uvm_fault(0xfffffd806ef47e68, 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 *219428 30014 32767 0x10 0 1K syz-executor.0 62455 30014 32767 0x10 0x4000000 0 syz-executor.0 uvm_fault_lower(ffff8000246a3f60,ffff8000246a3f98,ffff8000246a3ee0,0) at uvm_fault_lower+0xbb1 sys/uvm/uvm_fault.c:1325 uvm_fault(fffffd806ef47e68,20000000,0,2) at uvm_fault+0x24f sys/uvm/uvm_fault.c:640 upageflttrap(ffff8000246a40d0,20000000) at upageflttrap+0x82 sys/arch/amd64/amd64/trap.c:181 usertrap(ffff8000246a40d0) at usertrap+0x214 sys/arch/amd64/amd64/trap.c:403 recall_trap() at recall_trap+0x8 end of kernel end trace frame: 0x7f7ffffd1b90, 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(0xfffffd806ef47e68, 0x0, 0, 1) -> e ddb{1}> trace uvm_fault_lower(ffff8000246a3f60,ffff8000246a3f98,ffff8000246a3ee0,0) at uvm_fault_lower+0xbb1 sys/uvm/uvm_fault.c:1325 uvm_fault(fffffd806ef47e68,20000000,0,2) at uvm_fault+0x24f sys/uvm/uvm_fault.c:640 upageflttrap(ffff8000246a40d0,20000000) at upageflttrap+0x82 sys/arch/amd64/amd64/trap.c:181 usertrap(ffff8000246a40d0) at usertrap+0x214 sys/arch/amd64/amd64/trap.c:403 recall_trap() at recall_trap+0x8 end of kernel end trace frame: 0x7f7ffffd1b90, count: -5 ddb{1}> show registers rdi 0 rsi 0 rbp 0xffff8000246a3e50 rbx 0 rdx 0 rcx 0 rax 0xffff8000fffee540 r8 0xffffffff821e656e witness_assert+0x1fe r9 0x5 r10 0x4dcc940df8027664 r11 0x9762b83e1b793874 r12 0xffff8000246a3f60 r13 0xfffffd8066899850 r14 0 r15 0xffffffff81d65300 uvn_flush+0x990 rip 0xffffffff81a60511 uvm_fault_lower+0xbb1 cs 0x8 rflags 0x10246 __ALIGN_SIZE+0xf246 rsp 0xffff8000246a3dc0 ss 0 uvm_fault_lower+0xbb1: movq 0(%rbx),%rdi ddb{1}> show proc PROC (syz-executor.0) pid=219428 stat=onproc flags process=10 proc=0 pri=36, usrpri=59, nice=20 forw=0xffffffffffffffff, list=0xffff8000fffee000,0xffff8000fffef270 process=0xffff8000ffff94d0 user=0xffff80002469f000, vmspace=0xfffffd806ef47e68 estcpu=9, cpticks=2, pctcpu=0.0 user=0, sys=1, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND *30014 219428 82669 32767 7 0x10 syz-executor.0 30014 148989 82669 32767 3 0x4000090 fsleep syz-executor.0 30014 62455 82669 32767 7 0x4000010 syz-executor.0 82669 93300 88202 32767 3 0x90 nanoslp syz-executor.0 88202 208813 30382 0 3 0x82 wait syz-executor.0 69391 282682 3156 32767 3 0x90 nanoslp syz-executor.1 3156 253269 30382 0 3 0x82 wait syz-executor.1 30429 276064 0 0 3 0x14200 bored sosplice 30382 164205 91524 0 3 0x82 thrsleep syz-fuzzer 30382 364416 91524 0 3 0x4000082 nanoslp syz-fuzzer 30382 273565 91524 0 3 0x4000082 thrsleep syz-fuzzer 30382 236582 91524 0 3 0x4000082 kqread syz-fuzzer 30382 484628 91524 0 3 0x4000082 thrsleep syz-fuzzer 30382 415489 91524 0 3 0x4000082 thrsleep syz-fuzzer 30382 177000 91524 0 3 0x4000082 nanoslp syz-fuzzer 30382 17009 91524 0 3 0x4000082 thrsleep syz-fuzzer 91524 181086 34510 0 3 0x10008a sigsusp ksh 34510 68067 58129 0 3 0x9a kqread sshd 47891 358475 1 0 3 0x100083 ttyin getty 58129 240978 1 0 3 0x88 kqread sshd 57606 214250 31086 73 3 0x100090 kqread syslogd 31086 67097 1 0 3 0x100082 netio syslogd 1346 91193 1 0 3 0x100080 kqread resolvd 83846 12117 40682 77 3 0x100092 kqread dhcpleased 62131 78963 40682 77 3 0x100092 kqread dhcpleased 40682 175656 1 0 3 0x80 kqread dhcpleased 73481 32344 0 0 3 0x14200 bored smr 18308 315820 0 0 2 0x14200 zerothread 69659 418634 0 0 3 0x14200 aiodoned aiodoned 91352 52196 0 0 3 0x14200 syncer update 67646 419620 0 0 3 0x14200 cleaner cleaner 89143 332249 0 0 3 0x14200 reaper reaper 15957 210294 0 0 3 0x14200 pgdaemon pagedaemon 61565 499417 0 0 3 0x14200 bored viomb 59266 192004 0 0 3 0x40014200 acpi0 acpi0 20782 396580 0 0 3 0x40014200 idle1 56154 86664 0 0 3 0x14200 bored softnet 83038 258964 0 0 3 0x14200 bored systqmp 27234 144257 0 0 3 0x14200 bored systq 35829 426347 0 0 3 0x40014200 bored softclock 76432 98549 0 0 3 0x40014200 idle0 1 217074 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks Process 30014 (syz-executor.0) thread 0xffff8000fffee540 (219428) exclusive kernel_lock &kernel_lock r = 1 (0xffffffff8286b6c8) #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 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10132 6356K 6379K 78643K 11247 0 pcb 13 12K 14K 78643K 17 0 rtable 108 3K 4K 78643K 938 0 ifaddr 39 10K 10K 78643K 96 0 sysctl 2 0K 2K 78643K 6 0 counters 44 34K 34K 78643K 60 0 ioctlops 0 0K 2K 78643K 181 0 iov 0 0K 24K 78643K 1886 0 mount 1 1K 1K 78643K 1 0 log 0 0K 0K 78643K 5 0 vnodes 1209 76K 76K 78643K 2321 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 9K 78643K 187 0 VM map 2 1K 1K 78643K 2 0 sem 12 0K 0K 78643K 1142 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1697 195K 286K 78643K 12598 0 file desc 7 21K 33K 78643K 14112 0 sigio 0 0K 0K 78643K 1307 0 proc 56 74K 99K 78643K 1342 0 subproc 26 1K 1K 78643K 130 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 ip_moptions 0 0K 0K 78643K 21488 0 in_multi 33 2K 2K 78643K 255 0 ether_multi 1 0K 0K 78643K 33 0 mrt 1 0K 0K 78643K 3 0 ISOFS mount 1 32K 32K 78643K 1 0 MSDOSFS mount 1 16K 16K 78643K 1 0 ttys 151 678K 678K 78643K 151 0 exec 0 0K 2K 78643K 2688 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 309 41K 57K 78643K 184500 0 UVM aobj 131 6K 6K 78643K 142 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 0K 78643K 876 0 NDP 5 0K 0K 78643K 33 0 temp 76 4195K 4291K 78643K 34920 0 kqueue 12 18K 24K 78643K 570 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 120 503 0 500 6 5 1 3 0 8 0 rtentry 112 145 0 100 2 0 2 2 0 8 0 unpcb 128 9876 0 9863 58 53 5 7 0 8 4 syncache 296 169 0 169 21 21 0 1 0 8 0 tcpqe 32 25 0 25 10 10 0 1 0 8 0 tcpcb 736 13007 0 13003 222 213 9 21 0 8 8 arp 120 25 0 19 1 0 1 1 0 8 0 ipq 40 18 0 18 8 8 0 1 0 8 0 ipqe 40 542 0 542 8 8 0 1 0 8 0 inpcb 304 18291 0 18284 155 147 8 14 0 8 7 ip6q 72 44 0 44 3 3 0 1 0 8 0 ip6af 40 84 0 84 3 3 0 1 0 8 0 nd6 48 39 0 32 1 0 1 1 0 8 0 kcovpl 48 10 0 8 1 0 1 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 641 0 450 18 6 12 14 0 8 0 art_table 32 642 0 450 2 0 2 2 0 8 0 art_node 16 144 0 103 1 0 1 1 0 8 0 sysvmsgpl 40 30 0 10 1 0 1 1 0 8 0 semapl 112 1140 0 1130 1 0 1 1 0 8 0 shmpl 112 139 0 11 5 1 4 4 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 19682 0 18273 89 0 89 89 0 8 0 ffsino 272 19682 0 18273 95 0 95 95 0 8 0 nchpl 144 39669 0 38067 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 122064 0 122064 1 0 1 1 0 8 1 percpumem 16 42 0 8 1 0 1 1 0 8 0 scxspl 216 120233 0 120233 35 34 1 8 0 8 1 plimitpl 152 1369 0 1359 1 0 1 1 0 8 0 sigapl 424 14310 0 14277 4 0 4 4 0 8 0 futexpl 64 94661 0 94660 1 0 1 1 0 8 0 knotepl 112 110 0 0 3 1 2 3 0 8 0 kqueuepl 216 2852 0 2835 52 47 5 10 0 8 4 pipepl 336 2867 0 2857 118 117 1 9 0 8 0 fdescpl 496 14295 0 14277 3 0 3 3 0 8 0 filepl 152 80841 0 80739 149 139 10 14 0 8 6 lockfpl 104 1798 0 1796 1 0 1 1 0 8 0 lockfspl 48 678 0 676 1 0 1 1 0 8 0 sessionpl 144 25 0 15 1 0 1 1 0 8 0 pgrppl 48 200 0 190 1 0 1 1 0 8 0 ucredpl 96 8812 0 8800 1 0 1 1 0 8 0 zombiepl 144 14277 0 14276 1 0 1 1 0 8 0 processpl 1064 14310 0 14276 3 0 3 3 0 8 0 procpl 672 41808 0 41765 20 15 5 6 0 8 1 sosppl 168 343 0 343 20 20 0 1 0 8 0 sockpl 480 28874 0 28851 453 442 11 33 0 8 8 mcl64k 65536 29 0 0 4 1 3 3 0 8 0 mcl16k 16384 17 0 0 3 0 3 3 0 8 0 mcl12k 12288 45 0 0 2 0 2 2 0 8 0 mcl9k 9216 17 0 0 2 0 2 2 0 8 0 mcl8k 8192 25 0 0 4 1 3 3 0 8 0 mcl4k 4096 17 0 0 3 0 3 3 0 8 0 mcl2k2 2112 12 0 0 1 0 1 1 0 8 0 mcl2k 2048 581 0 0 18 6 12 17 0 8 0 mtagpl 96 2 0 0 1 0 1 1 0 8 0 mbufpl 256 1100 0 0 30 0 30 30 0 8 0 bufpl 288 27758 0 21433 453 1 452 453 0 8 0 anonpl 24 4540064 0 4530942 282 216 66 83 0 186 0 amapchunkpl 152 446722 0 446251 81 60 21 33 0 158 0 amappl16 200 63297 0 63069 262 249 13 27 0 8 0 amappl15 192 2139 0 2134 1 0 1 1 0 8 0 amappl14 184 3 0 3 2 2 0 1 0 8 0 amappl13 176 846 0 844 1 0 1 1 0 8 0 amappl12 168 829 0 825 1 0 1 1 0 8 0 amappl11 160 333 0 320 1 0 1 1 0 8 0 amappl10 152 609 0 602 1 0 1 1 0 8 0 amappl9 144 9175 0 9173 1 0 1 1 0 8 0 amappl8 136 1429 0 1289 5 0 5 5 0 8 0 amappl7 128 671 0 663 1 0 1 1 0 8 0 amappl6 120 9025 0 9012 1 0 1 1 0 8 0 amappl5 112 15274 0 15252 1 0 1 1 0 8 0 amappl4 104 1065 0 1035 1 0 1 1 0 8 0 amappl3 96 1951 0 1935 1 0 1 1 0 8 0 amappl2 88 15640 0 15592 14 12 2 2 0 8 0 amappl1 80 245624 0 245194 12 2 10 12 0 8 0 amappl 88 183564 0 183404 7 2 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 72 141 0 11 3 0 3 3 0 8 0 uaddrrnd 24 14295 0 14277 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 14295 0 14277 1 0 1 1 0 8 0 vmmpekpl 168 106241 0 106222 2 0 2 2 0 8 0 vmmpepl 168 1339802 0 1338184 252 176 76 91 0 357 0 vmsppl 368 14294 0 14277 2 0 2 2 0 8 0 rwobjpl 56 347589 0 340491 128 27 101 104 0 8 0 pdppl 4096 28598 0 28554 68 22 46 50 0 8 2 pvpl 32 7313393 0 7300666 497 384 113 143 0 265 3 pmappl 248 14294 0 14277 2 0 2 2 0 8 0 extentpl 40 58 0 40 1 0 1 1 0 8 0 phpool 112 1135 0 369 23 0 23 23 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x1a: addq $0x8,%rsp x86_ipi_db(ffffffff82783ff0) 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(ffffffff8286b4c0) at __mp_lock+0x122 __mp_lock_spin sys/kern/kern_lock.c:116 [inline] __mp_lock(ffffffff8286b4c0) at __mp_lock+0x122 sys/kern/kern_lock.c:147 softintr_dispatch(0) at softintr_dispatch+0x4e sys/arch/amd64/amd64/softintr.c:90 Xsoftclock() at Xsoftclock+0x1f __mp_lock(ffffffff8286b4c0) at __mp_lock+0x122 __mp_lock_spin sys/kern/kern_lock.c:116 [inline] __mp_lock(ffffffff8286b4c0) at __mp_lock+0x122 sys/kern/kern_lock.c:147 uvm_fault(fffffd806ef47e68,8022bfd7000,0,2) at uvm_fault+0x193 sys/uvm/uvm_fault.c:624 upageflttrap(ffff80002467ecd0,8022bfd7000) at upageflttrap+0x82 sys/arch/amd64/amd64/trap.c:181 usertrap(ffff80002467ecd0) at usertrap+0x214 sys/arch/amd64/amd64/trap.c:403 recall_trap() at recall_trap+0x8 end of kernel end trace frame: 0x801f8c1b9d0, count: 4 ddb{0}> trace x86_ipi_db(ffffffff82783ff0) 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(ffffffff8286b4c0) at __mp_lock+0x122 __mp_lock_spin sys/kern/kern_lock.c:116 [inline] __mp_lock(ffffffff8286b4c0) at __mp_lock+0x122 sys/kern/kern_lock.c:147 softintr_dispatch(0) at softintr_dispatch+0x4e sys/arch/amd64/amd64/softintr.c:90 Xsoftclock() at Xsoftclock+0x1f __mp_lock(ffffffff8286b4c0) at __mp_lock+0x122 __mp_lock_spin sys/kern/kern_lock.c:116 [inline] __mp_lock(ffffffff8286b4c0) at __mp_lock+0x122 sys/kern/kern_lock.c:147 uvm_fault(fffffd806ef47e68,8022bfd7000,0,2) at uvm_fault+0x193 sys/uvm/uvm_fault.c:624 upageflttrap(ffff80002467ecd0,8022bfd7000) at upageflttrap+0x82 sys/arch/amd64/amd64/trap.c:181 usertrap(ffff80002467ecd0) at usertrap+0x214 sys/arch/amd64/amd64/trap.c:403 recall_trap() at recall_trap+0x8 end of kernel end trace frame: 0x801f8c1b9d0, count: -11 ddb{0}> machine ddbcpu 1 Stopped at uvm_fault_lower+0xbb1: movq 0(%rbx),%rdi uvm_fault_lower(ffff8000246a3f60,ffff8000246a3f98,ffff8000246a3ee0,0) at uvm_fault_lower+0xbb1 sys/uvm/uvm_fault.c:1325 uvm_fault(fffffd806ef47e68,20000000,0,2) at uvm_fault+0x24f sys/uvm/uvm_fault.c:640 upageflttrap(ffff8000246a40d0,20000000) at upageflttrap+0x82 sys/arch/amd64/amd64/trap.c:181 usertrap(ffff8000246a40d0) at usertrap+0x214 sys/arch/amd64/amd64/trap.c:403 recall_trap() at recall_trap+0x8 end of kernel end trace frame: 0x7f7ffffd1b90, count: 10 ddb{1}> trace uvm_fault_lower(ffff8000246a3f60,ffff8000246a3f98,ffff8000246a3ee0,0) at uvm_fault_lower+0xbb1 sys/uvm/uvm_fault.c:1325 uvm_fault(fffffd806ef47e68,20000000,0,2) at uvm_fault+0x24f sys/uvm/uvm_fault.c:640 upageflttrap(ffff8000246a40d0,20000000) at upageflttrap+0x82 sys/arch/amd64/amd64/trap.c:181 usertrap(ffff8000246a40d0) at usertrap+0x214 sys/arch/amd64/amd64/trap.c:403 recall_trap() at recall_trap+0x8 end of kernel end trace frame: 0x7f7ffffd1b90, count: -5