uvm_fault(0xffffffff835b52b8, 0xffff80001b8a43c0, 0, 2) -> d kernel: page fault trap, code=2 Stopped at memset+0x52: repe stosq %es:(%rdi) TID PID UID PRFLAGS PFLAGS CPU COMMAND 343004 70927 0 0 0 1 syz-executor memset() at memset+0x52 ffs_write(ffff8000371d61e0) at ffs_write+0xbab sys/ufs/ffs/ffs_vnops.c:401 VOP_WRITE(fffffd80718f2980,ffff8000371d6278,23,fffffd807f7d3340) at VOP_WRITE+0x102 sys/kern/vfs_vops.c:245 vn_rdwr(1,fffffd80718f2980,ffff8000371d6390,40,0,1,b2085fd4c5c9957b,0,1008,0) at vn_rdwr+0x12d sys/kern/vfs_vnops.c:324 acct_process(ffff8000371e6f58) at acct_process+0x7bb sys/kern/kern_acct.c:245 exit1(ffff8000371e6f58,0,0,1) at exit1+0x790 sys/kern/kern_exit.c:237 sys_exit(ffff8000371e6f58,ffff8000371d65e0,ffff8000371d6530) at sys_exit+0x1a syscall(ffff8000371d65e0) at syscall+0xaf8 mi_syscall sys/sys/syscall_mi.h:179 [inline] syscall(ffff8000371d65e0) at syscall+0xaf8 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x75a6b4841a90, count: 6 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(0xffffffff835b52b8, 0xffff80001b8a43c0, 0, 2) -> d ddb{0}> trace memset() at memset+0x52 ffs_write(ffff8000371d61e0) at ffs_write+0xbab sys/ufs/ffs/ffs_vnops.c:401 VOP_WRITE(fffffd80718f2980,ffff8000371d6278,23,fffffd807f7d3340) at VOP_WRITE+0x102 sys/kern/vfs_vops.c:245 vn_rdwr(1,fffffd80718f2980,ffff8000371d6390,40,0,1,b2085fd4c5c9957b,0,1008,0) at vn_rdwr+0x12d sys/kern/vfs_vnops.c:324 acct_process(ffff8000371e6f58) at acct_process+0x7bb sys/kern/kern_acct.c:245 exit1(ffff8000371e6f58,0,0,1) at exit1+0x790 sys/kern/kern_exit.c:237 sys_exit(ffff8000371e6f58,ffff8000371d65e0,ffff8000371d6530) at sys_exit+0x1a syscall(ffff8000371d65e0) at syscall+0xaf8 mi_syscall sys/sys/syscall_mi.h:179 [inline] syscall(ffff8000371d65e0) at syscall+0xaf8 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x75a6b4841a90, count: -9 ddb{0}> show registers rdi 0xffff80001b8a43c0 rsi 0 rbp 0xffff8000371d6100 rbx 0xa3c0 __ALIGN_SIZE+0x93c0 rdx 0 rcx 0x88 rax 0 r8 0x440 r9 0xffff8000371d6060 r10 0x11c6e00eb0718280 r11 0xffff80001b8a43c0 r12 0x2800 __ALIGN_SIZE+0x1800 r13 0x23c0 __ALIGN_SIZE+0x13c0 r14 0xfffffd80718f2980 r15 0x1 rip 0xffffffff8296d222 memset+0x52 cs 0x8 rflags 0x10206 __ALIGN_SIZE+0xf206 rsp 0xffff8000371d5ef8 ss 0x10 memset+0x52: repe stosq %es:(%rdi) ddb{0}> show proc PROC (syz-executor) tid=80443 pid=88143 tcnt=0 stat=onproc flags process=1008 proc=2000 runpri=32, usrpri=83, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0xffff8000371e6f58 scnt=-1 ecnt=1 forw=0xffffffffffffffff, list=0xffff8000371e6538,0xffffffff83607e60 process=0xffff80003721f1d8 user=0xffff8000371d1000, vmspace=0xfffffd80770af1d0 estcpu=33, cpticks=0, pctcpu=0.2, user=0, sys=1, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 70927 343004 52702 0 7 0 syz-executor 70927 336211 52702 0 3 0x4000080 fsleep syz-executor 78959 26978 63120 0 2 0x10 syz-executor 78959 440789 63120 0 2 0x4000010 syz-executor 32718 379800 89836 0 3 0x80 fsleep syz-executor 32718 28295 89836 0 3 0x4000080 kqsel syz-executor 39042 522409 14787 0 3 0x80 fsleep syz-executor 39042 61265 14787 0 3 0x4000080 kqsel syz-executor 80098 429197 98939 0 3 0x80 fsleep syz-executor 80098 160069 98939 0 3 0x4000080 sbwait syz-executor 64475 166592 52802 0 3 0x80 fsleep syz-executor 64475 457336 52802 0 3 0x4000080 netacc syz-executor 63872 409286 90992 0 3 0x80 fsleep syz-executor 63872 367417 90992 0 3 0x4000080 bell syz-executor 89836 425224 34377 0 2 0x482 syz-executor 98939 107610 34377 0 3 0x82 nanoslp syz-executor 14787 106440 34377 0 2 0x482 syz-executor 52702 438807 34377 0 2 0x482 syz-executor 90992 139961 34377 0 3 0x82 nanoslp syz-executor 16794 77314 34377 0 2 0x482 syz-executor 63120 493931 34377 0 3 0x82 nanoslp syz-executor 52802 129771 34377 0 3 0x82 nanoslp syz-executor 40012 168122 0 0 3 0x14200 acct acct 36685 190145 0 0 3 0x14200 bored sosplice 34377 19631 88838 0 3 0x82 kqread syz-executor 88838 205084 9647 0 3 0x10008a sigsusp ksh 9647 93568 31293 0 3 0x98 kqread sshd-session 31293 274338 51634 0 3 0x92 kqread sshd-session 94792 411564 1 0 3 0x100083 ttyin getty 51634 110450 1 0 3 0x88 kqread sshd 29385 158492 70379 74 3 0x1100092 bpf pflogd 70379 387929 1 0 3 0x80 sbwait pflogd 32299 29176 18725 73 2 0x1100010 syslogd 18725 473346 1 0 3 0x100082 sbwait syslogd 45509 473773 1 0 3 0x100080 kqread resolvd 61862 234846 85736 77 3 0x100092 kqread dhcpleased 93445 95582 85736 77 3 0x100092 kqread dhcpleased 85736 426938 1 0 3 0x80 kqread dhcpleased 2241 84933 0 0 2 0x40014200 smr 54887 466430 0 0 3 0x14200 pgzero zerothread 54589 3592 0 0 3 0x14200 aiodoned aiodoned 42673 466918 0 0 3 0x14200 syncer update 59474 105890 0 0 3 0x14200 cleaner cleaner 49269 447885 0 0 3 0x14200 reaper reaper 95004 254497 0 0 3 0x14200 pgdaemon pagedaemon 12775 482045 0 0 3 0x14200 bored viomb 85355 213031 0 0 3 0x40014200 acpi0 acpi0 67011 458314 0 0 3 0x40014200 idle1 18363 450882 0 0 3 0x14200 bored softnet3 16396 188997 0 0 3 0x14200 bored softnet2 89715 96743 0 0 3 0x14200 bored softnet1 5065 462129 0 0 3 0x14200 bored softnet0 96368 8456 0 0 3 0x14200 bored systqmp 65352 306036 0 0 3 0x14200 bored systq 84904 273628 0 0 2 0x14200 softclockmp 97485 260873 0 0 3 0x40014200 tmoslp softclock 8323 166756 0 0 3 0x40014200 idle0 1 77494 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks Process 70927 (syz-executor) thread 0xffff8000371e7468 (343004) shared rwlock vmmaplk r = 0 (0xfffffd80770af9a0) #0 witness_lock+0x5b8 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5b8 sys/kern/subr_witness.c:1151 #1 uvmfault_lookup+0x122 sys/uvm/uvm_fault.c:1785 #2 uvm_fault_check+0x47 sys/uvm/uvm_fault.c:672 #3 uvm_fault+0x112 sys/uvm/uvm_fault.c:600 #4 upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:188 #5 usertrap+0x2d8 sys/arch/amd64/amd64/trap.c:436 #6 recall_trap+0x8 Process 32299 (syslogd) thread 0xffff8000ffffd960 (29176) exclusive rrwlock inode r = 0 (0xfffffd806e4a31b0) #0 witness_lock+0x5b8 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5b8 sys/kern/subr_witness.c:1151 #1 rw_enter+0x41b sys/kern/kern_rwlock.c:309 #2 rrw_enter+0xbe sys/kern/kern_rwlock.c:464 #3 VOP_LOCK+0xa6 sys/kern/vfs_vops.c:524 #4 vn_lock+0xa4 sys/kern/vfs_vnops.c:564 #5 sys_fsync+0x152 sys/kern/vfs_syscalls.c:2927 #6 syscall+0xaf8 mi_syscall sys/sys/syscall_mi.h:179 [inline] #6 syscall+0xaf8 sys/arch/amd64/amd64/trap.c:577 #7 Xsyscall+0x128 ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10211 10351K 10488K 166960K 12322 0 pcb 17 13K 14K 166960K 187 0 rtable 237 7K 7K 166960K 1442 0 pf 38 18K 82K 166960K 141 0 ifaddr 45 8K 8K 166960K 189 0 ifgroup 60 2K 2K 166960K 217 0 sysctl 3 0K 0K 166960K 3 0 counters 66 36K 37K 166960K 148 0 ioctlops 0 0K 4K 166960K 1601 0 iov 0 0K 24K 166960K 94 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1490 94K 94K 166960K 2400 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 9K 166960K 10 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 1K 166960K 34 0 dirhash 12 2K 2K 166960K 21 0 ACPI 1697 195K 286K 166960K 12548 0 file desc 17 61K 93K 166960K 1133 0 sigio 0 0K 0K 166960K 10 0 proc 70 91K 128K 166960K 1461 0 subproc 104 6K 6K 166960K 520 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 148 0 in_multi 99 7K 7K 166960K 471 0 ether_multi 1 0K 0K 166960K 1 0 mrt 1 0K 0K 166960K 2 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 97 440K 440K 166960K 97 0 exec 0 0K 1K 166960K 887 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 245 73K 89K 166960K 10200 0 UVM aobj 18 2K 2K 166960K 19 0 pinsyscall 43 86K 106K 166960K 3034 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 25 0 NDP 21 1K 2K 166960K 134 0 temp 55 6818K 6926K 166960K 227813 0 kqueue 13 20K 32K 166960K 108 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 24 0 0 1 0 1 1 0 8 0 rtpcb 120 130 0 125 1 0 1 1 0 8 0 rtentry 112 515 0 405 4 0 4 4 0 8 0 unpcb 144 373 0 354 4 3 1 3 0 8 0 syncache 336 4 0 4 2 2 0 1 0 8 0 tcpcb 808 354 0 347 12 11 1 8 0 8 0 arp 120 86 0 68 1 0 1 1 0 8 0 ipq 40 1 0 1 1 1 0 1 0 8 0 ipqe 40 3 0 3 1 1 0 1 0 8 0 inpcb 336 1052 0 1036 13 11 2 10 0 8 0 nd6 136 124 0 100 1 0 1 1 0 8 0 pkpcb 40 3 0 3 3 3 0 1 0 8 0 kcovpl 48 40 0 32 1 0 1 1 0 8 0 ppxss 1168 6 0 6 2 2 0 1 0 8 0 pffrag 232 4 0 1 1 0 1 1 0 482 0 pffrnode 88 4 0 1 1 0 1 1 0 8 0 pffrent 40 7 0 4 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 pftag 88 2 0 2 1 1 0 1 0 8 0 pfstitem 24 45 0 37 1 0 1 1 0 8 0 pfstkey 128 45 0 37 2 0 2 2 0 8 0 pfstate 376 44 0 37 4 1 3 4 0 8 0 pfrule 1344 23 0 16 2 0 2 2 0 8 0 art_heap8 4096 2 0 0 2 0 2 2 0 8 0 art_heap4 256 2087 0 1628 32 3 29 29 0 8 0 art_table 32 2089 0 1628 4 0 4 4 0 8 0 art_node 16 512 0 413 1 0 1 1 0 8 0 sysvmsgpl 40 9 0 5 1 0 1 1 0 8 0 semupl 112 1 0 1 1 1 0 1 0 8 0 semapl 112 32 0 22 1 0 1 1 0 8 0 shmpl 112 16 0 1 1 0 1 1 0 8 0 dirhash 1024 23 0 6 3 0 3 3 0 8 0 dino2pl 256 2614 0 1046 99 0 99 99 0 8 0 ffsino 272 2614 0 1046 105 0 105 105 0 8 0 nchpl 144 3566 0 1840 65 0 65 65 0 8 0 uvmvnodes 80 3554 0 0 73 0 73 73 0 8 0 vnodes 216 3554 0 0 198 0 198 198 0 8 0 namei 1024 15535 0 15535 7 6 1 2 0 8 1 percpumem 16 88 0 41 1 0 1 1 0 8 0 vcpupl 3904 4 0 0 1 0 1 1 0 8 0 vmpool 696 6 0 2 2 1 1 1 0 8 0 kstatmem 264 108 0 82 3 0 3 3 0 8 0 scsiplug 72 2 0 2 2 2 0 1 0 8 0 scxspl 216 24517 0 24517 13 11 2 8 1 8 2 plimitpl 152 137 0 119 1 0 1 1 0 8 0 sigapl 424 1370 0 1318 7 0 7 7 0 8 0 futexpl 64 9523 0 9517 4 3 1 1 0 8 0 knotepl 120 343 0 0 10 0 10 10 0 8 0 kqueuepl 216 269 0 258 7 4 3 5 0 8 2 pipepl 320 244 0 217 3 0 3 3 0 8 0 fdescpl 496 1349 0 1318 6 1 5 5 0 8 0 filepl 152 7314 0 7056 21 10 11 15 0 8 0 lockfpl 104 325 0 323 1 0 1 1 0 8 0 lockfspl 48 102 0 100 1 0 1 1 0 8 0 sessionpl 144 54 0 45 1 0 1 1 0 8 0 pgrppl 48 101 0 84 1 0 1 1 0 8 0 ucredpl 104 942 0 927 1 0 1 1 0 8 0 zombiepl 144 1319 0 1318 1 0 1 1 0 8 0 processpl 1160 1370 0 1318 6 1 5 5 0 8 0 procpl 648 2238 0 2179 7 1 6 7 0 8 0 srpgc 96 10 0 10 3 3 0 1 0 8 0 sosppl 168 9 0 9 3 3 0 1 0 8 0 sockpl 664 1630 0 1590 17 13 4 12 0 8 0 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 mcl9k 9216 1 0 0 1 0 1 1 0 8 0 mcl8k 8192 5 0 0 1 0 1 1 0 8 0 mcl4k 4096 4 0 0 1 0 1 1 0 8 0 mcl2k 2048 252 0 0 32 0 32 32 0 8 0 mtagpl 96 5 0 0 1 0 1 1 0 8 0 mbufpl 256 273 0 0 16 0 16 16 0 8 0 bufpl 280 7279 0 1107 441 0 441 441 0 8 0 anonpl 24 234464 0 230908 51 0 51 51 0 185 24 amapchunkpl 152 32445 0 31916 33 2 31 31 0 158 10 amappl16 200 4868 0 4849 38 29 9 15 0 8 7 amappl15 192 26 0 26 1 1 0 1 0 8 0 amappl14 184 182 0 170 1 0 1 1 0 8 0 amappl13 176 7 0 7 1 1 0 1 0 8 0 amappl12 168 2499 0 2467 4 2 2 3 0 8 0 amappl11 160 53 0 39 1 0 1 1 0 8 0 amappl10 152 8 0 8 1 1 0 1 0 8 0 amappl9 144 130 0 130 1 1 0 1 0 8 0 amappl8 136 22 0 20 1 0 1 1 0 8 0 amappl7 128 193 0 180 1 0 1 1 0 8 0 amappl6 120 484 0 483 1 0 1 1 0 8 0 amappl5 112 266 0 254 1 0 1 1 0 8 0 amappl4 104 407 0 386 1 0 1 1 0 8 0 amappl3 96 6398 0 6274 5 1 4 4 0 8 0 amappl2 88 1059 0 997 2 0 2 2 0 8 0 amappl1 80 12653 0 12065 14 1 13 14 0 8 0 amappl 88 9560 0 9379 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 7 0 7 2 2 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 18 0 1 1 0 1 1 0 8 0 uaddrrnd 24 1355 0 1319 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 1355 0 1319 1 0 1 1 0 8 0 vmmpekpl 168 12570 0 12522 3 0 3 3 0 8 0 vmmpepl 168 89115 0 87190 111 21 90 96 0 357 6 vmsppl 440 1354 0 1319 8 3 5 5 0 8 0 rwobjpl 56 31230 0 26711 69 4 65 65 0 8 0 pdppl 4096 2717 0 2642 155 72 83 85 0 8 8 pvpl 32 28086 0 0 227 0 227 227 0 265 0 pmappl 248 1354 0 1319 3 0 3 3 0 8 0 extentpl 40 56 0 38 1 0 1 1 0 8 0 phpool 112 488 0 110 11 0 11 11 0 8 0 ddb{0}> machine ddbcpu 0 Invalid cpu 0 ddb{0}> trace memset() at memset+0x52 ffs_write(ffff8000371d61e0) at ffs_write+0xbab sys/ufs/ffs/ffs_vnops.c:401 VOP_WRITE(fffffd80718f2980,ffff8000371d6278,23,fffffd807f7d3340) at VOP_WRITE+0x102 sys/kern/vfs_vops.c:245 vn_rdwr(1,fffffd80718f2980,ffff8000371d6390,40,0,1,b2085fd4c5c9957b,0,1008,0) at vn_rdwr+0x12d sys/kern/vfs_vnops.c:324 acct_process(ffff8000371e6f58) at acct_process+0x7bb sys/kern/kern_acct.c:245 exit1(ffff8000371e6f58,0,0,1) at exit1+0x790 sys/kern/kern_exit.c:237 sys_exit(ffff8000371e6f58,ffff8000371d65e0,ffff8000371d6530) at sys_exit+0x1a syscall(ffff8000371d65e0) at syscall+0xaf8 mi_syscall sys/sys/syscall_mi.h:179 [inline] syscall(ffff8000371d65e0) at syscall+0xaf8 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x75a6b4841a90, count: -9 ddb{0}> machine ddbcpu 1 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp x86_ipi_db(ffff800029b7bff0) at x86_ipi_db+0x27 sys/arch/amd64/amd64/db_interface.c:393 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(ffffffff83626128) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:113 [inline] __mp_lock(ffffffff83626128) at __mp_lock+0x192 sys/kern/kern_lock.c:144 uvm_fault(fffffd80770af8b0,9951d693000,0,1) at uvm_fault+0x1ed sys/uvm/uvm_fault.c:622 upageflttrap(ffff8000371b89d0,9951d693000) at upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:188 usertrap(ffff8000371b89d0) at usertrap+0x2d8 sys/arch/amd64/amd64/trap.c:436 recall_trap() at recall_trap+0x8 end of kernel end trace frame: 0x764a2feb8520, count: 7 ddb{1}> trace x86_ipi_db(ffff800029b7bff0) at x86_ipi_db+0x27 sys/arch/amd64/amd64/db_interface.c:393 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(ffffffff83626128) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:113 [inline] __mp_lock(ffffffff83626128) at __mp_lock+0x192 sys/kern/kern_lock.c:144 uvm_fault(fffffd80770af8b0,9951d693000,0,1) at uvm_fault+0x1ed sys/uvm/uvm_fault.c:622 upageflttrap(ffff8000371b89d0,9951d693000) at upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:188 usertrap(ffff8000371b89d0) at usertrap+0x2d8 sys/arch/amd64/amd64/trap.c:436 recall_trap() at recall_trap+0x8 end of kernel end trace frame: 0x764a2feb8520, count: -8