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 *365914 37417 32767 0x10 0 0K syz-executor.1 301394 37417 32767 0x10 0x4000000 1 syz-executor.1 uvm_fault_lower(ffff8000246dc240,ffff8000246dc278,ffff8000246dc1c0,0) at uvm_fault_lower+0xbb1 sys/uvm/uvm_fault.c:1325 uvm_fault(fffffd807efff730,20001000,0,2) at uvm_fault+0x24f sys/uvm/uvm_fault.c:640 upageflttrap(ffff8000246dc3b0,20001000) at upageflttrap+0x82 sys/arch/amd64/amd64/trap.c:181 usertrap(ffff8000246dc3b0) at usertrap+0x214 sys/arch/amd64/amd64/trap.c:403 recall_trap() at recall_trap+0x8 end of kernel end trace frame: 0x7f7ffffea460, 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(0xfffffd807efff730, 0x0, 0, 1) -> e ddb{0}> trace uvm_fault_lower(ffff8000246dc240,ffff8000246dc278,ffff8000246dc1c0,0) at uvm_fault_lower+0xbb1 sys/uvm/uvm_fault.c:1325 uvm_fault(fffffd807efff730,20001000,0,2) at uvm_fault+0x24f sys/uvm/uvm_fault.c:640 upageflttrap(ffff8000246dc3b0,20001000) at upageflttrap+0x82 sys/arch/amd64/amd64/trap.c:181 usertrap(ffff8000246dc3b0) at usertrap+0x214 sys/arch/amd64/amd64/trap.c:403 recall_trap() at recall_trap+0x8 end of kernel end trace frame: 0x7f7ffffea460, count: -5 ddb{0}> show registers rdi 0 rsi 0 rbp 0xffff8000246dc130 rbx 0 rdx 0 rcx 0 rax 0xffff80002469d7a0 r8 0xffffffff81a8edde witness_assert+0x1fe r9 0x5 r10 0x57458ad8589e8fcf r11 0xbf71cc328873a6e4 r12 0xffff8000246dc240 r13 0xfffffd807ea5b3c0 r14 0 r15 0xffffffff81b25d00 uvn_flush+0x950 rip 0xffffffff817b9101 uvm_fault_lower+0xbb1 cs 0x8 rflags 0x10246 __ALIGN_SIZE+0xf246 rsp 0xffff8000246dc0a0 ss 0 uvm_fault_lower+0xbb1: movq 0(%rbx),%rdi ddb{0}> show proc PROC (syz-executor.1) pid=365914 stat=onproc flags process=10 proc=0 pri=36, usrpri=73, nice=20 forw=0xffffffffffffffff, list=0xffff80002469d500,0xffff80002469c010 process=0xffff8000ffffa570 user=0xffff8000246d7000, vmspace=0xfffffd807efff730 estcpu=36, cpticks=1, pctcpu=0.0 user=0, sys=1, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND *37417 365914 94947 32767 7 0x10 syz-executor.1 37417 101026 94947 32767 3 0x4000090 fsleep syz-executor.1 37417 301394 94947 32767 7 0x4000010 syz-executor.1 23667 239418 27116 32767 2 0x490 syz-executor.0 23667 170997 27116 32767 3 0x4000090 fsleep syz-executor.0 23667 308086 27116 32767 3 0x4000090 fsleep syz-executor.0 94947 230142 42124 32767 2 0x490 syz-executor.1 42124 369136 51465 0 3 0x82 wait syz-executor.1 27116 106700 63240 32767 3 0x90 nanoslp syz-executor.0 63240 249013 51465 0 3 0x82 wait syz-executor.0 47291 38979 0 0 3 0x14200 bored sosplice 51465 515518 5868 0 3 0x82 thrsleep syz-fuzzer 51465 414201 5868 0 2 0x4000482 syz-fuzzer 51465 143073 5868 0 3 0x4000082 thrsleep syz-fuzzer 51465 388651 5868 0 3 0x4000082 thrsleep syz-fuzzer 51465 240780 5868 0 3 0x4000082 kqread syz-fuzzer 51465 400327 5868 0 3 0x4000082 thrsleep syz-fuzzer 51465 453352 5868 0 3 0x4000082 thrsleep syz-fuzzer 51465 507681 5868 0 3 0x4000082 thrsleep syz-fuzzer 5868 148398 65763 0 3 0x10008a sigsusp ksh 65763 57409 58335 0 3 0x9a kqread sshd 26650 294194 1 0 3 0x100083 ttyin getty 58335 261503 1 0 3 0x88 kqread sshd 80862 146722 60786 73 3 0x100090 kqread syslogd 60786 98278 1 0 3 0x100082 netio syslogd 82837 448953 1 0 3 0x100080 kqread resolvd 43347 146435 98032 77 3 0x100092 kqread dhcpleased 78309 24218 98032 77 3 0x100092 kqread dhcpleased 98032 284592 1 0 3 0x80 kqread dhcpleased 65625 307910 0 0 3 0x14200 bored smr 65460 377353 0 0 3 0x14200 pgzero zerothread 15341 445307 0 0 3 0x14200 aiodoned aiodoned 47181 41442 0 0 3 0x14200 syncer update 68758 57468 0 0 3 0x14200 cleaner cleaner 84824 229160 0 0 3 0x14200 reaper reaper 70034 323100 0 0 3 0x14200 pgdaemon pagedaemon 55530 250747 0 0 3 0x14200 bored viomb 40575 140200 0 0 3 0x40014200 acpi0 acpi0 85461 331748 0 0 3 0x40014200 idle1 86061 398157 0 0 3 0x14200 bored softnet 23105 312408 0 0 3 0x14200 bored systqmp 77416 427690 0 0 3 0x14200 bored systq 27068 246197 0 0 3 0x40014200 bored softclock 18642 350947 0 0 3 0x40014200 idle0 1 198717 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks Process 37417 (syz-executor.1) thread 0xffff80002469d7a0 (365914) 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 37417 (syz-executor.1) thread 0xffff80002469cfc0 (301394) 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 10172 6397K 6416K 78643K 11420 0 pcb 13 16K 20K 78643K 19 0 rtable 106 3K 4K 78643K 4244 0 ifaddr 39 10K 10K 78643K 406 0 sysctl 3 1K 1K 78643K 3 0 counters 44 34K 34K 78643K 148 0 ioctlops 0 0K 2K 78643K 551 0 iov 0 0K 28K 78643K 4992 0 mount 1 1K 1K 78643K 1 0 log 0 0K 0K 78643K 5 0 vnodes 1209 76K 76K 78643K 11641 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 5K 78643K 406 0 VM map 2 1K 1K 78643K 2 0 sem 12 1K 1K 78643K 5524 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1697 195K 286K 78643K 12598 0 file desc 8 25K 33K 78643K 40295 0 sigio 0 0K 0K 78643K 1138 0 proc 56 74K 99K 78643K 3989 0 subproc 26 1K 1K 78643K 702 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 ip_moptions 0 0K 0K 78643K 3818 0 in_multi 33 2K 2K 78643K 1020 0 ether_multi 1 0K 0K 78643K 166 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 349 1553K 1553K 78643K 349 0 exec 0 0K 2K 78643K 6646 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 37K 53K 78643K 531079 0 UVM aobj 131 4K 4K 78643K 134 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 0K 78643K 965 0 NDP 5 0K 0K 78643K 165 0 temp 76 4195K 4307K 78643K 97083 0 kqueue 18 25K 39K 78643K 2781 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 4267 0 4264 61 60 1 5 0 8 0 rtentry 112 681 0 637 2 0 2 2 0 8 0 unpcb 128 28497 0 28484 274 271 3 9 0 8 2 syncache 296 304 0 304 84 84 0 1 0 8 0 tcpqe 32 98 0 98 43 43 0 1 0 8 0 tcpcb 736 42682 0 42677 863 860 3 29 0 8 2 arp 120 121 0 115 1 0 1 1 0 8 0 ipq 40 62 0 62 27 27 0 1 0 8 0 ipqe 40 756 0 756 27 27 0 1 0 8 0 inpcb 304 59421 0 59414 570 569 1 16 0 8 0 rttmr 72 153 0 153 4 4 0 1 0 8 0 ip6q 72 248 0 248 23 23 0 1 0 8 0 ip6af 40 517 0 517 23 23 0 1 0 8 0 nd6 48 211 0 205 1 0 1 1 0 8 0 kcovpl 48 54 0 52 1 0 1 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 2984 0 2793 36 22 14 19 0 8 0 art_table 32 2985 0 2793 6 4 2 3 0 8 0 art_node 16 680 0 640 1 0 1 1 0 8 0 semapl 112 5522 0 5512 1 0 1 1 0 8 0 shmpl 112 131 0 3 4 0 4 4 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 56836 0 55365 99 6 93 93 0 8 0 ffsino 272 56836 0 55365 99 0 99 99 0 8 0 nchpl 144 111608 0 110004 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 381857 0 381857 17 16 1 1 0 8 1 percpumem 16 86 0 52 1 0 1 1 0 8 0 scxspl 216 329938 0 329938 134 133 1 8 0 8 1 plimitpl 152 8396 0 8386 1 0 1 1 0 8 0 sigapl 424 40361 0 40327 4 0 4 4 0 8 0 futexpl 64 281581 0 281578 15 14 1 1 0 8 0 knotepl 112 547 0 0 4 0 4 4 0 8 0 kqueuepl 216 15846 0 15805 264 259 5 13 0 8 2 pipepl 336 16257 0 16244 330 326 4 11 0 8 2 fdescpl 496 40346 0 40327 3 0 3 3 0 8 0 filepl 152 317026 0 316918 492 485 7 14 0 8 2 lockfpl 104 5503 0 5500 5 4 1 2 0 8 0 lockfspl 48 1546 0 1543 1 0 1 1 0 8 0 sessionpl 144 69 0 59 1 0 1 1 0 8 0 pgrppl 48 459 0 449 1 0 1 1 0 8 0 ucredpl 96 57949 0 57937 1 0 1 1 0 8 0 zombiepl 144 40327 0 40327 4 3 1 1 0 8 1 processpl 1064 40361 0 40327 3 0 3 3 0 8 0 procpl 672 125977 0 125932 58 53 5 6 0 8 0 srpgc 96 1 0 1 1 1 0 1 0 8 0 sosppl 168 463 0 463 75 75 0 1 0 8 0 sockpl 480 93935 0 93912 1705 1694 11 33 0 8 8 mcl64k 65536 70 0 0 5 2 3 3 0 8 0 mcl16k 16384 41 0 0 3 0 3 3 0 8 0 mcl12k 12288 88 0 0 3 1 2 2 0 8 0 mcl9k 9216 35 0 0 3 1 2 2 0 8 0 mcl8k 8192 33 0 0 4 1 3 3 0 8 0 mcl4k 4096 62 0 0 6 4 2 3 0 8 0 mcl2k2 2112 23 0 0 2 0 2 2 0 8 0 mcl2k 2048 750 0 0 26 16 10 21 0 8 0 mtagpl 96 2 0 0 1 0 1 1 0 8 0 mbufpl 256 9540 0 0 563 1 562 562 0 8 0 bufpl 288 75160 0 68835 454 1 453 453 0 8 0 anonpl 24 12007993 0 11995515 704 615 89 106 0 186 0 amapchunkpl 152 1349601 0 1349035 393 370 23 37 0 158 0 amappl16 200 117137 0 116761 537 516 21 35 0 8 0 amappl15 192 5652 0 5647 1 0 1 1 0 8 0 amappl14 184 2820 0 2819 1 0 1 1 0 8 0 amappl13 176 2903 0 2897 1 0 1 1 0 8 0 amappl12 168 4717 0 4713 1 0 1 1 0 8 0 amappl11 160 8703 0 8690 1 0 1 1 0 8 0 amappl10 152 9685 0 9681 1 0 1 1 0 8 0 amappl9 144 4530 0 4527 1 0 1 1 0 8 0 amappl8 136 4829 0 4673 6 0 6 6 0 8 0 amappl7 128 3313 0 3306 1 0 1 1 0 8 0 amappl6 120 4594 0 4576 1 0 1 1 0 8 0 amappl5 112 41934 0 41915 1 0 1 1 0 8 0 amappl4 104 14737 0 14713 1 0 1 1 0 8 0 amappl3 96 8480 0 8460 1 0 1 1 0 8 0 amappl2 88 49426 0 49374 5 3 2 2 0 8 0 amappl1 80 708176 0 707728 12 2 10 12 0 8 0 amappl 88 528360 0 528184 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 72 133 0 3 3 0 3 3 0 8 0 uaddrrnd 24 40346 0 40327 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 40346 0 40327 1 0 1 1 0 8 0 vmmpekpl 168 339226 0 339204 2 0 2 2 0 8 0 vmmpepl 168 3757959 0 3756092 629 539 90 106 0 357 0 vmsppl 368 40345 0 40327 2 0 2 2 0 8 0 rwobjpl 56 930339 0 923050 248 144 104 107 0 8 0 pdppl 4096 80700 0 80654 80 34 46 50 0 8 0 pvpl 32 19736565 0 19720255 1281 1139 142 206 0 265 0 pmappl 248 40345 0 40327 2 0 2 2 0 8 0 extentpl 40 57 0 38 1 0 1 1 0 8 0 phpool 112 2594 0 1291 39 1 38 39 0 8 0 ddb{0}> machine ddbcpu 0 Invalid cpu 0 ddb{0}> trace uvm_fault_lower(ffff8000246dc240,ffff8000246dc278,ffff8000246dc1c0,0) at uvm_fault_lower+0xbb1 sys/uvm/uvm_fault.c:1325 uvm_fault(fffffd807efff730,20001000,0,2) at uvm_fault+0x24f sys/uvm/uvm_fault.c:640 upageflttrap(ffff8000246dc3b0,20001000) at upageflttrap+0x82 sys/arch/amd64/amd64/trap.c:181 usertrap(ffff8000246dc3b0) at usertrap+0x214 sys/arch/amd64/amd64/trap.c:403 recall_trap() at recall_trap+0x8 end of kernel end trace frame: 0x7f7ffffea460, 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(fffffd807efff730,1f574e54000,0,2) at uvm_fault+0x193 sys/uvm/uvm_fault.c:624 upageflttrap(ffff8000246f0040,1f574e54000) at upageflttrap+0x82 sys/arch/amd64/amd64/trap.c:181 usertrap(ffff8000246f0040) at usertrap+0x214 sys/arch/amd64/amd64/trap.c:403 recall_trap() at recall_trap+0x8 end of kernel end trace frame: 0x1f4d44a3c00, 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(fffffd807efff730,1f574e54000,0,2) at uvm_fault+0x193 sys/uvm/uvm_fault.c:624 upageflttrap(ffff8000246f0040,1f574e54000) at upageflttrap+0x82 sys/arch/amd64/amd64/trap.c:181 usertrap(ffff8000246f0040) at usertrap+0x214 sys/arch/amd64/amd64/trap.c:403 recall_trap() at recall_trap+0x8 end of kernel end trace frame: 0x1f4d44a3c00, count: -8