uvm_fault(0xffffffff8399da30, 0xffff8000272a20e8, 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 *309003 94637 0 0x2 0x1 0 syz-executor ffs2_balloc(fffffb006c3ba300,a471d,50,fffffb0007ffdc98,1,ffff80002a867ac8) at ffs2_balloc+0xa0a sys/ufs/ffs/ffs_balloc.c:614 ffs_write(ffff80002a867b50) at ffs_write+0x4f9 sys/ufs/ffs/ffs_vnops.c:345 VOP_WRITE(fffffb006e8d5298,ffff80002a867c00,3,fffffb0007ffdc98) at VOP_WRITE+0x101 sys/kern/vfs_vops.c:245 ktrwriteraw(ffff80002a736f98,fffffb006e8d5298,fffffb0007ffdc98,ffff80002a867cd0,ffff80002a867cb0) at ktrwriteraw+0x19b sys/kern/kern_ktrace.c:692 ktrsysret(ffff80002a736f98,5b,0,ffff80002a867d90) at ktrsysret+0x17f ktrwrite2 sys/kern/kern_ktrace.c:-1 [inline] ktrsysret(ffff80002a736f98,5b,0,ffff80002a867d90) at ktrsysret+0x17f sys/kern/kern_ktrace.c:209 syscall(ffff80002a867e40) at syscall+0xad9 mi_syscall_return sys/sys/syscall_mi.h:204 [inline] syscall(ffff80002a867e40) at syscall+0xad9 sys/arch/amd64/amd64/trap.c:804 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7d2f1a420960, 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(0xffffffff8399da30, 0xffff8000272a20e8, 0, 1) -> d ddb> trace ffs2_balloc(fffffb006c3ba300,a471d,50,fffffb0007ffdc98,1,ffff80002a867ac8) at ffs2_balloc+0xa0a sys/ufs/ffs/ffs_balloc.c:614 ffs_write(ffff80002a867b50) at ffs_write+0x4f9 sys/ufs/ffs/ffs_vnops.c:345 VOP_WRITE(fffffb006e8d5298,ffff80002a867c00,3,fffffb0007ffdc98) at VOP_WRITE+0x101 sys/kern/vfs_vops.c:245 ktrwriteraw(ffff80002a736f98,fffffb006e8d5298,fffffb0007ffdc98,ffff80002a867cd0,ffff80002a867cb0) at ktrwriteraw+0x19b sys/kern/kern_ktrace.c:692 ktrsysret(ffff80002a736f98,5b,0,ffff80002a867d90) at ktrsysret+0x17f ktrwrite2 sys/kern/kern_ktrace.c:-1 [inline] ktrsysret(ffff80002a736f98,5b,0,ffff80002a867d90) at ktrsysret+0x17f sys/kern/kern_ktrace.c:209 syscall(ffff80002a867e40) at syscall+0xad9 mi_syscall_return sys/sys/syscall_mi.h:204 [inline] syscall(ffff80002a867e40) at syscall+0xad9 sys/arch/amd64/amd64/trap.c:804 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7d2f1a420960, count: -7 ddb> show registers rdi 0 rsi 0 rbp 0xffff80002a867a70 rbx 0xfffffb006c3ba300 rdx 0 rcx 0xffff8000272a2000 rax 0x1d r8 0xffffffffffffffff r9 0xffff80002a867ac8 r10 0x987fa2f84f77844a r11 0xcc6658321147c1d2 r12 0x1 r13 0xffff800000c47800 r14 0xffff80002a867910 r15 0xfffffb0062674670 rip 0xffffffff829ea9aa ffs2_balloc+0xa0a cs 0x8 rflags 0x10246 __ALIGN_SIZE+0xf246 rsp 0xffff80002a867900 ss 0 ffs2_balloc+0xa0a: movq 0(%rcx,%rax,8),%r14 ddb> show proc PROC (syz-executor) tid=309003 pid=94637 tcnt=1 stat=onproc flags process=2 proc=1 runpri=32, usrpri=71, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff80002a736538,0xffff80002a7367e0 process=0xffff80002a79c010 user=0xffff80002a862000, vmspace=0xfffffb00772988a8 estcpu=21, cpticks=4, pctcpu=0.0, user=0, sys=4, intr=0 ddb> ps PID TID PPID UID S FLAGS WAIT COMMAND 67899 27345 54288 0 2 0 syz-executor 67899 501051 54288 0 2 0x4000000 syz-executor 4586 450576 26089 -1 3 0x90 fsleep syz-executor 4586 45726 26089 -1 3 0x4000090 kqread syz-executor 42518 34986 94637 0 3 0x80 fsleep syz-executor 42518 168186 94637 0 3 0x4000080 wsevent_read syz-executor 41319 223225 74820 0 3 0x80 fsleep syz-executor 41319 202011 74820 0 3 0x4000080 bell syz-executor 16724 457488 2733 0 3 0x80 fsleep syz-executor 16724 185143 2733 0 3 0x4000080 sbwait syz-executor 19574 10202 69358 0 3 0x80 fsleep syz-executor 19574 328919 69358 0 3 0x4000080 sbwait syz-executor 19574 184467 69358 0 3 0x4000080 sbwait syz-executor 44106 217618 56503 0 3 0x80 fsleep syz-executor 44106 469661 56503 0 3 0x4000080 lockf syz-executor 27562 23961 56192 0 3 0x80 fsleep syz-executor 27562 221483 56192 0 3 0x4000080 pipewr syz-executor 68299 30735 1 0 3 0x80 ttyopn init 51618 382426 0 0 3 0x14280 nfsidl nfsio 47863 469685 0 0 3 0x14280 nfsidl nfsio 25744 283088 0 0 3 0x14280 nfsidl nfsio 7857 110343 0 0 3 0x14280 nfsidl nfsio 73736 256658 0 0 3 0x14280 nfsidl nfsio 85885 141659 0 0 3 0x14280 nfsidl nfsio 39739 444710 0 0 3 0x14280 nfsidl nfsio 20572 370695 0 0 3 0x14280 nfsidl nfsio 26720 475984 0 0 3 0x14280 nfsidl nfsio 29380 405299 0 0 3 0x14280 nfsidl nfsio 49868 179821 0 0 3 0x14280 nfsidl nfsio 60940 178980 0 0 3 0x14280 nfsidl nfsio 41979 293238 0 0 3 0x14280 nfsidl nfsio 79319 146316 0 0 3 0x14280 nfsidl nfsio 3884 326787 0 0 3 0x14280 nfsidl nfsio 31318 160168 0 0 3 0x14280 nfsidl nfsio 87525 18353 0 0 3 0x14280 nfsidl nfsio 18936 376692 0 0 3 0x14280 nfsidl nfsio 33246 240741 0 0 3 0x14280 nfsidl nfsio 91608 203763 0 0 3 0x14280 nfsidl nfsio 54288 121594 67958 0 2 0xc82 syz-executor 74820 301660 67958 0 2 0xc82 syz-executor *94637 309003 67958 0 7 0x3 syz-executor 56192 184918 67958 0 2 0xc82 syz-executor 56503 18849 67958 0 2 0xc82 syz-executor 2733 25229 67958 0 2 0xc82 syz-executor 69358 166600 67958 0 2 0xc82 syz-executor 26089 461141 67958 0 2 0xc82 syz-executor 67958 293736 1 0 3 0x82 kqread syz-executor 89859 246631 0 0 3 0x14200 bored smr 24198 43865 0 0 3 0x14200 pgzero zerothread 81959 490789 0 0 3 0x14200 aiodoned aiodoned 68307 409974 0 0 3 0x14200 syncer update 55672 80398 0 0 3 0x14200 cleaner cleaner 19730 431793 0 0 3 0x14200 reaper reaper 98746 334241 0 0 3 0x14200 pgdaemon pagedaemon 35102 96251 0 0 3 0x14200 bored viomb 61639 307679 0 0 3 0x40014200 acpi0 acpi0 73526 16858 0 0 3 0x14200 bored softnet0 18310 415057 0 0 3 0x14200 bored systqmp 47862 32281 0 0 3 0x14200 bored systq 35842 522428 0 0 3 0x40014200 tmoslp softclock 44558 159611 0 0 3 0x40014200 idle0 1 91570 0 0 3 0x82 wait init 0 0 -1 0 3 0x10010200 scheduler swapper ddb> show all locks No such command ddb>