uvm_fault(0xffffffff83a23fd8, 0xffff800028bf21a0, 0, 1) -> d kernel: page fault trap, code=0 Stopped at ffs2_balloc+0xa0a: movq 0(%rcx,%rax,8),%r14 TID PID UID PRFLAGS PFLAGS CPU COMMAND ffs2_balloc(fffffc806ca70d00,1015d9,40,fffffc8007ffd750,1,ffff80002f8b0e78) at ffs2_balloc+0xa0a sys/ufs/ffs/ffs_balloc.c:614 ffs_write(ffff80002f8b0f00) at ffs_write+0x4f9 sys/ufs/ffs/ffs_vnops.c:345 VOP_WRITE(fffffc806d80c048,ffff80002f8b0f98,23,fffffc8007ffd750) at VOP_WRITE+0x101 sys/kern/vfs_vops.c:245 vn_rdwr(1,fffffc806d80c048,ffff80002f8b10d0,40,0,1,51ee2637e9e08b42,0,1008,40) at vn_rdwr+0x12d sys/kern/vfs_vnops.c:330 acct_process(ffff80002a770010) at acct_process+0x7a2 sys/kern/kern_acct.c:246 exit1(ffff80002a770010,0,0,1) at exit1+0x5c4 sys/kern/kern_exit.c:228 sys_exit(ffff80002a770010,ffff80002f8b1300,ffff80002f8b1250) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff80002f8b1300) at syscall+0x962 mi_syscall sys/sys/syscall_mi.h:-1 [inline] syscall(ffff80002f8b1300) at syscall+0x962 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x70e9ba044e20, 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> ddb> set $lines = 0 ddb> set $maxwidth = 0 ddb> show panic *cpu0: uvm_fault(0xffffffff83a23fd8, 0xffff800028bf21a0, 0, 1) -> d ddb> trace ffs2_balloc(fffffc806ca70d00,1015d9,40,fffffc8007ffd750,1,ffff80002f8b0e78) at ffs2_balloc+0xa0a sys/ufs/ffs/ffs_balloc.c:614 ffs_write(ffff80002f8b0f00) at ffs_write+0x4f9 sys/ufs/ffs/ffs_vnops.c:345 VOP_WRITE(fffffc806d80c048,ffff80002f8b0f98,23,fffffc8007ffd750) at VOP_WRITE+0x101 sys/kern/vfs_vops.c:245 vn_rdwr(1,fffffc806d80c048,ffff80002f8b10d0,40,0,1,51ee2637e9e08b42,0,1008,40) at vn_rdwr+0x12d sys/kern/vfs_vnops.c:330 acct_process(ffff80002a770010) at acct_process+0x7a2 sys/kern/kern_acct.c:246 exit1(ffff80002a770010,0,0,1) at exit1+0x5c4 sys/kern/kern_exit.c:228 sys_exit(ffff80002a770010,ffff80002f8b1300,ffff80002f8b1250) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff80002f8b1300) at syscall+0x962 mi_syscall sys/sys/syscall_mi.h:-1 [inline] syscall(ffff80002f8b1300) at syscall+0x962 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x70e9ba044e20, count: -9 ddb> show registers rdi 0 rsi 0 rbp 0xffff80002f8b0e20 rbx 0xfffffc806ca70d00 rdx 0 rcx 0xffff800028bf2000 rax 0x34 r8 0xffffffffffffffff r9 0xffff80002f8b0e78 r10 0xe8422ebb530fc6e6 r11 0xbd3a526a8eb5314f r12 0x1 r13 0xffff800000c48800 r14 0xffff80002f8b0cc0 r15 0xfffffc806e849888 rip 0xffffffff8165704a ffs2_balloc+0xa0a cs 0x8 rflags 0x10246 __ALIGN_SIZE+0xf246 rsp 0xffff80002f8b0cb0 ss 0 ffs2_balloc+0xa0a: movq 0(%rcx,%rax,8),%r14 ddb> show proc PROC (syz-executor) tid=23037 pid=89190 tcnt=0 stat=onproc flags process=1008 proc=2000 runpri=16, usrpri=86, slppri=16, nice=20 wchan=0x0, wmesg=, ps_single=0xffff80002a770010 scnt=-1 ecnt=1 forw=0xffffffffffffffff, list=0xffff80002a770a70,0xffff80002a771a10 process=0xffff80002a76db10 user=0xffff80002f8ac000, vmspace=0xfffffc807ec638a0 estcpu=36, cpticks=2, pctcpu=0.0, user=0, sys=1, intr=0 ddb> ps PID TID PPID UID S FLAGS WAIT COMMAND 1275 42269 46210 0 2 0 syz-executor 1275 387825 46210 0 2 0x4000000 syz-executor 10839 167918 97678 0 2 0 syz-executor 10839 297172 97678 0 3 0x4000080 fsleep syz-executor 34606 420021 1620 0 2 0 syz-executor 34606 499926 1620 0 2 0x4000000 syz-executor 34606 227161 1620 0 3 0x4000080 fsleep syz-executor 99256 120938 80992 0 2 0 syz-executor 99256 33432 80992 0 3 0x4000080 fsleep syz-executor 99256 136125 80992 0 3 0x4000080 fsleep syz-executor 38967 113590 32191 0 2 0x2 syz-executor 97678 306630 32191 0 2 0xc82 syz-executor 89283 304269 0 0 3 0x14200 acct acct 84319 361678 1 0 3 0x80 nanoslp init 48726 247714 32191 0 3 0x82 wait syz-executor 46210 300373 32191 0 2 0xc82 syz-executor 80992 511322 32191 0 2 0xc82 syz-executor 1620 518769 32191 0 2 0xc82 syz-executor 83118 165934 32191 0 3 0x82 nanoslp syz-executor 32191 435218 1 0 3 0x82 wait syz-executor 55703 289066 0 0 3 0x14200 bored smr 97837 315680 0 0 2 0x14200 zerothread 52530 434234 0 0 3 0x14200 aiodoned aiodoned 11306 320801 0 0 3 0x14200 syncer update 63719 182249 0 0 3 0x14200 cleaner cleaner 59253 147002 0 0 3 0x14200 reaper reaper 46461 4856 0 0 3 0x14200 pgdaemon pagedaemon 51445 142836 0 0 3 0x14200 bored viomb 75955 452901 0 0 3 0x40014200 acpi0 acpi0 86546 249147 0 0 3 0x14200 bored softnet0 75570 316460 0 0 3 0x14200 smrbar systqmp 19376 355874 0 0 3 0x14200 bored systq 76590 290672 0 0 3 0x40014200 tmoslp softclock 25034 204546 0 0 3 0x40014200 idle0 1 51355 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb> show all locks No such command ddb> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 11042 12170K 13301K 166960K 13662 0 pcb 17 14K 15K 166960K 126 0 rtable 192 7K 9K 166960K 594 0 pf 33 13K 20K 166960K 230 0 ifaddr 37 6K 7K 166960K 90 0 ifgroup 47 1K 2K 166960K 125 0 sysctl 3 1K 9K 166960K 17 0 counters 33 17K 18K 166960K 59 0 ioctlops 0 0K 4K 166960K 327 0 iov 0 0K 16K 166960K 25 0 mount 1 1K 1K 166960K 1 0 log 6 12K 12K 166960K 10 0 vnodes 1566 98K 99K 166960K 2399 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 5K 166960K 19 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 1K 166960K 146 0 dirhash 12 2K 2K 166960K 18 0 ACPI 1734 201K 291K 166960K 11964 0 file desc 14 53K 232K 166960K 811 0 sigio 0 0K 0K 166960K 6 0 proc 15 33K 83K 166960K 709 0 subproc 72 4K 4K 166960K 108 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 74 0 in_multi 79 5K 7K 166960K 177 0 ether_multi 1 0K 0K 166960K 2 0 mrt 0 0K 0K 166960K 24 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 109 493K 493K 166960K 109 0 exec 0 0K 1K 166960K 486 0 fusefs mount 1 32K 32K 166960K 1 0 pfkey data 0 0K 0K 166960K 1 0 tdb 3 0K 0K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 125 78K 160K 166960K 8414 0 UVM aobj 6 2K 2K 166960K 6 0 pinsyscall 17 34K 90K 166960K 2027 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 19 0 NDP 15 0K 2K 166960K 58 0 temp 54 9115K 9178K 166960K 27766 0 kqueue 2 4K 31K 166960K 146 0 SYN cache 2 16K 16K 166960K 2 0 ddb>