uvm_fault(0xffffffff83a2d578, 0xffff8000275620a8, 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 *357507 48685 0 0x2 0x1 0 syz-executor ffs2_balloc(fffff8807ea0ae00,8581a,50,fffff88007ffd9c0,1,ffff80002a777678) at ffs2_balloc+0xa0a sys/ufs/ffs/ffs_balloc.c:614 ffs_write(ffff80002a777700) at ffs_write+0x4f9 sys/ufs/ffs/ffs_vnops.c:345 VOP_WRITE(fffff8807c4877f0,ffff80002a7777b0,3,fffff88007ffd9c0) at VOP_WRITE+0x101 sys/kern/vfs_vops.c:245 ktrwriteraw(ffff8000314bd778,fffff8807c4877f0,fffff88007ffd9c0,ffff80002a777880,ffff80002a777860) at ktrwriteraw+0x19b sys/kern/kern_ktrace.c:692 ktrsysret(ffff8000314bd778,5b,0,ffff80002a777940) at ktrsysret+0x17f ktrwrite2 sys/kern/kern_ktrace.c:-1 [inline] ktrsysret(ffff8000314bd778,5b,0,ffff80002a777940) at ktrsysret+0x17f sys/kern/kern_ktrace.c:209 syscall(ffff80002a7779f0) at syscall+0xad9 mi_syscall_return sys/sys/syscall_mi.h:204 [inline] syscall(ffff80002a7779f0) at syscall+0xad9 sys/arch/amd64/amd64/trap.c:804 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x77673e4b5dc0, 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(0xffffffff83a2d578, 0xffff8000275620a8, 0, 1) -> d ddb> trace ffs2_balloc(fffff8807ea0ae00,8581a,50,fffff88007ffd9c0,1,ffff80002a777678) at ffs2_balloc+0xa0a sys/ufs/ffs/ffs_balloc.c:614 ffs_write(ffff80002a777700) at ffs_write+0x4f9 sys/ufs/ffs/ffs_vnops.c:345 VOP_WRITE(fffff8807c4877f0,ffff80002a7777b0,3,fffff88007ffd9c0) at VOP_WRITE+0x101 sys/kern/vfs_vops.c:245 ktrwriteraw(ffff8000314bd778,fffff8807c4877f0,fffff88007ffd9c0,ffff80002a777880,ffff80002a777860) at ktrwriteraw+0x19b sys/kern/kern_ktrace.c:692 ktrsysret(ffff8000314bd778,5b,0,ffff80002a777940) at ktrsysret+0x17f ktrwrite2 sys/kern/kern_ktrace.c:-1 [inline] ktrsysret(ffff8000314bd778,5b,0,ffff80002a777940) at ktrsysret+0x17f sys/kern/kern_ktrace.c:209 syscall(ffff80002a7779f0) at syscall+0xad9 mi_syscall_return sys/sys/syscall_mi.h:204 [inline] syscall(ffff80002a7779f0) at syscall+0xad9 sys/arch/amd64/amd64/trap.c:804 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x77673e4b5dc0, count: -7 ddb> show registers rdi 0 rsi 0 rbp 0xffff80002a777620 rbx 0xfffff8807ea0ae00 rdx 0 rcx 0xffff800027562000 rax 0x15 r8 0xffffffffffffffff r9 0xffff80002a777678 r10 0xac2295ca8b5808c1 r11 0xea4676e1069ccb37 r12 0x1 r13 0xffff800000c47800 r14 0xffff80002a7774c0 r15 0xfffff8806dec9cc0 rip 0xffffffff82768e4a ffs2_balloc+0xa0a cs 0x8 rflags 0x10246 __ALIGN_SIZE+0xf246 rsp 0xffff80002a7774b0 ss 0 ffs2_balloc+0xa0a: movq 0(%rcx,%rax,8),%r14 ddb> show proc PROC (syz-executor) tid=357507 pid=48685 tcnt=1 stat=onproc flags process=2 proc=1 runpri=32, usrpri=86, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff8000314bcfb0,0xffff80002a767248 process=0xffff8000314b9f98 user=0xffff80002a772000, vmspace=0xfffff8806cad9180 estcpu=36, cpticks=4, pctcpu=0.0, user=0, sys=4, intr=0 ddb> ps PID TID PPID UID S FLAGS WAIT COMMAND 55697 376354 48685 0 2 0 syz-executor 55697 113686 48685 0 3 0x4000080 fsleep syz-executor 21845 344901 73003 60929 2 0x10 syz-executor 21845 382897 73003 60929 3 0x4000090 kqread syz-executor 9500 94526 25430 0 2 0x10 syz-executor 9500 79501 25430 0 3 0x4000090 kqread syz-executor 9698 382472 38704 0 2 0 syz-executor 63708 326165 87857 0 2 0 syz-executor 63708 224106 87857 0 2 0x4000000 syz-executor 25172 205876 9556 0 2 0 syz-executor 25172 89299 9556 0 3 0x4000080 fsleep syz-executor 25172 175340 9556 0 3 0x4000080 fsleep syz-executor 5487 108136 1 0 3 0x100083 ttyin getty *48685 357507 49286 0 7 0x3 syz-executor 51568 293123 49286 0 3 0x82 piperd syz-executor 9556 89886 49286 0 3 0x82 nanoslp syz-executor 38704 129909 49286 0 2 0x2 syz-executor 87857 304284 49286 0 3 0x82 nanoslp syz-executor 73003 61976 49286 0 3 0x82 nanoslp syz-executor 25430 86227 49286 0 3 0x82 nanoslp syz-executor 20050 183739 49286 0 3 0x82 nanoslp syz-executor 49286 255945 1 0 2 0x2 syz-executor 83788 57194 0 0 3 0x14200 bored smr 87216 313183 0 0 2 0x14200 zerothread 13350 151184 0 0 3 0x14200 aiodoned aiodoned 61262 271343 0 0 3 0x14200 syncer update 28414 169491 0 0 3 0x14200 cleaner cleaner 62862 463729 0 0 3 0x14200 reaper reaper 34773 506368 0 0 3 0x14200 pgdaemon pagedaemon 73673 308190 0 0 3 0x14200 bored viomb 27149 45068 0 0 3 0x40014200 acpi0 acpi0 12428 95699 0 0 2 0x14200 softnet0 25161 175112 0 0 3 0x14200 bored systqmp 67944 468621 0 0 3 0x14200 bored systq 39783 199231 0 0 3 0x40014200 tmoslp softclock 59603 231877 0 0 3 0x40014200 idle0 1 457869 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 11080 12171K 12718K 166960K 13298 0 pcb 17 14K 16K 166960K 238 0 rtable 280 13K 13K 166960K 515 0 pf 35 14K 21K 166960K 197 0 ifaddr 42 7K 8K 166960K 83 0 ifgroup 50 2K 2K 166960K 120 0 sysctl 3 1K 9K 166960K 11 0 counters 33 17K 18K 166960K 74 0 ioctlops 0 0K 4K 166960K 370 0 iov 0 0K 20K 166960K 166 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1448 91K 92K 166960K 2394 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 9K 166960K 12 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 1K 166960K 105 0 dirhash 12 2K 2K 166960K 24 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 16 61K 89K 166960K 779 0 sigio 0 0K 0K 166960K 7 0 proc 23 33K 91K 166960K 634 0 subproc 72 4K 4K 166960K 90 0 NFS srvsock 1 0K 0K 166