login: uvm_fault(0xffffffff83a69c28, 0xffff800029ee6000, 0, 2) -> e kernel: page fault trap, code=2 Stopped at kcov_remote_enter+0x122: movq $0,0(%rcx) TID PID UID PRFLAGS PFLAGS CPU COMMAND *265333 37169 0 0 0x4000000 0 syz-executor kcov_remote_enter(0,ffff80003c970020) at kcov_remote_enter+0x122 sys/dev/kcov.c:670 timeout_run(ffffffff838a1da0,ffff80003bcf1810) at timeout_run+0xdf sys/kern/kern_timeout.c:696 softclock_process_tick_timeout(ffff80003bcf1810,0) at softclock_process_tick_timeout+0x230 sys/kern/kern_timeout.c:756 softclock(0) at softclock+0x152 sys/kern/kern_timeout.c:788 softintr_dispatch(0) at softintr_dispatch+0xf9 sys/kern/kern_softintr.c:87 dosoftint(0) at dosoftint+0x48 sys/arch/amd64/amd64/intr.c:862 Xsoftclock() at Xsoftclock+0x27 writedisklabel(d02,ffffffff8238cd00,ffff800000039000) at writedisklabel+0x1b8 sys/arch/amd64/amd64/disksubr.c:158 sdioctl(d01,84946467,ffff8000015bd000,3,ffff80003bcf1248) at sdioctl+0x959 sys/scsi/sd.c:919 VOP_IOCTL(fffffd806bd9ca30,84946467,ffff8000015bd000,3,fffffd8007ffd6e8,ffff80003bcf1248) at VOP_IOCTL+0xa3 sys/kern/vfs_vops.c:264 vn_ioctl(fffffd800af74628,84946467,ffff8000015bd000,ffff80003bcf1248) at vn_ioctl+0xea sys/kern/vfs_vnops.c:537 sys_ioctl(ffff80003bcf1248,ffff80003bcf71c0,ffff80003bcf7110) at sys_ioctl+0x660 sys/kern/sys_generic.c:-1 syscall(ffff80003bcf71c0) at syscall+0x962 mi_syscall sys/sys/syscall_mi.h:-1 [inline] syscall(ffff80003bcf71c0) at syscall+0x962 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x46d6f894df0, count: 1 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(0xffffffff83a69c28, 0xffff800029ee6000, 0, 2) -> e ddb> trace kcov_remote_enter(0,ffff80003c970020) at kcov_remote_enter+0x122 sys/dev/kcov.c:670 timeout_run(ffffffff838a1da0,ffff80003bcf1810) at timeout_run+0xdf sys/kern/kern_timeout.c:696 softclock_process_tick_timeout(ffff80003bcf1810,0) at softclock_process_tick_timeout+0x230 sys/kern/kern_timeout.c:756 softclock(0) at softclock+0x152 sys/kern/kern_timeout.c:788 softintr_dispatch(0) at softintr_dispatch+0xf9 sys/kern/kern_softintr.c:87 dosoftint(0) at dosoftint+0x48 sys/arch/amd64/amd64/intr.c:862 Xsoftclock() at Xsoftclock+0x27 writedisklabel(d02,ffffffff8238cd00,ffff800000039000) at writedisklabel+0x1b8 sys/arch/amd64/amd64/disksubr.c:158 sdioctl(d01,84946467,ffff8000015bd000,3,ffff80003bcf1248) at sdioctl+0x959 sys/scsi/sd.c:919 VOP_IOCTL(fffffd806bd9ca30,84946467,ffff8000015bd000,3,fffffd8007ffd6e8,ffff80003bcf1248) at VOP_IOCTL+0xa3 sys/kern/vfs_vops.c:264 vn_ioctl(fffffd800af74628,84946467,ffff8000015bd000,ffff80003bcf1248) at vn_ioctl+0xea sys/kern/vfs_vnops.c:537 sys_ioctl(ffff80003bcf1248,ffff80003bcf71c0,ffff80003bcf7110) at sys_ioctl+0x660 sys/kern/sys_generic.c:-1 syscall(ffff80003bcf71c0) at syscall+0x962 mi_syscall sys/sys/syscall_mi.h:-1 [inline] syscall(ffff80003bcf71c0) at syscall+0x962 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x46d6f894df0, count: -14 ddb> show registers rdi 0xffffffff rsi 0xffff800000c16c00 rbp 0xffff80003bcf6b30 rbx 0xffff80003c970020 rdx 0xffff80003bcf1248 rcx 0xffff800029ee6000 rax 0xfffffd806cac7de0 r8 0xffff80003bcf6cb8 r9 0 r10 0x648c084073085f53 r11 0x8c72ef4dc06e271e r12 0xffffffff82fc77f0 endtsleep r13 0xffff80003bcf1778 r14 0xffff80003c970020 r15 0 rip 0xffffffff814822f2 kcov_remote_enter+0x122 cs 0x8 rflags 0x10297 __ALIGN_SIZE+0xf297 rsp 0xffff80003bcf6b10 ss 0x10 kcov_remote_enter+0x122: movq $0,0(%rcx) ddb> show proc PROC (syz-executor) tid=265333 pid=37169 tcnt=3 stat=onproc flags process=0 proc=4000000 runpri=82, usrpri=82, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff80003bcf0fb0,0xffff80003bcf0030 process=0xffff80002a79ed10 user=0xffff80003bcf2000, vmspace=0xfffffd806f97ae68 estcpu=32, cpticks=1, pctcpu=0.0, user=0, sys=0, intr=1 ddb> ps PID TID PPID UID S FLAGS WAIT COMMAND 46189 118208 58924 0 2 0x100002 sh 47640 408078 20735 0 2 0 syz-executor 2397 232844 75989 0 2 0 syz-executor 2397 232951 75989 0 2 0x4000000 syz-executor 48194 220188 19926 0 2 0x2 syz-executor 58924 11417 19926 0 3 0x82 wait syz-executor 37169 81953 5475 0 2 0 syz-executor *37169 265333 5475 0 7 0x4000000 syz-executor 37169 201409 5475 0 3 0x4000080 fsleep syz-executor 77933 60316 17282 0 2 0 syz-executor 77933 88525 17282 0 2 0x4000000 syz-executor 77933 236727 17282 0 3 0x4000000 inode syz-executor 34033 445470 51609 0 2 0 syz-executor 34033 17524 51609 0 3 0x4000080 fsleep syz-executor 34033 357230 51609 0 3 0x4000080 fsleep syz-executor 34033 32022 51609 0 3 0x4000080 fsleep syz-executor 69395 374223 1 0 3 0x80 nanoslp init 51609 75407 19926 0 3 0x82 nanoslp syz-executor 17282 414380 19926 0 3 0x82 nanoslp syz-executor 1824 209097 0 0 3 0x14280 nfsidl nfsio 9211 398314 0 0 3 0x14280 nfsidl nfsio 88632 349645 0 0 3 0x14280 nfsidl nfsio 24542 514624 0 0 3 0x14280 nfsidl nfsio 34544 142622 0 0 3 0x14280 nfsidl nfsio 37189 288731 0 0 3 0x14280 nfsidl nfsio 17867 487566 0 0 3 0x14280 nfsidl nfsio 47926 384679 0 0 3 0x14280 nfsidl nfsio 39583 99676 0 0 3 0x14280 nfsidl nfsio 39227 179805 0 0 3 0x14280 nfsidl nfsio 79784 337675 0 0 3 0x14280 nfsidl nfsio 37893 508291 0 0 3 0x14280 nfsidl nfsio 79682 129565 0 0 3 0x14280 nfsidl nfsio 75061 30282 0 0 3 0x14280 nfsidl nfsio 73504 198017 0 0 3 0x14280 nfsidl nfsio 56347 74896 0 0 3 0x14280 nfsidl nfsio 64964 281864 0 0 3 0x14280 nfsidl nfsio 71023 334911 0 0 3 0x14280 nfsidl nfsio 97262 388863 0 0 3 0x14280 nfsidl nfsio 97636 320957 0 0 3 0x14280 nfsidl nfsio 20735 7523 19926 0 3 0x82 nanoslp syz-executor 11300 398291 19926 0 3 0x82 wait