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 * 87800 904 32767 0x10 0 1K syz-executor.0 320655 904 32767 0x10 0x4000000 0 syz-executor.0 uvm_fault_lower(ffff80002468b0a0,ffff80002468b0d8,ffff80002468b020,0) 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(ffff80002468b210,20000080) at upageflttrap+0x82 sys/arch/amd64/amd64/trap.c:181 usertrap(ffff80002468b210) at usertrap+0x214 sys/arch/amd64/amd64/trap.c:403 recall_trap() at recall_trap+0x8 end of kernel end trace frame: 0x7f7ffffccd40, 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(ffff80002468b0a0,ffff80002468b0d8,ffff80002468b020,0) 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(ffff80002468b210,20000080) at upageflttrap+0x82 sys/arch/amd64/amd64/trap.c:181 usertrap(ffff80002468b210) at usertrap+0x214 sys/arch/amd64/amd64/trap.c:403 recall_trap() at recall_trap+0x8 end of kernel end trace frame: 0x7f7ffffccd40, count: -5 ddb{1}> show registers rdi 0 rsi 0 rbp 0xffff80002468af90 rbx 0 rdx 0 rcx 0x8 rax 0xffff80002125b500 r8 0xffffffff81a8edde witness_assert+0x1fe r9 0x5 r10 0xef2055248fcb9606 r11 0x8b52f619e67db0fb r12 0xffff80002468b0a0 r13 0xfffffd807140a540 r14 0 r15 0xffffffff81b25d00 uvn_flush+0x950 rip 0xffffffff817b9101 uvm_fault_lower+0xbb1 cs 0x8 rflags 0x10246 __ALIGN_SIZE+0xf246 rsp 0xffff80002468af00 ss 0 uvm_fault_lower+0xbb1: movq 0(%rbx),%rdi ddb{1}> show proc PROC (syz-executor.0) pid=87800 stat=onproc flags process=10 proc=0 pri=36, usrpri=86, nice=20 forw=0xffffffffffffffff, list=0xffff80002125aa80,0xffff80002125b7b0 process=0xffff80002125c440 user=0xffff800024686000, vmspace=0xfffffd807efff8a0 estcpu=36, cpticks=2, pctcpu=0.0 user=0, sys=1, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND * 904 87800 64755 32767 7 0x10 syz-executor.0 904 22821 64755 32767 3 0x4000090 fsleep syz-executor.0 904 320655 64755 32767 7 0x4000010 syz-executor.0 18581 239841 26056 32767 3 0x90 nanoslp syz-executor.1 18581 437007 26056 32767 3 0x4000090 fsleep syz-executor.1 18581 296239 26056 32767 3 0x4000090 fsleep syz-executor.1 18581 65933 26056 32767 3 0x4000090 fsleep syz-executor.1 26056 367489 23758 32767 3 0x90 nanoslp syz-executor.1 23758 170573 46598 0 3 0x82 wait syz-executor.1 64755 127528 86197 32767 3 0x90 nanoslp syz-executor.0 86197 135284 46598 0 3 0x82 wait syz-executor.0 97836 244047 0 0 3 0x14200 bored sosplice 46598 295188 95267 0 3 0x82 thrsleep syz-fuzzer 46598 370993 95267 0 3 0x4000082 nanoslp syz-fuzzer 46598 351878 95267 0 3 0x4000082 thrsleep syz-fuzzer 46598 463161 95267 0 3 0x4000082 thrsleep syz-fuzzer 46598 457467 95267 0 3 0x4000082 nanoslp syz-fuzzer 46598 390378 95267 0 3 0x4000082 kqread syz-fuzzer 46598 488260 95267 0 3 0x4000082 thrsleep syz-fuzzer 46598 397706 95267 0 3 0x4000082 thrsleep syz-fuzzer 95267 245121 64700 0 3 0x10008a sigsusp ksh 64700 275107 20004 0 3 0x9a kqread sshd 94379 92555 1 0 3 0x100083 ttyin getty 20004 459032 1 0 3 0x88 kqread sshd 60860 372039 16418 73 3 0x100090 kqread syslogd 16418 338311 1 0 3 0x100082 netio syslogd 62972 511885 1 0 3 0x100080 kqread resolvd 56665 477341 87340 77 3 0x100092 kqread dhcpleased 88306 337871 87340 77 3 0x100092 kqread dhcpleased 87340 331032 1 0 3 0x80 kqread dhcpleased 17268 261262 0 0 3 0x14200 bored smr 90198 201526 0 0 3 0x14200 pgzero zerothread 25338 467153 0 0 3 0x14200 aiodoned aiodoned 22995 118689 0 0 3 0x14200 syncer update 42513 352566 0 0 3 0x14200 cleaner cleaner 85381 426707 0 0 3 0x14200 reaper reaper 80855 492234 0 0 3 0x14200 pgdaemon pagedaemon 65027 504226 0 0 3 0x14200 bored viomb 49847 133334 0 0 3 0x40014200 acpi0 acpi0 79516 98309 0 0 3 0x40014200 idle1 18997 203282 0 0 3 0x14200 bored softnet 53065 422626 0 0 3 0x14200 bored systqmp 99469 424504 0 0 3 0x14200 bored systq 26653 502557 0 0 3 0x40014200 bored softclock 63707 192645 0 0 3 0x40014200 idle0 1 105761 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks Process 904 (syz-executor.0) thread 0xffff80002125b500 (87800) 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 904 (syz-executor.0) thread 0xffff80002125a7e0 (320655) exclusive rwlock amaplk r = 0 (0xfffffd80660c8be8) #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 10174 6397K 6416K 78643K 11437 0 pcb 13 12K 14K 78643K 17 0 rtable 112 3K 4K 78643K 4524 0 ifaddr 39 10K 10K 78643K 441 0 sysctl 3 1K 5K 78643K 47 0 counters 44 34K 34K 78643K 158 0 ioctlops 0 0K 2K 78643K 467 0 iov 0 0K 32K 78643K 4894 0 mount 1 1K 1K 78643K 1 0 log 0 0K 0K 78643K 4 0 vnodes 1209 76K 76K 78643K 11098 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 5K 78643K 418 0 VM map 2 1K 1K 78643K 2 0 sem 12 0K 0K 78643K 12518 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1697 195K 286K 78643K 12598 0 file desc 8 25K 33K 78643K 43443 0 sigio 0 0K 0K 78643K 322 0 proc 56 74K 99K 78643K 4179 0 subproc 26 1K 1K 78643K 767 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 ip_moptions 2 0K 0K 78643K 3896 0 in_multi 35 2K 2K 78643K 1131 0 ether_multi 2 0K 0K 78643K 169 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 361 1606K 1606K 78643K 361 0 exec 0 0K 2K 78643K 8973 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 295 38K 54K 78643K 572362 0 UVM aobj 131 4K 4K 78643K 139 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 0K 78643K 1325 0 NDP 5 0K 0K 78643K 180 0 temp 76 4195K 4307K 78643K 105577 0 kqueue 21 36K 48K 78643K 3140 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 5071 0 5068 73 72 1 5 0 8 0 rtentry 112 756 0 709 2 0 2 2 0 8 0 unpcb 128 32413 0 32400 310 306 4 9 0 8 3 syncache 296 374 0 374 97 96 1 1 0 8 1 sackhl 24 1 0 1 1 1 0 1 0 8 0 tcpqe 32 129 0 129 51 51 0 1 0 8 0 tcpcb 736 18620 0 18574 631 622 9 16 0 8 4 arp 120 141 0 134 1 0 1 1 0 8 0 ipq 40 123 0 122 33 32 1 1 0 8 0 ipqe 40 1106 0 1103 33 32 1 1 0 8 0 inpcb 304 37804 0 37729 601 591 10 14 0 8 4 rttmr 72 52 0 52 6 6 0 1 0 8 0 ip6q 72 207 0 207 23 23 0 1 0 8 0 ip6af 40 473 0 473 23 23 0 1 0 8 0 nd6 48 234 0 226 1 0 1 1 0 8 0 kcovpl 48 59 0 57 1 0 1 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 3357 0 3152 40 25 15 23 0 8 0 art_table 32 3358 0 3152 5 2 3 3 0 8 0 art_node 16 755 0 712 1 0 1 1 0 8 0 sysvmsgpl 40 8 0 5 2 1 1 1 0 8 0 semapl 112 12516 0 12506 1 0 1 1 0 8 0 shmpl 112 136 0 8 4 0 4 4 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 68331 0 66860 101 8 93 93 0 8 0 ffsino 272 68331 0 66860 99 0 99 99 0 8 0 nchpl 144 132324 0 130723 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 439902 0 439902 17 16 1 1 0 8 1 percpumem 16 91 0 57 1 0 1 1 0 8 0 scxspl 216 397721 0 397721 145 142 3 8 0 8 3 plimitpl 152 8364 0 8354 1 0 1 1 0 8 0 sigapl 424 43503 0 43469 4 0 4 4 0 8 0 futexpl 64 320613 0 320609 18 17 1 1 0 8 0 knotepl 112 717 0 0 6 2 4 4 0 8 0 kqueuepl 216 18050 0 18007 328 323 5 12 0 8 2 pipepl 336 10542 0 10532 405 398 7 11 0 8 6 fdescpl 496 43488 0 43469 4 1 3 3 0 8 0 filepl 152 323635 0 323466 606 594 12 15 0 8 5 lockfpl 104 6009 0 6006 3 2 1 2 0 8 0 lockfspl 48 1752 0 1749 1 0 1 1 0 8 0 sessionpl 144 74 0 64 1 0 1 1 0 8 0 pgrppl 48 411 0 401 1 0 1 1 0 8 0 ucredpl 96 56290 0 56278 1 0 1 1 0 8 0 zombiepl 144 43469 0 43469 1 0 1 1 0 8 1 processpl 1064 43503 0 43469 4 1 3 3 0 8 0 procpl 672 136633 0 136587 75 70 5 6 0 8 1 srpgc 96 5 0 5 2 2 0 1 0 8 0 sosppl 168 595 0 595 90 89 1 1 0 8 1 sockpl 480 76592 0 76502 1721 1709 12 34 0 8 0 mcl64k 65536 73 0 0 3 0 3 3 0 8 0 mcl16k 16384 35 0 0 4 1 3 3 0 8 0 mcl12k 12288 97 0 0 2 0 2 2 0 8 0 mcl9k 9216 57 0 0 2 0 2 2 0 8 0 mcl8k 8192 48 0 0 4 2 2 3 0 8 0 mcl4k 4096 73 0 0 5 2 3 3 0 8 0 mcl2k2 2112 30 0 0 2 0 2 2 0 8 0 mcl2k 2048 736 0 0 25 13 12 19 0 8 0 mtagpl 96 1 0 0 1 0 1 1 0 8 0 mbufpl 256 9946 0 0 566 3 563 563 0 8 0 bufpl 288 87789 0 81464 456 3 453 453 0 8 0 anonpl 24 13049918 0 13037068 1110 1007 103 109 0 186 19 amapchunkpl 152 1403283 0 1402673 344 309 35 38 0 158 11 amappl16 200 135199 0 134832 749 717 32 33 0 8 12 amappl15 192 11301 0 11293 1 0 1 1 0 8 0 amappl14 184 4753 0 4751 1 0 1 1 0 8 0 amappl13 176 6951 0 6950 1 0 1 1 0 8 0 amappl12 168 7224 0 7220 1 0 1 1 0 8 0 amappl11 160 7621 0 7606 1 0 1 1 0 8 0 amappl10 152 1208 0 1206 1 0 1 1 0 8 0 amappl9 144 3426 0 3424 1 0 1 1 0 8 0 amappl8 136 6647 0 6545 4 0 4 4 0 8 0 amappl7 128 5232 0 5222 1 0 1 1 0 8 0 amappl6 120 3509 0 3494 1 0 1 1 0 8 0 amappl5 112 28227 0 28206 1 0 1 1 0 8 0 amappl4 104 15570 0 15536 3 2 1 2 0 8 0 amappl3 96 15862 0 15845 1 0 1 1 0 8 0 amappl2 88 58832 0 58782 2 0 2 2 0 8 0 amappl1 80 760956 0 760500 12 2 10 12 0 8 0 amappl 88 569738 0 569559 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 72 138 0 8 3 0 3 3 0 8 0 uaddrrnd 24 43488 0 43469 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 43488 0 43469 1 0 1 1 0 8 0 vmmpekpl 168 344574 0 344553 2 0 2 2 0 8 0 vmmpepl 168 4046682 0 4044871 685 595 90 99 0 357 2 vmsppl 368 43487 0 43469 2 0 2 2 0 8 0 rwobjpl 56 1008959 0 1001716 291 185 106 106 0 8 3 pdppl 4096 86984 0 86938 91 45 46 50 0 8 0 pvpl 32 21224258 0 21207647 1786 1614 172 206 0 265 33 pmappl 248 43487 0 43469 2 0 2 2 0 8 0 extentpl 40 57 0 38 1 0 1 1 0 8 0 phpool 112 2456 0 1140 38 0 38 38 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+0x120 __mp_lock_spin sys/kern/kern_lock.c:117 [inline] __mp_lock(ffffffff828b6eb0) at __mp_lock+0x120 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 uvm_fault(fffffd807efff8a0,9f349f6e000,0,2) at uvm_fault+0x233 sys/uvm/uvm_fault.c:639 upageflttrap(ffff800024697140,9f349f6e5f8) at upageflttrap+0x82 sys/arch/amd64/amd64/trap.c:181 usertrap(ffff800024697140) 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+0x120 __mp_lock_spin sys/kern/kern_lock.c:117 [inline] __mp_lock(ffffffff828b6eb0) at __mp_lock+0x120 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 uvm_fault(fffffd807efff8a0,9f349f6e000,0,2) at uvm_fault+0x233 sys/uvm/uvm_fault.c:639 upageflttrap(ffff800024697140,9f349f6e5f8) at upageflttrap+0x82 sys/arch/amd64/amd64/trap.c:181 usertrap(ffff800024697140) 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(ffff80002468b0a0,ffff80002468b0d8,ffff80002468b020,0) 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(ffff80002468b210,20000080) at upageflttrap+0x82 sys/arch/amd64/amd64/trap.c:181 usertrap(ffff80002468b210) at usertrap+0x214 sys/arch/amd64/amd64/trap.c:403 recall_trap() at recall_trap+0x8 end of kernel end trace frame: 0x7f7ffffccd40, count: 10 ddb{1}> trace uvm_fault_lower(ffff80002468b0a0,ffff80002468b0d8,ffff80002468b020,0) 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(ffff80002468b210,20000080) at upageflttrap+0x82 sys/arch/amd64/amd64/trap.c:181 usertrap(ffff80002468b210) at usertrap+0x214 sys/arch/amd64/amd64/trap.c:403 recall_trap() at recall_trap+0x8 end of kernel end trace frame: 0x7f7ffffccd40, count: -5