uvm_fault(0xffffffff8396b6b8, 0xffff800019992018, 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(fffffd8077281800,3f000,1000,fffffd8007ffda28,1,ffff80002a7d7358) at ffs2_balloc+0xa0a sys/ufs/ffs/ffs_balloc.c:614 ffs_write(ffff80002a7d73e0) at ffs_write+0x4f9 sys/ufs/ffs/ffs_vnops.c:345 VOP_WRITE(fffffd807ad1d7d0,ffff80002a7d7470,0,fffffd8007ffda28) at VOP_WRITE+0x101 sys/kern/vfs_vops.c:245 uvn_io(fffffd8070875a08,ffff80002a7d75f0,1,39,1) at uvn_io+0x485 sys/uvm/uvm_vnode.c:1232 uvm_pager_put(fffffd8070875a08,fffffd800742a180,ffff80002a7d7690,ffff80002a7d76b4,39,0,4ef1c3857bc97df5) at uvm_pager_put+0x10a sys/uvm/uvm_pager.c:505 uvn_flush(fffffd8070875a08,0,0,19) at uvn_flush+0x68d sys/uvm/uvm_vnode.c:705 uvn_detach(fffffd8070875a08) at uvn_detach+0xb8 sys/uvm/uvm_vnode.c:344 uvm_unmap_detach(ffff80002a7d77c0,0) at uvm_unmap_detach+0x15e sys/uvm/uvm_map.c:1370 uvm_map_teardown(fffffd807ece9a10) at uvm_map_teardown+0x357 sys/uvm/uvm_map.c:2536 exit1(ffff80002a7867d8,43,0,1) at exit1+0x6e6 sys/kern/kern_exit.c:259 sys_exit(ffff80002a7867d8,ffff80002a7d7980,ffff80002a7d78d0) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff80002a7d7980) at syscall+0x962 mi_syscall sys/sys/syscall_mi.h:-1 [inline] syscall(ffff80002a7d7980) at syscall+0x962 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x750c721fdf60, count: 2 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(0xffffffff8396b6b8, 0xffff800019992018, 0, 1) -> d ddb> trace ffs2_balloc(fffffd8077281800,3f000,1000,fffffd8007ffda28,1,ffff80002a7d7358) at ffs2_balloc+0xa0a sys/ufs/ffs/ffs_balloc.c:614 ffs_write(ffff80002a7d73e0) at ffs_write+0x4f9 sys/ufs/ffs/ffs_vnops.c:345 VOP_WRITE(fffffd807ad1d7d0,ffff80002a7d7470,0,fffffd8007ffda28) at VOP_WRITE+0x101 sys/kern/vfs_vops.c:245 uvn_io(fffffd8070875a08,ffff80002a7d75f0,1,39,1) at uvn_io+0x485 sys/uvm/uvm_vnode.c:1232 uvm_pager_put(fffffd8070875a08,fffffd800742a180,ffff80002a7d7690,ffff80002a7d76b4,39,0,4ef1c3857bc97df5) at uvm_pager_put+0x10a sys/uvm/uvm_pager.c:505 uvn_flush(fffffd8070875a08,0,0,19) at uvn_flush+0x68d sys/uvm/uvm_vnode.c:705 uvn_detach(fffffd8070875a08) at uvn_detach+0xb8 sys/uvm/uvm_vnode.c:344 uvm_unmap_detach(ffff80002a7d77c0,0) at uvm_unmap_detach+0x15e sys/uvm/uvm_map.c:1370 uvm_map_teardown(fffffd807ece9a10) at uvm_map_teardown+0x357 sys/uvm/uvm_map.c:2536 exit1(ffff80002a7867d8,43,0,1) at exit1+0x6e6 sys/kern/kern_exit.c:259 sys_exit(ffff80002a7867d8,ffff80002a7d7980,ffff80002a7d78d0) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff80002a7d7980) at syscall+0x962 mi_syscall sys/sys/syscall_mi.h:-1 [inline] syscall(ffff80002a7d7980) at syscall+0x962 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x750c721fdf60, count: -13 ddb> show registers rdi 0 rsi 0 rbp 0xffff80002a7d7300 rbx 0xfffffd8077281800 rdx 0 rcx 0xffff800019992000 rax 0x3 r8 0xffffffffffffffff r9 0xffff80002a7d7358 r10 0xdfbb53ca457659a9 r11 0x10a6da8c23bd4dd8 r12 0x1 r13 0xffff800000c47800 r14 0xffff80002a7d71a0 r15 0xfffffd8077257238 rip 0xffffffff82a0ad7a ffs2_balloc+0xa0a cs 0x8 rflags 0x10246 __ALIGN_SIZE+0xf246 rsp 0xffff80002a7d7190 ss 0x10 ffs2_balloc+0xa0a: movq 0(%rcx,%rax,8),%r14 ddb> show proc PROC (syz-executor) tid=87187 pid=73126 tcnt=0 stat=onproc flags process=a proc=2000 runpri=50, usrpri=86, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=1 forw=0xffffffffffffffff, list=0xffff80002a756f98,0xffff80002a786a80 process=0xffff80002a7bd690 user=0xffff80002a7d2000, vmspace=0xfffffd807ece9a10 estcpu=36, cpticks=16, pctcpu=0.3, user=0, sys=1, intr=0 ddb> ps PID TID PPID UID S FLAGS WAIT COMMAND 56617 102362 73126 0 2 0x2 syz-executor 91542 465181 81318 0 3 0x80 nanoslp syz-executor 91542 168275 81318 0 2 0x4000000 syz-executor 91542 497467 81318 0 3 0x4000080 fsleep syz-executor 91542 336298 81318 0 3 0x4000080 fsleep syz-executor 71521 101792 39702 0 2 0 syz-executor 71521 297584 39702 0 3 0x4000080 msgwait syz-executor 71521 154439 39702 0 2 0x4000000 syz-executor 16512 460475 1 0 3 0x82 nanoslp getty 44786 442376 0 0 3 0x14200 acct acct 81318 95668 73126 0 3 0x82 nanoslp syz-executor 14410 215347 73126 0 3 0x82 wait syz-executor 39702 180240 73126 0 2 0xc82 syz-executor 78159 470257 0 0 3 0x14200 bored smr 64507 463863 0 0 2 0x14200 zerothread 3270 233028 0 0 3 0x14200 aiodoned aiodoned 27025 72188 0 0 3 0x14200 syncer update 72080 214118 0 0 3 0x14200 cleaner cleaner 82249 400329 0 0 3 0x14200 reaper reaper 40195 44187 0 0 3 0x14200 pgdaemon pagedaemon 21474 501715 0 0 3 0x14200 bored viomb 23401 451295 0 0 3 0x40014200 acpi0 acpi0 83728 417525 0 0 2 0x14200 softnet0 12655 284911 0 0 3 0x14200 smrbar systqmp 28796 93268 0 0 3 0x14200 bored systq 70392 506659 0 0 2 0x40014200 softclock 32519 457619 0 0 3 0x40014200 idle0 1 500541 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb> show all locks No such command ddb>