uvm_fault(0xffffffff839ce170, 0xffff8000268e2050, 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 *123228 82455 0 0x2 0x1 0 syz-executor ffs2_balloc(fffffd806648c100,5bc71,48,fffffd8007ffd888,1,ffff80002a7d3468) at ffs2_balloc+0xa0a sys/ufs/ffs/ffs_balloc.c:614 ffs_write(ffff80002a7d34f0) at ffs_write+0x4f9 sys/ufs/ffs/ffs_vnops.c:345 VOP_WRITE(fffffd80628d9050,ffff80002a7d35a0,3,fffffd8007ffd888) at VOP_WRITE+0x101 sys/kern/vfs_vops.c:245 ktrwriteraw(ffff80002a7787d8,fffffd80628d9050,fffffd8007ffd888,ffff80002a7d3670,ffff80002a7d3650) at ktrwriteraw+0x19b sys/kern/kern_ktrace.c:692 ktrsysret(ffff80002a7787d8,88,16,ffff80002a7d3730) at ktrsysret+0x17f ktrwrite2 sys/kern/kern_ktrace.c:-1 [inline] ktrsysret(ffff80002a7787d8,88,16,ffff80002a7d3730) at ktrsysret+0x17f sys/kern/kern_ktrace.c:209 syscall(ffff80002a7d37e0) at syscall+0xad9 mi_syscall_return sys/sys/syscall_mi.h:204 [inline] syscall(ffff80002a7d37e0) at syscall+0xad9 sys/arch/amd64/amd64/trap.c:804 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7f1f29d34b70, 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> ddb> set $lines = 0 ddb> set $maxwidth = 0 ddb> show panic *cpu0: uvm_fault(0xffffffff839ce170, 0xffff8000268e2050, 0, 1) -> d ddb> trace ffs2_balloc(fffffd806648c100,5bc71,48,fffffd8007ffd888,1,ffff80002a7d3468) at ffs2_balloc+0xa0a sys/ufs/ffs/ffs_balloc.c:614 ffs_write(ffff80002a7d34f0) at ffs_write+0x4f9 sys/ufs/ffs/ffs_vnops.c:345 VOP_WRITE(fffffd80628d9050,ffff80002a7d35a0,3,fffffd8007ffd888) at VOP_WRITE+0x101 sys/kern/vfs_vops.c:245 ktrwriteraw(ffff80002a7787d8,fffffd80628d9050,fffffd8007ffd888,ffff80002a7d3670,ffff80002a7d3650) at ktrwriteraw+0x19b sys/kern/kern_ktrace.c:692 ktrsysret(ffff80002a7787d8,88,16,ffff80002a7d3730) at ktrsysret+0x17f ktrwrite2 sys/kern/kern_ktrace.c:-1 [inline] ktrsysret(ffff80002a7787d8,88,16,ffff80002a7d3730) at ktrsysret+0x17f sys/kern/kern_ktrace.c:209 syscall(ffff80002a7d37e0) at syscall+0xad9 mi_syscall_return sys/sys/syscall_mi.h:204 [inline] syscall(ffff80002a7d37e0) at syscall+0xad9 sys/arch/amd64/amd64/trap.c:804 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7f1f29d34b70, count: -7 ddb> show registers rdi 0 rsi 0 rbp 0xffff80002a7d3410 rbx 0xfffffd806648c100 rdx 0 rcx 0xffff8000268e2000 rax 0xa r8 0xffffffffffffffff r9 0xffff80002a7d3468 r10 0xc5bdcf87736a9f64 r11 0xd35f25849e0957e4 r12 0x1 r13 0xffff800000c47800 r14 0xffff80002a7d32b0 r15 0xfffffd805c7f6040 rip 0xffffffff82188c5a ffs2_balloc+0xa0a cs 0x8 rflags 0x10246 __ALIGN_SIZE+0xf246 rsp 0xffff80002a7d32a0 ss 0x10 ffs2_balloc+0xa0a: movq 0(%rcx,%rax,8),%r14 ddb> show proc PROC (syz-executor) tid=123228 pid=82455 tcnt=1 stat=onproc flags process=2 proc=1 runpri=17, usrpri=50, slppri=17, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff80002a778010,0xffff80002a779778 process=0xffff80002a79cd90 user=0xffff80002a7ce000, vmspace=0xfffffd807ec672e0 estcpu=36, cpticks=6, pctcpu=0.0, user=0, sys=6, intr=0 ddb> ps PID TID PPID UID S FLAGS WAIT COMMAND 27643 163333 73699 0 2 0xc80 syz-executor 27643 247923 73699 0 2 0x4000c80 syz-executor 27643 380559 73699 0 3 0x4000080 fsleep syz-executor 92900 264897 3199 0 2 0xc80 syz-executor 92900 279133 3199 0 3 0x4000080 fsleep syz-executor 81538 358077 65006 0 2 0 syz-executor 81538 399950 65006 0 3 0x4000080 fsleep syz-executor 17516 390882 2022 60929 2 0x10 syz-executor 17516 309917 2022 60929 2 0x4000010 syz-executor 47560 254824 85691 0 2 0 syz-executor 47560 197010 85691 0 2 0x4000000 syz-executor 2254 363797 47602 0 2 0xc80 syz-executor 2254 34835 47602 0 3 0x4000080 ttyout syz-executor 2254 479828 47602 0 3 0x4000080 fsleep syz-executor 96470 2180 77789 0 2 0xc80 syz-executor 96470 195660 77789 0 3 0x4000080 pipewr syz-executor 96470 243564 77789 0 3 0x4000080 fsleep syz-executor 62247 399744 0 0 3 0x14200 acct acct 5765 497624 1 0 3 0x100083 ttyin getty 2022 278168 94424 0 2 0xc82 syz-executor 85691 51457 94424 0 2 0xc82 syz-executor 73699 107641 94424 0 2 0xc82 syz-executor 65006 478710 94424 0 2 0xc82 syz-executor 3199 418726 94424 0 2 0xc82 syz-executor 77789 452935 94424 0 2 0xc82 syz-executor 47602 451990 94424 0 2 0xc82 syz-executor *82455 123228 94424 0 7 0x3 syz-executor 94424 464028 31040 0 3 0x82 kqread syz-executor 31040 82939 1 0 3 0x10008a sigsusp ksh 50607 417341 60578 73 3 0x1100090 kqread syslogd 60578 174984 1 0 3 0x100082 sbwait syslogd 32431 389940 0 0 3 0x14200 bored smr 29775 268005 0 0 2 0x14200 zerothread 45751 456652 0 0 3 0x14200 aiodoned aiodoned 38968 457875 0 0 3 0x14200 syncer update 96792 494386 0 0 3 0x14200 cleaner cleaner 32193 439999 0 0 3 0x14200 reaper reaper 77437 497726 0 0 3 0x14200 pgdaemon pagedaemon 88030 217863 0 0 3 0x14200 bored viomb 12985 240256 0 0 3 0x40014200 acpi0 acpi0 84301 228726 0 0 2 0x14200 softnet0 58427 432879 0 0 3 0x14200 bored systqmp 61968 496568 0 0 3 0x14200 bored systq 17837 64474 0 0 3 0x40014200 tmoslp softclock 82112 488434 0 0 3 0x40014200 idle0 1 153528 0 0 3 0x82 wait init 0 0 -1 0 3 0x10010200 scheduler swapper ddb> show all locks No such command ddb> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 11069 12303K 14338K 166960K 14018 0 pcb 18 16K 18K 166960K 304 0 rtable 206 9K 10K 166960K 499 0 pf 25 12K 13K 166960K 60 0 ifaddr 30 5K 7K 166960K 65 0 ifgroup 39 1K 2K 166960K 92 0 sysctl 4 1K 9K 166960K 16 0 counters 31 17K 18K 166960K 52 0 ioctlops 0 0K 4K 166960K 267 0 iov 0 0K 16K 166960K 41 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1480 93K 93K 166960K 2156 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 20K 24K 166960K 17 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 0K 166960K 117 0 dirhash 12 2K 2K 166960K 18 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 17 61K 97K 166960K 912 0 sigio 0 0K 0K 166960K 13 0 proc 47 34K 124K 166960K 625 0 subproc 72 4K 4K 166960K 81 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 1 0K 0K 166960K 133 0 in_multi 70 5K 7K 166960K 155 0 ether_multi 1 0K 0K 166960K 7 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 211 943K 943K 166960K 211 0 exec 0 0K 1K 166960K 439 0 fusefs mount 1 32K 32K 166960K 1 0 pfkey data 0 0K 0K 166960K 2 0 tdb 3 0K 0K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 165 104K 151K 166960K 9390 0 UVM aobj 25 2K 4K 166960K 26 0 pinsyscall 24 48K 96K 166960K 2052 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 23 0 NDP 9 0K 2K 166960K 44 0 temp 76 9116K 9180K 166960K 37408 0 kqueue 6 7K 31K 166960K 183 0 SYN cache 2 16K 16K 166960K 2 0 ddb>