uvm_fault(0xfffffd806efef008, 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 *133535 42053 32767 0x10 0 0K syz-executor.1 116326 42053 32767 0x10 0x4000000 1 syz-executor.1 uvm_fault_lower(ffff80002469aad0,ffff80002469ab08,ffff80002469aa50,0) at uvm_fault_lower+0xbb1 sys/uvm/uvm_fault.c:1325 uvm_fault(fffffd806efef008,20000000,0,2) at uvm_fault+0x24f sys/uvm/uvm_fault.c:640 upageflttrap(ffff80002469ac40,20000000) at upageflttrap+0x82 sys/arch/amd64/amd64/trap.c:181 usertrap(ffff80002469ac40) at usertrap+0x214 sys/arch/amd64/amd64/trap.c:403 recall_trap() at recall_trap+0x8 end of kernel end trace frame: 0x7f7fffff4740, 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(0xfffffd806efef008, 0x0, 0, 1) -> e ddb{0}> trace uvm_fault_lower(ffff80002469aad0,ffff80002469ab08,ffff80002469aa50,0) at uvm_fault_lower+0xbb1 sys/uvm/uvm_fault.c:1325 uvm_fault(fffffd806efef008,20000000,0,2) at uvm_fault+0x24f sys/uvm/uvm_fault.c:640 upageflttrap(ffff80002469ac40,20000000) at upageflttrap+0x82 sys/arch/amd64/amd64/trap.c:181 usertrap(ffff80002469ac40) at usertrap+0x214 sys/arch/amd64/amd64/trap.c:403 recall_trap() at recall_trap+0x8 end of kernel end trace frame: 0x7f7fffff4740, count: -5 ddb{0}> show registers rdi 0 rsi 0 rbp 0xffff80002469a9c0 rbx 0 rdx 0 rcx 0 rax 0xffff8000fffee2a0 r8 0xffffffff81a8edde witness_assert+0x1fe r9 0x5 r10 0xe01393ba96f382d5 r11 0xb3ff29ea6640bea0 r12 0xffff80002469aad0 r13 0xfffffd8069403e88 r14 0 r15 0x690 rip 0xffffffff817b9101 uvm_fault_lower+0xbb1 cs 0x8 rflags 0x10246 __ALIGN_SIZE+0xf246 rsp 0xffff80002469a930 ss 0 uvm_fault_lower+0xbb1: movq 0(%rbx),%rdi ddb{0}> show proc PROC (syz-executor.1) pid=133535 stat=onproc flags process=10 proc=0 pri=32, usrpri=86, nice=20 forw=0xffffffffffffffff, list=0xffff8000fffeed20,0xffff8000fffef7b0 process=0xffff8000ffffa148 user=0xffff800024695000, vmspace=0xfffffd806efef008 estcpu=36, cpticks=0, pctcpu=0.0 user=0, sys=0, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND *42053 133535 30060 32767 7 0x10 syz-executor.1 42053 116326 30060 32767 7 0x4000010 syz-executor.1 67051 331098 0 0 3 0x14200 bored sosplice 30060 169723 96346 32767 3 0x90 nanoslp syz-executor.1 64293 373054 191 32767 3 0x90 nanoslp syz-executor.0 96346 255300 23722 0 3 0x82 wait syz-executor.1 191 360157 23722 0 3 0x82 wait syz-executor.0 23722 437214 94944 0 3 0x82 thrsleep syz-fuzzer 23722 67124 94944 0 3 0x4000082 thrsleep syz-fuzzer 23722 414560 94944 0 3 0x4000082 thrsleep syz-fuzzer 23722 377399 94944 0 3 0x4000082 thrsleep syz-fuzzer 23722 480432 94944 0 3 0x4000082 kqread syz-fuzzer 23722 72134 94944 0 3 0x4000082 thrsleep syz-fuzzer 23722 345916 94944 0 3 0x4000082 thrsleep syz-fuzzer 23722 373315 94944 0 3 0x4000082 thrsleep syz-fuzzer 94944 21973 93805 0 3 0x10008a sigsusp ksh 93805 378078 46513 0 3 0x9a kqread sshd 87183 513893 1 0 3 0x100083 ttyin getty 46513 351829 1 0 3 0x88 kqread sshd 97727 136098 11488 73 3 0x100090 kqread syslogd 11488 24169 1 0 3 0x100082 netio syslogd 58718 428604 1 0 3 0x100080 kqread resolvd 76266 441340 2845 77 3 0x100092 kqread dhcpleased 36714 124492 2845 77 3 0x100092 kqread dhcpleased 2845 338933 1 0 3 0x80 kqread dhcpleased 83044 497065 0 0 3 0x14200 bored smr 86461 6265 0 0 2 0x14200 zerothread 12590 381698 0 0 3 0x14200 aiodoned aiodoned 74723 240288 0 0 3 0x14200 syncer update 89941 330812 0 0 3 0x14200 cleaner cleaner 87700 166059 0 0 3 0x14200 reaper reaper 83387 501241 0 0 3 0x14200 pgdaemon pagedaemon 68900 383997 0 0 3 0x14200 bored viomb 48082 424801 0 0 3 0x40014200 acpi0 acpi0 93285 47025 0 0 3 0x40014200 idle1 53609 466373 0 0 3 0x14200 bored softnet 38417 37181 0 0 3 0x14200 bored systqmp 61876 413396 0 0 3 0x14200 bored systq 72044 387799 0 0 3 0x40014200 bored softclock 41741 375304 0 0 3 0x40014200 idle0 1 82722 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks Process 42053 (syz-executor.1) thread 0xffff8000fffee2a0 (133535) 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 10152 6394K 6416K 78643K 11244 0 pcb 13 12K 14K 78643K 17 0 rtable 124 3K 4K 78643K 331 0 ifaddr 39 10K 10K 78643K 39 0 sysctl 2 0K 0K 78643K 2 0 counters 44 34K 34K 78643K 44 0 ioctlops 0 0K 2K 78643K 39 0 iov 0 0K 16K 78643K 705 0 mount 1 1K 1K 78643K 1 0 log 0 0K 0K 78643K 5 0 vnodes 1209 76K 76K 78643K 2012 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 5K 78643K 55 0 VM map 2 1K 1K 78643K 2 0 sem 12 0K 0K 78643K 1927 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1697 195K 286K 78643K 12598 0 file desc 7 21K 33K 78643K 4207 0 sigio 0 0K 0K 78643K 11 0 proc 56 74K 87K 78643K 569 0 subproc 26 1K 1K 78643K 26 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 ip_moptions 0 0K 0K 78643K 362 0 in_multi 33 2K 2K 78643K 97 0 ether_multi 1 0K 0K 78643K 18 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 229 1023K 1023K 78643K 229 0 exec 0 0K 2K 78643K 780 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 30K 46K 78643K 57795 0 UVM aobj 131 4K 4K 78643K 159 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 0K 78643K 1284 0 NDP 5 0K 0K 78643K 9 0 temp 76 4195K 4275K 78643K 11298 0 kqueue 12 18K 22K 78643K 242 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 120 244 0 241 4 3 1 3 0 8 0 rtentry 112 55 0 2 2 0 2 2 0 8 0 unpcb 128 3870 0 3857 33 32 1 5 0 8 0 syncache 296 32 0 32 9 9 0 1 0 8 0 tcpqe 32 67 0 67 4 4 0 1 0 8 0 tcpcb 736 5088 0 5082 114 105 9 18 0 8 8 arp 120 8 0 0 1 0 1 1 0 8 0 ipq 40 8 0 8 2 2 0 1 0 8 0 ipqe 40 144 0 144 2 2 0 1 0 8 0 inpcb 304 6642 0 6632 69 60 9 12 0 8 8 ip6q 72 2 0 2 1 1 0 1 0 8 0 ip6af 40 4 0 4 1 1 0 1 0 8 0 nd6 48 14 0 1 1 0 1 1 0 8 0 kcovpl 48 2 0 0 1 0 1 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 295 0 2 19 0 19 19 0 8 0 art_table 32 296 0 2 3 0 3 3 0 8 0 art_node 16 54 0 5 1 0 1 1 0 8 0 sysvmsgpl 40 4 0 2 1 0 1 1 0 8 0 semapl 112 1922 0 1912 1 0 1 1 0 8 0 shmpl 112 156 0 28 4 0 4 4 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 7025 0 5613 89 0 89 89 0 8 0 ffsino 272 7025 0 5613 95 0 95 95 0 8 0 nchpl 144 12671 0 11057 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 39260 0 39260 1 0 1 1 0 8 1 percpumem 16 34 0 0 1 0 1 1 0 8 0 scxspl 216 37883 0 37883 24 23 1 8 0 8 1 plimitpl 152 1111 0 1101 1 0 1 1 0 8 0 sigapl 424 4429 0 4396 4 0 4 4 0 8 0 futexpl 64 30144 0 30143 1 0 1 1 0 8 0 knotepl 112 120 0 0 3 0 3 3 0 8 0 kqueuepl 216 2375 0 2361 40 35 5 8 0 8 4 pipepl 336 1059 0 1049 37 35 2 11 0 8 1 fdescpl 496 4414 0 4396 3 0 3 3 0 8 0 filepl 152 32493 0 32389 63 55 8 15 0 8 3 lockfpl 104 724 0 722 1 0 1 1 0 8 0 lockfspl 48 214 0 212 1 0 1 1 0 8 0 sessionpl 144 17 0 7 1 0 1 1 0 8 0 pgrppl 48 30 0 20 1 0 1 1 0 8 0 ucredpl 96 5395 0 5383 1 0 1 1 0 8 0 zombiepl 144 4396 0 4395 1 0 1 1 0 8 0 processpl 1064 4429 0 4395 3 0 3 3 0 8 0 procpl 672 13861 0 13819 9 4 5 6 0 8 1 sosppl 168 55 0 55 6 6 0 1 0 8 0 sockpl 480 11144 0 11121 146 135 11 24 0 8 8 mcl64k 65536 19 0 0 3 0 3 3 0 8 0 mcl16k 16384 10 0 0 2 0 2 2 0 8 0 mcl12k 12288 18 0 0 2 0 2 2 0 8 0 mcl9k 9216 10 0 0 1 0 1 1 0 8 0 mcl8k 8192 10 0 0 2 0 2 2 0 8 0 mcl4k 4096 18 0 0 3 0 3 3 0 8 0 mcl2k2 2112 12 0 0 1 0 1 1 0 8 0 mcl2k 2048 174 0 0 20 2 18 20 0 8 0 mtagpl 96 2 0 0 1 0 1 1 0 8 0 mbufpl 256 397 0 0 20 0 20 20 0 8 0 bufpl 288 11199 0 4877 452 0 452 452 0 8 0 anonpl 24 1334627 0 1322382 168 89 79 103 0 186 0 amapchunkpl 152 141008 0 140462 63 39 24 36 0 158 1 amappl16 200 14666 0 14307 85 65 20 32 0 8 0 amappl15 192 71 0 65 1 0 1 1 0 8 0 amappl14 184 2 0 1 1 0 1 1 0 8 0 amappl13 176 27 0 26 1 0 1 1 0 8 0 amappl12 168 15 0 11 1 0 1 1 0 8 0 amappl11 160 69 0 55 1 0 1 1 0 8 0 amappl10 152 2161 0 2157 1 0 1 1 0 8 0 amappl9 144 2277 0 2272 1 0 1 1 0 8 0 amappl8 136 402 0 344 3 0 3 3 0 8 0 amappl7 128 52 0 44 1 0 1 1 0 8 0 amappl6 120 2080 0 2068 1 0 1 1 0 8 0 amappl5 112 6699 0 6678 1 0 1 1 0 8 0 amappl4 104 591 0 567 1 0 1 1 0 8 0 amappl3 96 453 0 435 1 0 1 1 0 8 0 amappl2 88 4791 0 4747 2 0 2 2 0 8 1 amappl1 80 79944 0 79514 12 2 10 12 0 8 0 amappl 88 57326 0 57176 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 72 158 0 28 3 0 3 3 0 8 0 uaddrrnd 24 4414 0 4396 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 4414 0 4396 1 0 1 1 0 8 0 vmmpekpl 168 36524 0 36496 2 0 2 2 0 8 0 vmmpepl 168 412868 0 411214 123 45 78 87 0 357 1 vmsppl 368 4413 0 4396 2 0 2 2 0 8 0 rwobjpl 56 111742 0 104583 105 3 102 102 0 8 0 pdppl 4096 8836 0 8792 63 17 46 50 0 8 2 pvpl 32 2176836 0 2161068 267 129 138 175 0 265 5 pmappl 248 4413 0 4396 2 0 2 2 0 8 0 extentpl 40 57 0 38 1 0 1 1 0 8 0 phpool 112 929 0 161 25 2 23 23 0 8 0 ddb{0}> machine ddbcpu 0 Invalid cpu 0 ddb{0}> trace uvm_fault_lower(ffff80002469aad0,ffff80002469ab08,ffff80002469aa50,0) at uvm_fault_lower+0xbb1 sys/uvm/uvm_fault.c:1325 uvm_fault(fffffd806efef008,20000000,0,2) at uvm_fault+0x24f sys/uvm/uvm_fault.c:640 upageflttrap(ffff80002469ac40,20000000) at upageflttrap+0x82 sys/arch/amd64/amd64/trap.c:181 usertrap(ffff80002469ac40) at usertrap+0x214 sys/arch/amd64/amd64/trap.c:403 recall_trap() at recall_trap+0x8 end of kernel end trace frame: 0x7f7fffff4740, 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 sleep_setup(ffff800022c8de90,ffff8000fffef7a0,120,ffffffff824481fc,0) at sleep_setup+0xd3 sys/kern/kern_synch.c:370 rwsleep(ffff8000fffef7a0,ffffffff827bb490,120,ffffffff824481fc,0) at rwsleep+0xc1 sys/kern/kern_synch.c:311 futex_wait(abef13191f0,6,0,2) at futex_wait+0x13c sys/kern/sys_futex.c:260 sys_futex(ffff8000fffef7a0,ffff800022c8e020,ffff800022c8e080) at sys_futex+0xf8 sys/kern/sys_futex.c:111 syscall(ffff800022c8e0f0) at syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff800022c8e0f0) at syscall+0x489 sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xabef89226f0, count: 5 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 sleep_setup(ffff800022c8de90,ffff8000fffef7a0,120,ffffffff824481fc,0) at sleep_setup+0xd3 sys/kern/kern_synch.c:370 rwsleep(ffff8000fffef7a0,ffffffff827bb490,120,ffffffff824481fc,0) at rwsleep+0xc1 sys/kern/kern_synch.c:311 futex_wait(abef13191f0,6,0,2) at futex_wait+0x13c sys/kern/sys_futex.c:260 sys_futex(ffff8000fffef7a0,ffff800022c8e020,ffff800022c8e080) at sys_futex+0xf8 sys/kern/sys_futex.c:111 syscall(ffff800022c8e0f0) at syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff800022c8e0f0) at syscall+0x489 sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xabef89226f0, count: -10