panic: kernel diagnostic assertion "kd_lookup(kd->kd_unit) == NULL" failed: file "/syzkaller/managers/main/kernel/sys/dev/kcov.c", line 311
Starting stack trace...
panic(ffffffff830b682f) at panic+0x1ba sys/kern/subr_prf.c:229
__assert(ffffffff8306b53c,ffffffff830021d7,137,ffffffff8304f8bf) at __assert+0x29
kcovopen(113d4,1,2000,ffff800036011478) at kcovopen+0x14f kd_lookup sys/dev/kcov.c:483 [inline]
kcovopen(113d4,1,2000,ffff800036011478) at kcovopen+0x14f sys/dev/kcov.c:311
spec_open_clone(ffff80002a4eb558) at spec_open_clone+0x287 sys/kern/spec_vnops.c:722
spec_open(ffff80002a4eb558) at spec_open+0x326 sys/kern/spec_vnops.c:148
VOP_OPEN(fffffd806fc90298,1,fffffd807f7d7888,ffff800036011478) at VOP_OPEN+0x82 sys/kern/vfs_vops.c:138
vn_open(ffff80002a4eb7a8,1,0) at vn_open+0x708 sys/kern/vfs_vnops.c:177
doopenat(ffff800036011478,ffffff9c,20000080,0,0,ffff80002a4eb950) at doopenat+0x31d sys/kern/vfs_syscalls.c:1123
syscall(ffff80002a4eba00) at syscall+0x97e sys/arch/amd64/amd64/trap.c:577
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x520195ce20, count: 247
End of stack trace.