uvm_fault(0xfffffd807efff8a0, 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 * 97068 60607 32767 0x10 0 1K syz-executor.0 30984 60607 32767 0x10 0x4000000 0 syz-executor.0 uvm_fault_lower(ffff800024684cc0,ffff800024684cf8,ffff800024684c40,0) at uvm_fault_lower+0xbb1 sys/uvm/uvm_fault.c:1325 uvm_fault(fffffd807efff8a0,20000000,0,2) at uvm_fault+0x24f sys/uvm/uvm_fault.c:640 upageflttrap(ffff800024684e30,200000c0) at upageflttrap+0x82 sys/arch/amd64/amd64/trap.c:181 usertrap(ffff800024684e30) at usertrap+0x214 sys/arch/amd64/amd64/trap.c:403 recall_trap() at recall_trap+0x8 end of kernel end trace frame: 0x7f7ffffc2030, 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{1}> ddb{1}> set $lines = 0 ddb{1}> set $maxwidth = 0 ddb{1}> show panic *cpu1: uvm_fault(0xfffffd807efff8a0, 0x0, 0, 1) -> e ddb{1}> trace uvm_fault_lower(ffff800024684cc0,ffff800024684cf8,ffff800024684c40,0) at uvm_fault_lower+0xbb1 sys/uvm/uvm_fault.c:1325 uvm_fault(fffffd807efff8a0,20000000,0,2) at uvm_fault+0x24f sys/uvm/uvm_fault.c:640 upageflttrap(ffff800024684e30,200000c0) at upageflttrap+0x82 sys/arch/amd64/amd64/trap.c:181 usertrap(ffff800024684e30) at usertrap+0x214 sys/arch/amd64/amd64/trap.c:403 recall_trap() at recall_trap+0x8 end of kernel end trace frame: 0x7f7ffffc2030, count: -5 ddb{1}> show registers rdi 0 rsi 0 rbp 0xffff800024684bb0 rbx 0 rdx 0 rcx 0x8 rax 0xffff8000fffed268 r8 0xffffffff81a8edde witness_assert+0x1fe r9 0x5 r10 0x89a6592de12a74d1 r11 0x544c801662f12652 r12 0xffff800024684cc0 r13 0xfffffd807eb021e0 r14 0 r15 0xffffffff81b25d00 uvn_flush+0x950 rip 0xffffffff817b9101 uvm_fault_lower+0xbb1 cs 0x8 rflags 0x10246 __ALIGN_SIZE+0xf246 rsp 0xffff800024684b20 ss 0 uvm_fault_lower+0xbb1: movq 0(%rbx),%rdi ddb{1}> show proc PROC (syz-executor.0) pid=97068 stat=onproc flags process=10 proc=0 pri=36, usrpri=79, nice=20 forw=0xffffffffffffffff, list=0xffff8000fffeda48,0xffff8000fffec558 process=0xffff8000ffffa998 user=0xffff80002467f000, vmspace=0xfffffd807efff8a0 estcpu=29, cpticks=2, pctcpu=0.0 user=0, sys=1, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND *60607 97068 36154 32767 7 0x10 syz-executor.0 60607 16449 36154 32767 3 0x4000090 fsleep syz-executor.0 60607 178042 36154 32767 3 0x4000090 fsleep syz-executor.0 60607 30984 36154 32767 7 0x4000010 syz-executor.0 91394 17839 44537 0 3 0x82 wait syz-executor.1 36154 480095 56573 32767 3 0x90 nanoslp syz-executor.0 56573 141335 44537 0 3 0x82 wait syz-executor.0 597 218252 0 0 3 0x14200 bored sosplice 44537 461654 55160 0 3 0x82 thrsleep syz-fuzzer 44537 418138 55160 0 3 0x4000082 nanoslp syz-fuzzer 44537 350242 55160 0 3 0x4000082 thrsleep syz-fuzzer 44537 77591 55160 0 3 0x4000082 kqread syz-fuzzer 44537 387855 55160 0 3 0x4000082 thrsleep syz-fuzzer 44537 365524 55160 0 3 0x4000082 thrsleep syz-fuzzer 44537 170257 55160 0 3 0x4000082 thrsleep syz-fuzzer 44537 211767 55160 0 3 0x4000082 nanoslp syz-fuzzer 55160 481022 47792 0 3 0x10008a sigsusp ksh 47792 21302 92094 0 3 0x9a kqread sshd 16387 185136 1 0 3 0x100083 ttyin getty 92094 174682 1 0 3 0x88 kqread sshd 49364 464387 71907 73 3 0x100090 kqread syslogd 71907 238623 1 0 3 0x100082 netio syslogd 70610 24498 1 0 3 0x100080 kqread resolvd 62255 226831 78140 77 3 0x100092 kqread dhcpleased 20513 317000 78140 77 3 0x100092 kqread dhcpleased 78140 341430 1 0 3 0x80 kqread dhcpleased 1037 315991 0 0 3 0x14200 bored smr 30845 122701 0 0 3 0x14200 pgzero zerothread 51999 268690 0 0 3 0x14200 aiodoned aiodoned 66144 6314 0 0 3 0x14200 syncer update 47918 489648 0 0 3 0x14200 cleaner cleaner 28760 150214 0 0 3 0x14200 reaper reaper 61737 206929 0 0 3 0x14200 pgdaemon pagedaemon 57352 374131 0 0 3 0x14200 bored viomb 33913 277207 0 0 3 0x40014200 acpi0 acpi0 29432 309830 0 0 3 0x40014200 idle1 6577 516222 0 0 3 0x14200 bored softnet 70835 477082 0 0 3 0x14200 bored systqmp 51221 266803 0 0 3 0x14200 bored systq 21112 154898 0 0 3 0x40014200 bored softclock 67092 280290 0 0 3 0x40014200 idle0 1 329999 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks Process 60607 (syz-executor.0) thread 0xffff8000fffed268 (97068) 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 60607 (syz-executor.0) thread 0xffff8000fffedce8 (30984) exclusive rwlock amaplk r = 0 (0xfffffd8065e2df28) #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 (0xfffffd807efff8b8) #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{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10123 6390K 6416K 78643K 11222 0 pcb 13 10K 12K 78643K 15 0 rtable 106 3K 3K 78643K 298 0 ifaddr 39 10K 10K 78643K 61 0 counters 44 34K 34K 78643K 50 0 ioctlops 0 0K 2K 78643K 34 0 iov 0 0K 16K 78643K 276 0 mount 1 1K 1K 78643K 1 0 log 0 0K 0K 78643K 5 0 vnodes 1208 76K 76K 78643K 1731 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 5K 78643K 20 0 VM map 2 1K 1K 78643K 2 0 sem 12 0K 0K 78643K 585 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1697 195K 286K 78643K 12598 0 file desc 7 21K 33K 78643K 1826 0 sigio 0 0K 0K 78643K 9 0 proc 56 74K 99K 78643K 444 0 subproc 26 1K 1K 78643K 65 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 ip_moptions 0 0K 0K 78643K 387 0 in_multi 33 2K 2K 78643K 93 0 ether_multi 1 0K 0K 78643K 13 0 mrt 1 0K 0K 78643K 1 0 ISOFS mount 1 32K 32K 78643K 1 0 MSDOSFS mount 1 16K 16K 78643K 1 0 ttys 55 254K 254K 78643K 55 0 exec 0 0K 2K 78643K 958 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 210 28K 35K 78643K 25769 0 UVM aobj 27 5K 5K 78643K 27 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 0K 78643K 42 0 NDP 7 0K 0K 78643K 18 0 temp 76 4195K 4307K 78643K 6378 0 kqueue 12 18K 28K 78643K 109 0 SYN cache 2 16K 16K 78643K 2 0 ddb{1}> 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 84 0 81 1 0 1 1 0 8 0 rtentry 112 82 0 38 2 0 2 2 0 8 0 unpcb 128 1231 0 1218 10 9 1 5 0 8 0 syncache 296 19 0 19 4 4 0 1 0 8 0 tcpqe 32 408 0 408 2 2 0 2 0 8 0 tcpcb 736 788 0 784 31 30 1 11 0 8 0 arp 120 13 0 7 1 0 1 1 0 8 0 ipq 40 2 0 2 1 1 0 1 0 8 0 ipqe 40 9 0 9 1 1 0 1 0 8 0 inpcb 304 1552 0 1545 28 27 1 11 0 8 0 ip6q 72 2 0 2 1 1 0 1 0 8 0 ip6af 40 3 0 3 1 1 0 1 0 8 0 nd6 48 18 0 12 1 0 1 1 0 8 0 kcovpl 48 5 0 3 1 0 1 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 363 0 174 15 0 15 15 0 8 2 art_table 32 364 0 174 2 0 2 2 0 8 0 art_node 16 81 0 41 1 0 1 1 0 8 0 sysvmsgpl 40 4 0 2 1 0 1 1 0 8 0 semupl 112 2 0 2 1 1 0 1 0 8 0 semapl 112 581 0 571 1 0 1 1 0 8 0 shmpl 112 24 0 0 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 4225 0 2819 91 2 89 89 0 8 0 ffsino 272 4225 0 2819 96 2 94 95 0 8 0 nchpl 144 7337 0 5733 60 0 60 60 0 8 0 uvmvnodes 80 4299 0 0 88 0 88 88 0 8 0 vnodes 224 4299 0 0 253 0 253 253 0 8 0 namei 1024 22754 0 22754 4 3 1 1 0 8 1 percpumem 16 37 0 3 1 0 1 1 0 8 0 scxspl 216 28153 0 28153 11 10 1 8 0 8 1 plimitpl 152 239 0 229 1 0 1 1 0 8 0 sigapl 424 2039 0 2006 4 0 4 4 0 8 0 futexpl 64 15731 0 15729 5 4 1 1 0 8 0 knotepl 112 85 0 0 3 1 2 3 0 8 0 kqueuepl 216 518 0 510 9 8 1 5 0 8 0 pipepl 336 340 0 330 13 12 1 7 0 8 0 fdescpl 496 2024 0 2006 3 0 3 3 0 8 0 filepl 152 13791 0 13689 23 18 5 10 0 8 1 lockfpl 104 680 0 677 1 0 1 1 0 8 0 lockfspl 48 328 0 325 1 0 1 1 0 8 0 sessionpl 144 20 0 10 1 0 1 1 0 8 0 pgrppl 48 63 0 53 1 0 1 1 0 8 0 ucredpl 96 2647 0 2635 1 0 1 1 0 8 0 zombiepl 144 2007 0 2006 1 0 1 1 0 8 0 processpl 1064 2039 0 2006 3 0 3 3 0 8 0 procpl 672 6047 0 6004 6 1 5 6 0 8 1 sosppl 168 24 0 24 3 3 0 1 0 8 0 sockpl 480 2944 0 2921 54 50 4 20 0 8 1 mcl64k 65536 17 0 0 3 0 3 3 0 8 0 mcl16k 16384 9 0 0 2 0 2 2 0 8 0 mcl12k 12288 18 0 0 2 0 2 2 0 8 0 mcl9k 9216 18 0 0 2 0 2 2 0 8 0 mcl8k 8192 14 0 0 2 0 2 2 0 8 0 mcl4k 4096 25 0 0 3 0 3 3 0 8 0 mcl2k2 2112 2 0 0 1 0 1 1 0 8 0 mcl2k 2048 282 0 0 34 0 34 34 0 8 0 mtagpl 96 3 0 0 1 0 1 1 0 8 0 mbufpl 256 379 0 0 21 0 21 21 0 8 0 bufpl 288 10982 0 4657 452 0 452 452 0 8 0 anonpl 24 608968 0 598969 162 59 103 103 0 186 26 amapchunkpl 152 63131 0 62585 52 18 34 34 0 158 10 amappl16 200 6461 0 6120 52 33 19 31 0 8 1 amappl15 192 77 0 70 1 0 1 1 0 8 0 amappl14 184 6 0 4 3 2 1 1 0 8 0 amappl13 176 691 0 689 1 0 1 1 0 8 0 amappl12 168 17 0 12 1 0 1 1 0 8 0 amappl11 160 75 0 62 1 0 1 1 0 8 0 amappl10 152 26 0 25 1 0 1 1 0 8 0 amappl9 144 1128 0 1126 1 0 1 1 0 8 0 amappl8 136 612 0 577 2 0 2 2 0 8 0 amappl7 128 292 0 281 1 0 1 1 0 8 0 amappl6 120 938 0 930 1 0 1 1 0 8 0 amappl5 112 2036 0 2017 1 0 1 1 0 8 0 amappl4 104 621 0 596 1 0 1 1 0 8 0 amappl3 96 331 0 314 1 0 1 1 0 8 0 amappl2 88 2860 0 2814 2 0 2 2 0 8 0 amappl1 80 38207 0 37766 12 2 10 12 0 8 0 amappl 88 25153 0 24997 4 0 4 4 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 26 0 0 1 0 1 1 0 8 0 uaddrrnd 24 2024 0 2006 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 2024 0 2006 1 0 1 1 0 8 0 vmmpekpl 168 20228 0 20203 2 0 2 2 0 8 0 vmmpepl 168 192139 0 190527 123 36 87 87 0 357 15 vmsppl 368 2023 0 2006 2 0 2 2 0 8 0 rwobjpl 56 53530 0 48135 80 3 77 77 0 8 1 pdppl 4096 4056 0 4012 68 22 46 50 0 8 2 pvpl 32 1086684 0 1073188 288 95 193 199 0 265 61 pmappl 248 2023 0 2006 2 0 2 2 0 8 0 extentpl 40 57 0 38 1 0 1 1 0 8 0 phpool 112 844 0 73 23 0 23 23 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x1a: addq $0x8,%rsp x86_ipi_db(ffffffff827adff0) 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 softintr_dispatch(0) at softintr_dispatch+0x4e sys/arch/amd64/amd64/softintr.c:90 Xsoftclock() at Xsoftclock+0x1f __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0xb sys/dev/kcov.c:139 uvm_fault(fffffd807efff8a0,a3d2b833000,0,2) at uvm_fault+0x233 sys/uvm/uvm_fault.c:639 upageflttrap(ffff8000246b49a0,a3d2b833638) at upageflttrap+0x82 sys/arch/amd64/amd64/trap.c:181 usertrap(ffff8000246b49a0) at usertrap+0x214 sys/arch/amd64/amd64/trap.c:403 recall_trap() at recall_trap+0x8 end trace frame: 0x0, count: 4 ddb{0}> trace x86_ipi_db(ffffffff827adff0) 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 softintr_dispatch(0) at softintr_dispatch+0x4e sys/arch/amd64/amd64/softintr.c:90 Xsoftclock() at Xsoftclock+0x1f __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0xb sys/dev/kcov.c:139 uvm_fault(fffffd807efff8a0,a3d2b833000,0,2) at uvm_fault+0x233 sys/uvm/uvm_fault.c:639 upageflttrap(ffff8000246b49a0,a3d2b833638) at upageflttrap+0x82 sys/arch/amd64/amd64/trap.c:181 usertrap(ffff8000246b49a0) at usertrap+0x214 sys/arch/amd64/amd64/trap.c:403 recall_trap() at recall_trap+0x8 end trace frame: 0x0, count: -11 ddb{0}> machine ddbcpu 1 Stopped at uvm_fault_lower+0xbb1: movq 0(%rbx),%rdi uvm_fault_lower(ffff800024684cc0,ffff800024684cf8,ffff800024684c40,0) at uvm_fault_lower+0xbb1 sys/uvm/uvm_fault.c:1325 uvm_fault(fffffd807efff8a0,20000000,0,2) at uvm_fault+0x24f sys/uvm/uvm_fault.c:640 upageflttrap(ffff800024684e30,200000c0) at upageflttrap+0x82 sys/arch/amd64/amd64/trap.c:181 usertrap(ffff800024684e30) at usertrap+0x214 sys/arch/amd64/amd64/trap.c:403 recall_trap() at recall_trap+0x8 end of kernel end trace frame: 0x7f7ffffc2030, count: 10 ddb{1}> trace uvm_fault_lower(ffff800024684cc0,ffff800024684cf8,ffff800024684c40,0) at uvm_fault_lower+0xbb1 sys/uvm/uvm_fault.c:1325 uvm_fault(fffffd807efff8a0,20000000,0,2) at uvm_fault+0x24f sys/uvm/uvm_fault.c:640 upageflttrap(ffff800024684e30,200000c0) at upageflttrap+0x82 sys/arch/amd64/amd64/trap.c:181 usertrap(ffff800024684e30) at usertrap+0x214 sys/arch/amd64/amd64/trap.c:403 recall_trap() at recall_trap+0x8 end of kernel end trace frame: 0x7f7ffffc2030, count: -5