uvm_fault(0xfffffd807efff000, 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 *339716 44867 32767 0x10 0 1K syz-executor.1 151964 44867 32767 0x10 0x4000000 0 syz-executor.1 uvm_fault_lower(ffff80002469ccc0,ffff80002469ccf8,ffff80002469cc40,0) at uvm_fault_lower+0xbb1 sys/uvm/uvm_fault.c:1325 uvm_fault(fffffd807efff000,20000000,0,2) at uvm_fault+0x24f sys/uvm/uvm_fault.c:640 upageflttrap(ffff80002469ce30,20000100) at upageflttrap+0x82 sys/arch/amd64/amd64/trap.c:181 usertrap(ffff80002469ce30) at usertrap+0x214 sys/arch/amd64/amd64/trap.c:403 recall_trap() at recall_trap+0x8 end of kernel end trace frame: 0x7f7ffffc86c0, 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(0xfffffd807efff000, 0x0, 0, 1) -> e ddb{1}> trace uvm_fault_lower(ffff80002469ccc0,ffff80002469ccf8,ffff80002469cc40,0) at uvm_fault_lower+0xbb1 sys/uvm/uvm_fault.c:1325 uvm_fault(fffffd807efff000,20000000,0,2) at uvm_fault+0x24f sys/uvm/uvm_fault.c:640 upageflttrap(ffff80002469ce30,20000100) at upageflttrap+0x82 sys/arch/amd64/amd64/trap.c:181 usertrap(ffff80002469ce30) at usertrap+0x214 sys/arch/amd64/amd64/trap.c:403 recall_trap() at recall_trap+0x8 end of kernel end trace frame: 0x7f7ffffc86c0, count: -5 ddb{1}> show registers rdi 0 rsi 0 rbp 0xffff80002469cbb0 rbx 0 rdx 0 rcx 0 rax 0xffff8000ffff2540 r8 0xffffffff81a8edde witness_assert+0x1fe r9 0x5 r10 0x6203f38ff68f07ba r11 0x766c4951043cf8cd r12 0xffff80002469ccc0 r13 0xfffffd806f895000 r14 0 r15 0xffffffff81b25d00 uvn_flush+0x950 rip 0xffffffff817b9101 uvm_fault_lower+0xbb1 cs 0x8 rflags 0x10246 __ALIGN_SIZE+0xf246 rsp 0xffff80002469cb20 ss 0 uvm_fault_lower+0xbb1: movq 0(%rbx),%rdi ddb{1}> show proc PROC (syz-executor.1) pid=339716 stat=onproc flags process=10 proc=0 pri=36, usrpri=86, nice=20 forw=0xffffffffffffffff, list=0xffff8000ffff2a80,0xffff8000ffff3a50 process=0xffff8000ffff4868 user=0xffff800024697000, vmspace=0xfffffd807efff000 estcpu=36, cpticks=2, pctcpu=0.0 user=0, sys=1, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND *44867 339716 67836 32767 7 0x10 syz-executor.1 44867 212684 67836 32767 3 0x4000090 fsleep syz-executor.1 44867 298045 67836 32767 3 0x4000090 fsleep syz-executor.1 44867 151964 67836 32767 7 0x4000010 syz-executor.1 67836 464716 31191 32767 3 0x90 nanoslp syz-executor.1 31191 50302 38452 0 3 0x82 wait syz-executor.1 87181 242895 36801 32767 3 0x90 nanoslp syz-executor.0 36801 245776 38452 0 3 0x82 wait syz-executor.0 99930 356755 0 0 3 0x14200 bored sosplice 38452 498341 16306 0 3 0x82 thrsleep syz-fuzzer 38452 242414 16306 0 3 0x4000082 nanoslp syz-fuzzer 38452 102717 16306 0 3 0x4000082 thrsleep syz-fuzzer 38452 107692 16306 0 3 0x4000082 thrsleep syz-fuzzer 38452 20593 16306 0 3 0x4000082 kqread syz-fuzzer 38452 501708 16306 0 3 0x4000082 thrsleep syz-fuzzer 38452 175317 16306 0 3 0x4000082 thrsleep syz-fuzzer 38452 437796 16306 0 3 0x4000082 thrsleep syz-fuzzer 16306 43025 48294 0 3 0x10008a sigsusp ksh 48294 17894 99213 0 3 0x9a kqread sshd 27327 216583 1 0 3 0x100083 ttyin getty 99213 443722 1 0 3 0x88 kqread sshd 54532 360046 12098 73 3 0x100090 kqread syslogd 12098 172320 1 0 3 0x100082 netio syslogd 44019 480699 1 0 3 0x100080 kqread resolvd 34283 285646 76048 77 3 0x100092 kqread dhcpleased 67190 460794 76048 77 3 0x100092 kqread dhcpleased 76048 42880 1 0 3 0x80 kqread dhcpleased 30223 45572 0 0 3 0x14200 bored smr 76769 481939 0 0 3 0x14200 pgzero zerothread 62198 211932 0 0 3 0x14200 aiodoned aiodoned 89805 437398 0 0 3 0x14200 syncer update 72077 289885 0 0 3 0x14200 cleaner cleaner 18384 457154 0 0 3 0x14200 reaper reaper 46406 405761 0 0 3 0x14200 pgdaemon pagedaemon 75161 71520 0 0 3 0x14200 bored viomb 61137 87287 0 0 3 0x40014200 acpi0 acpi0 7871 266088 0 0 3 0x40014200 idle1 29384 378868 0 0 3 0x14200 bored softnet 26298 272690 0 0 3 0x14200 bored systqmp 69187 324076 0 0 3 0x14200 bored systq 70763 379050 0 0 3 0x40014200 bored softclock 61437 444197 0 0 3 0x40014200 idle0 1 447492 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks Process 44867 (syz-executor.1) thread 0xffff8000ffff2540 (339716) 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 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10151 6394K 6416K 78643K 11327 0 pcb 13 12K 14K 78643K 17 0 rtable 114 3K 3K 78643K 1734 0 ifaddr 39 10K 10K 78643K 238 0 sysctl 3 1K 2K 78643K 6 0 counters 44 34K 34K 78643K 100 0 ioctlops 0 0K 2K 78643K 115 0 iov 0 0K 32K 78643K 1228 0 mount 1 1K 1K 78643K 1 0 log 0 0K 0K 78643K 4 0 vnodes 1209 76K 76K 78643K 3177 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 5K 78643K 133 0 VM map 2 1K 1K 78643K 2 0 sem 12 0K 1K 78643K 2388 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1697 195K 286K 78643K 12598 0 file desc 7 21K 33K 78643K 10239 0 sigio 0 0K 0K 78643K 80 0 proc 56 74K 99K 78643K 1678 0 subproc 26 1K 1K 78643K 390 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 ip_moptions 0 0K 0K 78643K 677 0 in_multi 33 2K 2K 78643K 434 0 ether_multi 1 0K 0K 78643K 54 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 223 996K 996K 78643K 223 0 exec 0 0K 2K 78643K 2315 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 262 35K 51K 78643K 134464 0 UVM aobj 131 4K 5K 78643K 137 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 0K 78643K 342 0 NDP 5 0K 0K 78643K 93 0 temp 76 4195K 4307K 78643K 27642 0 kqueue 12 18K 30K 78643K 2450 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 1248 0 1245 20 19 1 4 0 8 0 rtentry 112 377 0 329 2 0 2 2 0 8 0 unpcb 128 8181 0 8168 96 95 1 9 0 8 0 syncache 296 69 0 69 19 19 0 1 0 8 0 tcpqe 32 68 0 68 12 12 0 1 0 8 0 tcpcb 736 3370 0 3351 140 138 2 18 0 8 0 arp 120 67 0 61 1 0 1 1 0 8 0 ipq 40 19 0 18 7 6 1 1 0 8 0 ipqe 40 346 0 345 7 6 1 1 0 8 0 inpcb 304 7713 0 7703 125 123 2 11 0 8 0 rttmr 72 4 0 4 1 1 0 1 0 8 0 ip6q 72 46 0 46 6 6 0 1 0 8 0 ip6af 40 89 0 89 6 6 0 1 0 8 0 nd6 48 108 0 98 1 0 1 1 0 8 0 kcovpl 48 30 0 28 1 0 1 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 1614 0 1348 23 6 17 17 0 8 0 art_table 32 1615 0 1348 3 0 3 3 0 8 0 art_node 16 376 0 332 1 0 1 1 0 8 0 semupl 112 2 0 2 1 1 0 1 0 8 0 semapl 112 2380 0 2370 1 0 1 1 0 8 0 shmpl 112 134 0 6 4 0 4 4 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 14335 0 12924 91 2 89 89 0 8 0 ffsino 272 14335 0 12924 95 0 95 95 0 8 0 nchpl 144 28173 0 26572 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 91132 0 91132 9 8 1 1 0 8 1 percpumem 16 62 0 28 1 0 1 1 0 8 0 scxspl 216 95786 0 95786 37 36 1 8 0 8 1 plimitpl 152 1615 0 1605 1 0 1 1 0 8 0 sigapl 424 10386 0 10353 4 0 4 4 0 8 0 futexpl 64 70933 0 70931 11 10 1 1 0 8 0 knotepl 112 204 0 0 3 0 3 3 0 8 0 kqueuepl 216 13689 0 13672 147 145 2 9 0 8 0 pipepl 336 11972 0 11961 187 185 2 13 0 8 1 fdescpl 496 10371 0 10353 4 1 3 3 0 8 0 filepl 152 91322 0 91218 262 257 5 19 0 8 1 lockfpl 104 1178 0 1175 1 0 1 1 0 8 0 lockfspl 48 362 0 359 1 0 1 1 0 8 0 sessionpl 144 45 0 35 1 0 1 1 0 8 0 pgrppl 48 141 0 131 1 0 1 1 0 8 0 ucredpl 96 11185 0 11173 1 0 1 1 0 8 0 zombiepl 144 10353 0 10352 1 0 1 1 0 8 0 processpl 1064 10386 0 10352 4 1 3 3 0 8 0 procpl 672 31873 0 31829 34 30 4 6 0 8 0 sosppl 168 113 0 113 25 25 0 1 0 8 0 sockpl 480 17485 0 17459 473 469 4 33 0 8 0 mcl64k 65536 41 0 0 4 1 3 3 0 8 0 mcl16k 16384 17 0 0 3 0 3 3 0 8 0 mcl12k 12288 49 0 0 2 0 2 2 0 8 0 mcl9k 9216 18 0 0 2 0 2 2 0 8 0 mcl8k 8192 25 0 0 4 1 3 3 0 8 0 mcl4k 4096 26 0 0 4 1 3 3 0 8 0 mcl2k2 2112 17 0 0 2 0 2 2 0 8 0 mcl2k 2048 369 0 0 21 5 16 21 0 8 0 mtagpl 96 2 0 0 1 0 1 1 0 8 0 mbufpl 256 1338 0 0 43 7 36 36 0 8 0 bufpl 288 19962 0 13637 452 0 452 452 0 8 0 anonpl 24 3152570 0 3140134 241 147 94 108 0 186 0 amapchunkpl 152 344294 0 343721 172 148 24 38 0 158 0 amappl16 200 31353 0 31021 168 150 18 31 0 8 0 amappl15 192 760 0 754 1 0 1 1 0 8 0 amappl14 184 328 0 328 5 5 0 1 0 8 0 amappl13 176 767 0 764 1 0 1 1 0 8 0 amappl12 168 70 0 66 1 0 1 1 0 8 0 amappl11 160 3695 0 3681 1 0 1 1 0 8 0 amappl10 152 2021 0 2019 1 0 1 1 0 8 0 amappl9 144 1821 0 1817 1 0 1 1 0 8 0 amappl8 136 2366 0 2281 3 0 3 3 0 8 0 amappl7 128 1580 0 1571 1 0 1 1 0 8 0 amappl6 120 1748 0 1737 1 0 1 1 0 8 0 amappl5 112 8576 0 8559 1 0 1 1 0 8 0 amappl4 104 8640 0 8613 1 0 1 1 0 8 0 amappl3 96 1015 0 998 1 0 1 1 0 8 0 amappl2 88 11591 0 11546 4 2 2 2 0 8 0 amappl1 80 186733 0 186304 12 2 10 12 0 8 0 amappl 88 133245 0 133078 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 72 136 0 6 3 0 3 3 0 8 0 uaddrrnd 24 10371 0 10353 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 10371 0 10353 1 0 1 1 0 8 0 vmmpekpl 168 122189 0 122162 6 3 3 6 0 8 0 vmmpepl 168 965893 0 964239 262 184 78 92 0 357 0 vmsppl 368 10370 0 10353 2 0 2 2 0 8 0 rwobjpl 56 246353 0 239195 128 26 102 105 0 8 0 pdppl 4096 20750 0 20706 73 27 46 50 0 8 2 pvpl 32 5512749 0 5496715 567 423 144 205 0 265 0 pmappl 248 10370 0 10353 2 0 2 2 0 8 0 extentpl 40 57 0 38 1 0 1 1 0 8 0 phpool 112 1158 0 383 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+0x122 __mp_lock_spin sys/kern/kern_lock.c:116 [inline] __mp_lock(ffffffff828b6eb0) 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(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(ffff800024690060) at syscall+0x3ef mi_syscall sys/sys/syscall_mi.h:93 [inline] syscall(ffff800024690060) at syscall+0x3ef sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xf1f592c2860, count: 6 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+0x122 __mp_lock_spin sys/kern/kern_lock.c:116 [inline] __mp_lock(ffffffff828b6eb0) 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(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(ffff800024690060) at syscall+0x3ef mi_syscall sys/sys/syscall_mi.h:93 [inline] syscall(ffff800024690060) at syscall+0x3ef sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xf1f592c2860, count: -9 ddb{0}> machine ddbcpu 1 Stopped at uvm_fault_lower+0xbb1: movq 0(%rbx),%rdi uvm_fault_lower(ffff80002469ccc0,ffff80002469ccf8,ffff80002469cc40,0) at uvm_fault_lower+0xbb1 sys/uvm/uvm_fault.c:1325 uvm_fault(fffffd807efff000,20000000,0,2) at uvm_fault+0x24f sys/uvm/uvm_fault.c:640 upageflttrap(ffff80002469ce30,20000100) at upageflttrap+0x82 sys/arch/amd64/amd64/trap.c:181 usertrap(ffff80002469ce30) at usertrap+0x214 sys/arch/amd64/amd64/trap.c:403 recall_trap() at recall_trap+0x8 end of kernel end trace frame: 0x7f7ffffc86c0, count: 10 ddb{1}> trace uvm_fault_lower(ffff80002469ccc0,ffff80002469ccf8,ffff80002469cc40,0) at uvm_fault_lower+0xbb1 sys/uvm/uvm_fault.c:1325 uvm_fault(fffffd807efff000,20000000,0,2) at uvm_fault+0x24f sys/uvm/uvm_fault.c:640 upageflttrap(ffff80002469ce30,20000100) at upageflttrap+0x82 sys/arch/amd64/amd64/trap.c:181 usertrap(ffff80002469ce30) at usertrap+0x214 sys/arch/amd64/amd64/trap.c:403 recall_trap() at recall_trap+0x8 end of kernel end trace frame: 0x7f7ffffc86c0, count: -5