uvm_fault(0xffffffff83a92ba0, 0xffff8000261b2000, 0, 2) -> d kernel: page fault trap, code=2 Stopped at memset+0x52: repe stosq %es:(%rdi) TID PID UID PRFLAGS PFLAGS CPU COMMAND *187070 79875 0 0x1000 0x4080000 0 syz-executor 283840 22152 0 0x2 0 1 syz-executor memset() at memset+0x52 VOP_WRITE(fffffd806800c518,ffff80002f78b498,7,fffffd80097fd618) at VOP_WRITE+0x101 sys/kern/vfs_vops.c:245 vn_write(fffffd806fffaaa0,ffff80002f78b498,0) at vn_write+0x1d3 sys/kern/vfs_vnops.c:414 dofilewritev(ffff800034fa87f0,6,ffff80002f78b498,0,ffff80002f78b550) at dofilewritev+0x2bd sys/kern/sys_generic.c:384 sys_write(ffff800034fa87f0,ffff80002f78b600,ffff80002f78b550) at sys_write+0xa2 sys/kern/sys_generic.c:300 syscall(ffff80002f78b600) at syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80002f78b600) at syscall+0xbd4 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x71909ce5750, count: 8 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(0xffffffff83a92ba0, 0xffff8000261b2000, 0, 2) -> d ddb{0}> trace memset() at memset+0x52 VOP_WRITE(fffffd806800c518,ffff80002f78b498,7,fffffd80097fd618) at VOP_WRITE+0x101 sys/kern/vfs_vops.c:245 vn_write(fffffd806fffaaa0,ffff80002f78b498,0) at vn_write+0x1d3 sys/kern/vfs_vnops.c:414 dofilewritev(ffff800034fa87f0,6,ffff80002f78b498,0,ffff80002f78b550) at dofilewritev+0x2bd sys/kern/sys_generic.c:384 sys_write(ffff800034fa87f0,ffff80002f78b600,ffff80002f78b550) at sys_write+0xa2 sys/kern/sys_generic.c:300 syscall(ffff80002f78b600) at syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80002f78b600) at syscall+0xbd4 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x71909ce5750, count: -7 ddb{0}> show registers rdi 0xffff8000261b2000 rsi 0 rbp 0xffff80002f78b2d0 rbx 0xe rdx 0 rcx 0x800 rax 0 r8 0x4000 __ALIGN_SIZE+0x3000 r9 0 r10 0x7beec263152d8b95 r11 0xffff8000261b2000 r12 0x4000 __ALIGN_SIZE+0x3000 r13 0x4000 __ALIGN_SIZE+0x3000 r14 0xffff8000261b2000 r15 0x4000 __ALIGN_SIZE+0x3000 rip 0xffffffff82fbdf72 memset+0x52 cs 0x8 rflags 0x10206 __ALIGN_SIZE+0xf206 rsp 0xffff80002f78b208 ss 0x10 memset+0x52: repe stosq %es:(%rdi) ddb{0}> show proc PROC (syz-executor) tid=187070 pid=79875 tcnt=2 stat=onproc flags process=1000 proc=4080000 runpri=17, usrpri=66, slppri=17, nice=20 wchan=0x0, wmesg=, ps_single=0xffff800034fa8d20 scnt=1 ecnt=0 forw=0xffffffffffffffff, list=0xffff800034fa8d20,0xffff8000fffee2c0 process=0xffff80003a7c49c0 user=0xffff80002f786000, vmspace=0xfffffd806e834010 estcpu=16, cpticks=14, pctcpu=0.8, user=0, sys=14, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 27504 273024 22152 0 2 0 syz-executor 27504 389142 22152 0 3 0x4000080 fsleep syz-executor 77221 35973 12886 0 2 0 syz-executor 77221 236838 12886 0 3 0x4000080 kqsel syz-executor 65967 312227 22153 0 2 0 syz-executor 65967 188484 22153 0 3 0x4000080 dtread syz-executor 65967 246842 22153 0 2 0x4000000 syz-executor 57667 475763 57267 0 2 0 syz-executor 57667 464864 57267 0 3 0x4000080 fifow syz-executor 3526 377011 0 0 3 0x14200 acct acct 96864 506798 15960 60929 2 0xc90 syz-executor 96864 420168 15960 60929 3 0x4000090 netcon syz-executor 96864 139020 15960 60929 3 0x4000090 netcon syz-executor 96864 403683 15960 60929 3 0x4000090 fsleep syz-executor 25345 43988 51538 0 2 0 syz-executor 25345 64147 51538 0 2 0x4000000 syz-executor 25345 61661 51538 0 2 0x4000000 syz-executor 79875 213165 72876 0 3 0x3000 suspend syz-executor *79875 187070 72876 0 7 0x4081000 syz-executor 15960 495723 89168 0 2 0x2 syz-executor 25238 95427 1 0 3 0x80 nanoslp init 57267 1024 89168 0 2 0xc82 syz-executor 22152 283840 89168 0 7 0x2 syz-executor 51538 444704 89168 0 2 0x2 syz-executor 35496 468178 89168 0 2 0xc82 syz-executor 22153 106241 89168 0 2 0xc82 syz-executor 12886 117993 89168 0 2 0xc82 syz-executor 72876 11698 89168 0 3 0x82 wait syz-executor 89168 206414 1 0 3 0x82 kqread syz-executor 14134 412124 0 0 3 0x14200 pause smr 64340 204774 0 0 3 0x14200 pgzero zerothread 68441 173034 0 0 3 0x14200 aiodoned aiodoned 97928 256094 0 0 3 0x14200 syncer update 97304 120086 0 0 3 0x14200 cleaner cleaner 7547 438431 0 0 3 0x14200 reaper reaper 95225 89053 0 0 3 0x14200 pgdaemon pagedaemon 30608 328486 0 0 3 0x14200 bored viomb 13588 69181 0 0 3 0x40014200 acpi0 acpi0 9020 265468 0 0 3 0x40014200 idle1 25055 407343 0 0 3 0x14200 bored softnet1 70890 254861 0 0 3 0x14200 bored softnet0 29910 407108 0 0 3 0x14200 smrbar systqmp 67324 398020 0 0 3 0x14200 bored systq 38620 348835 0 0 3 0x14200 tmoslp softclockmp 25365 59830 0 0 3 0x40014200 tmoslp softclock 81043 227190 0 0 3 0x40014200 idle0 1 255053 0 0 4 0x48000082 init 0 0 -1 0 3 0x10010200 scheduler swapper ddb{0}> show all locks Process 79875 (syz-executor) thread 0xffff800034fa87f0 (187070) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff83b1b740) #0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160 #1 __mp_acquire_count+0x58 sys/kern/kern_lock.c:-1 #2 sleep_finish+0x2d8 sys/kern/kern_synch.c:369 #3 biowait+0xc6 sys/kern/vfs_bio.c:1242 #4 bwrite+0x2e7 sys/kern/vfs_bio.c:754 #5 ffs2_balloc+0x18b4 sys/ufs/ffs/ffs_balloc.c:701 #6 ffs_write+0x4f9 sys/ufs/ffs/ffs_vnops.c:345 #7 VOP_WRITE+0x101 sys/kern/vfs_vops.c:245 #8 vn_write+0x1d3 sys/kern/vfs_vnops.c:414 #9 dofilewritev+0x2bd sys/kern/sys_generic.c:384 #10 sys_write+0xa2 sys/kern/sys_generic.c:300 #11 syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] #11 syscall+0xbd4 sys/arch/amd64/amd64/trap.c:783 #12 Xsyscall+0x128 exclusive rrwlock inode r = 0 (0xfffffd806ee2ca60) #0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160 #1 rw_do_enter_write+0x419 sys/kern/kern_rwlock.c:320 #2 rrw_enter+0xc6 sys/kern/kern_rwlock.c:621 #3 VOP_LOCK+0xbd sys/kern/vfs_vops.c:527 #4 vn_lock+0xa4 sys/kern/vfs_vnops.c:576 #5 vn_write+0x18f sys/kern/vfs_vnops.c:411 #6 dofilewritev+0x2bd sys/kern/sys_generic.c:384 #7 sys_write+0xa2 sys/kern/sys_generic.c:300 #8 syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] #8 syscall+0xbd4 sys/arch/amd64/amd64/trap.c:783 #9 Xsyscall+0x128 Process 29910 (systqmp) thread 0xffff8000ffffe7c8 (407108) shared rwlock systqmp r = 0 (0xffffffff839055f8) #0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160 #1 taskq_thread+0x12a sys/kern/kern_task.c:442 #2 proc_trampoline+0x10 ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 11106 12252K 12426K 166960K 13077 0 pcb 19 14K 20K 166960K 218 0 rtable 265 9K 9K 166960K 456 0 pf 41 19K 81K 166960K 118 0 ifaddr 44 7K 7K 166960K 64 0 ifgroup 60 2K 2K 166960K 91 0 sysctl 4 1K 9K 166960K 12 0 counters 72 37K 37K 166960K 108 0 ioctlops 0 0K 4K 166960K 1626 0 iov 0 0K 16K 166960K 27 0 mount 1 1K 1K 166960K 1 0 log 2 0K 0K 166960K 6 0 vnodes 1420 89K 90K 166960K 1959 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 5K 166960K 11 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 1K 166960K 29 0 dirhash 12 2K 2K 166960K 12 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 16 61K 97K 166960K 673 0 sigio 1 0K 0K 166960K 7 0 proc 12 17K 164K 166960K 643 0 subproc 72 4K 4K 166960K 82 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 124 0 in_multi 99 7K 7K 166960K 150 0 ether_multi 1 0K 0K 166960K 4 0 mrt 0 0K 0K 166960K 22 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 223 996K 996K 166960K 223 0 exec 0 0K 1K 166960K 507 0 fusefs mount 1 32K 32K 166960K 1 0 tdb 3 0K 0K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 140 78K 174K 166960K 8053 0 UVM aobj 16 2K 2K 166960K 18 0 pinsyscall 18 36K 106K 166960K 1900 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 14 0 NDP 13 0K 2K 166960K 44 0 temp 54 9118K 9228K 166960K 34876 0 kqueue 3 6K 29K 166960K 157 0 SYN cache 2 16K 16K 166960K 2 0 ddb{0}> show all pools Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle plcache 128 26 0 0 1 0 1 1 0 8 0 rtpcb 120 170 0 170 2 0 2 2 0 8 2 rtentry 176 134 0 19 6 0 6 6 0 8 0 unpcb 144 279 0 277 3 0 3 3 0 8 2 syncache 336 8 0 8 1 0 1 1 0 8 1 tcpcb 736 241 0 237 7 3 4 7 0 8 3 arp 136 20 0 2 1 0 1 1 0 8 0 ipq 40 1 0 1 1 0 1 1 0 8 1 ipqe 40 3 0 3 1 0 1 1 0 8 1 inpcb 328 780 0 773 7 1 6 7 0 8 4 nd6 152 36 0 9 2 0 2 2 0 8 0 pkpcb 40 3 0 3 1 0 1 1 0 8 1 kcovpl 48 9 0 1 1 0 1 1 0 8 0 ppxss 1192 17 0 17 1 0 1 1 0 8 1 pfstscr 40 7 0 3 1 0 1 1 0 8 0 pffrag 232 7 0 1 1 0 1 1 0 482 0 pffrnode 88 6 0 0 1 0 1 1 0 8 0 pffrent 40 11 0 5 1 0 1 1 0 8 0 pfosfp 40 1428 0 1005 5 0 5 5 0 8 0 pfosfpen 112 1428 0 714 21 0 21 21 0 8 0 pfsrclim 320 2 0 1 1 0 1 1 0 8 0 pfanchor 1288 4 0 0 1 0 1 1 0 8 0 pftag 88 1 0 0 1 0 1 1 0 8 0 pfstitem 24 70 0 4 1 0 1 1 0 8 0 pfstkey 128 74 0 6 3 0 3 3 0 8 0 pfstate 448 69 0 5 8 0 8 8 0 8 0 pfrule 1360 34 0 28 2 1 1 2 0 8 0 art_heap8 4096 2 0 0 2 0 2 2 0 8 0 art_heap4 256 618 0 112 33 0 33 33 0 8 0 art_table 40 620 0 112 6 0 6 6 0 8 0 art_node 32 134 0 28 1 0 1 1 0 8 0 sysvmsgpl 40 11 0 4 1 0 1 1 0 8 0 semupl 112 1 0 1 1 0 1 1 0 8 1 semapl 72 25 0 15 1 0 1 1 0 8 0 shmpl 112 15 0 2 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 2534 0 1060 93 0 93 93 0 8 0 ffsino 296 2534 0 1060 114 0 114 114 0 8 0 nchpl 144 3488 0 1772 64 0 64 64 0 8 0 rtmask 32 4 0 4 1 0 1 1 0 8 1 vnodes 216 3050 0 0 170 0 170 170 0 8 0 namei 1024 12428 0 12428 2 0 2 2 0 8 2 percpumem 16 69 0 18 1 0 1 1 0 8 0 kstatmem 264 55 0 26 3 0 3 3 0 8 0 scsiplug 72 1 0 1 1 1 0 1 0 8 0 scxspl 216 15052 0 15052 5 3 2 3 1 8 2 plimitpl 152 205 0 195 1 0 1 1 0 8 0 sigapl 424 1004 0 967 7 1 6 7 0 8 1 knotepl 120 577 0 0 18 0 18 18 0 8 0 kqueuepl 224 316 0 312 3 2 1 3 0 8 0 pipepl 344 235 0 208 9 0 9 9 0 8 6 fdescpl 528 986 0 967 3 0 3 3 0 8 0 filepl 160 5955 0 5786 15 2 13 15 0 8 4 lockfpl 104 266 0 265 1 0 1 1 0 8 0 lockfspl 48 86 0 85 1 0 1 1 0 8 0 sessionpl 144 51 0 49 1 0 1 1 0 8 0 pgrppl 48 63 0 53 1 0 1 1 0 8 0 ucredpl 104 814 0 810 1 0 1 1 0 8 0 zombiepl 144 969 0 967 1 0 1 1 0 8 0 processpl 1232 1004 0 967 5 0 5 5 0 8 0 procpl 664 1922 0 1874 6 1 5 6 0 8 0 sosppl 176 1 0 1 1 1 0 1 0 8 0 sockpl 752 1290 0 1281 11 3 8 11 0 8 6 mcl64k 65536 4 0 0 1 0 1 1 0 8 0 mcl16k 16384 2 0 0 1 0 1 1 0 8 0 mcl12k 12288 2 0 0 1 0 1 1 0 8 0 mcl8k 8192 6 0 0 1 0 1 1 0 8 0 mcl4k 4096 126 0 0 16 0 16 16 0 8 0 mcl2k 2048 26 0 0 4 0 4 4 0 8 0 mtagpl 96 7 0 0 1 0 1 1 0 8 0 mbufpl 256 206 0 0 13 0 13 13 0 8 0 bufpl 280 6516 0 385 439 0 439 439 0 8 0 anonpl 32 6202 0 0 50 0 50 50 0 246 0 amapchunkpl 152 26015 0 25632 30 4 26 30 0 158 10 amappl16 200 2337 0 2088 20 3 17 17 0 8 0 amappl15 192 3 0 3 1 1 0 1 0 8 0 amappl14 184 455 0 454 1 0 1 1 0 8 0 amappl13 176 132 0 132 1 0 1 1 0 8 1 amappl12 168 1244 0 1226 2 0 2 2 0 8 0 amappl11 160 6 0 6 1 1 0 1 0 8 0 amappl10 152 65 0 65 1 0 1 1 0 8 1 amappl9 144 282 0 282 1 1 0 1 0 8 0 amappl8 136 107 0 107 1 0 1 1 0 8 1 amappl7 128 171 0 169 1 0 1 1 0 8 0 amappl6 120 166 0 166 1 0 1 1 0 8 1 amappl5 112 110 0 109 1 0 1 1 0 8 0 amappl4 104 308 0 305 1 0 1 1 0 8 0 amappl3 96 5096 0 5013 4 0 4 4 0 8 1 amappl2 88 572 0 562 2 0 2 2 0 8 0 amappl1 80 12895 0 12798 15 2 13 15 0 8 5 amappl 88 7120 0 6992 5 1 4 5 0 92 0 uvmvnodes 80 118 0 0 3 0 3 3 0 8 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 7 0 7 2 1 1 1 0 8 1 dma128 128 254 0 254 2 2 0 1 0 8 0 dma64 64 6 0 6 1 1 0 1 0 8 0 dma32 32 8 0 8 2 2 0 1 0 8 0 dma16 16 18 0 17 1 0 1 1 0 8 0 aobjpl 72 17 0 2 1 0 1 1 0 8 0 uaddrrnd 24 986 0 966 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 986 0 966 1 0 1 1 0 8 0 vmmpekpl 168 9978 0 9940 2 0 2 2 0 8 0 vmmpepl 168 69575 0 68476 86 4 82 86 0 357 31 vmsppl 488 985 0 966 5 1 4 5 0 8 1 rwobjpl 80 21045 0 20397 24 2 22 24 0 8 1 pdppl 4096 1979 0 1932 107 60 47 87 0 8 0 pvpl 32 13940 0 0 113 0 113 113 0 265 0 pmappl 256 985 0 966 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 301 0 66 8 0 8 8 0 8 0 ddb{0}> machine ddbcpu 0 Invalid cpu 0 ddb{0}>