uvm_fault(0xfffffd807efffb80, 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 *151791 42962 32767 0x10 0 1K syz-executor.0 359951 42962 32767 0x10 0x4000000 0 syz-executor.0 uvm_fault_lower(ffff800021250c60,ffff800021250c98,ffff800021250be0,0) at uvm_fault_lower+0xbb1 sys/uvm/uvm_fault.c:1325 uvm_fault(fffffd807efffb80,20000000,0,2) at uvm_fault+0x24f sys/uvm/uvm_fault.c:640 upageflttrap(ffff800021250dd0,20000000) at upageflttrap+0x82 sys/arch/amd64/amd64/trap.c:181 usertrap(ffff800021250dd0) at usertrap+0x214 sys/arch/amd64/amd64/trap.c:403 recall_trap() at recall_trap+0x8 end of kernel end trace frame: 0x7f7ffffbd730, 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(0xfffffd807efffb80, 0x0, 0, 1) -> e ddb{1}> trace uvm_fault_lower(ffff800021250c60,ffff800021250c98,ffff800021250be0,0) at uvm_fault_lower+0xbb1 sys/uvm/uvm_fault.c:1325 uvm_fault(fffffd807efffb80,20000000,0,2) at uvm_fault+0x24f sys/uvm/uvm_fault.c:640 upageflttrap(ffff800021250dd0,20000000) at upageflttrap+0x82 sys/arch/amd64/amd64/trap.c:181 usertrap(ffff800021250dd0) at usertrap+0x214 sys/arch/amd64/amd64/trap.c:403 recall_trap() at recall_trap+0x8 end of kernel end trace frame: 0x7f7ffffbd730, count: -5 ddb{1}> show registers rdi 0 rsi 0 rbp 0xffff800021250b50 rbx 0 rdx 0 rcx 0x8 rax 0xffff80002125aa80 r8 0xffffffff81a8edde witness_assert+0x1fe r9 0x5 r10 0x6eb0791fe2a018cc r11 0xd6be9507543cc2c r12 0xffff800021250c60 r13 0xfffffd806f88f660 r14 0 r15 0x800 rip 0xffffffff817b9101 uvm_fault_lower+0xbb1 cs 0x8 rflags 0x10246 __ALIGN_SIZE+0xf246 rsp 0xffff800021250ac0 ss 0 uvm_fault_lower+0xbb1: movq 0(%rbx),%rdi ddb{1}> show proc PROC (syz-executor.0) pid=151791 stat=onproc flags process=10 proc=0 pri=32, usrpri=86, nice=20 forw=0xffffffffffffffff, list=0xffff80002125ad20,0xffff80002125ba50 process=0xffff80002125c868 user=0xffff80002124b000, vmspace=0xfffffd807efffb80 estcpu=36, cpticks=1, pctcpu=0.0 user=0, sys=0, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND *42962 151791 53923 32767 7 0x10 syz-executor.0 42962 489767 53923 32767 3 0x4000090 fsleep syz-executor.0 42962 93902 53923 32767 3 0x4000090 fsleep syz-executor.0 42962 359951 53923 32767 7 0x4000010 syz-executor.0 3255 42803 70114 32767 3 0x90 nanoslp syz-executor.1 3255 176162 70114 32767 3 0x4000090 netio syz-executor.1 3255 268207 70114 32767 3 0x4000090 fsleep syz-executor.1 70114 497380 83997 32767 3 0x90 nanoslp syz-executor.1 83997 462331 11919 0 3 0x82 wait syz-executor.1 53923 116483 66731 32767 3 0x90 nanoslp syz-executor.0 66731 201313 11919 0 3 0x82 wait syz-executor.0 75738 436488 0 0 3 0x14200 bored sosplice 11919 441340 68042 0 3 0x82 thrsleep syz-fuzzer 11919 501190 68042 0 3 0x4000082 nanoslp syz-fuzzer 11919 192028 68042 0 3 0x4000082 kqread syz-fuzzer 11919 150292 68042 0 3 0x4000082 thrsleep syz-fuzzer 11919 194619 68042 0 3 0x4000082 thrsleep syz-fuzzer 11919 162088 68042 0 3 0x4000082 thrsleep syz-fuzzer 11919 259258 68042 0 3 0x4000082 thrsleep syz-fuzzer 11919 268228 68042 0 3 0x4000082 thrsleep syz-fuzzer 68042 184459 767 0 3 0x10008a sigsusp ksh 767 353653 1575 0 3 0x9a kqread sshd 51308 494474 1 0 3 0x100083 ttyin getty 1575 207673 1 0 3 0x88 kqread sshd 73883 489705 26979 73 3 0x100090 kqread syslogd 26979 501079 1 0 3 0x100082 netio syslogd 32005 196012 1 0 3 0x100080 kqread resolvd 32609 495347 13602 77 3 0x100092 kqread dhcpleased 1043 503710 13602 77 3 0x100092 kqread dhcpleased 13602 407685 1 0 3 0x80 kqread dhcpleased 85377 162755 0 0 3 0x14200 bored smr 86063 484399 0 0 3 0x14200 pgzero zerothread 39459 147130 0 0 3 0x14200 aiodoned aiodoned 99095 473555 0 0 3 0x14200 syncer update 73964 514488 0 0 3 0x14200 cleaner cleaner 56513 129848 0 0 3 0x14200 reaper reaper 25689 1431 0 0 3 0x14200 pgdaemon pagedaemon 44436 272783 0 0 3 0x14200 bored viomb 43528 178520 0 0 3 0x40014200 acpi0 acpi0 1898 408008 0 0 3 0x40014200 idle1 23813 251983 0 0 3 0x14200 bored softnet 40089 406644 0 0 3 0x14200 bored systqmp 23864 302711 0 0 3 0x14200 bored systq 39272 377690 0 0 3 0x40014200 bored softclock 46353 24410 0 0 3 0x40014200 idle0 1 249871 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks Process 42962 (syz-executor.0) thread 0xffff80002125aa80 (151791) 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{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10155 6395K 6416K 78643K 11361 0 pcb 13 12K 14K 78643K 17 0 rtable 106 3K 4K 78643K 3449 0 ifaddr 39 10K 10K 78643K 308 0 sysctl 3 1K 3K 78643K 75 0 counters 44 34K 34K 78643K 120 0 ioctlops 0 0K 2K 78643K 3245 0 iov 0 0K 28K 78643K 4518 0 mount 1 1K 1K 78643K 1 0 log 0 0K 0K 78643K 5 0 vnodes 1209 76K 76K 78643K 8438 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 9K 78643K 369 0 VM map 2 1K 1K 78643K 2 0 sem 12 0K 0K 78643K 15884 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1697 195K 286K 78643K 12598 0 file desc 8 25K 33K 78643K 39301 0 sigio 0 0K 0K 78643K 638 0 proc 56 74K 99K 78643K 3274 0 subproc 26 1K 1K 78643K 520 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 ip_moptions 0 0K 0K 78643K 3647 0 in_multi 33 2K 2K 78643K 995 0 ether_multi 1 0K 0K 78643K 152 0 mrt 1 0K 0K 78643K 7 0 ISOFS mount 1 32K 32K 78643K 1 0 MSDOSFS mount 1 16K 16K 78643K 1 0 ttys 247 1102K 1102K 78643K 247 0 exec 0 0K 2K 78643K 5951 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 330 38K 55K 78643K 520921 0 UVM aobj 131 4K 4K 78643K 138 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 0K 78643K 983 0 NDP 5 0K 0K 78643K 123 0 temp 76 4195K 4323K 78643K 92873 0 kqueue 18 30K 40K 78643K 2386 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 3139 0 3136 43 42 1 3 0 8 0 rtentry 112 519 0 475 2 0 2 2 0 8 0 unpcb 128 27318 0 27305 242 241 1 9 0 8 0 syncache 296 386 0 386 97 97 0 1 0 8 0 sackhl 24 1 0 1 1 1 0 1 0 8 0 tcpqe 32 124 0 124 52 52 0 1 0 8 0 tcpcb 736 18276 0 18268 572 566 6 15 0 8 5 arp 120 91 0 85 1 0 1 1 0 8 0 ipq 40 112 0 111 28 27 1 1 0 8 0 ipqe 40 1116 0 1115 28 27 1 1 0 8 0 inpcb 304 72102 0 72092 688 677 11 16 0 8 10 rttmr 72 8 0 8 2 2 0 1 0 8 0 ip6q 72 80 0 80 17 17 0 1 0 8 0 ip6af 40 150 0 150 17 17 0 1 0 8 0 nd6 48 165 0 159 1 0 1 1 0 8 0 kcovpl 48 40 0 38 1 0 1 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 2287 0 2096 33 20 13 20 0 8 1 art_table 32 2288 0 2096 4 2 2 3 0 8 0 art_node 16 518 0 478 1 0 1 1 0 8 0 sysvmsgpl 40 23 0 0 1 0 1 1 0 8 0 semapl 112 15882 0 15872 1 0 1 1 0 8 0 shmpl 112 135 0 7 4 0 4 4 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 52797 0 51373 92 2 90 90 0 8 0 ffsino 272 52797 0 51373 96 0 96 96 0 8 0 nchpl 144 103429 0 101828 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 336489 0 336489 18 17 1 1 0 8 1 percpumem 16 72 0 38 1 0 1 1 0 8 0 scxspl 216 337962 0 337962 156 155 1 8 0 8 1 plimitpl 152 8321 0 8310 1 0 1 1 0 8 0 sigapl 424 39409 0 39375 4 0 4 4 0 8 0 futexpl 64 276649 0 276645 23 22 1 1 0 8 0 knotepl 112 536 0 0 4 0 4 4 0 8 0 kqueuepl 216 13646 0 13613 272 269 3 9 0 8 1 pipepl 336 8191 0 8180 294 292 2 11 0 8 0 fdescpl 496 39394 0 39375 4 1 3 3 0 8 0 filepl 152 280952 0 280841 551 541 10 19 0 8 5 lockfpl 104 5348 0 5345 3 2 1 2 0 8 0 lockfspl 48 1479 0 1476 1 0 1 1 0 8 0 sessionpl 144 55 0 45 1 0 1 1 0 8 0 pgrppl 48 2984 0 2974 1 0 1 1 0 8 0 ucredpl 96 45346 0 45334 1 0 1 1 0 8 0 zombiepl 144 39375 0 39375 2 1 1 1 0 8 1 processpl 1064 39409 0 39375 4 1 3 3 0 8 0 procpl 672 124461 0 124415 76 71 5 6 0 8 1 srpgc 96 2 0 2 2 2 0 1 0 8 0 sosppl 168 539 0 539 90 89 1 1 0 8 1 sockpl 480 104031 0 104005 1723 1703 20 34 0 8 16 mcl64k 65536 80 0 0 3 0 3 3 0 8 0 mcl16k 16384 42 0 0 4 1 3 3 0 8 0 mcl12k 12288 66 0 0 2 0 2 2 0 8 0 mcl9k 9216 65 0 0 3 1 2 2 0 8 0 mcl8k 8192 41 0 0 5 2 3 3 0 8 0 mcl4k 4096 86 0 0 4 2 2 3 0 8 0 mcl2k2 2112 19 0 0 2 0 2 2 0 8 0 mcl2k 2048 673 0 0 25 16 9 19 0 8 0 mtagpl 96 3 0 0 1 0 1 1 0 8 0 mbufpl 256 8778 0 0 437 23 414 414 0 8 0 bufpl 288 91705 0 85380 456 3 453 453 0 8 0 anonpl 24 12161470 0 12148484 775 682 93 107 0 186 0 amapchunkpl 152 1324696 0 1324103 419 395 24 48 0 158 1 amappl16 200 131120 0 130745 761 739 22 35 0 8 1 amappl15 192 11720 0 11713 1 0 1 1 0 8 0 amappl14 184 9714 0 9711 1 0 1 1 0 8 0 amappl13 176 5033 0 5031 1 0 1 1 0 8 0 amappl12 168 62 0 58 1 0 1 1 0 8 0 amappl11 160 10533 0 10517 1 0 1 1 0 8 0 amappl10 152 5859 0 5854 1 0 1 1 0 8 0 amappl9 144 2653 0 2649 1 0 1 1 0 8 0 amappl8 136 2224 0 2075 6 0 6 6 0 8 0 amappl7 128 834 0 826 1 0 1 1 0 8 0 amappl6 120 2609 0 2592 1 0 1 1 0 8 0 amappl5 112 34013 0 33996 1 0 1 1 0 8 0 amappl4 104 23364 0 23329 3 2 1 2 0 8 0 amappl3 96 4034 0 4017 1 0 1 1 0 8 0 amappl2 88 46332 0 46285 12 10 2 2 0 8 0 amappl1 80 703598 0 703147 12 2 10 12 0 8 0 amappl 88 518509 0 518327 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 72 137 0 7 3 0 3 3 0 8 0 uaddrrnd 24 39394 0 39375 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 39394 0 39375 1 0 1 1 0 8 0 vmmpekpl 168 301574 0 301547 2 0 2 2 0 8 0 vmmpepl 168 3682106 0 3680235 714 618 96 106 0 357 7 vmsppl 368 39393 0 39375 2 0 2 2 0 8 0 rwobjpl 56 934557 0 927271 151 46 105 107 0 8 0 pdppl 4096 78796 0 78750 78 32 46 50 0 8 0 pvpl 32 19702382 0 19685533 1399 1254 145 205 0 265 0 pmappl 248 39393 0 39375 2 0 2 2 0 8 0 extentpl 40 57 0 38 1 0 1 1 0 8 0 phpool 112 2126 0 978 34 0 34 34 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 sleep_setup(ffff8000244a8ff0,ffff80002125a2a0,120,ffffffff824481fc,0) at sleep_setup+0xd3 sys/kern/kern_synch.c:370 rwsleep(ffff80002125a2a0,ffffffff827bb490,120,ffffffff824481fc,0) at rwsleep+0xc1 sys/kern/kern_synch.c:311 futex_wait(5949ae70220,2,0,2) at futex_wait+0x13c sys/kern/sys_futex.c:260 sys_futex(ffff80002125a2a0,ffff8000244a9180,ffff8000244a91e0) at sys_futex+0xf8 sys/kern/sys_futex.c:111 syscall(ffff8000244a9250) at syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff8000244a9250) at syscall+0x489 sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x594b29e65d0, count: 2 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 sleep_setup(ffff8000244a8ff0,ffff80002125a2a0,120,ffffffff824481fc,0) at sleep_setup+0xd3 sys/kern/kern_synch.c:370 rwsleep(ffff80002125a2a0,ffffffff827bb490,120,ffffffff824481fc,0) at rwsleep+0xc1 sys/kern/kern_synch.c:311 futex_wait(5949ae70220,2,0,2) at futex_wait+0x13c sys/kern/sys_futex.c:260 sys_futex(ffff80002125a2a0,ffff8000244a9180,ffff8000244a91e0) at sys_futex+0xf8 sys/kern/sys_futex.c:111 syscall(ffff8000244a9250) at syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff8000244a9250) at syscall+0x489 sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x594b29e65d0, count: -13 ddb{0}> machine ddbcpu 1 Stopped at uvm_fault_lower+0xbb1: movq 0(%rbx),%rdi uvm_fault_lower(ffff800021250c60,ffff800021250c98,ffff800021250be0,0) at uvm_fault_lower+0xbb1 sys/uvm/uvm_fault.c:1325 uvm_fault(fffffd807efffb80,20000000,0,2) at uvm_fault+0x24f sys/uvm/uvm_fault.c:640 upageflttrap(ffff800021250dd0,20000000) at upageflttrap+0x82 sys/arch/amd64/amd64/trap.c:181 usertrap(ffff800021250dd0) at usertrap+0x214 sys/arch/amd64/amd64/trap.c:403 recall_trap() at recall_trap+0x8 end of kernel end trace frame: 0x7f7ffffbd730, count: 10 ddb{1}> trace uvm_fault_lower(ffff800021250c60,ffff800021250c98,ffff800021250be0,0) at uvm_fault_lower+0xbb1 sys/uvm/uvm_fault.c:1325 uvm_fault(fffffd807efffb80,20000000,0,2) at uvm_fault+0x24f sys/uvm/uvm_fault.c:640 upageflttrap(ffff800021250dd0,20000000) at upageflttrap+0x82 sys/arch/amd64/amd64/trap.c:181 usertrap(ffff800021250dd0) at usertrap+0x214 sys/arch/amd64/amd64/trap.c:403 recall_trap() at recall_trap+0x8 end of kernel end trace frame: 0x7f7ffffbd730, count: -5