login: uvm_fault(0xffffffff839ce248, 0xffff8000218c2020, 0, 2) -> d kernel: page fault trap, code=2 Stopped at ffs2_balloc+0xc79: movq %r13,0(%rcx,%rax,8) TID PID UID PRFLAGS PFLAGS CPU COMMAND 460241 58913 0 0 0 0 syz-executor *474073 58913 0 0 0x4000000 1K syz-executor ffs2_balloc(fffffd806e573e50,6001000003,1,fffffd80097fd548,1,ffff800037f9a060) at ffs2_balloc+0xc79 sys/ufs/ffs/ffs_balloc.c:655 ffs_truncate(fffffd806e573e50,6001000004,0,fffffd80097fd548) at ffs_truncate+0x4f8 sys/ufs/ffs/ffs_inode.c:217 ufs_setattr(ffff800037f9a180) at ufs_setattr+0x8e9 sys/ufs/ufs/ufs_vnops.c:403 VOP_SETATTR(fffffd800cbb58b8,ffff800037f9a208,fffffd80097fd548,ffff80002a220a78) at VOP_SETATTR+0x11b sys/kern/vfs_vops.c:210 dotruncate(ffff80002a220a78,fffffd800cbb58b8,6001000004) at dotruncate+0x1da sys/kern/vfs_syscalls.c:2892 sys_truncate(ffff80002a220a78,ffff800037f9a4e0,ffff800037f9a430) at sys_truncate+0x13e sys/kern/vfs_syscalls.c:2916 syscall(ffff800037f9a4e0) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff800037f9a4e0) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xbcc6d778450, count: 7 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(0xffffffff839ce248, 0xffff8000218c2020, 0, 2) -> d ddb{1}> trace ffs2_balloc(fffffd806e573e50,6001000003,1,fffffd80097fd548,1,ffff800037f9a060) at ffs2_balloc+0xc79 sys/ufs/ffs/ffs_balloc.c:655 ffs_truncate(fffffd806e573e50,6001000004,0,fffffd80097fd548) at ffs_truncate+0x4f8 sys/ufs/ffs/ffs_inode.c:217 ufs_setattr(ffff800037f9a180) at ufs_setattr+0x8e9 sys/ufs/ufs/ufs_vnops.c:403 VOP_SETATTR(fffffd800cbb58b8,ffff800037f9a208,fffffd80097fd548,ffff80002a220a78) at VOP_SETATTR+0x11b sys/kern/vfs_vops.c:210 dotruncate(ffff80002a220a78,fffffd800cbb58b8,6001000004) at dotruncate+0x1da sys/kern/vfs_syscalls.c:2892 sys_truncate(ffff80002a220a78,ffff800037f9a4e0,ffff800037f9a430) at sys_truncate+0x13e sys/kern/vfs_syscalls.c:2916 syscall(ffff800037f9a4e0) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff800037f9a4e0) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xbcc6d778450, count: -8 ddb{1}> show registers rdi 0 rsi 0xffffffff rbp 0xffff800037f99ef0 rbx 0 rdx 0xffff8000015f7000 rcx 0xffff8000218c2000 rax 0x4 r8 0 r9 0x1 r10 0 r11 0x78c853bebd2b7615 r12 0x1 r13 0x4cc48 acpi_pdirpa+0x38ab9 r14 0xffffffff r15 0xffff800000c31800 rip 0xffffffff822fec89 ffs2_balloc+0xc79 cs 0x8 rflags 0x10286 __ALIGN_SIZE+0xf286 rsp 0xffff800037f99d70 ss 0 ffs2_balloc+0xc79: movq %r13,0(%rcx,%rax,8) ddb{1}> show proc PROC (syz-executor) tid=474073 pid=58913 tcnt=2 stat=onproc flags process=0 proc=4000000 runpri=17, usrpri=81, slppri=17, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff80002a220548,0xffff800036f922d0 process=0xffff80003879ce90 user=0xffff800037f95000, vmspace=0xfffffd806f39f7a8 estcpu=31, cpticks=1, pctcpu=0.0, user=0, sys=1, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 43412 440774 72891 0 2 0 syz-executor 58913 460241 63296 0 7 0 syz-executor *58913 474073 63296 0 7 0x4000000 syz-executor 77685 342692 33130 60929 2 0x10 syz-executor 77685 16562 33130 60929 3 0x4000090 fsleep syz-executor 78370 307307 23013 0 2 0 syz-executor 16011 35407 39360 0 2 0 syz-executor 65518 442889 49920 0 2 0 syz-executor 65518 363285 49920 0 2 0x4000000 syz-executor 70891 437505 16579 0 2 0 syz-executor 70891 425260 16579 0 2 0x4000000 syz-executor 65528 340145 1 0 3 0x100083 ttyin getty 33130 284752 16912 0 2 0x2 syz-executor 22424 342403 16912 0 3 0x82 nanoslp syz-executor 63296 134166 16912 0 3 0x82 nanoslp syz-executor 49920 452352 16912 0 3 0x82 nanoslp syz-executor 23013 107314 16912 0 3 0x82 nanoslp syz-executor 72891 275967 16912 0 3 0x82 nanoslp syz-executor 39360 377026 16912 0 3 0x82 nanoslp syz-executor 16579 458319 16912 0 3 0x82 nanoslp syz-executor 16912 462722 1 0 3 0x82 kqread syz-executor 73794 155306 0 0 3 0x14200 bored smr 12728 336384 0 0 2 0x14200 zerothread 6