uvm_fault(0xffffffff839f0190, 0xffff80001d0b2088, 0, 1) -> d kernel: page fault trap, code=0 Stopped at ffs2_balloc+0xa0d: movq 0(%rcx,%rax,8),%r14 TID PID UID PRFLAGS PFLAGS CPU COMMAND 252057 12067 0 0 0 0 syz-executor *471561 43082 0 0 0x4000001 1K syz-executor ffs2_balloc(fffffd806d8af130,7648a,50,fffffd80097fd340,1,ffff80002e784398) at ffs2_balloc+0xa0d sys/ufs/ffs/ffs_balloc.c:614 ffs_write(ffff80002e784420) at ffs_write+0x4f9 sys/ufs/ffs/ffs_vnops.c:345 VOP_WRITE(fffffd805eaac370,ffff80002e7844d0,3,fffffd80097fd340) at VOP_WRITE+0x101 sys/kern/vfs_vops.c:245 ktrwriteraw(ffff80002a222540,fffffd805eaac370,fffffd80097fd340,ffff80002e7845a0,ffff80002e784580) at ktrwriteraw+0x1be sys/kern/kern_ktrace.c:692 ktrsysret(ffff80002a222540,36,0,ffff80002e784670) at ktrsysret+0x192 ktrwrite2 sys/kern/kern_ktrace.c:-1 [inline] ktrsysret(ffff80002a222540,36,0,ffff80002e784670) at ktrsysret+0x192 sys/kern/kern_ktrace.c:209 syscall(ffff80002e784720) at syscall+0xa51 mi_syscall_return sys/sys/syscall_mi.h:204 [inline] syscall(ffff80002e784720) at syscall+0xa51 sys/arch/amd64/amd64/trap.c:804 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x2d284b84d80, 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{1}> ddb{1}> set $lines = 0 ddb{1}> set $maxwidth = 0 ddb{1}> show panic *cpu1: uvm_fault(0xffffffff839f0190, 0xffff80001d0b2088, 0, 1) -> d ddb{1}> trace ffs2_balloc(fffffd806d8af130,7648a,50,fffffd80097fd340,1,ffff80002e784398) at ffs2_balloc+0xa0d sys/ufs/ffs/ffs_balloc.c:614 ffs_write(ffff80002e784420) at ffs_write+0x4f9 sys/ufs/ffs/ffs_vnops.c:345 VOP_WRITE(fffffd805eaac370,ffff80002e7844d0,3,fffffd80097fd340) at VOP_WRITE+0x101 sys/kern/vfs_vops.c:245 ktrwriteraw(ffff80002a222540,fffffd805eaac370,fffffd80097fd340,ffff80002e7845a0,ffff80002e784580) at ktrwriteraw+0x1be sys/kern/kern_ktrace.c:692 ktrsysret(ffff80002a222540,36,0,ffff80002e784670) at ktrsysret+0x192 ktrwrite2 sys/kern/kern_ktrace.c:-1 [inline] ktrsysret(ffff80002a222540,36,0,ffff80002e784670) at ktrsysret+0x192 sys/kern/kern_ktrace.c:209 syscall(ffff80002e784720) at syscall+0xa51 mi_syscall_return sys/sys/syscall_mi.h:204 [inline] syscall(ffff80002e784720) at syscall+0xa51 sys/arch/amd64/amd64/trap.c:804 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x2d284b84d80, count: -7 ddb{1}> show registers rdi 0 rsi 0 rbp 0xffff80002e784340 rbx 0 rdx 0xffff800001703fc0 rcx 0xffff80001d0b2000 rax 0x11 r8 0xffffffffffffffff r9 0xffff80002e784398 r10 0x3a396de76723f52d r11 0xca2daff068e743ae r12 0x1 r13 0xffff800000c31800 r14 0xffff80002e7841d0 r15 0xfffffd806a3ed268 rip 0xffffffff82c7e63d ffs2_balloc+0xa0d cs 0x8 rflags 0x10246 __ALIGN_SIZE+0xf246 rsp 0xffff80002e7841c0 ss 0x10 ffs2_balloc+0xa0d: movq 0(%rcx,%rax,8),%r14 ddb{1}> show proc PROC (syz-executor) tid=471561 pid=43082 tcnt=2 stat=onproc flags process=0 proc=4000001 runpri=32, usrpri=78, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff80002a240d10,0xffff80002a223a10 process=0xffff8000fffdf048 user=0xffff80002e77f000, vmspace=0xfffffd806d5d23f8 estcpu=28, cpticks=6, pctcpu=0.4, user=0, sys=6, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 12067 252057 36044 0 7 0 syz-executor 12067 336336 36044 0 2 0x4000000 syz-executor 60869 426499 44904 0 2 0 syz-executor 60869 318375 44904 0 3 0x4000080 fsleep syz-executor 93048 101607 69625 0 2 0 syz-executor 93048 11266 69625 0 3 0x4000080 pipewr syz-executor 30893 129683 60770 0 2 0 syz-executor 30893 103223 60770 0 3 0x4000080 fsleep syz-executor 74542 506027 74989 0 2 0 syz-executor 74542 96188 74989 0 2 0x4000000 syz-executor 89414 129873 11262 0 2 0 syz-executor 89414 389355 11262 0 3 0x4000080 fsleep syz-executor 89414 448897 11262 0 3 0x4000080 fsleep syz-executor 89414 300243 11262 0 3 0x4000080 fsleep syz-executor 89414 460894 11262 0 3 0x4000080 fsleep syz-executor 43082 450998 95369 0 2 0 syz-executor *43082 471561 95369 0 7 0x4000001 syz-executor 95369 347518 70290 0 3 0x82 nanoslp syz-executor 14057 477936 1 0 3 0x82 nanoslp getty 38427 445042 0 0 3 0x14200 acct acct 51614 480404 0 0 3 0x14280 nfsidl nfsio 33734 439468 0 0 3 0x14280 nfsidl nfsio 12220 311654 0 0 3 0x14280 nfsidl nfsio 61869 301255 0 0 3 0x14280 nfsidl nfsio 15909 378221 0 0 3 0x14280 nfsidl nfsio 22288 338393 0 0 3 0x14280 nfsidl nfsio 76867 96113 0 0 3 0x14280 nfsidl nfsio 25669 213074 0 0 3 0x14280 nfsidl nfsio 26234 442420 0 0 3 0x14280 nfsidl nfsio 75969 10029 0 0 3 0x14280 nfsidl nfsio 39987 456959 0 0 3 0x14280 nfsidl nfsio 10464 457955 0 0 3 0x14280 nfsidl nfsio 8685 477684 0 0 3 0x14280 nfsidl nfsio 25353 449948 0 0 3 0x14280 nfsidl nfsio 12672 501516 0 0 3 0x14280 nfsidl nfsio 20840 345853 0 0 3 0x14280 nfsidl nfsio 22732 15586 0 0 3 0x14280 nfsidl nfsio 67715 2972 0 0 3 0x14280 nfsidl nfsio 53860 171125 0 0 3 0x14280 nfsidl nfsio 7805 7058 0 0 3 0x14280 nfsidl nfsio 36044 65954 70290 0 3 0x82 nanoslp syz-executor 44904 106706 70290 0 3 0x82 nanoslp syz-executor 74989 235626 70290 0 3 0x82 nanoslp syz-executor 69625 301594 70290 0 3 0x82 nanoslp syz-executor 60770 465596 70290 0 3 0x82 nanoslp syz-executor 11262 507483 70290 0 3 0x82 nanoslp syz-executor 16934 322669 70290 0 3 0x82 wait syz-executor 70290 299111 1 0 2 0x2 syz-executor 49421 80702 0 0 3 0x14200 bored smr 21081 89468 0 0 2 0x14200 zerothread 99869 315376 0 0 3 0x14200 aiodoned aiodoned 22384 9088 0 0 3 0x14200 syncer update 53472 137853 0 0 3 0x14200 cleaner cleaner 77341 324028 0 0 3 0x14200 reaper reaper 91222 45560 0 0 3 0x14200 pgdaemon pagedaemon 52319 398419 0 0 3 0x14200 bored viomb 53776 467920 0 0 3 0x40014200 acpi0 acpi0 94220 307900 0 0 3 0x40014200 idle1 50602 265733 0 0 3 0x14200 bored softnet1 60755 7471 0 0 3 0x14200 bored softnet0 58555 174359 0 0 3 0x14200 bored systqmp 7031 222943 0 0 3 0x14200 bored systq 51870 489998 0 0 3 0x14200 tmoslp softclockmp 52970 379472 0 0 3 0x40014200 tmoslp softclock 29674 1381 0 0 3 0x40014200 idle0 1 105178 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}>