern/kern_lock.c:147 syscall(ffff8000246adf90) at syscall+0x3ef mi_syscall sys/sys/syscall_mi.h:93 [inline] syscall(ffff8000246adf90) at syscall+0x3ef sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xf660985dbe0, count: 9 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 syscall(ffff8000246adf90) at syscall+0x3ef mi_syscall sys/sys/syscall_mi.h:93 [inline] syscall(ffff8000246adf90) at syscall+0x3ef sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xf660985dbe0, count: -6