uvm_fault(0xffffffff838fce98, 0xffff8000259a2000, 0, 2) -> d kernel: page fault trap, code=2 Stopped at memset+0x52: repe stosq %es:(%rdi) TID PID UID PRFLAGS PFLAGS CPU COMMAND * 80995 93054 0 0x2000 0x4080000 0K syz-executor 412561 68290 0 0x2 0 1 syz-executor memset() at memset+0x52 VOP_WRITE(fffffd806b1cf378,ffff80002a2be508,7,fffffd80097fb4e0) at VOP_WRITE+0x101 sys/kern/vfs_vops.c:245 vn_write(fffffd80600c0450,ffff80002a2be508,0) at vn_write+0x1d3 sys/kern/vfs_vnops.c:408 dofilewritev(ffff8000fffe02c8,6,ffff80002a2be508,0,ffff80002a2be5c0) at dofilewritev+0x242 sys/kern/sys_generic.c:380 sys_write(ffff8000fffe02c8,ffff80002a2be670,ffff80002a2be5c0) at sys_write+0xa2 sys/kern/sys_generic.c:300 syscall(ffff80002a2be670) at syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80002a2be670) at syscall+0xbd4 sys/arch/amd64/amd64/trap.c:746 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xf69adfdbf40, 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(0xffffffff838fce98, 0xffff8000259a2000, 0, 2) -> d ddb{0}> trace memset() at memset+0x52 VOP_WRITE(fffffd806b1cf378,ffff80002a2be508,7,fffffd80097fb4e0) at VOP_WRITE+0x101 sys/kern/vfs_vops.c:245 vn_write(fffffd80600c0450,ffff80002a2be508,0) at vn_write+0x1d3 sys/kern/vfs_vnops.c:408 dofilewritev(ffff8000fffe02c8,6,ffff80002a2be508,0,ffff80002a2be5c0) at dofilewritev+0x242 sys/kern/sys_generic.c:380 sys_write(ffff8000fffe02c8,ffff80002a2be670,ffff80002a2be5c0) at sys_write+0xa2 sys/kern/sys_generic.c:300 syscall(ffff80002a2be670) at syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80002a2be670) at syscall+0xbd4 sys/arch/amd64/amd64/trap.c:746 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xf69adfdbf40, count: -7 ddb{0}> show registers rdi 0xffff8000259a2000 rsi 0 rbp 0xffff80002a2be340 rbx 0xe rdx 0 rcx 0x800 rax 0 r8 0x4000 __ALIGN_SIZE+0x3000 r9 0 r10 0xbc0016a4df52750d r11 0xffff8000259a2000 r12 0x4000 __ALIGN_SIZE+0x3000 r13 0x4000 __ALIGN_SIZE+0x3000 r14 0xffff8000259a2000 r15 0x4000 __ALIGN_SIZE+0x3000 rip 0xffffffff814817b2 memset+0x52 cs 0x8 rflags 0x10206 __ALIGN_SIZE+0xf206 rsp 0xffff80002a2be278 ss 0x10 memset+0x52: repe stosq %es:(%rdi) ddb{0}> show proc PROC (syz-executor) tid=80995 pid=93054 tcnt=5 stat=onproc flags process=2000 proc=4080000 runpri=17, usrpri=85, slppri=17, nice=20 wchan=0x0, wmesg=, ps_single=0xffff8000fffe0a90 scnt=2 ecnt=0 forw=0xffffffffffffffff, list=0xffff8000fffe14f0,0xffff8000fffe8d28 process=0xffff8000fffdc028 user=0xffff80002a2b9000, vmspace=0xfffffd806b7c2208 estcpu=35, cpticks=12, pctcpu=0.1, user=0, sys=12, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 5986 141876 68290 0 2 0 syz-executor 5986 155927 68290 0 2 0x4000000 syz-executor 81274 250275 57174 0 2 0xc80 syz-executor 81274 213795 57174 0 3 0x4000080 kqsel syz-executor 81274 33643 57174 0 3 0x4000080 fsleep syz-executor 78882 209683 69507 0 2 0xc80 syz-executor 78882 376415 69507 0 3 0x4000080 fifow syz-executor 78882 367692 69507 0 3 0x4000080 fsleep syz-executor 26184 50100 21058 0 2 0 syz-executor 26184 384984 21058 0 3 0x4000080 sbwait syz-executor 26184 367231 21058 0 3 0x4000080 fsleep syz-executor 90896 452316 75296 60928 2 0x10 syz-executor 90896 52774 75296 60928 3 0x4000090 piperd syz-executor 90896 384973 75296 60928 3 0x4000090 fsleep syz-executor 93054 487272 94272 0 4 0x82000 syz-executor *93054 80995 94272 0 7 0x4082000 syz-executor 93054 459730 94272 0 2 0x4082c00 syz-executor 93054 516987 94272 0 4 0x4082000 syz-executor 93054 68646 94272 0 3 0x4002000 suspend syz-executor 57174 257489 4162 0 2 0xc82 syz-executor 46567 292657 0 0 3 0x14200 acct acct 75296 105398 4162 0 2 0xc82 syz-executor 94272 347763 4162 0 2 0xc82 syz-executor 81443 110634 4162 0 2 0xc82 syz-executor 26040 309907 1 0 3 0x100083 ttyopn getty 68565 103647 0 0 3 0x14200 bored sosplice 69507 52250 4162 0 2 0xc82 syz-executor 58945 2848 4162 0 3 0x82 wait syz-executor 68290 412561 4162 0 7 0x2 syz-executor 21058 128905 4162 0 2 0x2 syz-executor 4162 243804 54537 0 3 0x82 kqread syz-executor 54537 330924 77016 0 3 0x10008a sigsusp ksh 77016 356798 61693 0 3 0x98 kqread sshd-session 61693 293889 97667 0 3 0x92 kqread sshd-session 97667 76730 1 0 3 0x88 kqread sshd 52545 483634 10880 74 3 0x1100092 bpf pflogd 10880 313046 1 0 3 0x80 sbwait pflogd 45505 429453 7302 73 3 0x1100090 kqread syslogd 7302 213438 1 0 3 0x100082 sbwait syslogd 29163 459667 1 0 3 0x100080 kqread resolvd 70407 56663 81935 77 3 0x100092 kqread dhcpleased 96 7206 81935 77 3 0x100092 kqread dhcpleased 81935 490346 1 0 3 0x80 kqread dhcpleased 1184 93406 0 0 3 0x14200 bored smr 1917 439317 0 0 3 0x14200 pgzero zerothread 75035 156531 0 0 3 0x14200 aiodoned aiodoned 85786 503135 0 0 3 0x14200 syncer update 62402 495531 0 0 3 0x14200 cleaner cleaner 64792 106848 0 0 3 0x14200 reaper reaper 34122 143130 0 0 3 0x14200 pgdaemon pagedaemon 89136 139632 0 0 3 0x14200 bored viomb 80885 516735 0 0 3 0x40014200 acpi0 acpi0 74181 256695 0 0 3 0x40014200 idle1 18171 134776 0 0 3 0x14200 bored softnet1 25748 160296 0 0 3 0x14200 bored softnet0 43464 212588 0 0 3 0x14200 bored systqmp 69366 364609 0 0 3 0x14200 bored systq 67642 220383 0 0 3 0x14200 tmoslp softclockmp 72956 12757 0 0 3 0x40014200 tmoslp softclock 42117 271515 0 0 3 0x40014200 idle0 1 459374 0 0 3 0x82 wait init 0 0 -1 0 3 0x10010200 scheduler swapper ddb{0}> show all locks Process 93054 (syz-executor) thread 0xffff8000fffe02c8 (80995) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff838f9630) #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:367 #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:408 #9 dofilewritev+0x242 sys/kern/sys_generic.c:380 #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:746 #12 Xsyscall+0x128 exclusive rrwlock inode r = 0 (0xfffffd805cfc96b0) #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+0xa3 sys/kern/vfs_vops.c:527 #4 vn_lock+0xa4 sys/kern/vfs_vnops.c:570 #5 vn_write+0x18f sys/kern/vfs_vnops.c:405 #6 dofilewritev+0x242 sys/kern/sys_generic.c:380 #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:746 #9 Xsyscall+0x128 ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10233 11047K 12725K 166960K 14421 0 pcb 19 16K 18K 166960K 547 0 rtable 199 10K 10K 166960K 643 0 pf 35 17K 80K 166960K 262 0 ifaddr 38 7K 8K 166960K 154 0 ifgroup 55 2K 2K 166960K 246 0 sysctl 4 1K 9K 166960K 19 0 counters 68 36K 37K 166960K 370 0 ioctlops 0 0K 4K 166960K 1960 0 iov 0 0K 28K 166960K 268 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1520 95K 96K 166960K 3479 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 3 5K 9K 166960K 37 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 0K 166960K 108 0 dirhash 12 2K 2K 166960K 69 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 18 65K 244K 166960K 2136 0 sigio 0 0K 0K 166960K 93 0 proc 72 115K 180K 166960K 923 0 subproc 72 4K 4K 166960K 138 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 290 0 in_multi 78 5K 7K 166960K 275 0 ether_multi 1 0K 0K 166960K 25 0 mrt 2 0K 0K 166960K 14 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 229 1023K 1023K 166960K 229 0 exec 0 0K 1K 166960K 723 0 fusefs mount 1 32K 32K 166960K 1 0 pfkey data 0 0K 0K 166960K 3 0 tdb 3 0K 0K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 259 154K 169K 166960K 20444 0 UVM aobj 39 4K 4K 166960K 44 0 pinsyscall 43 86K 105K 166960K 3377 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 134 0 NDP 12 0K 1K 166960K 105 0 temp 80 8652K 8895K 166960K 80012 0 kqueue 14 22K 30K 166960K 388 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 120 293 0 290 3 0 3 3 0 8 2 rtentry 176 220 0 145 5 0 5 5 0 8 0 unpcb 144 1493 0 1469 10 8 2 6 0 8 1 syncache 336 8 0 8 3 3 0 1 0 8 0 tcpqe 32 6 0 6 2 2 0 1 0 8 0 tcpcb 736 832 0 826 13 9 4 7 0 8 3 arp 136 24 0 15 1 0 1 1 0 8 0 inpcb 328 2630 0 2619 15 8 7 12 0 8 6 nd6 144 42 0 26 1 0 1 1 0 8 0 pkpcb 40 18 0 18 2 1 1 1 0 8 1 kcovpl 48 15 0 7 1 0 1 1 0 8 0 ppxss 1192 126 0 126 1 0 1 1 0 8 1 pppxif 1504 8 0 8 2 2 0 1 0 8 0 pffrag 232 14 0 4 1 0 1 1 0 482 0 pffrnode 88 10 0 0 1 0 1 1 0 8 0 pffrent 40 100 0 90 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 pfrktable 1344 2 0 1 1 0 1 1 0 8 0 pfanchor 1288 2 0 0 1 0 1 1 0 8 0 pfstitem 24 82 0 31 1 0 1 1 0 8 0 pfstkey 128 82 0 31 2 0 2 2 0 8 0 pfstate 384 82 0 31 6 0 6 6 0 8 0 pfsrctr 152 32 0 23 1 0 1 1 0 8 0 pfrule 1344 41 0 30 2 1 1 2 0 8 0 rttmr 136 3 0 3 2 2 0 1 0 8 0 art_heap8 4096 4 0 0 4 0 4 4 0 8 0 art_heap4 256 1151 0 780 34 8 26 28 0 8 1 art_table 40 1155 0 780 5 0 5 5 0 8 0 art_node 32 216 0 150 1 0 1 1 0 8 0 sysvmsgpl 40 9 0 6 1 0 1 1 0 8 0 semapl 112 104 0 94 1 0 1 1 0 8 0 shmpl 112 41 0 5 2 0 2 2 0 8 0 dirhash 1024 55 0 38 3 0 3 3 0 8 0 dino2pl 256 5254 0 3737 96 0 96 96 0 8 0 ffsino 296 5254 0 3737 118 0 118 118 0 8 0 nchpl 144 8021 0 6299 64 0 64 64 0 8 0 rtmask 32 13 0 13 3 3 0 1 0 8 0 uvmvnodes 80 5926 0 0 121 0 121 121 0 8 0 vnodes 216 5926 0 0 330 0 330 330 0 8 0 namei 1024 27806 0 27806 2 1 1 2 0 8 1 percpumem 16 200 0 151 1 0 1 1 0 8 0 kstatmem 264 152 0 124 4 2 2 3 0 8 0 acpiwqpl 32 2 0 2 1 0 1 1 1 8 1 scsiplug 72 13 0 13 2 1 1 1 0 8 1 scxspl 216 37493 0 37493 18 15 3 8 1 8 3 plimitpl 152 339 0 321 1 0 1 1 0 8 0 sigapl 424 2415 0 2365 8 2 6 8 0 8 0 knotepl 120 585 0 0 18 0 18 18 0 8 0 kqueuepl 224 965 0 952 7 4 3 5 0 8 1 pipepl 344 446 0 416 11 8 3 9 0 8 0 fdescpl 528 2372 0 2340 3 0 3 3 0 8 0 filepl 160 16532 0 16297 21 8 13 17 0 8 0 lockfpl 104 933 0 931 2 1 1 2 0 8 0 lockfspl 48 409 0 407 1 0 1 1 0 8 0 sessionpl 144 32 0 23 1 0 1 1 0 8 0 pgrppl 48 208 0 191 1 0 1 1 0 8 0 ucredpl 104 2908 0 2894 1 0 1 1 0 8 0 zombiepl 144 2367 0 2365 1 0 1 1 0 8 0 processpl 1232 2415 0 2365 6 1 5 6 0 8 0 procpl 664 5628 0 5565 8 2 6 7 0 8 0 sosppl 168 9 0 9 2 1 1 1 0 8 1 sockpl 752 4477 0 4439 33 22 11 18 0 8 7 mcl64k 65536 7 0 0 1 0 1 1 0 8 0 mcl16k 16384 4 0 0 1 0 1 1 0 8 0 mcl12k 12288 1 0 0 1 0 1 1 0 8 0 mcl9k 9216 2 0 0 1 0 1 1 0 8 0 mcl8k 8192 2 0 0 1 0 1 1 0 8 0 mcl4k 4096 120 0 0 15 0 15 15 0 8 0 mcl2k2 2112 3 0 0 1 0 1 1 0 8 0 mcl2k 2048 82 0 0 10 0 10 10 0 8 1 mtagpl 96 53 0 0 2 0 2 2 0 8 0 mbufpl 256 1169 0 0 73 0 73 73 0 8 0 bufpl 280 13818 0 7675 439 0 439 439 0 8 0 anonpl 32 12920 0 0 104 0 104 104 0 246 0 amapchunkpl 152 76309 0 75760 45 11 34 34 0 158 8 amappl16 200 6631 0 6509 49 34 15 28 0 8 4 amappl15 192 11 0 11 1 1 0 1 0 8 0 amappl14 184 132 0 120 1 0 1 1 0 8 0 amappl13 176 8 0 8 2 2 0 1 0 8 0 amappl12 168 3126 0 3094 4 1 3 3 0 8 0 amappl11 160 60 0 46 1 0 1 1 0 8 0 amappl10 152 3 0 3 1 1 0 1 0 8 0 amappl9 144 280 0 277 1 0 1 1 0 8 0 amappl8 136 21 0 18 1 0 1 1 0 8 0 amappl7 128 124 0 111 1 0 1 1 0 8 0 amappl6 120 250 0 246 1 0 1 1 0 8 0 amappl5 112 150 0 140 1 0 1 1 0 8 0 amappl4 104 314 0 293 1 0 1 1 0 8 0 amappl3 96 12309 0 12200 3 0 3 3 0 8 0 amappl2 88 2627 0 2547 2 0 2 2 0 8 0 amappl1 80 17173 0 16566 15 0 15 15 0 8 0 amappl 88 19344 0 19159 5 0 5 5 0 92 0 dma32768 32768 1 0 1 1 1 0 1 0 8 0 dma4096 4096 1 0 1 1 1 0 1 0 8 0 dma1024 1024 2 0 1 1 0 1 1 0 8 0 dma256 256 6 0 6 1 1 0 1 0 8 0 dma128 128 259 0 259 4 3 1 1 0 8 1 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 19 0 18 1 0 1 1 0 8 0 aobjpl 72 43 0 5 1 0 1 1 0 8 0 uaddrrnd 24 2372 0 2340 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 2372 0 2340 1 0 1 1 0 8 0 vmmpekpl 168 18833 0 18775 3 0 3 3 0 8 0 vmmpepl 168 150689 0 148508 120 14 106 113 0 357 3 vmsppl 488 2371 0 2340 6 1 5 5 0 8 0 rwobjpl 80 44135 0 37115 148 0 148 148 0 8 3 pdppl 4096 4752 0 4680 116 42 74 86 0 8 2 pvpl 32 21705 0 0 177 2 175 175 0 265 0 pmappl 256 2371 0 2340 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 379 0 66 10 0 10 10 0 8 0 ddb{0}> machine ddbcpu 0 Invalid cpu 0 ddb{0}> trace memset() at memset+0x52 VOP_WRITE(fffffd806b1cf378,ffff80002a2be508,7,fffffd80097fb4e0) at VOP_WRITE+0x101 sys/kern/vfs_vops.c:245 vn_write(fffffd80600c0450,ffff80002a2be508,0) at vn_write+0x1d3 sys/kern/vfs_vnops.c:408 dofilewritev(ffff8000fffe02c8,6,ffff80002a2be508,0,ffff80002a2be5c0) at dofilewritev+0x242 sys/kern/sys_generic.c:380 sys_write(ffff8000fffe02c8,ffff80002a2be670,ffff80002a2be5c0) at sys_write+0xa2 sys/kern/sys_generic.c:300 syscall(ffff80002a2be670) at syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80002a2be670) at syscall+0xbd4 sys/arch/amd64/amd64/trap.c:746 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xf69adfdbf40, count: -7 ddb{0}> machine ddbcpu 1 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp x86_ipi_db(ffff8000299edff0) at x86_ipi_db+0x27 sys/arch/amd64/amd64/db_interface.c:394 x86_ipi_handler() at x86_ipi_handler+0xd9 sys/arch/amd64/amd64/ipi.c:106 Xresume_lapic_ipi() at Xresume_lapic_ipi+0x27 __mp_lock(ffffffff838f9428) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:134 [inline] __mp_lock(ffffffff838f9428) at __mp_lock+0x192 sys/kern/kern_lock.c:165 syscall(ffff80002a33a780) at syscall+0xaf4 mi_syscall sys/sys/syscall_mi.h:175 [inline] syscall(ffff80002a33a780) at syscall+0xaf4 sys/arch/amd64/amd64/trap.c:746 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7958af2b5d70, count: 9 ddb{1}> trace x86_ipi_db(ffff8000299edff0) at x86_ipi_db+0x27 sys/arch/amd64/amd64/db_interface.c:394 x86_ipi_handler() at x86_ipi_handler+0xd9 sys/arch/amd64/amd64/ipi.c:106 Xresume_lapic_ipi() at Xresume_lapic_ipi+0x27 __mp_lock(ffffffff838f9428) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:134 [inline] __mp_lock(ffffffff838f9428) at __mp_lock+0x192 sys/kern/kern_lock.c:165 syscall(ffff80002a33a780) at syscall+0xaf4 mi_syscall sys/sys/syscall_mi.h:175 [inline] syscall(ffff80002a33a780) at syscall+0xaf4 sys/arch/amd64/amd64/trap.c:746 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7958af2b5d70, count: -6